feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

1 files changed, 2199 insertions, 0 deletions

diff --git a/vanilla/node_modules/@vitest/utils/dist/diff.js b/vanilla/node_modules/@vitest/utils/dist/diff.js
new file mode 100644
index 0000000..415a4f1
--- /dev/null
+++ b/vanilla/node_modules/@vitest/utils/dist/diff.js
@@ -0,0 +1,2199 @@
+import { plugins, format } from '@vitest/pretty-format';
+import c from 'tinyrainbow';
+import { stringify } from './display.js';
+import { deepClone, getOwnProperties, getType as getType$1 } from './helpers.js';
+import { g as getDefaultExportFromCjs } from './chunk-_commonjsHelpers.js';
+import './constants.js';
+
+/**
+* Diff Match and Patch
+* Copyright 2018 The diff-match-patch Authors.
+* https://github.com/google/diff-match-patch
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*   http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+/**
+* @fileoverview Computes the difference between two texts to create a patch.
+* Applies the patch onto another text, allowing for errors.
+* @author fraser@google.com (Neil Fraser)
+*/
+/**
+* CHANGES by pedrottimark to diff_match_patch_uncompressed.ts file:
+*
+* 1. Delete anything not needed to use diff_cleanupSemantic method
+* 2. Convert from prototype properties to var declarations
+* 3. Convert Diff to class from constructor and prototype
+* 4. Add type annotations for arguments and return values
+* 5. Add exports
+*/
+/**
+* The data structure representing a diff is an array of tuples:
+* [[DIFF_DELETE, 'Hello'], [DIFF_INSERT, 'Goodbye'], [DIFF_EQUAL, ' world.']]
+* which means: delete 'Hello', add 'Goodbye' and keep ' world.'
+*/
+const DIFF_DELETE = -1;
+const DIFF_INSERT = 1;
+const DIFF_EQUAL = 0;
+/**
+* Class representing one diff tuple.
+* Attempts to look like a two-element array (which is what this used to be).
+* @param {number} op Operation, one of: DIFF_DELETE, DIFF_INSERT, DIFF_EQUAL.
+* @param {string} text Text to be deleted, inserted, or retained.
+* @constructor
+*/
+class Diff {
+	0;
+	1;
+	constructor(op, text) {
+		this[0] = op;
+		this[1] = text;
+	}
+}
+/**
+* Determine the common prefix of two strings.
+* @param {string} text1 First string.
+* @param {string} text2 Second string.
+* @return {number} The number of characters common to the start of each
+*     string.
+*/
+function diff_commonPrefix(text1, text2) {
+	// Quick check for common null cases.
+	if (!text1 || !text2 || text1.charAt(0) !== text2.charAt(0)) {
+		return 0;
+	}
+	// Binary search.
+	// Performance analysis: https://neil.fraser.name/news/2007/10/09/
+	let pointermin = 0;
+	let pointermax = Math.min(text1.length, text2.length);
+	let pointermid = pointermax;
+	let pointerstart = 0;
+	while (pointermin < pointermid) {
+		if (text1.substring(pointerstart, pointermid) === text2.substring(pointerstart, pointermid)) {
+			pointermin = pointermid;
+			pointerstart = pointermin;
+		} else {
+			pointermax = pointermid;
+		}
+		pointermid = Math.floor((pointermax - pointermin) / 2 + pointermin);
+	}
+	return pointermid;
+}
+/**
+* Determine the common suffix of two strings.
+* @param {string} text1 First string.
+* @param {string} text2 Second string.
+* @return {number} The number of characters common to the end of each string.
+*/
+function diff_commonSuffix(text1, text2) {
+	// Quick check for common null cases.
+	if (!text1 || !text2 || text1.charAt(text1.length - 1) !== text2.charAt(text2.length - 1)) {
+		return 0;
+	}
+	// Binary search.
+	// Performance analysis: https://neil.fraser.name/news/2007/10/09/
+	let pointermin = 0;
+	let pointermax = Math.min(text1.length, text2.length);
+	let pointermid = pointermax;
+	let pointerend = 0;
+	while (pointermin < pointermid) {
+		if (text1.substring(text1.length - pointermid, text1.length - pointerend) === text2.substring(text2.length - pointermid, text2.length - pointerend)) {
+			pointermin = pointermid;
+			pointerend = pointermin;
+		} else {
+			pointermax = pointermid;
+		}
+		pointermid = Math.floor((pointermax - pointermin) / 2 + pointermin);
+	}
+	return pointermid;
+}
+/**
+* Determine if the suffix of one string is the prefix of another.
+* @param {string} text1 First string.
+* @param {string} text2 Second string.
+* @return {number} The number of characters common to the end of the first
+*     string and the start of the second string.
+* @private
+*/
+function diff_commonOverlap_(text1, text2) {
+	// Cache the text lengths to prevent multiple calls.
+	const text1_length = text1.length;
+	const text2_length = text2.length;
+	// Eliminate the null case.
+	if (text1_length === 0 || text2_length === 0) {
+		return 0;
+	}
+	// Truncate the longer string.
+	if (text1_length > text2_length) {
+		text1 = text1.substring(text1_length - text2_length);
+	} else if (text1_length < text2_length) {
+		text2 = text2.substring(0, text1_length);
+	}
+	const text_length = Math.min(text1_length, text2_length);
+	// Quick check for the worst case.
+	if (text1 === text2) {
+		return text_length;
+	}
+	// Start by looking for a single character match
+	// and increase length until no match is found.
+	// Performance analysis: https://neil.fraser.name/news/2010/11/04/
+	let best = 0;
+	let length = 1;
+	while (true) {
+		const pattern = text1.substring(text_length - length);
+		const found = text2.indexOf(pattern);
+		if (found === -1) {
+			return best;
+		}
+		length += found;
+		if (found === 0 || text1.substring(text_length - length) === text2.substring(0, length)) {
+			best = length;
+			length++;
+		}
+	}
+}
+/**
+* Reduce the number of edits by eliminating semantically trivial equalities.
+* @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
+*/
+function diff_cleanupSemantic(diffs) {
+	let changes = false;
+	const equalities = [];
+	let equalitiesLength = 0;
+	/** @type {?string} */
+	let lastEquality = null;
+	// Always equal to diffs[equalities[equalitiesLength - 1]][1]
+	let pointer = 0;
+	// Number of characters that changed prior to the equality.
+	let length_insertions1 = 0;
+	let length_deletions1 = 0;
+	// Number of characters that changed after the equality.
+	let length_insertions2 = 0;
+	let length_deletions2 = 0;
+	while (pointer < diffs.length) {
+		if (diffs[pointer][0] === DIFF_EQUAL) {
+			// Equality found.
+			equalities[equalitiesLength++] = pointer;
+			length_insertions1 = length_insertions2;
+			length_deletions1 = length_deletions2;
+			length_insertions2 = 0;
+			length_deletions2 = 0;
+			lastEquality = diffs[pointer][1];
+		} else {
+			// An insertion or deletion.
+			if (diffs[pointer][0] === DIFF_INSERT) {
+				length_insertions2 += diffs[pointer][1].length;
+			} else {
+				length_deletions2 += diffs[pointer][1].length;
+			}
+			// Eliminate an equality that is smaller or equal to the edits on both
+			// sides of it.
+			if (lastEquality && lastEquality.length <= Math.max(length_insertions1, length_deletions1) && lastEquality.length <= Math.max(length_insertions2, length_deletions2)) {
+				// Duplicate record.
+				diffs.splice(equalities[equalitiesLength - 1], 0, new Diff(DIFF_DELETE, lastEquality));
+				// Change second copy to insert.
+				diffs[equalities[equalitiesLength - 1] + 1][0] = DIFF_INSERT;
+				// Throw away the equality we just deleted.
+				equalitiesLength--;
+				// Throw away the previous equality (it needs to be reevaluated).
+				equalitiesLength--;
+				pointer = equalitiesLength > 0 ? equalities[equalitiesLength - 1] : -1;
+				length_insertions1 = 0;
+				length_deletions1 = 0;
+				length_insertions2 = 0;
+				length_deletions2 = 0;
+				lastEquality = null;
+				changes = true;
+			}
+		}
+		pointer++;
+	}
+	// Normalize the diff.
+	if (changes) {
+		diff_cleanupMerge(diffs);
+	}
+	diff_cleanupSemanticLossless(diffs);
+	// Find any overlaps between deletions and insertions.
+	// e.g: <del>abcxxx</del><ins>xxxdef</ins>
+	//   -> <del>abc</del>xxx<ins>def</ins>
+	// e.g: <del>xxxabc</del><ins>defxxx</ins>
+	//   -> <ins>def</ins>xxx<del>abc</del>
+	// Only extract an overlap if it is as big as the edit ahead or behind it.
+	pointer = 1;
+	while (pointer < diffs.length) {
+		if (diffs[pointer - 1][0] === DIFF_DELETE && diffs[pointer][0] === DIFF_INSERT) {
+			const deletion = diffs[pointer - 1][1];
+			const insertion = diffs[pointer][1];
+			const overlap_length1 = diff_commonOverlap_(deletion, insertion);
+			const overlap_length2 = diff_commonOverlap_(insertion, deletion);
+			if (overlap_length1 >= overlap_length2) {
+				if (overlap_length1 >= deletion.length / 2 || overlap_length1 >= insertion.length / 2) {
+					// Overlap found.  Insert an equality and trim the surrounding edits.
+					diffs.splice(pointer, 0, new Diff(DIFF_EQUAL, insertion.substring(0, overlap_length1)));
+					diffs[pointer - 1][1] = deletion.substring(0, deletion.length - overlap_length1);
+					diffs[pointer + 1][1] = insertion.substring(overlap_length1);
+					pointer++;
+				}
+			} else {
+				if (overlap_length2 >= deletion.length / 2 || overlap_length2 >= insertion.length / 2) {
+					// Reverse overlap found.
+					// Insert an equality and swap and trim the surrounding edits.
+					diffs.splice(pointer, 0, new Diff(DIFF_EQUAL, deletion.substring(0, overlap_length2)));
+					diffs[pointer - 1][0] = DIFF_INSERT;
+					diffs[pointer - 1][1] = insertion.substring(0, insertion.length - overlap_length2);
+					diffs[pointer + 1][0] = DIFF_DELETE;
+					diffs[pointer + 1][1] = deletion.substring(overlap_length2);
+					pointer++;
+				}
+			}
+			pointer++;
+		}
+		pointer++;
+	}
+}
+// Define some regex patterns for matching boundaries.
+const nonAlphaNumericRegex_ = /[^a-z0-9]/i;
+const whitespaceRegex_ = /\s/;
+const linebreakRegex_ = /[\r\n]/;
+const blanklineEndRegex_ = /\n\r?\n$/;
+const blanklineStartRegex_ = /^\r?\n\r?\n/;
+/**
+* Look for single edits surrounded on both sides by equalities
+* which can be shifted sideways to align the edit to a word boundary.
+* e.g: The c<ins>at c</ins>ame. -> The <ins>cat </ins>came.
+* @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
+*/
+function diff_cleanupSemanticLossless(diffs) {
+	let pointer = 1;
+	// Intentionally ignore the first and last element (don't need checking).
+	while (pointer < diffs.length - 1) {
+		if (diffs[pointer - 1][0] === DIFF_EQUAL && diffs[pointer + 1][0] === DIFF_EQUAL) {
+			// This is a single edit surrounded by equalities.
