chore: add prettier

.travis.yml

@@ -5,6 +5,7 @@ node_js:
 
 script:
 - yarn run lint
+- yarn run format-check
 - yarn run test -- --verbose --coverage
 
 after_success:

gulpfile.ts

@@ -0,0 +1,21 @@
+import * as gulp from 'gulp';
+import * as prettier from 'gulp-plugin-prettier';
+import * as prettier_options from 'tslint-config-ikatyang/prettier';
+
+// tslint:disable-next-line:no-var-requires
+const sources = require('./tsconfig.json').include;
+
+gulp.task('format', () =>
+  gulp
+    .src(sources)
+    .pipe(prettier.format(prettier_options, { filter: true }))
+    .pipe(gulp.dest(file => file.base)),
+);
+
+gulp.task('format-check', () =>
+  gulp
+    .src(sources)
+    .pipe(
+      prettier.format(prettier_options, { reporter: prettier.Reporter.Error }),
+    ),
+);

package.json

@@ -9,7 +9,9 @@
   "scripts": {
     "lint": "tslint -p ./tsconfig.json",
     "test": "jest -c ./jest.json",
-    "generate": "ts-node ./scripts/generate.ts ./README.md"
+    "generate": "ts-node ./scripts/generate.ts ./README.md",
+    "format": "gulp format",
+    "format-check": "gulp format-check"
   },
   "dependencies": {
     "cheerio": "^0.22.0",
@@ -17,11 +19,16 @@
   },
   "devDependencies": {
     "@types/cheerio": "0.22.2",
+    "@types/gulp": "3.8.33",
     "@types/jest": "20.0.4",
     "@types/node": "8.0.14",
+    "@types/prettier": "1.5.0",
     "@types/request": "2.0.0",
+    "gulp": "3.9.1",
+    "gulp-plugin-prettier": "1.0.0",
     "jest": "20.0.4",
     "jest-playback": "1.0.0",
+    "prettier": "1.5.3",
     "ts-jest": "20.0.7",
     "ts-node": "3.2.1",
     "tslint": "5.5.0",