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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
// This module is the entry point for "main" isolate, ie. the one
// that is created when you run "deno" executable.
//
// It provides a single function that should be called by Rust:
// - `bootstrapMainRuntime` - must be called once, when Isolate is created.
// It sets up runtime by providing globals for `WindowScope` and adds `Deno` global.
import * as denoNs from "./deno.ts";
import * as denoUnstableNs from "./deno_unstable.ts";
import { exit } from "./ops/os.ts";
import {
readOnly,
getterOnly,
writable,
windowOrWorkerGlobalScopeMethods,
windowOrWorkerGlobalScopeProperties,
eventTargetProperties,
setEventTargetData,
} from "./globals.ts";
import { unstableMethods, unstableProperties } from "./globals_unstable.ts";
import { internalObject, internalSymbol } from "./internals.ts";
import { setSignals } from "./signals.ts";
import { replLoop } from "./repl.ts";
import { setTimeout } from "./web/timers.ts";
import * as runtime from "./runtime.ts";
import { log, immutableDefine } from "./util.ts";
// TODO: factor out `Deno` global assignment to separate function
// Add internal object to Deno object.
// This is not exposed as part of the Deno types.
// @ts-ignore
denoNs[internalSymbol] = internalObject;
let windowIsClosing = false;
function windowClose(): void {
if (!windowIsClosing) {
windowIsClosing = true;
// Push a macrotask to exit after a promise resolve.
// This is not perfect, but should be fine for first pass.
Promise.resolve().then(() =>
setTimeout.call(
null,
() => {
// This should be fine, since only Window/MainWorker has .close()
exit(0);
},
0
)
);
}
}
export const mainRuntimeGlobalProperties = {
window: readOnly(globalThis),
self: readOnly(globalThis),
// TODO(bartlomieju): from MDN docs (https://developer.mozilla.org/en-US/docs/Web/API/WorkerGlobalScope)
// it seems those two properties should be available to workers as well
onload: writable(null),
onunload: writable(null),
close: writable(windowClose),
closed: getterOnly(() => windowIsClosing),
};
let hasBootstrapped = false;
export function bootstrapMainRuntime(): void {
if (hasBootstrapped) {
throw new Error("Worker runtime already bootstrapped");
}
// Remove bootstrapping methods from global scope
// @ts-ignore
globalThis.bootstrap = undefined;
log("bootstrapMainRuntime");
hasBootstrapped = true;
Object.defineProperties(globalThis, windowOrWorkerGlobalScopeMethods);
Object.defineProperties(globalThis, windowOrWorkerGlobalScopeProperties);
Object.defineProperties(globalThis, eventTargetProperties);
Object.defineProperties(globalThis, mainRuntimeGlobalProperties);
setEventTargetData(globalThis);
// Registers the handler for window.onload function.
globalThis.addEventListener("load", (e) => {
const { onload } = globalThis;
if (typeof onload === "function") {
onload(e);
}
});
// Registers the handler for window.onunload function.
globalThis.addEventListener("unload", (e) => {
const { onunload } = globalThis;
if (typeof onunload === "function") {
onunload(e);
}
});
const { args, cwd, noColor, pid, repl, unstableFlag } = runtime.start();
Object.defineProperties(denoNs, {
pid: readOnly(pid),
noColor: readOnly(noColor),
args: readOnly(Object.freeze(args)),
});
if (unstableFlag) {
Object.defineProperties(globalThis, unstableMethods);
Object.defineProperties(globalThis, unstableProperties);
Object.assign(denoNs, denoUnstableNs);
}
// Setup `Deno` global - we're actually overriding already
// existing global `Deno` with `Deno` namespace from "./deno.ts".
immutableDefine(globalThis, "Deno", denoNs);
Object.freeze(globalThis.Deno);
Object.freeze(globalThis.Deno.core);
Object.freeze(globalThis.Deno.core.sharedQueue);
setSignals();
log("cwd", cwd);
log("args", args);
if (repl) {
replLoop();
}
}
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