build: add separate typescript config for tests

- add `tsconfig.test.json` extending base configuration
- include both source and test files in test config
- add `typecheck` script to validate test files without emit

Author: tharropoulos

package.json

@@ -98,6 +98,7 @@
     "build": "npm run build:tsc && npm run build:web:dev && npm run build:web:prod",
     "test:vitest": "vitest",
     "build:tsc": "tsc",
+    "typecheck": "tsc --noEmit -p tsconfig.test.json",
     "build:web:dev": "webpack --config webpack.config.js --mode development",
     "build:web:prod": "webpack --config webpack.config.js --mode production",
     "build:tsc:watch": "tsc --watch",

tsconfig.test.json

@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig.json",
+  "include": ["./src/**/*.ts", "./test/**/*.ts"],
+  "compilerOptions": {
+    "noEmit": true,
+    "rootDir": "."
+  }
+}