forked from external-repos/squoosh
134 lines
3.8 KiB
JavaScript
134 lines
3.8 KiB
JavaScript
/**
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* Copyright 2020 Google Inc. All Rights Reserved.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { spawn } from 'child_process';
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import { relative, join } from 'path';
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import { promises as fsp } from 'fs';
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import { promisify } from 'util';
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import * as ts from 'typescript';
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import glob from 'glob';
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import { sync as whichSync } from 'which';
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const globP = promisify(glob);
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const tscPath = whichSync('tsc');
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const extRe = /\.tsx?$/;
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function loadConfig(mainPath) {
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const fileName = ts.findConfigFile(mainPath, ts.sys.fileExists);
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if (!fileName) throw Error('tsconfig not found');
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const text = ts.sys.readFile(fileName);
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const loadedConfig = ts.parseConfigFileTextToJson(fileName, text).config;
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const parsedTsConfig = ts.parseJsonConfigFileContent(
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loadedConfig,
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ts.sys,
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process.cwd(),
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undefined,
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fileName,
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);
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return parsedTsConfig;
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}
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export default function simpleTS(mainPath, { noBuild, watch } = {}) {
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const config = loadConfig(mainPath);
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const args = ['-b', mainPath];
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let tsBuildDone;
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async function watchBuiltFiles(rollupContext) {
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const matches = await globP(config.options.outDir + '/**/*.js');
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for (const match of matches) rollupContext.addWatchFile(match);
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}
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async function tsBuild(rollupContext) {
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if (tsBuildDone) {
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// Watch lists are cleared on each build, so we need to rewatch all the JS files.
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await watchBuiltFiles(rollupContext);
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return tsBuildDone;
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}
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if (noBuild) {
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return (tsBuildDone = Promise.resolve());
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}
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tsBuildDone = Promise.resolve().then(async () => {
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await new Promise((resolve) => {
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const proc = spawn(tscPath, args, {
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stdio: 'inherit',
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});
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proc.on('exit', (code) => {
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if (code !== 0) {
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throw Error('TypeScript build failed');
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}
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resolve();
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});
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});
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await watchBuiltFiles(rollupContext);
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if (watch) {
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tsBuildDone.then(() => {
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spawn(tscPath, [...args, '--watch', '--preserveWatchOutput'], {
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stdio: 'inherit',
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});
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});
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}
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});
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return tsBuildDone;
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}
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return {
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name: 'simple-ts',
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resolveId(id, importer) {
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// If there isn't an importer, it's an entry point, so we don't need to resolve it relative
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// to something.
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if (!importer) return null;
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const tsResolve = ts.resolveModuleName(
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id,
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importer,
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config.options,
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ts.sys,
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);
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if (
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// It didn't find anything
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!tsResolve.resolvedModule ||
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// Or if it's linking to a definition file, it's something in node_modules,
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// or something local like css.d.ts
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tsResolve.resolvedModule.extension === '.d.ts'
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) {
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return null;
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}
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return tsResolve.resolvedModule.resolvedFileName;
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},
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async load(id) {
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if (!extRe.test(id)) return null;
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// TypeScript building is deferred until the first TS file load.
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// This allows prerequisites to happen first,
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// such as css.d.ts generation in css-plugin.
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await tsBuild(this);
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// Look for the JS equivalent in the tmp folder
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const newId = join(
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config.options.outDir,
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relative(config.options.rootDir, id),
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).replace(extRe, '.js');
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return fsp.readFile(newId, { encoding: 'utf8' });
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},
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};
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}
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