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+# convert-source-map [![Build Status][ci-image]][ci-url]
+
+Converts a source-map from/to  different formats and allows adding/changing properties.
+
+```js
+var convert = require('convert-source-map');
+
+var json = convert
+  .fromComment('//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjoiYnVpbGQvZm9vLm1pbi5qcyIsInNvdXJjZXMiOlsic3JjL2Zvby5qcyJdLCJuYW1lcyI6W10sIm1hcHBpbmdzIjoiQUFBQSIsInNvdXJjZVJvb3QiOiIvIn0=')
+  .toJSON();
+
+var modified = convert
+  .fromComment('//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjoiYnVpbGQvZm9vLm1pbi5qcyIsInNvdXJjZXMiOlsic3JjL2Zvby5qcyJdLCJuYW1lcyI6W10sIm1hcHBpbmdzIjoiQUFBQSIsInNvdXJjZVJvb3QiOiIvIn0=')
+  .setProperty('sources', [ 'SRC/FOO.JS' ])
+  .toJSON();
+
+console.log(json);
+console.log(modified);
+```
+
+```json
+{"version":3,"file":"build/foo.min.js","sources":["src/foo.js"],"names":[],"mappings":"AAAA","sourceRoot":"/"}
+{"version":3,"file":"build/foo.min.js","sources":["SRC/FOO.JS"],"names":[],"mappings":"AAAA","sourceRoot":"/"}
+```
+
+## Upgrading
+
+Prior to v2.0.0, the `fromMapFileComment` and `fromMapFileSource` functions took a String directory path and used that to resolve & read the source map file from the filesystem. However, this made the library limited to nodejs environments and broke on sources with querystrings.
+
+In v2.0.0, you now need to pass a function that does the file reading. It will receive the source filename as a String that you can resolve to a filesystem path, URL, or anything else.
+
+If you are using `convert-source-map` in nodejs and want the previous behavior, you'll use a function like such:
+
+```diff
++ var fs = require('fs'); // Import the fs module to read a file
++ var path = require('path'); // Import the path module to resolve a path against your directory
+- var conv = convert.fromMapFileSource(css, '../my-dir');
++ var conv = convert.fromMapFileSource(css, function (filename) {
++   return fs.readFileSync(path.resolve('../my-dir', filename), 'utf-8');
++ });
+```
+
+## API
+
+### fromObject(obj)
+
+Returns source map converter from given object.
+
+### fromJSON(json)
+
+Returns source map converter from given json string.
+
+### fromURI(uri)
+
+Returns source map converter from given uri encoded json string.
+
+### fromBase64(base64)
+
+Returns source map converter from given base64 encoded json string.
+
+### fromComment(comment)
+
+Returns source map converter from given base64 or uri encoded json string prefixed with `//# sourceMappingURL=...`.
+
+### fromMapFileComment(comment, readMap)
+
+Returns source map converter from given `filename` by parsing `//# sourceMappingURL=filename`.
+
+`readMap` must be a function which receives the source map filename and returns either a String or Buffer of the source map (if read synchronously), or a `Promise` containing a String or Buffer of the source map (if read asynchronously).
+
+If `readMap` doesn't return a `Promise`, `fromMapFileComment` will return a source map converter synchronously.
+
+If `readMap` returns a `Promise`, `fromMapFileComment` will also return `Promise`. The `Promise` will be either resolved with the source map converter or rejected with an error.
+
+#### Examples
+
+**Synchronous read in Node.js:**
+
+```js
+var convert = require('convert-source-map');
+var fs = require('fs');
+
+function readMap(filename) {
+  return fs.readFileSync(filename, 'utf8');
+}
+
+var json = convert
+  .fromMapFileComment('//# sourceMappingURL=map-file-comment.css.map', readMap)
+  .toJSON();
+console.log(json);
+```
+
+
+**Asynchronous read in Node.js:**
+
+```js
+var convert = require('convert-source-map');
+var { promises: fs } = require('fs'); // Notice the `promises` import
+
+function readMap(filename) {
+  return fs.readFile(filename, 'utf8');
+}
+
+var converter = await convert.fromMapFileComment('//# sourceMappingURL=map-file-comment.css.map', readMap)
+var json = converter.toJSON();
+console.log(json);
+```
+
+**Asynchronous read in the browser:**
+
+```js
+var convert = require('convert-source-map');
+
+async function readMap(url) {
+  const res = await fetch(url);
+  return res.text();
+}
+
+const converter = await convert.fromMapFileComment('//# sourceMappingURL=map-file-comment.css.map', readMap)
+var json = converter.toJSON();
+console.log(json);
+```
+
+### fromSource(source)
+
+Finds last sourcemap comment in file and returns source map converter or returns `null` if no source map comment was found.
+
+### fromMapFileSource(source, readMap)
+
+Finds last sourcemap comment in file and returns source map converter or returns `null` if no source map comment was found.
+
+`readMap` must be a function which receives the source map filename and returns either a String or Buffer of the source map (if read synchronously), or a `Promise` containing a String or Buffer of the source map (if read asynchronously).
+
+If `readMap` doesn't return a `Promise`, `fromMapFileSource` will return a source map converter synchronously.
+
+If `readMap` returns a `Promise`, `fromMapFileSource` will also return `Promise`. The `Promise` will be either resolved with the source map converter or rejected with an error.
+
+### toObject()
+
+Returns a copy of the underlying source map.
+
+### toJSON([space])
+
+Converts source map to json string. If `space` is given (optional), this will be passed to
+[JSON.stringify](https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/JSON/stringify) when the
+JSON string is generated.
+
+### toURI()
+
+Converts source map to uri encoded json string.
+
+### toBase64()
+
+Converts source map to base64 encoded json string.
+
+### toComment([options])
+
+Converts source map to an inline comment that can be appended to the source-file.
+
+By default, the comment is formatted like: `//# sourceMappingURL=...`, which you would
+normally see in a JS source file.
+
+When `options.encoding == 'uri'`, the data will be uri encoded, otherwise they will be base64 encoded.
+
+When `options.multiline == true`, the comment is formatted like: `/*# sourceMappingURL=... */`, which you would find in a CSS source file.
+
+### addProperty(key, value)
+
+Adds given property to the source map. Throws an error if property already exists.
+
+### setProperty(key, value)
+
+Sets given property to the source map. If property doesn't exist it is added, otherwise its value is updated.
+
+### getProperty(key)
+
+Gets given property of the source map.
+
+### removeComments(src)
+
+Returns `src` with all source map comments removed
+
+### removeMapFileComments(src)
+
+Returns `src` with all source map comments pointing to map files removed.
+
+### commentRegex
+
+Provides __a fresh__ RegExp each time it is accessed. Can be used to find source map comments.
+
+Breaks down a source map comment into groups: Groups: 1: media type, 2: MIME type, 3: charset, 4: encoding, 5: data.
+
+### mapFileCommentRegex
+
+Provides __a fresh__ RegExp each time it is accessed. Can be used to find source map comments pointing to map files.
+
+### generateMapFileComment(file, [options])
+
+Returns a comment that links to an external source map via `file`.
+
+By default, the comment is formatted like: `//# sourceMappingURL=...`, which you would normally see in a JS source file.
+
+When `options.multiline == true`, the comment is formatted like: `/*# sourceMappingURL=... */`, which you would find in a CSS source file.
+
+[ci-url]: https://github.com/thlorenz/convert-source-map/actions?query=workflow:ci
+[ci-image]: https://img.shields.io/github/workflow/status/thlorenz/convert-source-map/CI?style=flat-square