threads
Version:
Web workers & worker threads as simple as a function call
74 lines (73 loc) • 3.33 kB
JavaScript
;
// tslint:disable max-classes-per-file
Object.defineProperty(exports, "__esModule", { value: true });
exports.isWorkerRuntime = exports.getWorkerImplementation = exports.defaultPoolSize = void 0;
const get_bundle_url_browser_1 = require("./get-bundle-url.browser");
exports.defaultPoolSize = typeof navigator !== "undefined" && navigator.hardwareConcurrency
? navigator.hardwareConcurrency
: 4;
const isAbsoluteURL = (value) => /^[a-zA-Z][a-zA-Z\d+\-.]*:/.test(value);
function createSourceBlobURL(code) {
const blob = new Blob([code], { type: "application/javascript" });
return URL.createObjectURL(blob);
}
function selectWorkerImplementation() {
if (typeof Worker === "undefined") {
// Might happen on Safari, for instance
// The idea is to only fail if the constructor is actually used
return class NoWebWorker {
constructor() {
throw Error("No web worker implementation available. You might have tried to spawn a worker within a worker in a browser that doesn't support workers in workers.");
}
};
}
class WebWorker extends Worker {
constructor(url, options) {
var _a, _b;
if (typeof url === "string" && options && options._baseURL) {
url = new URL(url, options._baseURL);
}
else if (typeof url === "string" && !isAbsoluteURL(url) && get_bundle_url_browser_1.getBundleURL().match(/^file:\/\//i)) {
url = new URL(url, get_bundle_url_browser_1.getBundleURL().replace(/\/[^\/]+$/, "/"));
if ((_a = options === null || options === void 0 ? void 0 : options.CORSWorkaround) !== null && _a !== void 0 ? _a : true) {
url = createSourceBlobURL(`importScripts(${JSON.stringify(url)});`);
}
}
if (typeof url === "string" && isAbsoluteURL(url)) {
// Create source code blob loading JS file via `importScripts()`
// to circumvent worker CORS restrictions
if ((_b = options === null || options === void 0 ? void 0 : options.CORSWorkaround) !== null && _b !== void 0 ? _b : true) {
url = createSourceBlobURL(`importScripts(${JSON.stringify(url)});`);
}
}
super(url, options);
}
}
class BlobWorker extends WebWorker {
constructor(blob, options) {
const url = window.URL.createObjectURL(blob);
super(url, options);
}
static fromText(source, options) {
const blob = new window.Blob([source], { type: "text/javascript" });
return new BlobWorker(blob, options);
}
}
return {
blob: BlobWorker,
default: WebWorker
};
}
let implementation;
function getWorkerImplementation() {
if (!implementation) {
implementation = selectWorkerImplementation();
}
return implementation;
}
exports.getWorkerImplementation = getWorkerImplementation;
function isWorkerRuntime() {
const isWindowContext = typeof self !== "undefined" && typeof Window !== "undefined" && self instanceof Window;
return typeof self !== "undefined" && self.postMessage && !isWindowContext ? true : false;
}
exports.isWorkerRuntime = isWorkerRuntime;