From 76cb9c2a39d477a64824a985ade40507e3bbade1 Mon Sep 17 00:00:00 2001
From: Adam Mathes <adam@adammathes.com>
Date: Fri, 13 Feb 2026 21:34:48 -0800
Subject: feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

---
 vanilla/node_modules/@exodus/bytes/whatwg.js | 80 ++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 vanilla/node_modules/@exodus/bytes/whatwg.js

(limited to 'vanilla/node_modules/@exodus/bytes/whatwg.js')

diff --git a/vanilla/node_modules/@exodus/bytes/whatwg.js b/vanilla/node_modules/@exodus/bytes/whatwg.js
new file mode 100644
index 0000000..7f4d05c
--- /dev/null
+++ b/vanilla/node_modules/@exodus/bytes/whatwg.js
@@ -0,0 +1,80 @@
+import { utf8fromStringLoose } from '@exodus/bytes/utf8.js'
+import { createSinglebyteEncoder } from '@exodus/bytes/single-byte.js'
+import {
+  isMultibyte,
+  getMultibyteEncoder,
+  normalizeEncoding,
+  E_ENCODING,
+} from './fallback/encoding.js'
+import { percentEncoder } from './fallback/percent.js'
+import { encodeMap } from './fallback/single-byte.js'
+import { E_STRING } from './fallback/_utils.js'
+
+// https://url.spec.whatwg.org/#string-percent-encode-after-encoding
+// Codepoints below 0x20, 0x7F specifically, and above 0x7F (non-ASCII) are always encoded
+// > A C0 control is a code point in the range U+0000 NULL to U+001F INFORMATION SEPARATOR ONE, inclusive.
+// > The C0 control percent-encode set are the C0 controls and all code points greater than U+007E (~).
+export function percentEncodeAfterEncoding(encoding, input, percentEncodeSet, spaceAsPlus = false) {
+  const enc = normalizeEncoding(encoding)
+  // Ref: https://encoding.spec.whatwg.org/#get-an-encoder
+  if (!enc || enc === 'replacement' || enc === 'utf-16le' || enc === 'utf-16be') {
+    throw new RangeError(E_ENCODING)
+  }
+
+  const percent = percentEncoder(percentEncodeSet, spaceAsPlus)
+  if (enc === 'utf-8') return percent(utf8fromStringLoose(input))
+
+  const multi = isMultibyte(enc)
+  const encoder = multi ? getMultibyteEncoder() : createSinglebyteEncoder
+  const fatal = encoder(enc)
+  try {
+    return percent(fatal(input))
+  } catch {}
+
+  let res = ''
+  let last = 0
+  if (multi) {
+    const rep = enc === 'gb18030' ? percent(fatal('\uFFFD')) : `%26%23${0xff_fd}%3B` // only gb18030 can encode it
+    const escaping = encoder(enc, (cp, u, i) => {
+      res += percent(u, last, i)
+      res += cp >= 0xd8_00 && cp < 0xe0_00 ? rep : `%26%23${cp}%3B` // &#cp;
+      last = i
+      return 0 // no bytes emitted
+    })
+
+    const u = escaping(input) // has side effects on res
+    res += percent(u, last)
+  } else {
+    if (typeof input !== 'string') throw new TypeError(E_STRING) // all other paths have their own validation
+    const m = encodeMap(enc)
+    const len = input.length
+    const u = new Uint8Array(len)
+    for (let i = 0; i < len; i++) {
+      const x = input.charCodeAt(i)
+      const b = m[x]
+      if (!b && x) {
+        let cp = x
+        const i0 = i
+        if (x >= 0xd8_00 && x < 0xe0_00) {
+          cp = 0xff_fd
+          if (x < 0xdc_00 && i + 1 < len) {
+            const x1 = input.charCodeAt(i + 1)
+            if (x1 >= 0xdc_00 && x1 < 0xe0_00) {
+              cp = 0x1_00_00 + ((x1 & 0x3_ff) | ((x & 0x3_ff) << 10))
+              i++
+            }
+          }
+        }
+
+        res += `${percent(u, last, i0)}%26%23${cp}%3B` // &#cp;
+        last = i + 1 // skip current
+      } else {
+        u[i] = b
+      }
+    }
+
+    res += percent(u, last)
+  }
+
+  return res
+}
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