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+# magic-string
+
+<a href="https://github.com/Rich-Harris/magic-string/actions/workflows/test.yml">
+  <img src="https://img.shields.io/github/actions/workflow/status/Rich-Harris/magic-string/test.yml"
+       alt="build status">
+</a>
+<a href="https://npmjs.org/package/magic-string">
+  <img src="https://img.shields.io/npm/v/magic-string.svg"
+       alt="npm version">
+</a>
+<a href="https://github.com/Rich-Harris/magic-string/blob/master/LICENSE.md">
+  <img src="https://img.shields.io/npm/l/magic-string.svg"
+       alt="license">
+</a>
+
+Suppose you have some source code. You want to make some light modifications to it - replacing a few characters here and there, wrapping it with a header and footer, etc - and ideally you'd like to generate a [source map](https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/) at the end of it. You've thought about using something like [recast](https://github.com/benjamn/recast) (which allows you to generate an AST from some JavaScript, manipulate it, and reprint it with a sourcemap without losing your comments and formatting), but it seems like overkill for your needs (or maybe the source code isn't JavaScript).
+
+Your requirements are, frankly, rather niche. But they're requirements that I also have, and for which I made magic-string. It's a small, fast utility for manipulating strings and generating sourcemaps.
+
+## Installation
+
+magic-string works in both node.js and browser environments. For node, install with npm:
+
+```bash
+npm i magic-string
+```
+
+To use in browser, grab the [magic-string.umd.js](https://unpkg.com/magic-string/dist/magic-string.umd.js) file and add it to your page:
+
+```html
+<script src="magic-string.umd.js"></script>
+```
+
+(It also works with various module systems, if you prefer that sort of thing - it has a dependency on [vlq](https://github.com/Rich-Harris/vlq).)
+
+## Usage
+
+These examples assume you're in node.js, or something similar:
+
+```js
+import MagicString from 'magic-string';
+import fs from 'fs';
+
+const s = new MagicString('problems = 99');
+
+s.update(0, 8, 'answer');
+s.toString(); // 'answer = 99'
+
+s.update(11, 13, '42'); // character indices always refer to the original string
+s.toString(); // 'answer = 42'
+
+s.prepend('var ').append(';'); // most methods are chainable
+s.toString(); // 'var answer = 42;'
+
+const map = s.generateMap({
+	source: 'source.js',
+	file: 'converted.js.map',
+	includeContent: true,
+}); // generates a v3 sourcemap
+
+fs.writeFileSync('converted.js', s.toString());
+fs.writeFileSync('converted.js.map', map.toString());
+```
+
+You can pass an options argument:
+
+```js
+const s = new MagicString(someCode, {
+	// these options will be used if you later call `bundle.addSource( s )` - see below
+	filename: 'foo.js',
+	indentExclusionRanges: [
+		/*...*/
+	],
+	// mark source as ignore in DevTools, see below #Bundling
+	ignoreList: false,
+	// adjust the incoming position - see below
+	offset: 0,
+});
+```
+
+## Properties
+
+### s.offset
+
+Sets the offset property to adjust the incoming position for the following APIs: `slice`, `update`, `overwrite`, `appendLeft`, `prependLeft`, `appendRight`, `prependRight`, `move`, `reset`, and `remove`.
+
+Example usage:
+
+```ts
+const s = new MagicString('hello world', { offset: 0 });
+s.offset = 6;
+s.slice() === 'world';
+```
+
+## Methods
+
+### s.addSourcemapLocation( index )
+
+Adds the specified character index (with respect to the original string) to sourcemap mappings, if `hires` is `false` (see below).
+
+### s.append( content )
+
+Appends the specified content to the end of the string. Returns `this`.
+
+### s.appendLeft( index, content )
+
+Appends the specified `content` at the `index` in the original string. If a range _ending_ with `index` is subsequently moved, the insert will be moved with it. Returns `this`. See also `s.prependLeft(...)`.
+
+### s.appendRight( index, content )
+
+Appends the specified `content` at the `index` in the original string. If a range _starting_ with `index` is subsequently moved, the insert will be moved with it. Returns `this`. See also `s.prependRight(...)`.
