sucrase
Version:
Super-fast alternative to Babel for when you can target modern JS runtimes
61 lines (60 loc) • 2.54 kB
JavaScript
/* eslint-disable no-console */
import * as commander from "commander";
import { exists, mkdir, readdir, readFile, stat, writeFile } from "mz/fs";
import { join } from "path";
import { transform } from "./index";
export default function run() {
commander
.description(`Sucrase: super-fast Babel alternative.`)
.usage("[options] <srcDir>")
.option("-d, --out-dir <out>", "Compile an input directory of modules into an output directory.")
.option("--exclude-dirs <paths>", "Names of directories that should not be traversed.")
.option("-t, --transforms <transforms>", "Comma-separated list of transforms to run.")
.parse(process.argv);
if (!commander.outDir) {
console.error("Out directory is required");
process.exit(1);
}
if (!commander.transforms) {
console.error("Transforms option is required.");
process.exit(1);
}
if (!commander.args[0]) {
console.error("Source directory is required.");
process.exit(1);
}
const outDir = commander.outDir;
const transforms = commander.transforms.split(",");
const srcDir = commander.args[0];
const excludeDirs = commander.excludeDirs ? commander.excludeDirs.split(",") : [];
buildDirectory(srcDir, outDir, excludeDirs, transforms).catch((e) => {
process.exitCode = 1;
console.error(e);
});
}
async function buildDirectory(srcDirPath, outDirPath, excludeDirs, transforms) {
const extension = transforms.includes("typescript") ? ".ts" : ".js";
if (!await exists(outDirPath)) {
await mkdir(outDirPath);
}
for (const child of await readdir(srcDirPath)) {
if (["node_modules", ".git"].includes(child) || excludeDirs.includes(child)) {
continue;
}
const srcChildPath = join(srcDirPath, child);
const outChildPath = join(outDirPath, child);
if ((await stat(srcChildPath)).isDirectory()) {
await buildDirectory(srcChildPath, outChildPath, excludeDirs, transforms);
}
else if (srcChildPath.endsWith(extension)) {
const outPath = `${outChildPath.substr(0, outChildPath.length - 3)}.js`;
await buildFile(srcChildPath, outPath, transforms);
}
}
}
async function buildFile(srcPath, outPath, transforms) {
console.log(`${srcPath} -> ${outPath}`);
const code = (await readFile(srcPath)).toString();
const transformedCode = transform(code, { transforms });
await writeFile(outPath, transformedCode);
}