transform-file.js
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transform-file.js
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			// @flow

			import gensync from "gensync";

			import loadConfig, { type InputOptions, type ResolvedConfig } from "./config";
			import {
			run,
			type FileResult,
			type FileResultCallback,
			} from "./transformation";
			import * as fs from "./gensync-utils/fs";

			import typeof * as transformFileBrowserType from "./transform-file-browser";
			import typeof * as transformFileType from "./transform-file";

			// Kind of gross, but essentially asserting that the exports of this module are the same as the
			// exports of transform-file-browser, since this file may be replaced at bundle time with
			// transform-file-browser.
			((({}: any): $Exact<transformFileBrowserType>): $Exact<transformFileType>);

			type TransformFile = {
			(filename: string, callback: FileResultCallback): void,
			(filename: string, opts: ?InputOptions, callback: FileResultCallback): void,
			};

			const transformFileRunner = gensync<[string, ?InputOptions], FileResult \| null>(
			function* (filename, opts) {
			const options = { ...opts, filename };

			const config: ResolvedConfig \| null = yield* loadConfig(options);
			if (config === null) return null;

			const code = yield* fs.readFile(filename, "utf8");
			return yield* run(config, code);
			},
			);

			export const transformFile: TransformFile = transformFileRunner.errback;
			export const transformFileSync = transformFileRunner.sync;
			export const transformFileAsync = transformFileRunner.async;