+
+### s.clone()
+
+Does what you'd expect.
+
+### s.generateDecodedMap( options )
+
+Generates a sourcemap object with raw mappings in array form, rather than encoded as a string. See `generateMap` documentation below for options details. Useful if you need to manipulate the sourcemap further, but most of the time you will use `generateMap` instead.
+
+### s.generateMap( options )
+
+Generates a [version 3 sourcemap](https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit). All options are, well, optional:
+
+- `file` - the filename where you plan to write the sourcemap
+- `source` - the filename of the file containing the original source
+- `includeContent` - whether to include the original content in the map's `sourcesContent` array
+- `hires` - whether the mapping should be high-resolution. Hi-res mappings map every single character, meaning (for example) your devtools will always be able to pinpoint the exact location of function calls and so on. With lo-res mappings, devtools may only be able to identify the correct line - but they're quicker to generate and less bulky. You can also set `"boundary"` to generate a semi-hi-res mappings segmented per word boundary instead of per character, suitable for string semantics that are separated by words. If sourcemap locations have been specified with `s.addSourcemapLocation()`, they will be used here.
+
+The returned sourcemap has two (non-enumerable) methods attached for convenience:
+
+- `toString` - returns the equivalent of `JSON.stringify(map)`
+- `toUrl` - returns a DataURI containing the sourcemap. Useful for doing this sort of thing:
+
+```js
+code += '\n//# sourceMappingURL=' + map.toUrl();
+```
+
+### s.hasChanged()
+
+Indicates if the string has been changed.
+
+### s.indent( prefix[, options] )
+
+Prefixes each line of the string with `prefix`. If `prefix` is not supplied, the indentation will be guessed from the original content, falling back to a single tab character. Returns `this`.
+
+The `options` argument can have an `exclude` property, which is an array of `[start, end]` character ranges. These ranges will be excluded from the indentation - useful for (e.g.) multiline strings.
+
+### s.insertLeft( index, content )
+
+**DEPRECATED** since 0.17 – use `s.appendLeft(...)` instead
+
+### s.insertRight( index, content )
+
+**DEPRECATED** since 0.17 – use `s.prependRight(...)` instead
+
+### s.isEmpty()
+
+Returns true if the resulting source is empty (disregarding white space).
+
+### s.locate( index )
+
+**DEPRECATED** since 0.10 – see [#30](https://github.com/Rich-Harris/magic-string/pull/30)
+
+### s.locateOrigin( index )
+
+**DEPRECATED** since 0.10 – see [#30](https://github.com/Rich-Harris/magic-string/pull/30)
+
+### s.move( start, end, index )
+
+Moves the characters from `start` and `end` to `index`. Returns `this`.
+
+### s.overwrite( start, end, content[, options] )
+
+Replaces the characters from `start` to `end` with `content`, along with the appended/prepended content in that range. The same restrictions as `s.remove()` apply. Returns `this`.
+
+The fourth argument is optional. It can have a `storeName` property — if `true`, the original name will be stored for later inclusion in a sourcemap's `names` array — and a `contentOnly` property which determines whether only the content is overwritten, or anything that was appended/prepended to the range as well.
+
+It may be preferred to use `s.update(...)` instead if you wish to avoid overwriting the appended/prepended content.
+
+### s.prepend( content )
+
+Prepends the string with the specified content. Returns `this`.
+
+### s.prependLeft ( index, content )
+
+Same as `s.appendLeft(...)`, except that the inserted content will go _before_ any previous appends or prepends at `index`
+
+### s.prependRight ( index, content )
+
+Same as `s.appendRight(...)`, except that the inserted content will go _before_ any previous appends or prepends at `index`
+
+### s.replace( regexpOrString, substitution )
+
+String replacement with RegExp or string. The `substitution` parameter supports strings and functions. Returns `this`.
