Set up depcheck (#1111)

Author: ecraig12345

.depcheckrc.yml

@@ -0,0 +1,14 @@
+ignore-path: .gitignore
+
+ignores:
+  # used in a jsdoc type
+  - '@typescript-eslint/utils'
+  # used in __fixtures__/registry.ts by partial name
+  - verdaccio-auth-memory
+  - verdaccio-memory
+  # ok with using implicit dev dep for now (part of verdaccio)
+  - '@verdaccio/config'
+
+ignore-patterns:
+  # managed separately
+  - docs

.eslintignore

@@ -0,0 +1,3 @@
+scripts
+docs
+/*.config.js

beachball.config.js

@@ -4,6 +4,7 @@ module.exports = {
   disallowedChangeTypes: ['major'],
   ignorePatterns: [
     '.*ignore',
+    '*.yml',
     '.github/**',
     '.prettierrc.json5',
     '.vscode/**',

change/beachball-c13e9594-7645-495e-9a78-e022e984b3ee.json

@@ -0,0 +1,7 @@
+{
+  "type": "none",
+  "comment": "Set up depcheck",
+  "packageName": "beachball",
+  "email": "elcraig@microsoft.com",
+  "dependentChangeType": "none"
+}

package.json

@@ -30,7 +30,9 @@
     "docs:build": "echo \"Run this from the docs folder instead\" && exit 1",
     "format": "prettier --write '**/*'",
     "prepare": "husky install",
-    "lint": "eslint --color --max-warnings=0 src",
+    "lint": "yarn lint:deps && yarn lint:code",
+    "lint:code": "eslint --color --max-warnings=0 src",
+    "lint:deps": "depcheck .",
     "pub": "node ./lib/cli.js publish",
     "release": "node ./lib/cli.js publish -y",
     "release:docs": "echo \"Run this from the docs folder instead\" && exit 1",
@@ -72,6 +74,7 @@
     "@typescript-eslint/eslint-plugin": "^5.0.0",
     "@typescript-eslint/parser": "^5.0.0",
     "@typescript-eslint/utils": "^5.0.0",
+    "depcheck": "^1.4.7",
     "eslint": "^8.0.0",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-etc": "^2.0.3",