> For the complete documentation index, see [llms.txt](https://bryan-guner.gitbook.io/my-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bryan-guner.gitbook.io/my-docs/redux/repos/examples/real-world/node_modules/source-map-url.md).

# source-map-url

## Overview [![Build Status](https://travis-ci.org/lydell/source-map-url.png?branch=master)](https://travis-ci.org/lydell/source-map-url)

[![browser support](https://ci.testling.com/lydell/source-map-url.png)](https://ci.testling.com/lydell/source-map-url)

Tools for working with sourceMappingURL comments.

```js
var sourceMappingURL = require("source-map-url")

var code = [
  "!function(){...}();",
  "/*# sourceMappingURL=foo.js.map */"
].join("\n")

sourceMappingURL.existsIn(code)
// true

sourceMappingURL.getFrom(code)
// foo.js.map

code = sourceMappingURL.insertBefore(code, "// License: MIT\n")
// !function(){...}();
// // License: MIT
// /*# sourceMappingURL=foo.js.map */

code = sourceMappingURL.removeFrom(code)
// !function(){...}();
// // License: MIT

sourceMappingURL.existsIn(code)
// false

sourceMappingURL.getFrom(code)
// null

code += "//# sourceMappingURL=/other/file.js.map"
// !function(){...}();
// // License: MIT
// //# sourceMappingURL=/other/file.js.map
```

## Installation

* `npm install source-map-url`
* `bower install source-map-url`
* `component install lydell/source-map-url`

Works with CommonJS, AMD and browser globals, through UMD.

## Usage

#### `sourceMappingURL.getFrom(code)`

Returns the url of the sourceMappingURL comment in `code`. Returns `null` if there is no such comment.

#### `sourceMappingURL.existsIn(code)`

Returns `true` if there is a sourceMappingURL comment in `code`, or `false` otherwise.

#### `sourceMappingURL.removeFrom(code)`

Removes the sourceMappingURL comment in `code`. Does nothing if there is no such comment. Returns the updated `code`.

#### `sourceMappingURL.insertBefore(code, string)`

Inserts `string` before the sourceMappingURL comment in `code`. Appends `string` to `code` if there is no such comment.

Lets you append something to a file without worrying about burying the sourceMappingURL comment (by keeping it at the end of the file).

#### `sourceMappingURL.regex`

The regex that is used to match sourceMappingURL comments. It matches both `//` and `/**/` comments, thus supporting both JavaScript and CSS.

## Tests

Start by running `npm test`, which lints the code and runs the test suite in Node.js.

To run the tests in a browser, run `testling` (`npm install -g testling`) or `testling -u`.

## License

[The X11 (“MIT”) License](https://github.com/bgoonz/Learning-Redux/blob/master/repos/examples/real-world/node_modules/source-map-url/LICENSE/README.md).


---

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