+
+```ts
+import MagicString from 'magic-string';
+
+const s = new MagicString(source);
+
+s.replace('foo', 'bar');
+s.replace('foo', (str, index, s) => str + '-' + index);
+s.replace(/foo/g, 'bar');
+s.replace(/(\w)(\d+)/g, (_, $1, $2) => $1.toUpperCase() + $2);
+```
+
+The differences from [`String.replace`](<(https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace)>):
+
+- It will always match against the **original string**
+- It mutates the magic string state (use `.clone()` to be immutable)
+
+### s.replaceAll( regexpOrString, substitution )
+
+Same as `s.replace`, but replace all matched strings instead of just one.
+If `regexpOrString` is a regex, then it must have the global (`g`) flag set, or a `TypeError` is thrown. Matches the behavior of the builtin [`String.property.replaceAll`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replaceAll). Returns `this`.
+
+### s.remove( start, end )
+
+Removes the characters from `start` to `end` (of the original string, **not** the generated string). Removing the same content twice, or making removals that partially overlap, will cause an error. Returns `this`.
+
+### s.reset( start, end )
+
+Resets the characters from `start` to `end` (of the original string, **not** the generated string).
+It can be used to restore previously removed characters and discard unwanted changes.
+
+### s.slice( start, end )
+
+Returns the content of the generated string that corresponds to the slice between `start` and `end` of the original string. Throws error if the indices are for characters that were already removed.
+
+### s.snip( start, end )
+
+Returns a clone of `s`, with all content before the `start` and `end` characters of the original string removed.
+
+### s.toString()
+
+Returns the generated string.
+
+### s.trim([ charType ])
+
+Trims content matching `charType` (defaults to `\s`, i.e. whitespace) from the start and end. Returns `this`.
+
+### s.trimStart([ charType ])
+
+Trims content matching `charType` (defaults to `\s`, i.e. whitespace) from the start. Returns `this`.
+
+### s.trimEnd([ charType ])
+
+Trims content matching `charType` (defaults to `\s`, i.e. whitespace) from the end. Returns `this`.
+
+### s.trimLines()
+
+Removes empty lines from the start and end. Returns `this`.
+
+### s.update( start, end, content[, options] )
+
+Replaces the characters from `start` to `end` with `content`. The same restrictions as `s.remove()` apply. Returns `this`.
+
+The fourth argument is optional. It can have a `storeName` property — if `true`, the original name will be stored for later inclusion in a sourcemap's `names` array — and an `overwrite` property which defaults to `false` and determines whether anything that was appended/prepended to the range will be overwritten along with the original content.
+
+`s.update(start, end, content)` is equivalent to `s.overwrite(start, end, content, { contentOnly: true })`.
+
+## Bundling
+
+To concatenate several sources, use `MagicString.Bundle`:
+
+```js
+const bundle = new MagicString.Bundle();
+
+bundle.addSource({
+	filename: 'foo.js',
+	content: new MagicString('var answer = 42;'),
+});
+
+bundle.addSource({
+	filename: 'bar.js',
+	content: new MagicString('console.log( answer )'),
+});
+
+// Sources can be marked as ignore-listed, which provides a hint to debuggers
+// to not step into this code and also don't show the source files depending
+// on user preferences.
+bundle.addSource({
+	filename: 'some-3rdparty-library.js',
+	content: new MagicString('function myLib(){}'),
+	ignoreList: false, // <--
+});
+
+// Advanced: a source can include an `indentExclusionRanges` property
+// alongside `filename` and `content`. This will be passed to `s.indent()`
+// - see documentation above
+
+bundle
+	.indent() // optionally, pass an indent string, otherwise it will be guessed
+	.prepend('(function () {\n')
+	.append('}());');
+
+bundle.toString();
+// (function () {
+//   var answer = 42;
+//   console.log( answer );
+// }());
+
+// options are as per `s.generateMap()` above
+const map = bundle.generateMap({
+	file: 'bundle.js',
+	includeContent: true,
+	hires: true,
+});
+```
+
+As an alternative syntax, if you a) don't have `filename` or `indentExclusionRanges` options, or b) passed those in when you used `new MagicString(...)`, you can simply pass the `MagicString` instance itself:
+
+```js
+const bundle = new MagicString.Bundle();
+const source = new MagicString(someCode, {
+	filename: 'foo.js',
+});
+
+bundle.addSource(source);
+```
+
+## License
+
+MIT