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https://github.com/browserify/watchify
watch mode for browserify builds
https://github.com/browserify/watchify
Last synced: 2 days ago
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watch mode for browserify builds
- Host: GitHub
- URL: https://github.com/browserify/watchify
- Owner: browserify
- License: other
- Created: 2013-05-30T08:55:38.000Z (over 11 years ago)
- Default Branch: master
- Last Pushed: 2022-02-24T03:04:35.000Z (over 2 years ago)
- Last Synced: 2024-10-30T08:48:22.623Z (9 days ago)
- Language: JavaScript
- Size: 171 KB
- Stars: 1,790
- Watchers: 22
- Forks: 203
- Open Issues: 39
-
Metadata Files:
- Readme: readme.markdown
- Changelog: CHANGELOG.md
- License: LICENSE
Awesome Lists containing this project
- awesome-starred - browserify/watchify - watch mode for browserify builds (others)
README
# watchify
watch mode for [browserify](https://github.com/substack/node-browserify) builds
[![build status](https://secure.travis-ci.org/browserify/watchify.svg?branch=master)](http://travis-ci.org/browserify/watchify)
Update any source file and your browserify bundle will be recompiled on the
spot.# example
```
$ watchify main.js -o static/bundle.js
```Now as you update files, `static/bundle.js` will be automatically
incrementally rebuilt on the fly.The `-o` option can be a file or a shell command (not available on Windows)
that receives piped input:``` sh
watchify main.js -o 'exorcist static/bundle.js.map > static/bundle.js' -d
`````` sh
watchify main.js -o 'uglifyjs -cm > static/bundle.min.js'
```You can use `-v` to get more verbose output to show when a file was written and how long the bundling took (in seconds):
```
$ watchify browser.js -d -o static/bundle.js -v
610598 bytes written to static/bundle.js (0.23 seconds) at 8:31:25 PM
610606 bytes written to static/bundle.js (0.10 seconds) at 8:45:59 PM
610597 bytes written to static/bundle.js (0.14 seconds) at 8:46:02 PM
610606 bytes written to static/bundle.js (0.08 seconds) at 8:50:13 PM
610597 bytes written to static/bundle.js (0.08 seconds) at 8:58:16 PM
610597 bytes written to static/bundle.js (0.19 seconds) at 9:10:45 PM
```# usage
Use `watchify` with all the same options as `browserify` except that `-o` (or
`--outfile`) is mandatory. Additionally, there are also:```
Standard Options:--outfile=FILE, -o FILE
This option is required. Write the browserify bundle to this file. If
the file contains the operators `|` or `>`, it will be treated as a
shell command, and the output will be piped to it.--verbose, -v [default: false]
Show when a file was written and how long the bundling took (in
seconds).--version
Show the watchify and browserify versions with their module paths.
``````
Advanced Options:--delay [default: 100]
Amount of time in milliseconds to wait before emitting an "update"
event after a change.--ignore-watch=GLOB, --iw GLOB [default: false]
Ignore monitoring files for changes that match the pattern. Omitting
the pattern will default to "**/node_modules/**".--poll=INTERVAL [default: false]
Use polling to monitor for changes. Omitting the interval will default
to 100ms. This option is useful if you're watching an NFS volume.
```# methods
``` js
var watchify = require('watchify');
```## watchify(b, opts)
watchify is a browserify [plugin](https://github.com/browserify/browserify#bpluginplugin-opts), so it can be applied like any other plugin.
However, when creating the browserify instance `b`, **you MUST set the `cache`
and `packageCache` properties**:``` js
var b = browserify({ cache: {}, packageCache: {} });
b.plugin(watchify);
``````js
var b = browserify({
cache: {},
packageCache: {},
plugin: [watchify]
});
```**By default, watchify doesn't display any output, see [events](https://github.com/browserify/watchify#events) for more info.**
`b` continues to behave like a browserify instance except that it caches file
contents and emits an `'update'` event when a file changes. You should call
`b.bundle()` after the `'update'` event fires to generate a new bundle.
