80 lines
4.5 KiB
Markdown
80 lines
4.5 KiB
Markdown
<p align="center">
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<a href="http://gulpjs.com">
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<img height="257" width="114" src="https://raw.githubusercontent.com/gulpjs/artwork/master/gulp-2x.png">
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</a>
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</p>
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# vinyl-sourcemap
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[![NPM version][npm-image]][npm-url] [![Downloads][downloads-image]][npm-url] [![Build Status][travis-image]][travis-url] [![AppVeyor Build Status][appveyor-image]][appveyor-url] [![Coveralls Status][coveralls-image]][coveralls-url] [![Gitter chat][gitter-image]][gitter-url]
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Add/write sourcemaps to/from Vinyl files.
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## Usage
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```js
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sourcemap.add(file, function(err, updatedFile) {
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// updatedFile will have a .sourceMap property
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});
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// The 2nd argument can be given as a path string
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sourcemap.write(file, './maps', function(err, updatedFile, sourcemapFile) {
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// sourcemapFile will be a Vinyl file to be written to some location
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// updatedFile will have the .contents property updated with a sourceMappingURL that resolves to sourcemapFile
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});
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// If not defined, the sourcemap is inlined
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sourcemap.write(file, function(err, updatedFile, sourcemapFile) {
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// sourcemapFile is undefined
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// updatedFile will have the .contents property updated with a sourceMappingURL that is an inlined sourcemap
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});
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```
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## API
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### `sourcemap.add(file, callback)`
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Takes a [Vinyl][vinyl] `file` object and a `callback` function. It attempts to parse an inline sourcemap or load an external sourcemap for the file. If a valid sourcemap is found, the `sources` & `sourcesContent` properties are resolved to actual files (if possible) and a fully resolved sourcemap is attached as `file.sourceMap`. If a sourcemap is not found, a stub sourcemap is generated for the file and attached as `file.sourceMap`.
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Once all resolution is complete, the `callback(err, updatedFile)` is called with the `updatedFile`. If an error occurs, it will be passed as `err` and `updatedFile` will be undefined. __Note:__ The original file is mutated but `updatedFile` is passed to the callback as a convenience.
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If the `file` is not a Vinyl object or the contents are streaming, an Error will be passed to the `callback`.
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If the `file` has a `.sourceMap` property or the contents are null, the `callback` will be called immediately without mutation to the file.
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All filesystem operations are optional & non-fatal so any errors will not be bubbled to the `callback`.
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### `sourcemap.write(file, [outputPath,] callback)`
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Takes a [Vinyl][vinyl] `file` object, (optionally) an `outputPath` string and a `callback` function.
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If `outputPath` is not passed, an inline sourcemap will be generated from the `file.sourceMap` property and appended to the `file.contents`. Once the inline sourcemap is appended, the `callback(err, updatedFile)` is called with the `updatedFile`. If an error occurs, it will be passed as `err` and `updatedFile` will be undefined. __Note:__ The original file is mutated but `updatedFile` is passed to the callback as a convenience.
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If `outputPath` is passed, a new Vinyl file will be generated using `file.cwd` and `file.base` from the original file, the path to the external sourcemap, and the `file.sourceMap` (as contents). The external location will be appended to the `file.contents` of the original file. Once the new file is created and location appended, the `callback(err, updatedFile, sourcemapFile)` is called with the `updatedFile` and the `sourcemapFile`. If an error occurs, it will be passed as `err` and `updatedFile`/`sourcemapFile` will be undefined. __Note:__ The original file is mutated but `updatedFile` is passed to the callback as a convenience.
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If the `file` is not a Vinyl object or the contents are streaming, an Error will be passed to the `callback`.
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If the `file` doesn't have a `.sourceMap` property or the contents are null, the `callback` will be called immediately without mutation to the file.
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## License
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MIT
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[vinyl]: https://github.com/gulpjs/vinyl
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[downloads-image]: http://img.shields.io/npm/dm/vinyl-sourcemap.svg
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[npm-url]: https://npmjs.com/package/vinyl-sourcemap
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[npm-image]: http://img.shields.io/npm/v/vinyl-sourcemap.svg
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[travis-url]: https://travis-ci.org/gulpjs/vinyl-sourcemap
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[travis-image]: http://img.shields.io/travis/gulpjs/vinyl-sourcemap.svg?label=travis-ci
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[appveyor-url]: https://ci.appveyor.com/project/gulpjs/vinyl-sourcemap
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[appveyor-image]: https://img.shields.io/appveyor/ci/gulpjs/vinyl-sourcemap.svg?label=appveyor
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[coveralls-url]: https://coveralls.io/r/gulpjs/vinyl-sourcemap
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[coveralls-image]: http://img.shields.io/coveralls/gulpjs/vinyl-sourcemap/master.svg
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[gitter-url]: https://gitter.im/gulpjs/gulp
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[gitter-image]: https://badges.gitter.im/gulpjs/gulp.png
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