69 lines
2.4 KiB
JavaScript
69 lines
2.4 KiB
JavaScript
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#!/usr/bin/env node
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// Transpiles all .js files under a directory (in place) to syntax supported
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// by nodejs-mobile-cordova's embedded Node 12.19 — primarily optional
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// chaining (?.) and nullish coalescing (??) used by some npm dependencies
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// and by this project's own source.
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//
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// Usage: node transpile-node12.js <dir> [<dir> ...]
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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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// Resolve esbuild from this project's own node_modules (no longer parent repo)
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const esbuild = require('esbuild');
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const SKIP_DIRS = new Set(['.bin']);
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function walk(dir, cb) {
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for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
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if (SKIP_DIRS.has(entry.name)) continue;
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const full = path.join(dir, entry.name);
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if (entry.isSymbolicLink()) continue;
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if (entry.isDirectory()) {
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walk(full, cb);
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} else if (entry.name.endsWith('.js') || entry.name.endsWith('.cjs') || entry.name === 'package.json') {
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cb(full);
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}
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}
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}
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let count = 0;
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let pkgCount = 0;
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for (const dir of process.argv.slice(2)) {
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if (!fs.existsSync(dir)) continue;
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walk(dir, (file) => {
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if (path.basename(file) === 'package.json') {
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// esbuild converts ESM (import/export) to CJS (module.exports) below,
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// but Node still treats .js files as ES modules if the nearest
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// package.json has "type": "module" — drop that so the converted
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// CJS output is loaded correctly under Node 12.
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const pkg = JSON.parse(fs.readFileSync(file, 'utf8'));
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if (pkg.type === 'module') {
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delete pkg.type;
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fs.writeFileSync(file, JSON.stringify(pkg, null, 2) + '\n');
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pkgCount++;
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}
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return;
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}
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const src = fs.readFileSync(file, 'utf8');
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let out;
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try {
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out = esbuild.transformSync(src, { target: 'node12', format: 'cjs', loader: 'js' }).code;
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} catch (err) {
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console.warn(`Skipping ${file}: ${err.message.split('\n')[0]}`);
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return;
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}
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// Node 12 doesn't understand the "node:" builtin-module prefix
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// (added in Node 14.18/16), used by some dependencies (e.g. express-rate-limit).
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out = out.replace(/require\((['"])node:([a-z/_-]+)\1\)/g, "require($1$2$1)");
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if (out !== src) {
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fs.writeFileSync(file, out);
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count++;
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}
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});
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}
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console.log(`Transpiled ${count} file(s) and dropped "type": "module" from ${pkgCount} package.json file(s) for Node 12 compatibility.`);
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