cf62908bbd
* Preserve user options in transformFile * Improve tests for transformFile user opts handling
44 lines
1.1 KiB
JavaScript
44 lines
1.1 KiB
JavaScript
// @flow
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import fs from "fs";
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import loadConfig, { type InputOptions } from "./config";
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import { runAsync, type FileResultCallback } from "./transformation";
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type TransformFile = {
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(filename: string, callback: FileResultCallback): void,
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(filename: string, opts: ?InputOptions, callback: FileResultCallback): void,
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};
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export default ((function transformFile(filename, opts, callback) {
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let options;
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if (typeof opts === "function") {
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callback = opts;
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opts = undefined;
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}
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if (opts == null) {
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options = { filename };
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} else if (opts && typeof opts === "object") {
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options = Object.assign({}, opts, { filename });
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}
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process.nextTick(() => {
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let cfg;
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try {
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cfg = loadConfig(options);
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if (cfg === null) return callback(null, null);
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} catch (err) {
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return callback(err);
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}
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// Reassignment to keep Flow happy.
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const config = cfg;
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fs.readFile(filename, "utf8", function(err, code: string) {
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if (err) return callback(err, null);
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runAsync(config, code, null, callback);
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});
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});
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}: Function): TransformFile);
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