+			let equality1 = diffs[pointer - 1][1];
+			let edit = diffs[pointer][1];
+			let equality2 = diffs[pointer + 1][1];
+			// First, shift the edit as far left as possible.
+			const commonOffset = diff_commonSuffix(equality1, edit);
+			if (commonOffset) {
+				const commonString = edit.substring(edit.length - commonOffset);
+				equality1 = equality1.substring(0, equality1.length - commonOffset);
+				edit = commonString + edit.substring(0, edit.length - commonOffset);
+				equality2 = commonString + equality2;
+			}
+			// Second, step character by character right, looking for the best fit.
+			let bestEquality1 = equality1;
+			let bestEdit = edit;
+			let bestEquality2 = equality2;
+			let bestScore = diff_cleanupSemanticScore_(equality1, edit) + diff_cleanupSemanticScore_(edit, equality2);
+			while (edit.charAt(0) === equality2.charAt(0)) {
+				equality1 += edit.charAt(0);
+				edit = edit.substring(1) + equality2.charAt(0);
+				equality2 = equality2.substring(1);
+				const score = diff_cleanupSemanticScore_(equality1, edit) + diff_cleanupSemanticScore_(edit, equality2);
+				// The >= encourages trailing rather than leading whitespace on edits.
+				if (score >= bestScore) {
+					bestScore = score;
+					bestEquality1 = equality1;
+					bestEdit = edit;
+					bestEquality2 = equality2;
+				}
+			}
+			if (diffs[pointer - 1][1] !== bestEquality1) {
+				// We have an improvement, save it back to the diff.
+				if (bestEquality1) {
+					diffs[pointer - 1][1] = bestEquality1;
+				} else {
+					diffs.splice(pointer - 1, 1);
+					pointer--;
+				}
+				diffs[pointer][1] = bestEdit;
+				if (bestEquality2) {
+					diffs[pointer + 1][1] = bestEquality2;
+				} else {
+					diffs.splice(pointer + 1, 1);
+					pointer--;
+				}
+			}
+		}
+		pointer++;
+	}
+}
+/**
+* Reorder and merge like edit sections.  Merge equalities.
+* Any edit section can move as long as it doesn't cross an equality.
+* @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
+*/
+function diff_cleanupMerge(diffs) {
+	var _diffs$at;
+	// Add a dummy entry at the end.
+	diffs.push(new Diff(DIFF_EQUAL, ""));
+	let pointer = 0;
+	let count_delete = 0;
+	let count_insert = 0;
+	let text_delete = "";
+	let text_insert = "";
+	let commonlength;
+	while (pointer < diffs.length) {
+		switch (diffs[pointer][0]) {
+			case DIFF_INSERT:
+				count_insert++;
+				text_insert += diffs[pointer][1];
+				pointer++;
+				break;
+			case DIFF_DELETE:
+				count_delete++;
+				text_delete += diffs[pointer][1];
+				pointer++;
+				break;
+			case DIFF_EQUAL:
+				// Upon reaching an equality, check for prior redundancies.
+				if (count_delete + count_insert > 1) {
+					if (count_delete !== 0 && count_insert !== 0) {
+						// Factor out any common prefixes.
+						commonlength = diff_commonPrefix(text_insert, text_delete);
+						if (commonlength !== 0) {
+							if (pointer - count_delete - count_insert > 0 && diffs[pointer - count_delete - count_insert - 1][0] === DIFF_EQUAL) {
+								diffs[pointer - count_delete - count_insert - 1][1] += text_insert.substring(0, commonlength);
+							} else {
+								diffs.splice(0, 0, new Diff(DIFF_EQUAL, text_insert.substring(0, commonlength)));
+								pointer++;
+							}
+							text_insert = text_insert.substring(commonlength);
+							text_delete = text_delete.substring(commonlength);
+						}
+						// Factor out any common suffixes.
+						commonlength = diff_commonSuffix(text_insert, text_delete);
+						if (commonlength !== 0) {
+							diffs[pointer][1] = text_insert.substring(text_insert.length - commonlength) + diffs[pointer][1];
+							text_insert = text_insert.substring(0, text_insert.length - commonlength);
+							text_delete = text_delete.substring(0, text_delete.length - commonlength);
+						}
+					}
+					// Delete the offending records and add the merged ones.
+					pointer -= count_delete + count_insert;
+					diffs.splice(pointer, count_delete + count_insert);
+					if (text_delete.length) {
+						diffs.splice(pointer, 0, new Diff(DIFF_DELETE, text_delete));
+						pointer++;
+					}
+					if (text_insert.length) {
+						diffs.splice(pointer, 0, new Diff(DIFF_INSERT, text_insert));
+						pointer++;
+					}
+					pointer++;
+				} else if (pointer !== 0 && diffs[pointer - 1][0] === DIFF_EQUAL) {
+					// Merge this equality with the previous one.
+					diffs[pointer - 1][1] += diffs[pointer][1];
+					diffs.splice(pointer, 1);
+				} else {
+					pointer++;
+				}
+				count_insert = 0;
+				count_delete = 0;
+				text_delete = "";
+				text_insert = "";
+				break;
+		}
+	}
+	if (((_diffs$at = diffs.at(-1)) === null || _diffs$at === void 0 ? void 0 : _diffs$at[1]) === "") {
+		diffs.pop();
+	}
+	// Second pass: look for single edits surrounded on both sides by equalities
+	// which can be shifted sideways to eliminate an equality.
+	// e.g: A<ins>BA</ins>C -> <ins>AB</ins>AC
+	let changes = false;
+	pointer = 1;
+	// Intentionally ignore the first and last element (don't need checking).
+	while (pointer < diffs.length - 1) {
+		if (diffs[pointer - 1][0] === DIFF_EQUAL && diffs[pointer + 1][0] === DIFF_EQUAL) {
+			// This is a single edit surrounded by equalities.
+			if (diffs[pointer][1].substring(diffs[pointer][1].length - diffs[pointer - 1][1].length) === diffs[pointer - 1][1]) {
+				// Shift the edit over the previous equality.
+				diffs[pointer][1] = diffs[pointer - 1][1] + diffs[pointer][1].substring(0, diffs[pointer][1].length - diffs[pointer - 1][1].length);
+				diffs[pointer + 1][1] = diffs[pointer - 1][1] + diffs[pointer + 1][1];
+				diffs.splice(pointer - 1, 1);
+				changes = true;
+			} else if (diffs[pointer][1].substring(0, diffs[pointer + 1][1].length) === diffs[pointer + 1][1]) {
+				// Shift the edit over the next equality.
+				diffs[pointer - 1][1] += diffs[pointer + 1][1];
+				diffs[pointer][1] = diffs[pointer][1].substring(diffs[pointer + 1][1].length) + diffs[pointer + 1][1];
+				diffs.splice(pointer + 1, 1);
+				changes = true;
+			}
+		}
+		pointer++;
+	}
+	// If shifts were made, the diff needs reordering and another shift sweep.
+	if (changes) {
+		diff_cleanupMerge(diffs);
+	}
+}
+/**
+* Given two strings, compute a score representing whether the internal
+* boundary falls on logical boundaries.
+* Scores range from 6 (best) to 0 (worst).
+* Closure, but does not reference any external variables.
+* @param {string} one First string.
+* @param {string} two Second string.
+* @return {number} The score.
+* @private
+*/
+function diff_cleanupSemanticScore_(one, two) {
+	if (!one || !two) {
+		// Edges are the best.
+		return 6;
+	}
+	// Each port of this function behaves slightly differently due to
+	// subtle differences in each language's definition of things like
+	// 'whitespace'.  Since this function's purpose is largely cosmetic,
+	// the choice has been made to use each language's native features
+	// rather than force total conformity.
+	const char1 = one.charAt(one.length - 1);
+	const char2 = two.charAt(0);
+	const nonAlphaNumeric1 = char1.match(nonAlphaNumericRegex_);
+	const nonAlphaNumeric2 = char2.match(nonAlphaNumericRegex_);
+	const whitespace1 = nonAlphaNumeric1 && char1.match(whitespaceRegex_);
+	const whitespace2 = nonAlphaNumeric2 && char2.match(whitespaceRegex_);
+	const lineBreak1 = whitespace1 && char1.match(linebreakRegex_);
+	const lineBreak2 = whitespace2 && char2.match(linebreakRegex_);
+	const blankLine1 = lineBreak1 && one.match(blanklineEndRegex_);
+	const blankLine2 = lineBreak2 && two.match(blanklineStartRegex_);
+	if (blankLine1 || blankLine2) {
+		// Five points for blank lines.
+		return 5;
+	} else if (lineBreak1 || lineBreak2) {
+		// Four points for line breaks.
+		return 4;
+	} else if (nonAlphaNumeric1 && !whitespace1 && whitespace2) {
+		// Three points for end of sentences.
+		return 3;
+	} else if (whitespace1 || whitespace2) {
+		// Two points for whitespace.
+		return 2;
+	} else if (nonAlphaNumeric1 || nonAlphaNumeric2) {
+		// One point for non-alphanumeric.
+		return 1;
+	}
+	return 0;
+}
+
+/**
+* Copyright (c) Meta Platforms, Inc. and affiliates.
+*
+* This source code is licensed under the MIT license found in the
+* LICENSE file in the root directory of this source tree.
+*/
+const NO_DIFF_MESSAGE = "Compared values have no visual difference.";
+const SIMILAR_MESSAGE = "Compared values serialize to the same structure.\n" + "Printing internal object structure without calling `toJSON` instead.";
+
+var build = {};
+
+var hasRequiredBuild;
+
+function requireBuild () {
+	if (hasRequiredBuild) return build;
+	hasRequiredBuild = 1;
+
+	Object.defineProperty(build, '__esModule', {
+	  value: true
+	});
+	build.default = diffSequence;
+	/**
+	 * Copyright (c) Meta Platforms, Inc. and affiliates.
+	 *
+	 * This source code is licensed under the MIT license found in the
+	 * LICENSE file in the root directory of this source tree.
+	 *
+	 */
+
+	// This diff-sequences package implements the linear space variation in
+	// An O(ND) Difference Algorithm and Its Variations by Eugene W. Myers
+
+	// Relationship in notation between Myers paper and this package:
+	// A is a
+	// N is aLength, aEnd - aStart, and so on
+	// x is aIndex, aFirst, aLast, and so on
+	// B is b
+	// M is bLength, bEnd - bStart, and so on
+	// y is bIndex, bFirst, bLast, and so on
+	// Δ = N - M is negative of baDeltaLength = bLength - aLength
+	// D is d
+	// k is kF
+	// k + Δ is kF = kR - baDeltaLength
+	// V is aIndexesF or aIndexesR (see comment below about Indexes type)
+	// index intervals [1, N] and [1, M] are [0, aLength) and [0, bLength)
+	// starting point in forward direction (0, 0) is (-1, -1)
+	// starting point in reverse direction (N + 1, M + 1) is (aLength, bLength)
+
+	// The “edit graph” for sequences a and b corresponds to items:
+	// in a on the horizontal axis
+	// in b on the vertical axis
+	//
+	// Given a-coordinate of a point in a diagonal, you can compute b-coordinate.
+	//
+	// Forward diagonals kF:
+	// zero diagonal intersects top left corner
+	// positive diagonals intersect top edge
+	// negative diagonals insersect left edge
+	//
+	// Reverse diagonals kR:
+	// zero diagonal intersects bottom right corner
+	// positive diagonals intersect right edge
+	// negative diagonals intersect bottom edge
+
+	// The graph contains a directed acyclic graph of edges:
+	// horizontal: delete an item from a
+	// vertical: insert an item from b
+	// diagonal: common item in a and b
+	//
+	// The algorithm solves dual problems in the graph analogy:
+	// Find longest common subsequence: path with maximum number of diagonal edges
+	// Find shortest edit script: path with minimum number of non-diagonal edges
+
+	// Input callback function compares items at indexes in the sequences.
