253 lines
7.9 KiB
Markdown
253 lines
7.9 KiB
Markdown
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## gulp-sourcemaps [![NPM version][npm-image]][npm-url] [![build status][travis-image]][travis-url] [![Test coverage][coveralls-image]][coveralls-url]
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### Usage
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#### Write inline source maps
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Inline source maps are embedded in the source file.
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Example:
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```javascript
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var gulp = require('gulp');
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var plugin1 = require('gulp-plugin1');
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var plugin2 = require('gulp-plugin2');
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var sourcemaps = require('gulp-sourcemaps');
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gulp.task('javascript', function() {
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gulp.src('src/**/*.js')
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.pipe(sourcemaps.init())
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.pipe(plugin1())
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.pipe(plugin2())
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.pipe(sourcemaps.write())
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.pipe(gulp.dest('dist'));
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});
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```
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All plugins between `sourcemaps.init()` and `sourcemaps.write()` need to have support for `gulp-sourcemaps`. You can find a list of such plugins in the [wiki](https://github.com/floridoo/gulp-sourcemaps/wiki/Plugins-with-gulp-sourcemaps-support).
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#### Write external source map files
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To write external source map files, pass a path relative to the destination to `sourcemaps.write()`.
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Example:
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```javascript
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var gulp = require('gulp');
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var plugin1 = require('gulp-plugin1');
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var plugin2 = require('gulp-plugin2');
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var sourcemaps = require('gulp-sourcemaps');
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gulp.task('javascript', function() {
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gulp.src('src/**/*.js')
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.pipe(sourcemaps.init())
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.pipe(plugin1())
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.pipe(plugin2())
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.pipe(sourcemaps.write('../maps'))
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.pipe(gulp.dest('dist'));
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});
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```
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#### Load existing source maps
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To load existing source maps, pass the option `loadMaps: true` to `sourcemaps.init()`.
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Example:
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```javascript
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var gulp = require('gulp');
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var plugin1 = require('gulp-plugin1');
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var plugin2 = require('gulp-plugin2');
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var sourcemaps = require('gulp-sourcemaps');
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gulp.task('javascript', function() {
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gulp.src('src/**/*.js')
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.pipe(sourcemaps.init({loadMaps: true}))
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.pipe(plugin1())
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.pipe(plugin2())
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.pipe(sourcemaps.write())
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.pipe(gulp.dest('dist'));
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});
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```
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#### Handle source files from different directories
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Use the `base` option on `gulp.src` to make sure all files are relative to a common base directory.
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Example:
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```javascript
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var gulp = require('gulp');
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var plugin1 = require('gulp-plugin1');
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var plugin2 = require('gulp-plugin2');
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var sourcemaps = require('gulp-sourcemaps');
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gulp.task('javascript', function() {
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gulp.src(['src/test.js', 'src/testdir/test2.js'], { base: 'src' })
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.pipe(sourcemaps.init())
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.pipe(plugin1())
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.pipe(plugin2())
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.pipe(sourcemaps.write('../maps'))
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.pipe(gulp.dest('dist'));
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});
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```
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### Init Options
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- `loadMaps`
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Set to true to load existing maps for source files. Supports the following:
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- inline source maps
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- source map files referenced by a `sourceMappingURL=` comment
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- source map files with the same name (plus .map) in the same directory
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- `debug`
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Set this to `true` to output debug messages (e.g. about missing source content).
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### Write Options
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- `addComment`
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By default a comment containing / referencing the source map is added. Set this to `false` to disable the comment (e.g. if you want to load the source maps by header).
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Example:
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```javascript
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gulp.task('javascript', function() {
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var stream = gulp.src('src/**/*.js')
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.pipe(sourcemaps.init())
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.pipe(plugin1())
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.pipe(plugin2())
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.pipe(sourcemaps.write('../maps', {addComment: false}))
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.pipe(gulp.dest('dist'));
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});
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```
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- `includeContent`
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By default the source maps include the source code. Pass `false` to use the original files.
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Including the content is the recommended way, because it "just works". When setting this to `false` you have to host the source files and set the correct `sourceRoot`.
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- `sourceRoot`
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Set the path where the source files are hosted (use this when `includeContent` is set to `false`). This is an URL (or subpath) relative to the source map, not a local file system path. If you have sources in different subpaths, an absolute path (from the domain root) pointing to the source file root is recommended, or define it with a function.
