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#!/usr/bin/env node
const path = require('path');
const program = require('commander');
const fs = require('fs');
const fse = require('fs-extra');
const babel = require('@babel/core');
program
.option('-m, --with-source-maps [type]', 'output source maps when not generating a bundled app (type may be empty for external source maps, inline for inline source maps, or both) ')
.option('--clean', 'clear the lib folder before building')
.parse(process.argv);
// the various important paths
const paths = {
main: path.resolve(__dirname, '..'),
core: path.resolve(__dirname, '..', 'core'),
vendor: path.resolve(__dirname, '..', 'vendor'),
libDirBase: path.resolve(__dirname, '..', 'lib'),
};
// util.promisify requires Node.js 8.x, so we have our own
function promisify(original) {
return function promiseWrap() {
const args = Array.prototype.slice.call(arguments);
return new Promise((resolve, reject) => {
original.apply(this, args.concat((err, value) => {
if (err) return reject(err);
resolve(value);
}));
});
};
}
const writeFile = promisify(fs.writeFile);
const readdir = promisify(fs.readdir);
const lstat = promisify(fs.lstat);
const ensureDir = promisify(fse.ensureDir);
const babelTransformFile = promisify(babel.transformFile);
// walkDir *recursively* walks directories trees,
// calling the callback for all normal files found.
function walkDir(basePath, cb, filter) {
return readdir(basePath)
.then((files) => {
const paths = files.map(filename => path.join(basePath, filename));
return Promise.all(paths.map(filepath => lstat(filepath)
.then((stats) => {
if (filter !== undefined && !filter(filepath, stats)) return;
if (stats.isSymbolicLink()) return;
if (stats.isFile()) return cb(filepath);
if (stats.isDirectory()) return walkDir(filepath, cb, filter);
})));
});
}
function makeLibFiles(sourceMaps) {
// NB: we need to make a copy of babelOpts, since babel sets some defaults on it
const babelOpts = () => ({
plugins: [],
presets: [
[ '@babel/preset-env',
{ modules: 'commonjs' } ]
],
ast: false,
sourceMaps: sourceMaps,
});
fse.ensureDirSync(paths.libDirBase);
const outFiles = [];
const handleDir = (vendorRewrite, inPathBase, filename) => Promise.resolve()
.then(() => {
const outPath = path.join(paths.libDirBase, path.relative(inPathBase, filename));
if (path.extname(filename) !== '.js') {
return; // skip non-javascript files
}
return Promise.resolve()
.then(() => ensureDir(path.dirname(outPath)))
.then(() => {
const opts = babelOpts();
// Adjust for the fact that we move the core files relative
// to the vendor directory
if (vendorRewrite) {
opts.plugins.push(["import-redirect",
{"root": paths.libDirBase,
"redirect": { "vendor/(.+)": "./vendor/$1"}}]);
}
return babelTransformFile(filename, opts)
.then((res) => {
console.log(`Writing ${outPath}`);
const {map} = res;
let {code} = res;
if (sourceMaps === true) {
// append URL for external source map
code += `\n//# sourceMappingURL=${path.basename(outPath)}.map\n`;
}
outFiles.push(`${outPath}`);
return writeFile(outPath, code)
.then(() => {
if (sourceMaps === true || sourceMaps === 'both') {
console.log(` and ${outPath}.map`);
outFiles.push(`${outPath}.map`);
return writeFile(`${outPath}.map`, JSON.stringify(map));
}
});
});
});
});
Promise.resolve()
.then(() => {
const handler = handleDir.bind(null, false, paths.main);
return walkDir(paths.vendor, handler);
})
.then(() => {
const handler = handleDir.bind(null, true, paths.core);
return walkDir(paths.core, handler);
})
.catch((err) => {
console.error(`Failure converting modules: ${err}`);
process.exit(1);
});
}
let options = program.opts();
if (options.clean) {
console.log(`Removing ${paths.libDirBase}`);
fse.removeSync(paths.libDirBase);
}
makeLibFiles(options.withSourceMaps);
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