+
+	// Output callback function receives the number of adjacent items
+	// and starting indexes of each common subsequence.
+	// Either original functions or wrapped to swap indexes if graph is transposed.
+	// Indexes in sequence a of last point of forward or reverse paths in graph.
+	// Myers algorithm indexes by diagonal k which for negative is bad deopt in V8.
+	// This package indexes by iF and iR which are greater than or equal to zero.
+	// and also updates the index arrays in place to cut memory in half.
+	// kF = 2 * iF - d
+	// kR = d - 2 * iR
+	// Division of index intervals in sequences a and b at the middle change.
+	// Invariant: intervals do not have common items at the start or end.
+	const pkg = 'diff-sequences'; // for error messages
+	const NOT_YET_SET = 0; // small int instead of undefined to avoid deopt in V8
+
+	// Return the number of common items that follow in forward direction.
+	// The length of what Myers paper calls a “snake” in a forward path.
+	const countCommonItemsF = (aIndex, aEnd, bIndex, bEnd, isCommon) => {
+	  let nCommon = 0;
+	  while (aIndex < aEnd && bIndex < bEnd && isCommon(aIndex, bIndex)) {
+	    aIndex += 1;
+	    bIndex += 1;
+	    nCommon += 1;
+	  }
+	  return nCommon;
+	};
+
+	// Return the number of common items that precede in reverse direction.
+	// The length of what Myers paper calls a “snake” in a reverse path.
+	const countCommonItemsR = (aStart, aIndex, bStart, bIndex, isCommon) => {
+	  let nCommon = 0;
+	  while (aStart <= aIndex && bStart <= bIndex && isCommon(aIndex, bIndex)) {
+	    aIndex -= 1;
+	    bIndex -= 1;
+	    nCommon += 1;
+	  }
+	  return nCommon;
+	};
+
+	// A simple function to extend forward paths from (d - 1) to d changes
+	// when forward and reverse paths cannot yet overlap.
+	const extendPathsF = (
+	  d,
+	  aEnd,
+	  bEnd,
+	  bF,
+	  isCommon,
+	  aIndexesF,
+	  iMaxF // return the value because optimization might decrease it
+	) => {
+	  // Unroll the first iteration.
+	  let iF = 0;
+	  let kF = -d; // kF = 2 * iF - d
+	  let aFirst = aIndexesF[iF]; // in first iteration always insert
+	  let aIndexPrev1 = aFirst; // prev value of [iF - 1] in next iteration
+	  aIndexesF[iF] += countCommonItemsF(
+	    aFirst + 1,
+	    aEnd,
+	    bF + aFirst - kF + 1,
+	    bEnd,
+	    isCommon
+	  );
+
+	  // Optimization: skip diagonals in which paths cannot ever overlap.
+	  const nF = d < iMaxF ? d : iMaxF;
+
+	  // The diagonals kF are odd when d is odd and even when d is even.
+	  for (iF += 1, kF += 2; iF <= nF; iF += 1, kF += 2) {
+	    // To get first point of path segment, move one change in forward direction
+	    // from last point of previous path segment in an adjacent diagonal.
+	    // In last possible iteration when iF === d and kF === d always delete.
+	    if (iF !== d && aIndexPrev1 < aIndexesF[iF]) {
+	      aFirst = aIndexesF[iF]; // vertical to insert from b
+	    } else {
+	      aFirst = aIndexPrev1 + 1; // horizontal to delete from a
+
+	      if (aEnd <= aFirst) {
+	        // Optimization: delete moved past right of graph.
+	        return iF - 1;
+	      }
+	    }
+
+	    // To get last point of path segment, move along diagonal of common items.
+	    aIndexPrev1 = aIndexesF[iF];
+	    aIndexesF[iF] =
+	      aFirst +
+	      countCommonItemsF(aFirst + 1, aEnd, bF + aFirst - kF + 1, bEnd, isCommon);
+	  }
+	  return iMaxF;
+	};
+
+	// A simple function to extend reverse paths from (d - 1) to d changes
+	// when reverse and forward paths cannot yet overlap.
+	const extendPathsR = (
+	  d,
+	  aStart,
+	  bStart,
+	  bR,
+	  isCommon,
+	  aIndexesR,
+	  iMaxR // return the value because optimization might decrease it
+	) => {
+	  // Unroll the first iteration.
+	  let iR = 0;
+	  let kR = d; // kR = d - 2 * iR
+	  let aFirst = aIndexesR[iR]; // in first iteration always insert
+	  let aIndexPrev1 = aFirst; // prev value of [iR - 1] in next iteration
+	  aIndexesR[iR] -= countCommonItemsR(
+	    aStart,
+	    aFirst - 1,
+	    bStart,
+	    bR + aFirst - kR - 1,
+	    isCommon
+	  );
+
+	  // Optimization: skip diagonals in which paths cannot ever overlap.
+	  const nR = d < iMaxR ? d : iMaxR;
+
+	  // The diagonals kR are odd when d is odd and even when d is even.
+	  for (iR += 1, kR -= 2; iR <= nR; iR += 1, kR -= 2) {
+	    // To get first point of path segment, move one change in reverse direction
+	    // from last point of previous path segment in an adjacent diagonal.
+	    // In last possible iteration when iR === d and kR === -d always delete.
+	    if (iR !== d && aIndexesR[iR] < aIndexPrev1) {
+	      aFirst = aIndexesR[iR]; // vertical to insert from b
+	    } else {
+	      aFirst = aIndexPrev1 - 1; // horizontal to delete from a
+
+	      if (aFirst < aStart) {
+	        // Optimization: delete moved past left of graph.
+	        return iR - 1;
+	      }
+	    }
+
+	    // To get last point of path segment, move along diagonal of common items.
+	    aIndexPrev1 = aIndexesR[iR];
+	    aIndexesR[iR] =
+	      aFirst -
+	      countCommonItemsR(
+	        aStart,
+	        aFirst - 1,
+	        bStart,
+	        bR + aFirst - kR - 1,
+	        isCommon
+	      );
+	  }
+	  return iMaxR;
+	};
+
+	// A complete function to extend forward paths from (d - 1) to d changes.
+	// Return true if a path overlaps reverse path of (d - 1) changes in its diagonal.
+	const extendOverlappablePathsF = (
+	  d,
+	  aStart,
+	  aEnd,
+	  bStart,
+	  bEnd,
+	  isCommon,
+	  aIndexesF,
+	  iMaxF,
+	  aIndexesR,
+	  iMaxR,
+	  division // update prop values if return true
+	) => {
+	  const bF = bStart - aStart; // bIndex = bF + aIndex - kF
+	  const aLength = aEnd - aStart;
+	  const bLength = bEnd - bStart;
+	  const baDeltaLength = bLength - aLength; // kF = kR - baDeltaLength
+
+	  // Range of diagonals in which forward and reverse paths might overlap.
+	  const kMinOverlapF = -baDeltaLength - (d - 1); // -(d - 1) <= kR
+	  const kMaxOverlapF = -baDeltaLength + (d - 1); // kR <= (d - 1)
+
+	  let aIndexPrev1 = NOT_YET_SET; // prev value of [iF - 1] in next iteration
+
+	  // Optimization: skip diagonals in which paths cannot ever overlap.
+	  const nF = d < iMaxF ? d : iMaxF;
+
+	  // The diagonals kF = 2 * iF - d are odd when d is odd and even when d is even.
+	  for (let iF = 0, kF = -d; iF <= nF; iF += 1, kF += 2) {
+	    // To get first point of path segment, move one change in forward direction
+	    // from last point of previous path segment in an adjacent diagonal.
+	    // In first iteration when iF === 0 and kF === -d always insert.
+	    // In last possible iteration when iF === d and kF === d always delete.
+	    const insert = iF === 0 || (iF !== d && aIndexPrev1 < aIndexesF[iF]);
+	    const aLastPrev = insert ? aIndexesF[iF] : aIndexPrev1;
+	    const aFirst = insert
+	      ? aLastPrev // vertical to insert from b
+	      : aLastPrev + 1; // horizontal to delete from a
+
+	    // To get last point of path segment, move along diagonal of common items.
+	    const bFirst = bF + aFirst - kF;
+	    const nCommonF = countCommonItemsF(
+	      aFirst + 1,
+	      aEnd,
+	      bFirst + 1,
+	      bEnd,
+	      isCommon
+	    );
+	    const aLast = aFirst + nCommonF;
+	    aIndexPrev1 = aIndexesF[iF];
+	    aIndexesF[iF] = aLast;
+	    if (kMinOverlapF <= kF && kF <= kMaxOverlapF) {
+	      // Solve for iR of reverse path with (d - 1) changes in diagonal kF:
+	      // kR = kF + baDeltaLength
+	      // kR = (d - 1) - 2 * iR
+	      const iR = (d - 1 - (kF + baDeltaLength)) / 2;
+
+	      // If this forward path overlaps the reverse path in this diagonal,
+	      // then this is the middle change of the index intervals.
+	      if (iR <= iMaxR && aIndexesR[iR] - 1 <= aLast) {
+	        // Unlike the Myers algorithm which finds only the middle “snake”
+	        // this package can find two common subsequences per division.
+	        // Last point of previous path segment is on an adjacent diagonal.
+	        const bLastPrev = bF + aLastPrev - (insert ? kF + 1 : kF - 1);
+
+	        // Because of invariant that intervals preceding the middle change
+	        // cannot have common items at the end,
+	        // move in reverse direction along a diagonal of common items.
+	        const nCommonR = countCommonItemsR(
+	          aStart,
+	          aLastPrev,
+	          bStart,
+	          bLastPrev,
+	          isCommon
+	        );
+	        const aIndexPrevFirst = aLastPrev - nCommonR;
+	        const bIndexPrevFirst = bLastPrev - nCommonR;
+	        const aEndPreceding = aIndexPrevFirst + 1;
+	        const bEndPreceding = bIndexPrevFirst + 1;
+	        division.nChangePreceding = d - 1;
+	        if (d - 1 === aEndPreceding + bEndPreceding - aStart - bStart) {
+	          // Optimization: number of preceding changes in forward direction
+	          // is equal to number of items in preceding interval,
+	          // therefore it cannot contain any common items.
+	          division.aEndPreceding = aStart;
+	          division.bEndPreceding = bStart;
+	        } else {
+	          division.aEndPreceding = aEndPreceding;
+	          division.bEndPreceding = bEndPreceding;
+	        }
+	        division.nCommonPreceding = nCommonR;
+	        if (nCommonR !== 0) {
+	          division.aCommonPreceding = aEndPreceding;
+	          division.bCommonPreceding = bEndPreceding;
+	        }
+	        division.nCommonFollowing = nCommonF;
+	        if (nCommonF !== 0) {
+	          division.aCommonFollowing = aFirst + 1;
+	          division.bCommonFollowing = bFirst + 1;
+	        }
+	        const aStartFollowing = aLast + 1;
+	        const bStartFollowing = bFirst + nCommonF + 1;
+	        division.nChangeFollowing = d - 1;
+	        if (d - 1 === aEnd + bEnd - aStartFollowing - bStartFollowing) {
+	          // Optimization: number of changes in reverse direction
+	          // is equal to number of items in following interval,
+	          // therefore it cannot contain any common items.
