chore: add prettier scripts for CI

Author: felixfbecker

package.json

@@ -91,6 +91,8 @@
   },
   "scripts": {
     "eslint": "eslint './src/**/*.ts'",
+    "prettier": "prettier '**/{*.{js?(on),ts?(x),md,yml},.*.js?(on),.*.yml}' --write --list-different",
+    "prettier-check": "yarn run prettier --write=false",
     "typecheck": "tsc -p tsconfig.json",
     "test": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\"}' mocha --require ts-node/register --require source-map-support/register --opts mocha.opts",
     "cover": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\"}' nyc --require ts-node/register --require source-map-support/register --all mocha --opts mocha.opts --timeout 10000",
@@ -111,7 +113,7 @@
     "@commitlint/cli": "^7.0.0",
     "@commitlint/config-conventional": "^7.0.1",
     "@sourcegraph/eslint-config": "^0.12.0",
-    "@sourcegraph/prettierrc": "^2.2.0",
+    "@sourcegraph/prettierrc": "^3.0.3",
     "@sourcegraph/tsconfig": "^3.0.0",
     "@types/mocha": "^5.2.6",
     "@types/node": "^12.7.3",

prettier.config.js

@@ -1 +1 @@
-module.exports = require('@sourcegraph/prettierrc')
+module.exports = require('@sourcegraph/prettierrc')

yarn.lock

@@ -961,11 +961,6 @@
     eslint-plugin-react-hooks "^3.0.0"
     eslint-plugin-rxjs "^0.0.2-beta.16"
 
-"@sourcegraph/prettierrc@^2.2.0":
-  version "2.2.0"
-  resolved "https://registry.yarnpkg.com/@sourcegraph/prettierrc/-/prettierrc-2.2.0.tgz#af4a6fcd465b0a39a07ffbd8f2d3414d01e603e8"
-  integrity sha512-kRdHxdAppxYnN7qAQjNTyuG05pjYHFtEUquZauXVXBeaGB4sye3uSkb8wgi34jeaUHG/gWp2f5hQgCCBMizjjA==
-
 "@sourcegraph/prettierrc@^3.0.3":
   version "3.0.3"
   resolved "https://registry.npmjs.org/@sourcegraph/prettierrc/-/prettierrc-3.0.3.tgz#51bfa9b2588fe35121593fa877143e6373028289"