babel/packages/babel-core/src/transform-file.js

33 lines
731 B
JavaScript

// @flow
import fs from "fs";
import loadConfig from "./config";
import runTransform, { type FileResult } from "./transformation";
export default function transformFile(
filename: string,
opts?: Object = {},
callback: (?Error, FileResult | null) => void,
) {
if (typeof opts === "function") {
callback = opts;
opts = {};
}
opts.filename = filename;
const config = loadConfig(opts);
if (config === null) return callback(null, null);
fs.readFile(filename, "utf8", function(err, code: string) {
if (err) return callback(err, null);
let result;
try {
result = runTransform(config, code);
} catch (_err) {
return callback(_err, null);
}
callback(null, result);
});
}