+	          division.aStartFollowing = aEnd;
+	          division.bStartFollowing = bEnd;
+	        } else {
+	          division.aStartFollowing = aStartFollowing;
+	          division.bStartFollowing = bStartFollowing;
+	        }
+	        return true;
+	      }
+	    }
+	  }
+	  return false;
+	};
+
+	// A complete function to extend reverse paths from (d - 1) to d changes.
+	// Return true if a path overlaps forward path of d changes in its diagonal.
+	const extendOverlappablePathsR = (
+	  d,
+	  aStart,
+	  aEnd,
+	  bStart,
+	  bEnd,
+	  isCommon,
+	  aIndexesF,
+	  iMaxF,
+	  aIndexesR,
+	  iMaxR,
+	  division // update prop values if return true
+	) => {
+	  const bR = bEnd - aEnd; // bIndex = bR + aIndex - kR
+	  const aLength = aEnd - aStart;
+	  const bLength = bEnd - bStart;
+	  const baDeltaLength = bLength - aLength; // kR = kF + baDeltaLength
+
+	  // Range of diagonals in which forward and reverse paths might overlap.
+	  const kMinOverlapR = baDeltaLength - d; // -d <= kF
+	  const kMaxOverlapR = baDeltaLength + d; // kF <= d
+
+	  let aIndexPrev1 = NOT_YET_SET; // prev value of [iR - 1] in next iteration
+
+	  // Optimization: skip diagonals in which paths cannot ever overlap.
+	  const nR = d < iMaxR ? d : iMaxR;
+
+	  // The diagonals kR = d - 2 * iR are odd when d is odd and even when d is even.
+	  for (let iR = 0, kR = d; iR <= nR; iR += 1, kR -= 2) {
+	    // To get first point of path segment, move one change in reverse direction
+	    // from last point of previous path segment in an adjacent diagonal.
+	    // In first iteration when iR === 0 and kR === d always insert.
+	    // In last possible iteration when iR === d and kR === -d always delete.
+	    const insert = iR === 0 || (iR !== d && aIndexesR[iR] < aIndexPrev1);
+	    const aLastPrev = insert ? aIndexesR[iR] : aIndexPrev1;
+	    const aFirst = insert
+	      ? aLastPrev // vertical to insert from b
+	      : aLastPrev - 1; // horizontal to delete from a
+
+	    // To get last point of path segment, move along diagonal of common items.
+	    const bFirst = bR + aFirst - kR;
+	    const nCommonR = countCommonItemsR(
+	      aStart,
+	      aFirst - 1,
+	      bStart,
+	      bFirst - 1,
+	      isCommon
+	    );
+	    const aLast = aFirst - nCommonR;
+	    aIndexPrev1 = aIndexesR[iR];
+	    aIndexesR[iR] = aLast;
+	    if (kMinOverlapR <= kR && kR <= kMaxOverlapR) {
+	      // Solve for iF of forward path with d changes in diagonal kR:
+	      // kF = kR - baDeltaLength
+	      // kF = 2 * iF - d
+	      const iF = (d + (kR - baDeltaLength)) / 2;
+
+	      // If this reverse path overlaps the forward path in this diagonal,
+	      // then this is a middle change of the index intervals.
+	      if (iF <= iMaxF && aLast - 1 <= aIndexesF[iF]) {
+	        const bLast = bFirst - nCommonR;
+	        division.nChangePreceding = d;
+	        if (d === aLast + bLast - aStart - bStart) {
+	          // Optimization: number of changes in reverse direction
+	          // is equal to number of items in preceding interval,
+	          // therefore it cannot contain any common items.
+	          division.aEndPreceding = aStart;
+	          division.bEndPreceding = bStart;
+	        } else {
+	          division.aEndPreceding = aLast;
+	          division.bEndPreceding = bLast;
+	        }
+	        division.nCommonPreceding = nCommonR;
+	        if (nCommonR !== 0) {
+	          // The last point of reverse path segment is start of common subsequence.
+	          division.aCommonPreceding = aLast;
+	          division.bCommonPreceding = bLast;
+	        }
+	        division.nChangeFollowing = d - 1;
+	        if (d === 1) {
+	          // There is no previous path segment.
+	          division.nCommonFollowing = 0;
+	          division.aStartFollowing = aEnd;
+	          division.bStartFollowing = bEnd;
+	        } else {
+	          // Unlike the Myers algorithm which finds only the middle “snake”
+	          // this package can find two common subsequences per division.
+	          // Last point of previous path segment is on an adjacent diagonal.
+	          const bLastPrev = bR + aLastPrev - (insert ? kR - 1 : kR + 1);
+
+	          // Because of invariant that intervals following the middle change
+	          // cannot have common items at the start,
+	          // move in forward direction along a diagonal of common items.
+	          const nCommonF = countCommonItemsF(
+	            aLastPrev,
+	            aEnd,
+	            bLastPrev,
+	            bEnd,
+	            isCommon
+	          );
+	          division.nCommonFollowing = nCommonF;
+	          if (nCommonF !== 0) {
+	            // The last point of reverse path segment is start of common subsequence.
+	            division.aCommonFollowing = aLastPrev;
+	            division.bCommonFollowing = bLastPrev;
+	          }
+	          const aStartFollowing = aLastPrev + nCommonF; // aFirstPrev
+	          const bStartFollowing = bLastPrev + nCommonF; // bFirstPrev
+
+	          if (d - 1 === aEnd + bEnd - aStartFollowing - bStartFollowing) {
+	            // Optimization: number of changes in forward direction
+	            // is equal to number of items in following interval,
+	            // therefore it cannot contain any common items.
+	            division.aStartFollowing = aEnd;
+	            division.bStartFollowing = bEnd;
+	          } else {
+	            division.aStartFollowing = aStartFollowing;
+	            division.bStartFollowing = bStartFollowing;
+	          }
+	        }
+	        return true;
+	      }
+	    }
+	  }
+	  return false;
+	};
+
+	// Given index intervals and input function to compare items at indexes,
+	// divide at the middle change.
+	//
+	// DO NOT CALL if start === end, because interval cannot contain common items
+	// and because this function will throw the “no overlap” error.
+	const divide = (
+	  nChange,
+	  aStart,
+	  aEnd,
+	  bStart,
+	  bEnd,
+	  isCommon,
+	  aIndexesF,
+	  aIndexesR,
+	  division // output
+	) => {
+	  const bF = bStart - aStart; // bIndex = bF + aIndex - kF
+	  const bR = bEnd - aEnd; // bIndex = bR + aIndex - kR
+	  const aLength = aEnd - aStart;
+	  const bLength = bEnd - bStart;
+
+	  // Because graph has square or portrait orientation,
+	  // length difference is minimum number of items to insert from b.
+	  // Corresponding forward and reverse diagonals in graph
+	  // depend on length difference of the sequences:
+	  // kF = kR - baDeltaLength
+	  // kR = kF + baDeltaLength
+	  const baDeltaLength = bLength - aLength;
+
+	  // Optimization: max diagonal in graph intersects corner of shorter side.
+	  let iMaxF = aLength;
+	  let iMaxR = aLength;
+
+	  // Initialize no changes yet in forward or reverse direction:
+	  aIndexesF[0] = aStart - 1; // at open start of interval, outside closed start
+	  aIndexesR[0] = aEnd; // at open end of interval
+
+	  if (baDeltaLength % 2 === 0) {
+	    // The number of changes in paths is 2 * d if length difference is even.
+	    const dMin = (nChange || baDeltaLength) / 2;
+	    const dMax = (aLength + bLength) / 2;
+	    for (let d = 1; d <= dMax; d += 1) {
+	      iMaxF = extendPathsF(d, aEnd, bEnd, bF, isCommon, aIndexesF, iMaxF);
+	      if (d < dMin) {
+	        iMaxR = extendPathsR(d, aStart, bStart, bR, isCommon, aIndexesR, iMaxR);
+	      } else if (
+	        // If a reverse path overlaps a forward path in the same diagonal,
+	        // return a division of the index intervals at the middle change.
+	        extendOverlappablePathsR(
+	          d,
+	          aStart,
+	          aEnd,
+	          bStart,
+	          bEnd,
+	          isCommon,
+	          aIndexesF,
+	          iMaxF,
+	          aIndexesR,
+	          iMaxR,
+	          division
+	        )
+	      ) {
+	        return;
+	      }
+	    }
+	  } else {
+	    // The number of changes in paths is 2 * d - 1 if length difference is odd.
+	    const dMin = ((nChange || baDeltaLength) + 1) / 2;
+	    const dMax = (aLength + bLength + 1) / 2;
+
+	    // Unroll first half iteration so loop extends the relevant pairs of paths.
+	    // Because of invariant that intervals have no common items at start or end,
+	    // and limitation not to call divide with empty intervals,
+	    // therefore it cannot be called if a forward path with one change
+	    // would overlap a reverse path with no changes, even if dMin === 1.
+	    let d = 1;
+	    iMaxF = extendPathsF(d, aEnd, bEnd, bF, isCommon, aIndexesF, iMaxF);
+	    for (d += 1; d <= dMax; d += 1) {
+	      iMaxR = extendPathsR(
+	        d - 1,
+	        aStart,
+	        bStart,
+	        bR,
+	        isCommon,
+	        aIndexesR,
+	        iMaxR
+	      );
+	      if (d < dMin) {
+	        iMaxF = extendPathsF(d, aEnd, bEnd, bF, isCommon, aIndexesF, iMaxF);
+	      } else if (
+	        // If a forward path overlaps a reverse path in the same diagonal,
+	        // return a division of the index intervals at the middle change.
+	        extendOverlappablePathsF(
+	          d,
+	          aStart,
+	          aEnd,
+	          bStart,
+	          bEnd,
+	          isCommon,
+	          aIndexesF,
+	          iMaxF,
+	          aIndexesR,
+	          iMaxR,
+	          division
+	        )
+	      ) {
+	        return;
+	      }
+	    }
+	  }
+
+	  /* istanbul ignore next */
+	  throw new Error(
+	    `${pkg}: no overlap aStart=${aStart} aEnd=${aEnd} bStart=${bStart} bEnd=${bEnd}`
+	  );
+	};
+
+	// Given index intervals and input function to compare items at indexes,
+	// return by output function the number of adjacent items and starting indexes
+	// of each common subsequence. Divide and conquer with only linear space.
+	//
+	// The index intervals are half open [start, end) like array slice method.
+	// DO NOT CALL if start === end, because interval cannot contain common items
+	// and because divide function will throw the “no overlap” error.
+	const findSubsequences = (
+	  nChange,
+	  aStart,
+	  aEnd,
+	  bStart,
+	  bEnd,
+	  transposed,
+	  callbacks,
+	  aIndexesF,
+	  aIndexesR,
+	  division // temporary memory, not input nor output
+	) => {
+	  if (bEnd - bStart < aEnd - aStart) {
+	    // Transpose graph so it has portrait instead of landscape orientation.
+	    // Always compare shorter to longer sequence for consistency and optimization.
+	    transposed = !transposed;
+	    if (transposed && callbacks.length === 1) {
+	      // Lazily wrap callback functions to swap args if graph is transposed.
