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108 lines
3 KiB
TypeScript
108 lines
3 KiB
TypeScript
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
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import { assert } from "../testing/asserts.ts";
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import { exists } from "../fs/exists.ts";
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export interface DefineFactory {
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/* eslint-disable-next-line @typescript-eslint/no-explicit-any */
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(...args: any): object | void;
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}
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export interface ModuleMetaData {
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dependencies: string[];
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factory?: DefineFactory | object;
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exports: object;
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}
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type Define = (
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id: string,
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dependencies: string[],
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factory: DefineFactory
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) => void;
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/* eslint-disable @typescript-eslint/no-namespace */
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declare global {
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namespace globalThis {
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var define: Define | undefined;
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}
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}
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/* eslint-enable @typescript-eslint/no-namespace */
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/** Evaluate the bundle, returning a queue of module IDs and their data to
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* instantiate.
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*/
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export function evaluate(
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text: string
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): [string[], Map<string, ModuleMetaData>] {
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const queue: string[] = [];
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const modules = new Map<string, ModuleMetaData>();
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globalThis.define = function define(
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id: string,
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dependencies: string[],
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factory: DefineFactory
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): void {
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modules.set(id, {
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dependencies,
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factory,
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exports: {}
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});
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queue.push(id);
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};
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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(Deno as any).core.evalContext(text);
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// Deleting `define()` so it isn't accidentally there when the modules
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// instantiate.
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delete globalThis.define;
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return [queue, modules];
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}
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/** Drain the queue of module IDs while instantiating the modules. */
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export function instantiate(
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queue: string[],
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modules: Map<string, ModuleMetaData>
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): void {
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let id: string | undefined;
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while ((id = queue.shift())) {
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const module = modules.get(id)!;
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assert(module != null);
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assert(module.factory != null);
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const dependencies = module.dependencies.map(
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(id): object => {
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if (id === "require") {
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// TODO(kitsonk) support dynamic import by passing a `require()` that
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// can return a local module or dynamically import one.
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return (): void => {};
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} else if (id === "exports") {
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return module.exports;
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}
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const dep = modules.get(id)!;
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assert(dep != null);
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return dep.exports;
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}
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);
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if (typeof module.factory === "function") {
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module.factory!(...dependencies);
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} else if (module.factory) {
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// when bundling JSON, TypeScript just emits it as an object/array as the
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// third argument of the `define()`.
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module.exports = module.factory;
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}
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delete module.factory;
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}
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}
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/** Load the bundle and return the contents asynchronously. */
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export async function load(args: string[]): Promise<string> {
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// TODO(kitsonk) allow loading of remote bundles via fetch.
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assert(args.length >= 2, "Expected at least two arguments.");
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const [, bundleFileName] = args;
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assert(
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await exists(bundleFileName),
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`Expected "${bundleFileName}" to exist.`
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);
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return new TextDecoder().decode(await Deno.readFile(bundleFileName));
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}
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