use prettier at migrate

Author: evenstensberg

lib/commands/migrate.js

@@ -7,6 +7,8 @@ const inquirer = require("inquirer");
 const PLazy = require("p-lazy");
 const Listr = require("listr");
 
+const runPrettier = require("../utils/run-prettier");
+
 module.exports = function transformFile(
 	currentConfigPath,
 	outputConfigPath,
@@ -78,7 +80,7 @@ module.exports = function transformFile(
 				])
 				.then(answers => {
 					if (answers["confirmMigration"]) {
-						fs.writeFile(outputConfigPath, result, "utf8", err => {
+						runPrettier(outputConfigPath, result, err => {
 							if (err) {
 								throw err;
 							} else {

lib/utils/run-prettier.js

@@ -13,9 +13,10 @@ const chalk = require("chalk");
 * @returns fs - Writes a file at given location and prints messages accordingly
 */
 
-module.exports = function runPrettier(outputPath, source) {
+module.exports = function runPrettier(outputPath, source, cb) {
 	function validateConfig() {
 		let prettySource;
+		let error;
 		try {
 			prettySource = prettier.format(source, {
 				singleQuote: true,
@@ -31,6 +32,10 @@ module.exports = function runPrettier(outputPath, source) {
 					)
 			);
 			prettySource = source;
+			error = err;
+		}
+		if (cb) {
+			return cb(error);
 		}
 		return fs.writeFileSync(outputPath, prettySource, "utf8");
 	}