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;