test: typescript

Author: gr2m

package.json

@@ -6,7 +6,9 @@
   "types": "./index.d.ts",
   "scripts": {
     "build": "tsc src/index.ts --declaration --outDir .",
-    "test": "jest --coverage"
+    "test": "npm run -s test:code && npm run -s test:typescript",
+    "test:code": "jest --coverage",
+    "test:typescript": "npx tsc --noEmit --declaration --noUnusedLocals test-typescript.ts"
   },
   "repository": "github:gr2m/javascript-plugin-architecture-with-typescript-definitions",
   "keywords": [

test-typescript.ts

@@ -0,0 +1,22 @@
+// ************************************************************
+// THIS CODE IS NOT EXECUTED. IT IS JUST FOR TYPECHECKING
+// ************************************************************
+
+import { Base } from "./src";
+
+function isString(what: string) {}
+
+// sets .options types from constructor options
+const base = new Base({ option: "value" });
+isString(base.options.option);
+
+// sets .options types from Base.defaults({})
+const BaseWithDefaults = Base.defaults({ parentOption: "value" });
+const baseWithDefaults = new BaseWithDefaults({ childOption: "value" });
+
+isString(baseWithDefaults.options.childOption);
+// see #32
+isString(baseWithDefaults.options.parentOption);
+
+// @ts-expect-error see #31
+baseWithDefaults.unknown;