4.4 KiB
Settings
There are a number of options available. Please review the minimatch options here. As well as some additional options as follows:
files
Type: String|Array
This defines what file patterns this task will watch. Can be a string or an array of files and/or minimatch patterns.
tasks
Type: String|Array
This defines which tasks to run when a watched file event occurs.
options.spawn
Type: Boolean
Default: true
Whether to spawn task runs in a child process. Setting this option to false speeds up the reaction time of the watch (usually 500ms faster for most) and allows subsequent task runs to share the same context. Not spawning task runs can make the watch more prone to failing so please use as needed.
Example:
watch: {
scripts: {
files: ['**/*.js'],
tasks: ['jshint'],
options: {
spawn: false,
},
},
},
For backwards compatibility the option nospawn is still available and will do the opposite of spawn.
options.interrupt
Type: Boolean
Default: false
As files are modified this watch task will spawn tasks in child processes. The default behavior will only spawn a new child process per target when the previous process has finished. Set the interrupt option to true to terminate the previous process and spawn a new one upon later changes.
Example:
watch: {
scripts: {
files: '**/*.js',
tasks: ['jshint'],
options: {
interrupt: true,
},
},
},
options.debounceDelay
Type: Integer
Default: 500
How long to wait before emitting events in succession for the same filepath and status. For example if your Gruntfile.js file was changed, a changed event will only fire again after the given milliseconds.
Example:
watch: {
scripts: {
files: '**/*.js',
tasks: ['jshint'],
options: {
debounceDelay: 250,
},
},
},
options.interval
Type: Integer
Default: 100
The interval is passed to fs.watchFile. Since interval is only used by fs.watchFile and this watcher also uses fs.watch; it is recommended to ignore this option. Default is 100ms.
options.event
Type: String|Array
Default: 'all'
Specify the type watch event that trigger the specified task. This option can be one or many of: 'all', 'changed', 'added' and 'deleted'.
Example:
watch: {
scripts: {
files: '**/*.js',
tasks: ['generateFileManifest'],
options: {
event: ['added', 'deleted'],
},
},
},
options.forever
Type: Boolean
Default: true
This is only a task level option and cannot be configured per target. By default the watch task will duck punch grunt.fatal and grunt.warn to try and prevent them from exiting the watch process. If you don't want grunt.fatal and grunt.warn to be overridden set the forever option to false.
options.dateFormat
Type: Function
This is only a task level option and cannot be configured per target. By default when the watch has finished running tasks it will display the message Completed in 1.301s at Thu Jul 18 2013 14:58:21 GMT-0700 (PDT) - Waiting.... You can override this message by supplying your own function:
watch: {
options: {
dateFormat: function(time) {
grunt.log.writeln('The watch finished in ' + time + 'ms at' + (new Date()).toString());
grunt.log.writeln('Waiting for more changes...');
},
},
scripts: {
files: '**/*.js',
tasks: 'jshint',
},
},
options.atBegin
Type: Boolean
Default: false
This option will trigger the run of each specified task at startup of the watcher.
options.livereload
Type: Boolean|Number|Object
Default: false
Set to true or set livereload: 1337 to a port number to enable live reloading. Default and recommended port is 35729.
If enabled a live reload server will be started with the watch task per target. Then after the indicated tasks have ran, the live reload server will be triggered with the modified files.
Example:
watch: {
css: {
files: '**/*.sass',
tasks: ['sass'],
options: {
livereload: true,
},
},
},
options.cwd
Type: String|Object
Default: process.cwd()
Ability to set the current working directory. Defaults to process.cwd(). Can either be a string to set the cwd to match files and spawn tasks. Or an object to set each independently. Such as options: { cwd: { files: 'match/files/from/here', spawn: 'but/spawn/files/from/here' } }.