99 lines
2.3 KiB
JavaScript
99 lines
2.3 KiB
JavaScript
const path = require('path');
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const babel = require('rollup-plugin-babel');
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const resolve = require('rollup-plugin-node-resolve');
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const common = require('rollup-plugin-commonjs');
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const rollup = require('rollup');
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const terser = require('rollup-plugin-terser').terser;
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const fse = require('fs-extra');
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async function build(input, {minify = true} = {}) {
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const plugins = [
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{
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name: 'remove export let create',
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transform(code, id) {
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if (id !== input) {
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return null;
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}
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return code.replace('export let create;', '');
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}
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},
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common(),
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resolve(),
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babel({
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'externalHelpers': true,
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'presets': [
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[
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'@babel/preset-env',
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{
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'modules': false,
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'targets': 'last 2 version, not dead'
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}
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]
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]
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})
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];
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if (minify) {
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plugins.push(terser());
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}
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plugins.push({
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name: 'serialize worker and export create function',
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renderChunk(code) {
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return `
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const source = ${JSON.stringify(code)};
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const blob = new Blob([source], {type: 'application/javascript'});
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const url = URL.createObjectURL(blob);
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export function create() {
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return new Worker(url);
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}
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`;
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}
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});
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const bundle = await rollup.rollup({input, plugins});
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const {output} = await bundle.generate({format: 'es'});
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if (output.length !== 1) {
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throw new Error(`Unexpected output length: ${output.length}`);
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}
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const chunk = output[0];
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if (chunk.isAsset) {
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throw new Error('Expected a chunk, got an asset');
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}
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return chunk;
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}
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exports.build = build;
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/**
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* Creates modules with inlined versions of the worker sources. These modules
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* export a `create` function for creating a worker.
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*/
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async function main() {
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const inputDir = path.join(__dirname, '../src/ol/worker');
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const outputDir = path.join(__dirname, '../build/ol/src/worker');
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await fse.ensureDir(outputDir);
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const entries = await fse.readdir(inputDir);
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for (const entry of entries) {
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if (!entry.endsWith('.js')) {
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continue;
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}
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const chunk = await build(path.join(inputDir, entry));
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await fse.writeFile(path.join(outputDir, entry), chunk.code);
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}
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}
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if (require.main === module) {
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main().catch(err => {
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process.stderr.write(`${err.stack}\n`);
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process.exit(1);
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});
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}
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