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