Overview

Tools for working with sourceMappingURL comments.

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

### <tt>sourceMappingURL.getFrom(code)</tt>

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

### <tt>sourceMappingURL.existsIn(code)</tt>

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

### <tt>sourceMappingURL.removeFrom(code)</tt>

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

### <tt>sourceMappingURL.insertBefore(code, string)</tt>

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).

### <tt>sourceMappingURL.regex</tt>

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](LICENSE).