fix(local): improve local setup

.gitignore

@@ -1 +1,2 @@
-node_modules
+node_modules
+.yarn

.prettierignore

@@ -0,0 +1 @@
+node_modules/**

.prettierrc.yml

@@ -0,0 +1,5 @@
+# All of these are defaults except singleQuote and endOfLine, but we specify them
+# for explicitness
+endOfLine: auto
+singleQuote: true
+trailingComma: all

.yarnrc.yml

@@ -0,0 +1 @@
+nodeLinker: node-modules

package.json

@@ -2,17 +2,20 @@
   "name": "my-test-repo",
   "version": "1.0.0",
   "scripts": {
+    "format": "prettier --write \"**/*.ts\"",
     "add-release-label-to-pr-and-linked-issues": "ts-node ./.github/scripts/add-release-label-to-pr-and-linked-issues.ts",
     "check-pr-has-required-labels": "ts-node ./.github/scripts/check-pr-has-required-labels.ts",
     "close-release-bug-report-issue": "ts-node ./.github/scripts/close-release-bug-report-issue.ts",
     "check-template-and-add-labels": "ts-node ./.github/scripts/check-template-and-add-labels.ts"
   },
   "devDependencies": {
-    "typescript": "~4.4.0",
-    "ts-node": "^10.5.0",
-    "@types/node": "^17.0.21",
-    "@tsconfig/node16": "^1.0.3",
     "@actions/core": "^1.10.0",
-    "@actions/github": "^5.1.1"
+    "@actions/github": "^5.1.1",
+    "@tsconfig/node16": "^1.0.3",
+    "@types/node": "^17.0.21",
+    "prettier": "^2.7.1",
+    "prettier-plugin-sort-json": "^1.0.0",
+    "ts-node": "^10.5.0",
+    "typescript": "~4.4.0"
   }
 }