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denoland-deno/cli/js/compiler_bootstrap.ts
Kitson Kelly 046bbb2691
Support loading additional TS lib files (#3863)
Fixes #3726

This PR provides support for referencing other lib files (like lib.dom.d.ts that are not
used by default in Deno.
2020-02-19 00:34:11 -05:00

52 lines
2 KiB
TypeScript

// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { CompilerHostTarget, Host } from "./compiler_host.ts";
import { ASSETS } from "./compiler_sourcefile.ts";
import { getAsset } from "./compiler_util.ts";
// NOTE: target doesn't really matter here,
// this is in fact a mock host created just to
// load all type definitions and snapshot them.
const host = new Host({
target: CompilerHostTarget.Main,
writeFile(): void {}
});
const options = host.getCompilationSettings();
// This is a hacky way of adding our libs to the libs available in TypeScript()
// as these are internal APIs of TypeScript which maintain valid libs
ts.libs.push("deno.ns", "deno.window", "deno.worker", "deno.shared_globals");
ts.libMap.set("deno.ns", "lib.deno.ns.d.ts");
ts.libMap.set("deno.window", "lib.deno.window.d.ts");
ts.libMap.set("deno.worker", "lib.deno.worker.d.ts");
ts.libMap.set("deno.shared_globals", "lib.deno.shared_globals.d.ts");
// this pre-populates the cache at snapshot time of our library files, so they
// are available in the future when needed.
host.getSourceFile(`${ASSETS}/lib.deno.ns.d.ts`, ts.ScriptTarget.ESNext);
host.getSourceFile(`${ASSETS}/lib.deno.window.d.ts`, ts.ScriptTarget.ESNext);
host.getSourceFile(`${ASSETS}/lib.deno.worker.d.ts`, ts.ScriptTarget.ESNext);
host.getSourceFile(
`${ASSETS}/lib.deno.shared_globals.d.ts`,
ts.ScriptTarget.ESNext
);
/**
* This function spins up TS compiler and loads all available libraries
* into memory (including ones specified above).
*
* Used to generate the foundational AST for all other compilations, so it can
* be cached as part of the snapshot and available to speed up startup.
*/
export const TS_SNAPSHOT_PROGRAM = ts.createProgram({
rootNames: [`${ASSETS}/bootstrap.ts`],
options,
host
});
/** A module loader which is concatenated into bundle files.
*
* We read all static assets during the snapshotting process, which is
* why this is located in compiler_bootstrap.
*/
export const SYSTEM_LOADER = getAsset("system_loader.js");