42 lines
1.3 KiB
Markdown
42 lines
1.3 KiB
Markdown
# gulp-tap [](https://travis-ci.org/geejs/gulp-tap) [](https://coveralls.io/github/geejs/gulp-tap?branch=master) [](https://david-dm.org/geejs/gulp-tap)
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Easily tap into a pipeline.
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## Uses
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Some filters like `gulp-coffee` process all files. What if you want to process
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all JS and Coffee files in a single pipeline. Use `tap` to filter out `.coffee`
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files and process them through the `coffee` filter and let JavaScript files
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pass through.
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```js
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gulp.src("src/**/*.{coffee,js}")
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.pipe(tap(function(file, t) {
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if (path.extname(file.path) === '.coffee') {
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return t.through(coffee, []);
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}
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}))
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.pipe(gulp.dest('build'));
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```
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What if you want to change content like add a header? No need for a separate
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filter, just change the content.
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```js
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tap(function(file) {
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file.contents = Buffer.concat([
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new Buffer('HEADER'),
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file.contents
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]);
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});
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```
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If you do not return a stream, tap forwards your changes.
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## Examples
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See [Wiki](https://github.com/geejs/gulp-tap/wiki) for more examples.
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## License
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The MIT License (MIT)
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