babel/babel-worker.cjs
Huáng Jùnliàng 69f423b873
Faster babel build (#13423)
* chore: add glob and jest-worker

* add buildBabel2 routine

* cleanup

* exit gracefully when CI does not have available workers

* perf: less IO when dest is not entity

* perf: pipe worker stdout/stderr to parent process

* Update Gulpfile.mjs

Co-authored-by: Brian Ng <bng412@gmail.com>

Co-authored-by: Brian Ng <bng412@gmail.com>
2021-06-11 14:50:51 -04:00

40 lines
1.0 KiB
JavaScript

const { transformSync } = require("@babel/core");
const { mkdirSync, statSync, readFileSync, writeFileSync } = require("fs");
const { dirname } = require("path");
const chalk = require("chalk");
const fancyLog = require("fancy-log");
function needCompile(src, dest) {
let destStat;
try {
destStat = statSync(dest);
} catch (err) {
if (err.code === "ENOENT") {
return true;
} else {
throw err;
}
}
const srcStat = statSync(src);
return srcStat.mtimeMs > destStat.mtimeMs;
}
exports.transform = function (src, dest) {
mkdirSync(dirname(dest), { recursive: true });
if (!needCompile(src, dest)) {
return;
}
fancyLog(`Compiling '${chalk.cyan(src)}'...`);
const content = readFileSync(src, { encoding: "utf8" });
const { code } = transformSync(content, {
filename: src,
caller: {
// We have wrapped packages/babel-core/src/config/files/configuration.js with feature detection
supportsDynamicImport: true,
name: "babel-worker",
},
});
writeFileSync(dest, code, "utf8");
};