launch a web worker that can require() in the browser with browserify
npm install webworkifylaunch a web worker that can require() in the browser with browserify
First, a main.js file will launch the worker.js and print its output:
`` js
var work = require('webworkify');
var w = work(require('./worker.js'));
w.addEventListener('message', function (ev) {
console.log(ev.data);
});
w.postMessage(4); // send the worker a message
`
then worker.js can require() modules of its own. The worker function livesmodule.exports
inside of the :
` js
var gamma = require('gamma');
module.exports = function (self) {
self.addEventListener('message',function (ev){
var startNum = parseInt(ev.data); // ev.data=4 from main.js
setInterval(function () {
var r = startNum / Math.random() - 1;
self.postMessage([ startNum, r, gamma(r) ]);
}, 500);
});
};
`
Now after browserifying this example, the console will
contain output from the worker:
`
[ 4, 0.09162078520553618, 10.421030346237066 ]
[ 4, 2.026562457360466, 1.011522336481017 ]
[ 4, 3.1853125018703716, 2.3887589540750214 ]
[ 4, 5.6989969260510005, 72.40768854476167 ]
[ 4, 8.679491643020487, 20427.19357947782 ]
[ 4, 0.8528139834191428, 1.1098187157762498 ]
[ 4, 8.068322137547542, 5785.928308309402 ]
...
` js`
var work = require('webworkify')
Return a new
web worker
from the module at modulePath.
The file at modulePath should export its worker code in module.exports as a
function that will be run with no arguments.
Note that all the code outside of the module.exports function will be run inrequire()
the main thread too so don't put any computationally intensive code in that
part. It is necessary for the main code to the worker code to fetchmodulePath
the module reference and load 's dependency graph into the bundle
output.
The worker w returned by webworkify has the property objectURL attached.w.objectURL refers to the Object URL that was used to pass the module's sourceURL.revokeObjectURL()
to the worker, and can be cleaned up using . (See example)
With npm do:
`
npm install webworkify
MIT