Calling `b.bundle()` extra times past the first time will be much faster due
to caching.**Important:** Watchify will not emit `'update'` events until you've called
`b.bundle()` once and completely drained the stream it returns.```js
var fs = require('fs');
var browserify = require('browserify');
var watchify = require('watchify');var b = browserify({
entries: ['path/to/entry.js'],
cache: {},
packageCache: {},
plugin: [watchify]
});b.on('update', bundle);
bundle();function bundle() {
b.bundle()
.on('error', console.error)
.pipe(fs.createWriteStream('output.js'))
;
}
```### options
You can to pass an additional options object as a second parameter of
watchify. Its properties are:`opts.delay` is the amount of time in milliseconds to wait before emitting
an "update" event after a change. Defaults to `100`.`opts.ignoreWatch` ignores monitoring files for changes. If set to `true`,
then `**/node_modules/**` will be ignored. For other possible values see
Chokidar's [documentation](https://github.com/paulmillr/chokidar#path-filtering) on "ignored".`opts.poll` enables polling to monitor for changes. If set to `true`, then
a polling interval of 100ms is used. If set to a number, then that amount of
milliseconds will be the polling interval. For more info see Chokidar's
[documentation](https://github.com/paulmillr/chokidar#performance) on
"usePolling" and "interval".
**This option is useful if you're watching an NFS volume.**```js
var b = browserify({ cache: {}, packageCache: {} });
// watchify defaults:
b.plugin(watchify, {
delay: 100,
ignoreWatch: ['**/node_modules/**'],
poll: false
});
```## b.close()
Close all the open watch handles.
# events
## b.on('update', function (ids) {})
When the bundle changes, emit the array of bundle `ids` that changed.
## b.on('bytes', function (bytes) {})
When a bundle is generated, this event fires with the number of bytes.
## b.on('time', function (time) {})
When a bundle is generated, this event fires with the time it took to create the
bundle in milliseconds.## b.on('log', function (msg) {})
This event fires after a bundle was created with messages of the form:
```
X bytes written (Y seconds)
```with the number of bytes in the bundle X and the time in seconds Y.
# working with browserify transforms
If your custom transform for browserify adds new files to the bundle in a non-standard way without requiring.
You can inform Watchify about these files by emiting a 'file' event.```
module.exports = function(file) {
return through(
function(buf, enc, next) {
/*
manipulating file content
*/
this.emit("file", absolutePathToFileThatHasToBeWatched);
next();
}
);
};
```# install
With [npm](https://npmjs.org) do:
```
$ npm install -g watchify
```to get the watchify command and:
```
$ npm install watchify
```to get just the library.
# troubleshooting
## rebuilds on OS X never trigger
It may be related to a bug in `fsevents` (see [#250](https://github.com/browserify/watchify/issues/205#issuecomment-98672850)
and [stackoverflow](http://stackoverflow.com/questions/26708205/webpack-watch-isnt-compiling-changed-files/28610124#28610124)).
Try the `--poll` flag
and/or renaming the project's directory - that might help.## watchify swallows errors
To ensure errors are reported you have to add a event listener to your bundle stream. For more information see ([browserify/browserify#1487 (comment)](https://github.com/browserify/browserify/issues/1487#issuecomment-173357516) and [stackoverflow](https://stackoverflow.com/a/22389498/1423220))
**Example:**
```
var b = browserify();
b.bundle()
.on('error', console.error)
...
;
```# see also
- [budo](https://www.npmjs.com/package/budo) – a simple development server built on watchify
- [errorify](https://www.npmjs.com/package/errorify) – a plugin to add error handling to watchify development
- [watchify-request](https://www.npmjs.com/package/watchify-request) – wraps a `watchify` instance to avoid stale bundles in HTTP requests
- [watchify-middleware](https://www.npmjs.com/package/watchify-middleware) – similar to `watchify-request`, but includes some higher-level features# license
MIT