68 lines
1.8 KiB
JavaScript
68 lines
1.8 KiB
JavaScript
/**
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* @file
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*
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* Watch changes to *.es6.js files and compile them to ES5 during development.
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*
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* @internal This file is part of the core javascript build process and is only
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* meant to be used in that context.
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*/
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'use strict';
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const fs = require('fs');
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const path = require('path');
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const babel = require('babel-core');
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const chokidar = require('chokidar');
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// Logging human-readable timestamp.
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const log = function log(message) {
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// eslint-disable-next-line no-console
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console.log(`[${new Date().toTimeString().slice(0, 8)}] ${message}`);
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};
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function addSourceMappingUrl(code, loc) {
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return `${code}\n\n//# sourceMappingURL=${path.basename(loc)}`;
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}
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const fileMatch = './**/*.es6.js';
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const watcher = chokidar.watch(fileMatch, {
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ignoreInitial: true,
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ignored: 'node_modules/**'
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});
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const changedOrAdded = (filePath) => {
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babel.transformFile(filePath, {
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sourceMaps: true,
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comments: false
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}, (err, result) => {
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const fileName = filePath.slice(0, -7);
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// we've requested for a sourcemap to be written to disk
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const mapLoc = `${fileName}.js.map`;
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fs.writeFileSync(mapLoc, JSON.stringify(result.map));
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fs.writeFileSync(`${fileName}.js`, addSourceMappingUrl(result.code, mapLoc));
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log(`'${filePath}' has been changed.`);
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});
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};
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const unlinkHandler = (err) => {
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if (err) {
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log(err);
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}
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};
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watcher
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.on('add', filePath => changedOrAdded(filePath))
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.on('change', filePath => changedOrAdded(filePath))
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.on('unlink', (filePath) => {
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const fileName = filePath.slice(0, -7);
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fs.stat(`${fileName}.js`, () => {
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fs.unlink(`${fileName}.js`, unlinkHandler);
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});
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fs.stat(`${fileName}.js.map`, () => {
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fs.unlink(`${fileName}.js.map`, unlinkHandler);
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});
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})
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.on('ready', () => log(`Watching '${fileMatch}' for changes.`));
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