feat!: switch to prettier for formatting (#259)

* feat!: switch to prettier for formatting

BREAKING CHANGE: Switch to prettier as the code formatter.

Fixes: #156

README.md

@@ -14,7 +14,7 @@
 - **Catch style issues & programmer errors early**. Save precious code review time by eliminating back-and-forth between reviewer & contributor.
 - **Opinionated, but not to a fault**. We recommend you use the default configuration, but if you *need* to customize compiler or linter config, you can.
 
-Under the covers, we use [tslint][tslint-url] to enforce the style guide and provide automated fixes, and [clang-format][clang-format-url] to re-format code.
+Under the covers, we use [tslint][tslint-url] to enforce the style guide and provide automated fixes, and [prettier][prettier-url] to re-format code.
 
 Made with ❤️ by the Google Node.js team.
 
@@ -59,7 +59,7 @@ See [LICENSE](LICENSE)
 
 [circle-image]: https://circleci.com/gh/google/ts-style.svg?style=svg
 [circle-url]: https://circleci.com/gh/google/ts-style
-[clang-format-url]: https://github.com/angular/clang-format
+[prettier-url]: https://prettier.io/
 [codecov-image]: https://codecov.io/gh/google/ts-style/branch/master/graph/badge.svg
 [codecov-url]: https://codecov.io/gh/google/ts-style
 [david-dev-image]: https://david-dm.org/google/ts-style/dev-status.svg

package.json

@@ -8,12 +8,12 @@
     "gts": "build/src/cli.js"
   },
   "files": [
-    ".clang-format",
     "CHANGELOG.md",
     "LICENSE",
     "README.md",
     "build/src",
     "build/types",
+    "prettier.config.js",
     "tsconfig-google.json",
     "tsconfig.json",
     "tslint.json"
@@ -41,7 +41,6 @@
   "license": "Apache-2.0",
   "dependencies": {
     "chalk": "^2.4.1",
-    "clang-format": "1.2.3",
     "diff": "^4.0.1",
     "entities": "^1.1.1",
     "inquirer": "^6.0.0",
@@ -63,6 +62,7 @@
     "@types/ncp": "^2.0.1",
     "@types/node": "^10.0.3",
     "@types/pify": "^3.0.2",
+    "@types/prettier": "^1.15.2",
     "@types/rimraf": "^2.0.2",
     "@types/tmp": "^0.0.33",
     "@types/update-notifier": "^2.2.0",

prettier.config.js

@@ -0,0 +1,4 @@
+module.exports = {
+  singleQuote: true,
+  trailingComma: 'es5',
+};

src/clean.ts

@@ -16,8 +16,8 @@
 import chalk from 'chalk';
 import * as ts from 'typescript';
 
-import {Options} from './cli';
-import {getTSConfig, rimrafp} from './util';
+import { Options } from './cli';
+import { getTSConfig, rimrafp } from './util';
 
 interface TSConfig {
   compilerOptions: ts.CompilerOptions;

src/cli.ts

@@ -17,8 +17,8 @@
 import * as path from 'path';
 import * as meow from 'meow';
 import * as updateNotifier from 'update-notifier';
-import {init} from './init';
-import {clean} from './clean';
+import { init } from './init';
+import { clean } from './clean';
 
 const packageJson = require('../../package.json');
 
@@ -69,10 +69,10 @@ const cli = meow({
     $ gts fix src/file1.ts src/file2.ts
     $ gts clean`,
   flags: {
-    help: {type: 'boolean'},
-    yes: {type: 'boolean', alias: 'y'},
-    no: {type: 'boolean', alias: 'n'},
-    'dry-run': {type: 'boolean'},
+    help: { type: 'boolean' },
+    yes: { type: 'boolean', alias: 'y' },
+    no: { type: 'boolean', alias: 'n' },
+    'dry-run': { type: 'boolean' },
   },
 });
 
@@ -120,7 +120,7 @@ async function run(verb: string, files: string[]): Promise<boolean> {
   }
 }
 
-updateNotifier({pkg: packageJson}).notify();
+updateNotifier({ pkg: packageJson }).notify();
 
 if (cli.input.length < 1) {
   usage();