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Example:
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```javascript
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gulp.task('javascript', function() {
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var stream = gulp.src('src/**/*.js')
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.pipe(sourcemaps.init())
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.pipe(plugin1())
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.pipe(plugin2())
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.pipe(sourcemaps.write({includeContent: false, sourceRoot: '/src'}))
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.pipe(gulp.dest('dist'));
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});
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```
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Example (using a function):
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```javascript
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gulp.task('javascript', function() {
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var stream = gulp.src('src/**/*.js')
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.pipe(sourcemaps.init())
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.pipe(plugin1())
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.pipe(plugin2())
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.pipe(sourcemaps.write({
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includeContent: false,
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sourceRoot: function(file) {
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return '/src';
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}
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}))
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.pipe(gulp.dest('dist'));
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});
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```
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- `sourceMappingURLPrefix`
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Specify a prefix to be prepended onto the source map URL when writing external source maps. Relative paths will have their leading dots stripped.
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Example:
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```javascript
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gulp.task('javascript', function() {
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var stream = gulp.src('src/**/*.js')
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.pipe(sourcemaps.init())
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.pipe(plugin1())
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.pipe(plugin2())
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.pipe(sourcemaps.write('../maps', {
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sourceMappingURLPrefix: 'https://asset-host.example.com/assets'
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}))
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.pipe(gulp.dest('public/scripts'));
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});
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```
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This will result in a source mapping URL comment like `sourceMappingURL=https://asset-host.example.com/assets/maps/helloworld.js.map`.
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- `sourceMappingURL`
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If you need full control over the source map URL you can pass a function to this option. The output of the function must be the full URL to the source map (in function of the output file).
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Example:
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```javascript
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gulp.task('javascript', function() {
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var stream = gulp.src('src/**/*.js')
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.pipe(sourcemaps.init())
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.pipe(plugin1())
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.pipe(plugin2())
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.pipe(sourcemaps.write('../maps', {
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sourceMappingURL: function(file) {
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return 'https://asset-host.example.com/' + file.relative + '.map';
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}
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}))
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.pipe(gulp.dest('public/scripts'));
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});
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```
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This will result in a source mapping URL comment like `sourceMappingURL=https://asset-host.example.com/helloworld.js.map`.
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- `debug`
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Set this to `true` to output debug messages (e.g. about missing source content).
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### Plugin developers only: How to add source map support to plugins
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- Generate a source map for the transformation the plugin is applying
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- **Important**: Make sure the paths in the generated source map (`file` and `sources`) are relative to `file.base` (e.g. use `file.relative`).
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- Apply this source map to the vinyl `file`. E.g. by using [vinyl-sourcemaps-apply](https://github.com/floridoo/vinyl-sourcemaps-apply).
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This combines the source map of this plugin with the source maps coming from plugins further up the chain.
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- Add your plugin to the [wiki page](https://github.com/floridoo/gulp-sourcemaps/wiki/Plugins-with-gulp-sourcemaps-support)
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#### Example:
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```javascript
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var through = require('through2');
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var applySourceMap = require('vinyl-sourcemaps-apply');
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var myTransform = require('myTransform');
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module.exports = function(options) {
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function transform(file, encoding, callback) {
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// generate source maps if plugin source-map present
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if (file.sourceMap) {
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options.makeSourceMaps = true;
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}
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// do normal plugin logic
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var result = myTransform(file.contents, options);
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file.contents = new Buffer(result.code);
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// apply source map to the chain
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if (file.sourceMap) {
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applySourceMap(file, result.map);
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}
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this.push(file);
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callback();
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}
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return through.obj(transform);
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};
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```
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[npm-image]: https://img.shields.io/npm/v/gulp-sourcemaps.svg
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[npm-url]: https://www.npmjs.com/package/gulp-sourcemaps
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[travis-image]: https://img.shields.io/travis/floridoo/gulp-sourcemaps.svg
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[travis-url]: https://travis-ci.org/floridoo/gulp-sourcemaps
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[coveralls-image]: https://img.shields.io/coveralls/floridoo/gulp-sourcemaps.svg
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[coveralls-url]: https://coveralls.io/r/floridoo/gulp-sourcemaps?branch=master
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