Add schema.json for JSONC (webpro-nl#320)

* feat: separate schema

* Revert "feat: separate schema"

This reverts commit 8b7bd4f.

* feat: add gitignore

* docs: update jsonc

* feat: add jsonc schema to package.json

* feat: jsonc schema

* chore: simplify docs

* Update packages/docs/src/content/docs/reference/configuration.md

Co-authored-by: Lars Kappert <lars@webpro.nl>

* Update packages/docs/src/content/docs/reference/configuration.md

Co-authored-by: Lars Kappert <lars@webpro.nl>

* Update packages/docs/src/content/docs/reference/configuration.md

Co-authored-by: Lars Kappert <lars@webpro.nl>

---------

Co-authored-by: Lars Kappert <lars@webpro.nl>

Author: Zamiell

.gitignore

@@ -0,0 +1 @@
+node_modules

packages/docs/src/content/docs/reference/configuration.md

@@ -9,14 +9,26 @@ configure Knip.
 
 ## JSON Schema
 
-In JSON, you can use the provided JSON Schema:
+A "$schema" field is a URL that you put at the top of your JSON file. This allows you to get red squiggly lines inside of your IDE when you make a typo or provide an otherwise invalid configuration option.
+
+In JSON, you can use the provided JSON schema:
 
 ```json title="knip.json"
 {
   "$schema": "https://unpkg.com/knip@3/schema.json"
 }
 ```
 
+In JSONC, you can use the provided JSONC schema:
+
+```json title="knip.jsonc"
+{
+  "$schema": "https://unpkg.com/knip@3/schema-jsonc.json"
+}
+```
+
+Use JSONC if you want to use comments and/or trailing commas.
+
 ## Types
 
 In TypeScript, you can use the `KnipConfig` type:

packages/knip/package.json

@@ -25,7 +25,7 @@
     "knip:production": "node ./dist/cli.js --directory ../.. --production --strict",
     "lint": "eslint scripts src test",
     "lint:fix": "eslint scripts src test --fix",
-    "format": "prettier scripts src test schema.json --with-node-modules --write",
+    "format": "prettier scripts src test schema.json schema-jsonc.json --with-node-modules --write",
     "pretest": "node rmdir.js tmp && swc src -d tmp/src && swc test -d tmp/test",
     "test": "node --no-warnings --test tmp",
     "coverage": "c8 --reporter html node --no-warnings --loader tsx --test test/*.test.ts test/*/*.test.ts",
@@ -35,11 +35,12 @@
     "qa": "npm run lint && npm run build && npm run knip && npm run knip:production && npm test",
     "release": "release-it",
     "create-plugin": "tsx --no-warnings ./scripts/create-new-plugin.ts",
-    "postcreate-plugin": "prettier schema.json src/ConfigurationValidator.ts --write --config .prettierrc --log-level silent"
+    "postcreate-plugin": "prettier schema.json schema-jsonc.json src/ConfigurationValidator.ts --write --config .prettierrc --log-level silent"
   },
   "files": [
     "dist",
-    "schema.json"
+    "schema.json",
+    "schema-jsonc.json"
   ],
   "dependencies": {
     "@ericcornelissen/bash-parser": "0.5.2",

packages/knip/schema-jsonc.json

@@ -0,0 +1,11 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "Knip configuration for JSONC",
+  "description": "See https://github.com/webpro/knip",
+  "allOf": [
+    {
+      "$ref": "https://unpkg.com/knip@3/schema.json"
+    }
+  ],
+  "allowTrailingCommas": true
+}

packages/knip/schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
-  "title": "Knip configuration",
+  "title": "Knip configuration for JSON",
   "description": "See https://github.com/webpro/knip",
   "type": "object",
   "allOf": [