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denoland-deno/cli/js/runtime_main.ts
Kitson Kelly fc4819e1e0
refactor: Event and EventTarget implementations (#4707)
Refactors Event and EventTarget so that they better encapsulate their
non-public data as well as are more forward compatible with things like
DOM Nodes.

Moves `dom_types.ts` -> `dom_types.d.ts` which was always the intention,
it was a legacy of when we used to build the types from the code and the
limitations of the compiler.  There was a lot of cruft in `dom_types`
which shouldn't have been there, and mis-alignment to the DOM standards.
This generally has been eliminated, though we still have some minor
differences from the DOM (like the removal of some deprecated
methods/properties).

Adds `DOMException`.  Strictly it shouldn't inherit from `Error`, but
most browsers provide a stack trace when one is thrown, so the behaviour
in Deno actually better matches the browser.

`Event` still doesn't log to console like it does in the browser.  I
 wanted to get this raised and that could be an enhancement later on (it
 currently doesn't either).
2020-04-11 11:42:02 -04:00

122 lines
3.8 KiB
TypeScript

// 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 Deno from "./deno.ts";
import * as csprng from "./ops/get_random_values.ts";
import { exit } from "./ops/os.ts";
import {
readOnly,
getterOnly,
writable,
windowOrWorkerGlobalScopeMethods,
windowOrWorkerGlobalScopeProperties,
eventTargetProperties,
setEventTargetData,
} from "./globals.ts";
import { internalObject } from "./internals.ts";
import { setSignals } from "./signals.ts";
import { replLoop } from "./repl.ts";
import { LocationImpl } from "./web/location.ts";
import { setTimeout } from "./web/timers.ts";
import * as runtime from "./runtime.ts";
import { symbols } from "./symbols.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
Deno[symbols.internal] = 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),
crypto: readOnly(csprng),
// 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");
}
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 s = runtime.start();
const location = new LocationImpl(s.location);
immutableDefine(globalThis, "location", location);
Object.freeze(globalThis.location);
Object.defineProperties(Deno, {
pid: readOnly(s.pid),
noColor: readOnly(s.noColor),
args: readOnly(Object.freeze(s.args)),
});
// Setup `Deno` global - we're actually overriding already
// existing global `Deno` with `Deno` namespace from "./deno.ts".
immutableDefine(globalThis, "Deno", Deno);
Object.freeze(globalThis.Deno);
Object.freeze(globalThis.Deno.core);
Object.freeze(globalThis.Deno.core.sharedQueue);
setSignals();
log("cwd", s.cwd);
log("args", Deno.args);
if (s.repl) {
replLoop();
}
}