+	      const {foundSubsequence, isCommon} = callbacks[0];
+	      callbacks[1] = {
+	        foundSubsequence: (nCommon, bCommon, aCommon) => {
+	          foundSubsequence(nCommon, aCommon, bCommon);
+	        },
+	        isCommon: (bIndex, aIndex) => isCommon(aIndex, bIndex)
+	      };
+	    }
+	    const tStart = aStart;
+	    const tEnd = aEnd;
+	    aStart = bStart;
+	    aEnd = bEnd;
+	    bStart = tStart;
+	    bEnd = tEnd;
+	  }
+	  const {foundSubsequence, isCommon} = callbacks[transposed ? 1 : 0];
+
+	  // Divide the index intervals at the middle change.
+	  divide(
+	    nChange,
+	    aStart,
+	    aEnd,
+	    bStart,
+	    bEnd,
+	    isCommon,
+	    aIndexesF,
+	    aIndexesR,
+	    division
+	  );
+	  const {
+	    nChangePreceding,
+	    aEndPreceding,
+	    bEndPreceding,
+	    nCommonPreceding,
+	    aCommonPreceding,
+	    bCommonPreceding,
+	    nCommonFollowing,
+	    aCommonFollowing,
+	    bCommonFollowing,
+	    nChangeFollowing,
+	    aStartFollowing,
+	    bStartFollowing
+	  } = division;
+
+	  // Unless either index interval is empty, they might contain common items.
+	  if (aStart < aEndPreceding && bStart < bEndPreceding) {
+	    // Recursely find and return common subsequences preceding the division.
+	    findSubsequences(
+	      nChangePreceding,
+	      aStart,
+	      aEndPreceding,
+	      bStart,
+	      bEndPreceding,
+	      transposed,
+	      callbacks,
+	      aIndexesF,
+	      aIndexesR,
+	      division
+	    );
+	  }
+
+	  // Return common subsequences that are adjacent to the middle change.
+	  if (nCommonPreceding !== 0) {
+	    foundSubsequence(nCommonPreceding, aCommonPreceding, bCommonPreceding);
+	  }
+	  if (nCommonFollowing !== 0) {
+	    foundSubsequence(nCommonFollowing, aCommonFollowing, bCommonFollowing);
+	  }
+
+	  // Unless either index interval is empty, they might contain common items.
+	  if (aStartFollowing < aEnd && bStartFollowing < bEnd) {
+	    // Recursely find and return common subsequences following the division.
+	    findSubsequences(
+	      nChangeFollowing,
+	      aStartFollowing,
+	      aEnd,
+	      bStartFollowing,
+	      bEnd,
+	      transposed,
+	      callbacks,
+	      aIndexesF,
+	      aIndexesR,
+	      division
+	    );
+	  }
+	};
+	const validateLength = (name, arg) => {
+	  if (typeof arg !== 'number') {
+	    throw new TypeError(`${pkg}: ${name} typeof ${typeof arg} is not a number`);
+	  }
+	  if (!Number.isSafeInteger(arg)) {
+	    throw new RangeError(`${pkg}: ${name} value ${arg} is not a safe integer`);
+	  }
+	  if (arg < 0) {
+	    throw new RangeError(`${pkg}: ${name} value ${arg} is a negative integer`);
+	  }
+	};
+	const validateCallback = (name, arg) => {
+	  const type = typeof arg;
+	  if (type !== 'function') {
+	    throw new TypeError(`${pkg}: ${name} typeof ${type} is not a function`);
+	  }
+	};
+
+	// Compare items in two sequences to find a longest common subsequence.
+	// Given lengths of sequences and input function to compare items at indexes,
+	// return by output function the number of adjacent items and starting indexes
+	// of each common subsequence.
+	function diffSequence(aLength, bLength, isCommon, foundSubsequence) {
+	  validateLength('aLength', aLength);
+	  validateLength('bLength', bLength);
+	  validateCallback('isCommon', isCommon);
+	  validateCallback('foundSubsequence', foundSubsequence);
+
+	  // Count common items from the start in the forward direction.
+	  const nCommonF = countCommonItemsF(0, aLength, 0, bLength, isCommon);
+	  if (nCommonF !== 0) {
+	    foundSubsequence(nCommonF, 0, 0);
+	  }
+
+	  // Unless both sequences consist of common items only,
+	  // find common items in the half-trimmed index intervals.
+	  if (aLength !== nCommonF || bLength !== nCommonF) {
+	    // Invariant: intervals do not have common items at the start.
+	    // The start of an index interval is closed like array slice method.
+	    const aStart = nCommonF;
+	    const bStart = nCommonF;
+
+	    // Count common items from the end in the reverse direction.
+	    const nCommonR = countCommonItemsR(
+	      aStart,
+	      aLength - 1,
+	      bStart,
+	      bLength - 1,
+	      isCommon
+	    );
+
+	    // Invariant: intervals do not have common items at the end.
+	    // The end of an index interval is open like array slice method.
+	    const aEnd = aLength - nCommonR;
+	    const bEnd = bLength - nCommonR;
+
+	    // Unless one sequence consists of common items only,
+	    // therefore the other trimmed index interval consists of changes only,
+	    // find common items in the trimmed index intervals.
+	    const nCommonFR = nCommonF + nCommonR;
+	    if (aLength !== nCommonFR && bLength !== nCommonFR) {
+	      const nChange = 0; // number of change items is not yet known
+	      const transposed = false; // call the original unwrapped functions
+	      const callbacks = [
+	        {
+	          foundSubsequence,
+	          isCommon
+	        }
+	      ];
+
+	      // Indexes in sequence a of last points in furthest reaching paths
+	      // from outside the start at top left in the forward direction:
+	      const aIndexesF = [NOT_YET_SET];
+	      // from the end at bottom right in the reverse direction:
+	      const aIndexesR = [NOT_YET_SET];
+
+	      // Initialize one object as output of all calls to divide function.
+	      const division = {
+	        aCommonFollowing: NOT_YET_SET,
+	        aCommonPreceding: NOT_YET_SET,
+	        aEndPreceding: NOT_YET_SET,
+	        aStartFollowing: NOT_YET_SET,
+	        bCommonFollowing: NOT_YET_SET,
+	        bCommonPreceding: NOT_YET_SET,
+	        bEndPreceding: NOT_YET_SET,
+	        bStartFollowing: NOT_YET_SET,
+	        nChangeFollowing: NOT_YET_SET,
+	        nChangePreceding: NOT_YET_SET,
+	        nCommonFollowing: NOT_YET_SET,
+	        nCommonPreceding: NOT_YET_SET
+	      };
+
+	      // Find and return common subsequences in the trimmed index intervals.
+	      findSubsequences(
+	        nChange,
+	        aStart,
+	        aEnd,
+	        bStart,
+	        bEnd,
+	        transposed,
+	        callbacks,
+	        aIndexesF,
+	        aIndexesR,
+	        division
+	      );
+	    }
+	    if (nCommonR !== 0) {
+	      foundSubsequence(nCommonR, aEnd, bEnd);
+	    }
+	  }
+	}
+	return build;
+}
+
+var buildExports = /*@__PURE__*/ requireBuild();
+var diffSequences = /*@__PURE__*/getDefaultExportFromCjs(buildExports);
+
+function formatTrailingSpaces(line, trailingSpaceFormatter) {
+	return line.replace(/\s+$/, (match) => trailingSpaceFormatter(match));
+}
+function printDiffLine(line, isFirstOrLast, color, indicator, trailingSpaceFormatter, emptyFirstOrLastLinePlaceholder) {
+	return line.length !== 0 ? color(`${indicator} ${formatTrailingSpaces(line, trailingSpaceFormatter)}`) : indicator !== " " ? color(indicator) : isFirstOrLast && emptyFirstOrLastLinePlaceholder.length !== 0 ? color(`${indicator} ${emptyFirstOrLastLinePlaceholder}`) : "";
+}
+function printDeleteLine(line, isFirstOrLast, { aColor, aIndicator, changeLineTrailingSpaceColor, emptyFirstOrLastLinePlaceholder }) {
+	return printDiffLine(line, isFirstOrLast, aColor, aIndicator, changeLineTrailingSpaceColor, emptyFirstOrLastLinePlaceholder);
+}
+function printInsertLine(line, isFirstOrLast, { bColor, bIndicator, changeLineTrailingSpaceColor, emptyFirstOrLastLinePlaceholder }) {
+	return printDiffLine(line, isFirstOrLast, bColor, bIndicator, changeLineTrailingSpaceColor, emptyFirstOrLastLinePlaceholder);
+}
+function printCommonLine(line, isFirstOrLast, { commonColor, commonIndicator, commonLineTrailingSpaceColor, emptyFirstOrLastLinePlaceholder }) {
+	return printDiffLine(line, isFirstOrLast, commonColor, commonIndicator, commonLineTrailingSpaceColor, emptyFirstOrLastLinePlaceholder);
+}
+// In GNU diff format, indexes are one-based instead of zero-based.
+function createPatchMark(aStart, aEnd, bStart, bEnd, { patchColor }) {
+	return patchColor(`@@ -${aStart + 1},${aEnd - aStart} +${bStart + 1},${bEnd - bStart} @@`);
+}
+// jest --no-expand
+//
+// Given array of aligned strings with inverse highlight formatting,
+// return joined lines with diff formatting (and patch marks, if needed).
+function joinAlignedDiffsNoExpand(diffs, options) {
+	const iLength = diffs.length;
+	const nContextLines = options.contextLines;
+	const nContextLines2 = nContextLines + nContextLines;
+	// First pass: count output lines and see if it has patches.
+	let jLength = iLength;
+	let hasExcessAtStartOrEnd = false;
+	let nExcessesBetweenChanges = 0;
+	let i = 0;
+	while (i !== iLength) {
+		const iStart = i;
+		while (i !== iLength && diffs[i][0] === DIFF_EQUAL) {
+			i += 1;
+		}
+		if (iStart !== i) {
+			if (iStart === 0) {
+				// at start
+				if (i > nContextLines) {
+					jLength -= i - nContextLines;
+					hasExcessAtStartOrEnd = true;
+				}
+			} else if (i === iLength) {
+				// at end
+				const n = i - iStart;
+				if (n > nContextLines) {
+					jLength -= n - nContextLines;
+					hasExcessAtStartOrEnd = true;
+				}
+			} else {
+				// between changes
+				const n = i - iStart;
+				if (n > nContextLines2) {
+					jLength -= n - nContextLines2;
+					nExcessesBetweenChanges += 1;
+				}
+			}
+		}
+		while (i !== iLength && diffs[i][0] !== DIFF_EQUAL) {
+			i += 1;
+		}
+	}
+	const hasPatch = nExcessesBetweenChanges !== 0 || hasExcessAtStartOrEnd;
+	if (nExcessesBetweenChanges !== 0) {
+		jLength += nExcessesBetweenChanges + 1;
+	} else if (hasExcessAtStartOrEnd) {
+		jLength += 1;
+	}
+	const jLast = jLength - 1;
+	const lines = [];
+	let jPatchMark = 0;
+	if (hasPatch) {
+		lines.push("");
+	}
+	// Indexes of expected or received lines in current patch:
+	let aStart = 0;
+	let bStart = 0;
+	let aEnd = 0;
+	let bEnd = 0;
+	const pushCommonLine = (line) => {
+		const j = lines.length;
+		lines.push(printCommonLine(line, j === 0 || j === jLast, options));
+		aEnd += 1;
+		bEnd += 1;
+	};
+	const pushDeleteLine = (line) => {
+		const j = lines.length;
+		lines.push(printDeleteLine(line, j === 0 || j === jLast, options));
+		aEnd += 1;
+	};
+	const pushInsertLine = (line) => {
+		const j = lines.length;
+		lines.push(printInsertLine(line, j === 0 || j === jLast, options));
+		bEnd += 1;
+	};
+	// Second pass: push lines with diff formatting (and patch marks, if needed).
