expect-type

Author: NullVoxPopuli

package.json

@@ -20,13 +20,18 @@
     "build": "tsc && vite build",
     "dev": "vite",
     "prepare": "npm run build",
-    "lint": "prettier --check .",
+    "watch:types": "tsc --noEmit --watch",
+    "lint": "concurrently 'npm:lint:*(!fix)' --names 'lint:' --prefixColors=auto",
+    "lint:types": "tsc --noEmit",
+    "lint:prettier": "prettier --check .",
     "lint:fix": "prettier --write .",
     "test": "vitest"
   },
   "devDependencies": {
     "@types/node": "^20.11.25",
     "@vitest/browser": "^1.5.3",
+    "concurrently": "^9.0.1",
+    "expect-type": "^1.0.0",
     "prettier": "^3.2.5",
     "release-plan": "^0.9.0",
     "typescript": "latest",

pnpm-lock.yaml

@@ -0,0 +1,32 @@
+/**
+ * The purpose of these tests is to make sure the types are exposed how we expect,
+ * and that we double-check what we're exposing as public API
+ */
+import {expectTypeOf} from 'expect-type';
+import {Signal} from './wrapper.ts';
+
+/**
+ * Top-Level
+ */
+expectTypeOf<keyof typeof Signal>().toMatchTypeOf<
+  'State' | 'Computed' | 'subtle' | 'isState' | 'isComputed' | 'isWatcher'
+>();
+
+let num = new Signal.State(0);
+expectTypeOf(num).toMatchTypeOf<Signal.State<number>>();
+expectTypeOf(num.get()).toMatchTypeOf<number>();
+expectTypeOf(num.set(1)).toMatchTypeOf<void>();
+
+expectTypeOf<keyof Signal.State<unknown> & string>().toEqualTypeOf<'get' | 'set'>();
+expectTypeOf<keyof Signal.Computed<unknown> & string>().toEqualTypeOf<'get'>();
+expectTypeOf<keyof typeof Signal.subtle>().toEqualTypeOf<
+  | 'untrack'
+  | 'currentComputed'
+  | 'introspectSources'
+  | 'introspectSinks'
+  | 'hasSinks'
+  | 'hasSources'
+  | 'Watcher'
+  | 'watched'
+  | 'unwatched'
+>();

src/public-api-types.ts

@@ -13,7 +13,8 @@
     "lib": ["DOM", "ES2021"],
     "strict": true,
     "composite": true,
-    "forceConsistentCasingInFileNames": true
+    "forceConsistentCasingInFileNames": true,
+    "allowImportingTsExtensions": true
   },
   "exclude": ["**/node_modules/**", "**/*.spec.ts", "**/dist/**/*"],
   "include": ["src"]