88 lines
1.8 KiB
JavaScript
88 lines
1.8 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 {
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runSync,
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runAsync,
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type FileResult,
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type FileResultCallback,
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} 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 const transformFile: TransformFile = (function transformFile(
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filename,
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opts,
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callback,
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) {
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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 = {
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...opts,
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filename,
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};
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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);
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export function transformFileSync(
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filename: string,
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opts: ?InputOptions,
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): FileResult | null {
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let options;
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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 = {
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...opts,
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filename,
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};
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}
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const config = loadConfig(options);
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if (config === null) return null;
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return runSync(config, fs.readFileSync(filename, "utf8"));
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}
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export function transformFileAsync(
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filename: string,
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opts: ?InputOptions,
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): Promise<FileResult | null> {
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return new Promise((res, rej) => {
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transformFile(filename, opts, (err, result) => {
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if (err == null) res(result);
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else rej(err);
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});
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});
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}
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