+	i = 0;
+	while (i !== iLength) {
+		let iStart = i;
+		while (i !== iLength && diffs[i][0] === DIFF_EQUAL) {
+			i += 1;
+		}
+		if (iStart !== i) {
+			if (iStart === 0) {
+				// at beginning
+				if (i > nContextLines) {
+					iStart = i - nContextLines;
+					aStart = iStart;
+					bStart = iStart;
+					aEnd = aStart;
+					bEnd = bStart;
+				}
+				for (let iCommon = iStart; iCommon !== i; iCommon += 1) {
+					pushCommonLine(diffs[iCommon][1]);
+				}
+			} else if (i === iLength) {
+				// at end
+				const iEnd = i - iStart > nContextLines ? iStart + nContextLines : i;
+				for (let iCommon = iStart; iCommon !== iEnd; iCommon += 1) {
+					pushCommonLine(diffs[iCommon][1]);
+				}
+			} else {
+				// between changes
+				const nCommon = i - iStart;
+				if (nCommon > nContextLines2) {
+					const iEnd = iStart + nContextLines;
+					for (let iCommon = iStart; iCommon !== iEnd; iCommon += 1) {
+						pushCommonLine(diffs[iCommon][1]);
+					}
+					lines[jPatchMark] = createPatchMark(aStart, aEnd, bStart, bEnd, options);
+					jPatchMark = lines.length;
+					lines.push("");
+					const nOmit = nCommon - nContextLines2;
+					aStart = aEnd + nOmit;
+					bStart = bEnd + nOmit;
+					aEnd = aStart;
+					bEnd = bStart;
+					for (let iCommon = i - nContextLines; iCommon !== i; iCommon += 1) {
+						pushCommonLine(diffs[iCommon][1]);
+					}
+				} else {
+					for (let iCommon = iStart; iCommon !== i; iCommon += 1) {
+						pushCommonLine(diffs[iCommon][1]);
+					}
+				}
+			}
+		}
+		while (i !== iLength && diffs[i][0] === DIFF_DELETE) {
+			pushDeleteLine(diffs[i][1]);
+			i += 1;
+		}
+		while (i !== iLength && diffs[i][0] === DIFF_INSERT) {
+			pushInsertLine(diffs[i][1]);
+			i += 1;
+		}
+	}
+	if (hasPatch) {
+		lines[jPatchMark] = createPatchMark(aStart, aEnd, bStart, bEnd, options);
+	}
+	return lines.join("\n");
+}
+// jest --expand
+//
+// Given array of aligned strings with inverse highlight formatting,
+// return joined lines with diff formatting.
+function joinAlignedDiffsExpand(diffs, options) {
+	return diffs.map((diff, i, diffs) => {
+		const line = diff[1];
+		const isFirstOrLast = i === 0 || i === diffs.length - 1;
+		switch (diff[0]) {
+			case DIFF_DELETE: return printDeleteLine(line, isFirstOrLast, options);
+			case DIFF_INSERT: return printInsertLine(line, isFirstOrLast, options);
+			default: return printCommonLine(line, isFirstOrLast, options);
+		}
+	}).join("\n");
+}
+
+const noColor = (string) => string;
+const DIFF_CONTEXT_DEFAULT = 5;
+const DIFF_TRUNCATE_THRESHOLD_DEFAULT = 0;
+function getDefaultOptions() {
+	return {
+		aAnnotation: "Expected",
+		aColor: c.green,
+		aIndicator: "-",
+		bAnnotation: "Received",
+		bColor: c.red,
+		bIndicator: "+",
+		changeColor: c.inverse,
+		changeLineTrailingSpaceColor: noColor,
+		commonColor: c.dim,
+		commonIndicator: " ",
+		commonLineTrailingSpaceColor: noColor,
+		compareKeys: undefined,
+		contextLines: DIFF_CONTEXT_DEFAULT,
+		emptyFirstOrLastLinePlaceholder: "",
+		expand: false,
+		includeChangeCounts: false,
+		omitAnnotationLines: false,
+		patchColor: c.yellow,
+		printBasicPrototype: false,
+		truncateThreshold: DIFF_TRUNCATE_THRESHOLD_DEFAULT,
+		truncateAnnotation: "... Diff result is truncated",
+		truncateAnnotationColor: noColor
+	};
+}
+function getCompareKeys(compareKeys) {
+	return compareKeys && typeof compareKeys === "function" ? compareKeys : undefined;
+}
+function getContextLines(contextLines) {
+	return typeof contextLines === "number" && Number.isSafeInteger(contextLines) && contextLines >= 0 ? contextLines : DIFF_CONTEXT_DEFAULT;
+}
+// Pure function returns options with all properties.
+function normalizeDiffOptions(options = {}) {
+	return {
+		...getDefaultOptions(),
+		...options,
+		compareKeys: getCompareKeys(options.compareKeys),
+		contextLines: getContextLines(options.contextLines)
+	};
+}
+
+function isEmptyString(lines) {
+	return lines.length === 1 && lines[0].length === 0;
+}
+function countChanges(diffs) {
+	let a = 0;
+	let b = 0;
+	diffs.forEach((diff) => {
+		switch (diff[0]) {
+			case DIFF_DELETE:
+				a += 1;
+				break;
+			case DIFF_INSERT:
+				b += 1;
+				break;
+		}
+	});
+	return {
+		a,
+		b
+	};
+}
+function printAnnotation({ aAnnotation, aColor, aIndicator, bAnnotation, bColor, bIndicator, includeChangeCounts, omitAnnotationLines }, changeCounts) {
+	if (omitAnnotationLines) {
+		return "";
+	}
+	let aRest = "";
+	let bRest = "";
+	if (includeChangeCounts) {
+		const aCount = String(changeCounts.a);
+		const bCount = String(changeCounts.b);
+		// Padding right aligns the ends of the annotations.
+		const baAnnotationLengthDiff = bAnnotation.length - aAnnotation.length;
+		const aAnnotationPadding = " ".repeat(Math.max(0, baAnnotationLengthDiff));
+		const bAnnotationPadding = " ".repeat(Math.max(0, -baAnnotationLengthDiff));
+		// Padding left aligns the ends of the counts.
+		const baCountLengthDiff = bCount.length - aCount.length;
+		const aCountPadding = " ".repeat(Math.max(0, baCountLengthDiff));
+		const bCountPadding = " ".repeat(Math.max(0, -baCountLengthDiff));
+		aRest = `${aAnnotationPadding}  ${aIndicator} ${aCountPadding}${aCount}`;
+		bRest = `${bAnnotationPadding}  ${bIndicator} ${bCountPadding}${bCount}`;
+	}
+	const a = `${aIndicator} ${aAnnotation}${aRest}`;
+	const b = `${bIndicator} ${bAnnotation}${bRest}`;
+	return `${aColor(a)}\n${bColor(b)}\n\n`;
+}
+function printDiffLines(diffs, truncated, options) {
+	return printAnnotation(options, countChanges(diffs)) + (options.expand ? joinAlignedDiffsExpand(diffs, options) : joinAlignedDiffsNoExpand(diffs, options)) + (truncated ? options.truncateAnnotationColor(`\n${options.truncateAnnotation}`) : "");
+}
+// Compare two arrays of strings line-by-line. Format as comparison lines.
+function diffLinesUnified(aLines, bLines, options) {
+	const normalizedOptions = normalizeDiffOptions(options);
+	const [diffs, truncated] = diffLinesRaw(isEmptyString(aLines) ? [] : aLines, isEmptyString(bLines) ? [] : bLines, normalizedOptions);
+	return printDiffLines(diffs, truncated, normalizedOptions);
+}
+// Given two pairs of arrays of strings:
+// Compare the pair of comparison arrays line-by-line.
+// Format the corresponding lines in the pair of displayable arrays.
+function diffLinesUnified2(aLinesDisplay, bLinesDisplay, aLinesCompare, bLinesCompare, options) {
+	if (isEmptyString(aLinesDisplay) && isEmptyString(aLinesCompare)) {
+		aLinesDisplay = [];
+		aLinesCompare = [];
+	}
+	if (isEmptyString(bLinesDisplay) && isEmptyString(bLinesCompare)) {
+		bLinesDisplay = [];
+		bLinesCompare = [];
+	}
+	if (aLinesDisplay.length !== aLinesCompare.length || bLinesDisplay.length !== bLinesCompare.length) {
+		// Fall back to diff of display lines.
+		return diffLinesUnified(aLinesDisplay, bLinesDisplay, options);
+	}
+	const [diffs, truncated] = diffLinesRaw(aLinesCompare, bLinesCompare, options);
+	// Replace comparison lines with displayable lines.
+	let aIndex = 0;
+	let bIndex = 0;
+	diffs.forEach((diff) => {
+		switch (diff[0]) {
+			case DIFF_DELETE:
+				diff[1] = aLinesDisplay[aIndex];
+				aIndex += 1;
+				break;
+			case DIFF_INSERT:
+				diff[1] = bLinesDisplay[bIndex];
+				bIndex += 1;
+				break;
+			default:
+				diff[1] = bLinesDisplay[bIndex];
+				aIndex += 1;
+				bIndex += 1;
+		}
+	});
+	return printDiffLines(diffs, truncated, normalizeDiffOptions(options));
+}
+// Compare two arrays of strings line-by-line.
+function diffLinesRaw(aLines, bLines, options) {
+	const truncate = (options === null || options === void 0 ? void 0 : options.truncateThreshold) ?? false;
+	const truncateThreshold = Math.max(Math.floor((options === null || options === void 0 ? void 0 : options.truncateThreshold) ?? 0), 0);
+	const aLength = truncate ? Math.min(aLines.length, truncateThreshold) : aLines.length;
+	const bLength = truncate ? Math.min(bLines.length, truncateThreshold) : bLines.length;
+	const truncated = aLength !== aLines.length || bLength !== bLines.length;
+	const isCommon = (aIndex, bIndex) => aLines[aIndex] === bLines[bIndex];
+	const diffs = [];
+	let aIndex = 0;
+	let bIndex = 0;
+	const foundSubsequence = (nCommon, aCommon, bCommon) => {
+		for (; aIndex !== aCommon; aIndex += 1) {
+			diffs.push(new Diff(DIFF_DELETE, aLines[aIndex]));
+		}
+		for (; bIndex !== bCommon; bIndex += 1) {
+			diffs.push(new Diff(DIFF_INSERT, bLines[bIndex]));
+		}
+		for (; nCommon !== 0; nCommon -= 1, aIndex += 1, bIndex += 1) {
+			diffs.push(new Diff(DIFF_EQUAL, bLines[bIndex]));
+		}
+	};
+	diffSequences(aLength, bLength, isCommon, foundSubsequence);
+	// After the last common subsequence, push remaining change items.
+	for (; aIndex !== aLength; aIndex += 1) {
+		diffs.push(new Diff(DIFF_DELETE, aLines[aIndex]));
+	}
+	for (; bIndex !== bLength; bIndex += 1) {
+		diffs.push(new Diff(DIFF_INSERT, bLines[bIndex]));
+	}
+	return [diffs, truncated];
+}
+
+// get the type of a value with handling the edge cases like `typeof []`
+// and `typeof null`
+function getType(value) {
+	if (value === undefined) {
+		return "undefined";
+	} else if (value === null) {
+		return "null";
+	} else if (Array.isArray(value)) {
+		return "array";
+	} else if (typeof value === "boolean") {
+		return "boolean";
+	} else if (typeof value === "function") {
+		return "function";
+	} else if (typeof value === "number") {
+		return "number";
+	} else if (typeof value === "string") {
+		return "string";
+	} else if (typeof value === "bigint") {
+		return "bigint";
+	} else if (typeof value === "object") {
+		if (value != null) {
+			if (value.constructor === RegExp) {
+				return "regexp";
+			} else if (value.constructor === Map) {
+				return "map";
+			} else if (value.constructor === Set) {
+				return "set";
+			} else if (value.constructor === Date) {
+				return "date";
+			}
+		}
+		return "object";
+	} else if (typeof value === "symbol") {
+		return "symbol";
+	}
+	throw new Error(`value of unknown type: ${value}`);
+}
+
+// platforms compatible
+function getNewLineSymbol(string) {
+	return string.includes("\r\n") ? "\r\n" : "\n";
+}
+function diffStrings(a, b, options) {
+	const truncate = (options === null || options === void 0 ? void 0 : options.truncateThreshold) ?? false;
+	const truncateThreshold = Math.max(Math.floor((options === null || options === void 0 ? void 0 : options.truncateThreshold) ?? 0), 0);
+	let aLength = a.length;
+	let bLength = b.length;
+	if (truncate) {
+		const aMultipleLines = a.includes("\n");
+		const bMultipleLines = b.includes("\n");
+		const aNewLineSymbol = getNewLineSymbol(a);
+		const bNewLineSymbol = getNewLineSymbol(b);
+		// multiple-lines string expects a newline to be appended at the end
+		const _a = aMultipleLines ? `${a.split(aNewLineSymbol, truncateThreshold).join(aNewLineSymbol)}\n` : a;
+		const _b = bMultipleLines ? `${b.split(bNewLineSymbol, truncateThreshold).join(bNewLineSymbol)}\n` : b;
+		aLength = _a.length;
+		bLength = _b.length;
+	}
+	const truncated = aLength !== a.length || bLength !== b.length;
+	const isCommon = (aIndex, bIndex) => a[aIndex] === b[bIndex];
+	let aIndex = 0;
+	let bIndex = 0;
+	const diffs = [];
+	const foundSubsequence = (nCommon, aCommon, bCommon) => {
+		if (aIndex !== aCommon) {
+			diffs.push(new Diff(DIFF_DELETE, a.slice(aIndex, aCommon)));
+		}
+		if (bIndex !== bCommon) {
+			diffs.push(new Diff(DIFF_INSERT, b.slice(bIndex, bCommon)));
+		}
+		aIndex = aCommon + nCommon;
+		bIndex = bCommon + nCommon;
+		diffs.push(new Diff(DIFF_EQUAL, b.slice(bCommon, bIndex)));
+	};
+	diffSequences(aLength, bLength, isCommon, foundSubsequence);
+	// After the last common subsequence, push remaining change items.
+	if (aIndex !== aLength) {
+		diffs.push(new Diff(DIFF_DELETE, a.slice(aIndex)));
+	}
+	if (bIndex !== bLength) {
+		diffs.push(new Diff(DIFF_INSERT, b.slice(bIndex)));
+	}
+	return [diffs, truncated];
+}
+
+// Given change op and array of diffs, return concatenated string:
+// * include common strings
+// * include change strings which have argument op with changeColor
+// * exclude change strings which have opposite op
+function concatenateRelevantDiffs(op, diffs, changeColor) {
+	return diffs.reduce((reduced, diff) => reduced + (diff[0] === DIFF_EQUAL ? diff[1] : diff[0] === op && diff[1].length !== 0 ? changeColor(diff[1]) : ""), "");
+}
+// Encapsulate change lines until either a common newline or the end.
+class ChangeBuffer {
+	op;
+	line;
+	lines;
+	changeColor;
+	constructor(op, changeColor) {
+		this.op = op;
+		this.line = [];
+		this.lines = [];
+		this.changeColor = changeColor;
+	}
+	pushSubstring(substring) {
+		this.pushDiff(new Diff(this.op, substring));
+	}
+	pushLine() {
+		// Assume call only if line has at least one diff,
+		// therefore an empty line must have a diff which has an empty string.
+		// If line has multiple diffs, then assume it has a common diff,
+		// therefore change diffs have change color;
+		// otherwise then it has line color only.
+		this.lines.push(this.line.length !== 1 ? new Diff(this.op, concatenateRelevantDiffs(this.op, this.line, this.changeColor)) : this.line[0][0] === this.op ? this.line[0] : new Diff(this.op, this.line[0][1]));
+		this.line.length = 0;
+	}
+	isLineEmpty() {
+		return this.line.length === 0;
+	}
+	// Minor input to buffer.
+	pushDiff(diff) {
+		this.line.push(diff);
+	}
+	// Main input to buffer.
+	align(diff) {
+		const string = diff[1];
+		if (string.includes("\n")) {
+			const substrings = string.split("\n");
+			const iLast = substrings.length - 1;
+			substrings.forEach((substring, i) => {
+				if (i < iLast) {
+					// The first substring completes the current change line.
+					// A middle substring is a change line.
+					this.pushSubstring(substring);
+					this.pushLine();
+				} else if (substring.length !== 0) {
+					// The last substring starts a change line, if it is not empty.
+					// Important: This non-empty condition also automatically omits
+					// the newline appended to the end of expected and received strings.
+					this.pushSubstring(substring);
+				}
+			});
+		} else {
+			// Append non-multiline string to current change line.
+			this.pushDiff(diff);
+		}
+	}
+	// Output from buffer.
+	moveLinesTo(lines) {
+		if (!this.isLineEmpty()) {
+			this.pushLine();
+		}
+		lines.push(...this.lines);
+		this.lines.length = 0;
+	}
+}
+// Encapsulate common and change lines.
+class CommonBuffer {
+	deleteBuffer;
+	insertBuffer;
+	lines;
+	constructor(deleteBuffer, insertBuffer) {
+		this.deleteBuffer = deleteBuffer;
+		this.insertBuffer = insertBuffer;
+		this.lines = [];
+	}
+	pushDiffCommonLine(diff) {
+		this.lines.push(diff);
+	}
+	pushDiffChangeLines(diff) {
+		const isDiffEmpty = diff[1].length === 0;
+		// An empty diff string is redundant, unless a change line is empty.
+		if (!isDiffEmpty || this.deleteBuffer.isLineEmpty()) {
+			this.deleteBuffer.pushDiff(diff);
+		}
+		if (!isDiffEmpty || this.insertBuffer.isLineEmpty()) {
+			this.insertBuffer.pushDiff(diff);
+		}
+	}
+	flushChangeLines() {
+		this.deleteBuffer.moveLinesTo(this.lines);
+		this.insertBuffer.moveLinesTo(this.lines);
+	}
+	// Input to buffer.
+	align(diff) {
+		const op = diff[0];
+		const string = diff[1];
+		if (string.includes("\n")) {
+			const substrings = string.split("\n");
+			const iLast = substrings.length - 1;
+			substrings.forEach((substring, i) => {
+				if (i === 0) {
+					const subdiff = new Diff(op, substring);
+					if (this.deleteBuffer.isLineEmpty() && this.insertBuffer.isLineEmpty()) {
+						// If both current change lines are empty,
+						// then the first substring is a common line.
+						this.flushChangeLines();
+						this.pushDiffCommonLine(subdiff);
+					} else {
+						// If either current change line is non-empty,
+						// then the first substring completes the change lines.
+						this.pushDiffChangeLines(subdiff);
+						this.flushChangeLines();
+					}
+				} else if (i < iLast) {
+					// A middle substring is a common line.
+					this.pushDiffCommonLine(new Diff(op, substring));
+				} else if (substring.length !== 0) {
+					// The last substring starts a change line, if it is not empty.
+					// Important: This non-empty condition also automatically omits
+					// the newline appended to the end of expected and received strings.
+					this.pushDiffChangeLines(new Diff(op, substring));
+				}
+			});
+		} else {
+			// Append non-multiline string to current change lines.
+			// Important: It cannot be at the end following empty change lines,
+			// because newline appended to the end of expected and received strings.
+			this.pushDiffChangeLines(diff);
+		}
+	}
+	// Output from buffer.
+	getLines() {
+		this.flushChangeLines();
+		return this.lines;
+	}
+}
+// Given diffs from expected and received strings,
+// return new array of diffs split or joined into lines.
+//
+// To correctly align a change line at the end, the algorithm:
+// * assumes that a newline was appended to the strings
+// * omits the last newline from the output array
+//
+// Assume the function is not called:
+// * if either expected or received is empty string
+// * if neither expected nor received is multiline string
+function getAlignedDiffs(diffs, changeColor) {
+	const deleteBuffer = new ChangeBuffer(DIFF_DELETE, changeColor);
+	const insertBuffer = new ChangeBuffer(DIFF_INSERT, changeColor);
+	const commonBuffer = new CommonBuffer(deleteBuffer, insertBuffer);
+	diffs.forEach((diff) => {
+		switch (diff[0]) {
+			case DIFF_DELETE:
+				deleteBuffer.align(diff);
+				break;
+			case DIFF_INSERT:
+				insertBuffer.align(diff);
+				break;
+			default: commonBuffer.align(diff);
+		}
+	});
+	return commonBuffer.getLines();
+}
+
+function hasCommonDiff(diffs, isMultiline) {
+	if (isMultiline) {
+		// Important: Ignore common newline that was appended to multiline strings!
+		const iLast = diffs.length - 1;
+		return diffs.some((diff, i) => diff[0] === DIFF_EQUAL && (i !== iLast || diff[1] !== "\n"));
+	}
+	return diffs.some((diff) => diff[0] === DIFF_EQUAL);
+}
+// Compare two strings character-by-character.
+// Format as comparison lines in which changed substrings have inverse colors.
+function diffStringsUnified(a, b, options) {
+	if (a !== b && a.length !== 0 && b.length !== 0) {
+		const isMultiline = a.includes("\n") || b.includes("\n");
+		// getAlignedDiffs assumes that a newline was appended to the strings.
+		const [diffs, truncated] = diffStringsRaw(isMultiline ? `${a}\n` : a, isMultiline ? `${b}\n` : b, true, options);
+		if (hasCommonDiff(diffs, isMultiline)) {
+			const optionsNormalized = normalizeDiffOptions(options);
+			const lines = getAlignedDiffs(diffs, optionsNormalized.changeColor);
+			return printDiffLines(lines, truncated, optionsNormalized);
+		}
+	}
+	// Fall back to line-by-line diff.
+	return diffLinesUnified(a.split("\n"), b.split("\n"), options);
+}
+// Compare two strings character-by-character.
+// Optionally clean up small common substrings, also known as chaff.
+function diffStringsRaw(a, b, cleanup, options) {
+	const [diffs, truncated] = diffStrings(a, b, options);
+	if (cleanup) {
+		diff_cleanupSemantic(diffs);
+	}
+	return [diffs, truncated];
+}
+
+function getCommonMessage(message, options) {
+	const { commonColor } = normalizeDiffOptions(options);
+	return commonColor(message);
+}
+const { AsymmetricMatcher, DOMCollection, DOMElement, Immutable, ReactElement, ReactTestComponent } = plugins;
+const PLUGINS = [
+	ReactTestComponent,
+	ReactElement,
+	DOMElement,
+	DOMCollection,
+	Immutable,
+	AsymmetricMatcher,
+	plugins.Error
+];
+const FORMAT_OPTIONS = {
+	maxDepth: 20,
+	plugins: PLUGINS
+};
+const FALLBACK_FORMAT_OPTIONS = {
+	callToJSON: false,
+	maxDepth: 8,
+	plugins: PLUGINS
+};
+// Generate a string that will highlight the difference between two values
+// with green and red. (similar to how github does code diffing)
+/**
+* @param a Expected value
+* @param b Received value
+* @param options Diff options
+* @returns {string | null} a string diff
+*/
+function diff(a, b, options) {
+	if (Object.is(a, b)) {
+		return "";
+	}
+	const aType = getType(a);
+	let expectedType = aType;
+	let omitDifference = false;
+	if (aType === "object" && typeof a.asymmetricMatch === "function") {
+		if (a.$$typeof !== Symbol.for("jest.asymmetricMatcher")) {
+			// Do not know expected type of user-defined asymmetric matcher.
+			return undefined;
+		}
+		if (typeof a.getExpectedType !== "function") {
+			// For example, expect.anything() matches either null or undefined
+			return undefined;
+		}
+		expectedType = a.getExpectedType();
+		// Primitive types boolean and number omit difference below.
+		// For example, omit difference for expect.stringMatching(regexp)
+		omitDifference = expectedType === "string";
+	}
+	if (expectedType !== getType(b)) {
+		const { aAnnotation, aColor, aIndicator, bAnnotation, bColor, bIndicator } = normalizeDiffOptions(options);
+		const formatOptions = getFormatOptions(FALLBACK_FORMAT_OPTIONS, options);
+		let aDisplay = format(a, formatOptions);
+		let bDisplay = format(b, formatOptions);
+		// even if prettyFormat prints successfully big objects,
+		// large string can choke later on (concatenation? RPC?),
+		// so truncate it to a reasonable length here.
+		// (For example, playwright's ElementHandle can become about 200_000_000 length string)
+		const MAX_LENGTH = 1e5;
+		function truncate(s) {
+			return s.length <= MAX_LENGTH ? s : `${s.slice(0, MAX_LENGTH)}...`;
+		}
+		aDisplay = truncate(aDisplay);
+		bDisplay = truncate(bDisplay);
+		const aDiff = `${aColor(`${aIndicator} ${aAnnotation}:`)} \n${aDisplay}`;
+		const bDiff = `${bColor(`${bIndicator} ${bAnnotation}:`)} \n${bDisplay}`;
+		return `${aDiff}\n\n${bDiff}`;
+	}
+	if (omitDifference) {
+		return undefined;
+	}
+	switch (aType) {
+		case "string": return diffLinesUnified(a.split("\n"), b.split("\n"), options);
+		case "boolean":
+		case "number": return comparePrimitive(a, b, options);
+		case "map": return compareObjects(sortMap(a), sortMap(b), options);
+		case "set": return compareObjects(sortSet(a), sortSet(b), options);
+		default: return compareObjects(a, b, options);
+	}
+}
+function comparePrimitive(a, b, options) {
+	const aFormat = format(a, FORMAT_OPTIONS);
+	const bFormat = format(b, FORMAT_OPTIONS);
+	return aFormat === bFormat ? "" : diffLinesUnified(aFormat.split("\n"), bFormat.split("\n"), options);
+}
+function sortMap(map) {
+	return new Map(Array.from(map.entries()).sort());
+}
+function sortSet(set) {
+	return new Set(Array.from(set.values()).sort());
+}
+function compareObjects(a, b, options) {
+	let difference;
+	let hasThrown = false;
+	try {
+		const formatOptions = getFormatOptions(FORMAT_OPTIONS, options);
+		difference = getObjectsDifference(a, b, formatOptions, options);
+	} catch {
+		hasThrown = true;
+	}
+	const noDiffMessage = getCommonMessage(NO_DIFF_MESSAGE, options);
+	// If the comparison yields no results, compare again but this time
+	// without calling `toJSON`. It's also possible that toJSON might throw.
+	if (difference === undefined || difference === noDiffMessage) {
+		const formatOptions = getFormatOptions(FALLBACK_FORMAT_OPTIONS, options);
+		difference = getObjectsDifference(a, b, formatOptions, options);
+		if (difference !== noDiffMessage && !hasThrown) {
+			difference = `${getCommonMessage(SIMILAR_MESSAGE, options)}\n\n${difference}`;
+		}
+	}
+	return difference;
+}
+function getFormatOptions(formatOptions, options) {
+	const { compareKeys, printBasicPrototype, maxDepth } = normalizeDiffOptions(options);
+	return {
+		...formatOptions,
+		compareKeys,
+		printBasicPrototype,
+		maxDepth: maxDepth ?? formatOptions.maxDepth
+	};
+}
+function getObjectsDifference(a, b, formatOptions, options) {
+	const formatOptionsZeroIndent = {
+		...formatOptions,
+		indent: 0
+	};
+	const aCompare = format(a, formatOptionsZeroIndent);
+	const bCompare = format(b, formatOptionsZeroIndent);
+	if (aCompare === bCompare) {
+		return getCommonMessage(NO_DIFF_MESSAGE, options);
+	} else {
+		const aDisplay = format(a, formatOptions);
+		const bDisplay = format(b, formatOptions);
+		return diffLinesUnified2(aDisplay.split("\n"), bDisplay.split("\n"), aCompare.split("\n"), bCompare.split("\n"), options);
+	}
+}
+const MAX_DIFF_STRING_LENGTH = 2e4;
+function isAsymmetricMatcher(data) {
+	const type = getType$1(data);
+	return type === "Object" && typeof data.asymmetricMatch === "function";
+}
+function isReplaceable(obj1, obj2) {
+	const obj1Type = getType$1(obj1);
+	const obj2Type = getType$1(obj2);
+	return obj1Type === obj2Type && (obj1Type === "Object" || obj1Type === "Array");
+}
+function printDiffOrStringify(received, expected, options) {
+	const { aAnnotation, bAnnotation } = normalizeDiffOptions(options);
+	if (typeof expected === "string" && typeof received === "string" && expected.length > 0 && received.length > 0 && expected.length <= MAX_DIFF_STRING_LENGTH && received.length <= MAX_DIFF_STRING_LENGTH && expected !== received) {
+		if (expected.includes("\n") || received.includes("\n")) {
+			return diffStringsUnified(expected, received, options);
+		}
+		const [diffs] = diffStringsRaw(expected, received, true);
+		const hasCommonDiff = diffs.some((diff) => diff[0] === DIFF_EQUAL);
+		const printLabel = getLabelPrinter(aAnnotation, bAnnotation);
+		const expectedLine = printLabel(aAnnotation) + printExpected(getCommonAndChangedSubstrings(diffs, DIFF_DELETE, hasCommonDiff));
+		const receivedLine = printLabel(bAnnotation) + printReceived(getCommonAndChangedSubstrings(diffs, DIFF_INSERT, hasCommonDiff));
+		return `${expectedLine}\n${receivedLine}`;
+	}
+	// if (isLineDiffable(expected, received)) {
+	const clonedExpected = deepClone(expected, { forceWritable: true });
+	const clonedReceived = deepClone(received, { forceWritable: true });
+	const { replacedExpected, replacedActual } = replaceAsymmetricMatcher(clonedReceived, clonedExpected);
+	const difference = diff(replacedExpected, replacedActual, options);
+	return difference;
+	// }
+	// const printLabel = getLabelPrinter(aAnnotation, bAnnotation)
+	// const expectedLine = printLabel(aAnnotation) + printExpected(expected)
+	// const receivedLine
+	//   = printLabel(bAnnotation)
+	//   + (stringify(expected) === stringify(received)
+	//     ? 'serializes to the same string'
+	//     : printReceived(received))
+	// return `${expectedLine}\n${receivedLine}`
+}
+function replaceAsymmetricMatcher(actual, expected, actualReplaced = new WeakSet(), expectedReplaced = new WeakSet()) {
+	// handle asymmetric Error.cause diff
+	if (actual instanceof Error && expected instanceof Error && typeof actual.cause !== "undefined" && typeof expected.cause === "undefined") {
+		delete actual.cause;
+		return {
+			replacedActual: actual,
+			replacedExpected: expected
+		};
+	}
+	if (!isReplaceable(actual, expected)) {
+		return {
+			replacedActual: actual,
+			replacedExpected: expected
+		};
+	}
+	if (actualReplaced.has(actual) || expectedReplaced.has(expected)) {
+		return {
+			replacedActual: actual,
+			replacedExpected: expected
+		};
+	}
+	actualReplaced.add(actual);
+	expectedReplaced.add(expected);
+	getOwnProperties(expected).forEach((key) => {
+		const expectedValue = expected[key];
+		const actualValue = actual[key];
+		if (isAsymmetricMatcher(expectedValue)) {
+			if (expectedValue.asymmetricMatch(actualValue)) {
+				// When matcher matches, replace expected with actual value
+				// so they appear the same in the diff
+				expected[key] = actualValue;
+			} else if ("sample" in expectedValue && expectedValue.sample !== undefined && isReplaceable(actualValue, expectedValue.sample)) {
+				// For container matchers (ArrayContaining, ObjectContaining), unwrap and recursively process
+				// Matcher doesn't match: unwrap but keep structure to show mismatch
+				const replaced = replaceAsymmetricMatcher(actualValue, expectedValue.sample, actualReplaced, expectedReplaced);
+				actual[key] = replaced.replacedActual;
+				expected[key] = replaced.replacedExpected;
+			}
+		} else if (isAsymmetricMatcher(actualValue)) {
+			if (actualValue.asymmetricMatch(expectedValue)) {
+				actual[key] = expectedValue;
+			} else if ("sample" in actualValue && actualValue.sample !== undefined && isReplaceable(actualValue.sample, expectedValue)) {
+				const replaced = replaceAsymmetricMatcher(actualValue.sample, expectedValue, actualReplaced, expectedReplaced);
+				actual[key] = replaced.replacedActual;
+				expected[key] = replaced.replacedExpected;
+			}
+		} else if (isReplaceable(actualValue, expectedValue)) {
+			const replaced = replaceAsymmetricMatcher(actualValue, expectedValue, actualReplaced, expectedReplaced);
+			actual[key] = replaced.replacedActual;
+			expected[key] = replaced.replacedExpected;
+		}
+	});
+	return {
+		replacedActual: actual,
+		replacedExpected: expected
+	};
+}
+function getLabelPrinter(...strings) {
+	const maxLength = strings.reduce((max, string) => string.length > max ? string.length : max, 0);
+	return (string) => `${string}: ${" ".repeat(maxLength - string.length)}`;
+}
+const SPACE_SYMBOL = "·";
+function replaceTrailingSpaces(text) {
+	return text.replace(/\s+$/gm, (spaces) => SPACE_SYMBOL.repeat(spaces.length));
+}
+function printReceived(object) {
+	return c.red(replaceTrailingSpaces(stringify(object)));
+}
+function printExpected(value) {
+	return c.green(replaceTrailingSpaces(stringify(value)));
+}
+function getCommonAndChangedSubstrings(diffs, op, hasCommonDiff) {
+	return diffs.reduce((reduced, diff) => reduced + (diff[0] === DIFF_EQUAL ? diff[1] : diff[0] === op ? hasCommonDiff ? c.inverse(diff[1]) : diff[1] : ""), "");
+}
+
+export { DIFF_DELETE, DIFF_EQUAL, DIFF_INSERT, Diff, diff, diffLinesRaw, diffLinesUnified, diffLinesUnified2, diffStringsRaw, diffStringsUnified, getLabelPrinter, printDiffOrStringify, replaceAsymmetricMatcher };