dewey92 · October 9, 2018 20:45
diff --git a/ts-interface.ts b/ts-interface.ts
 interface ProductModel {
  id: number;
  name: string;
  price: number;
  tax: number
 }

 const getFinalPrice = (product: ProductModel) =>
  product.price + product.tax;

 getFinalPrice({ id: 1, name: 'A', price: 1, tax: 0.5 });
 // OK

 getFinalPrice({});
 // Argument of type '{}' is not assignable to parameter of type 'ProductModel'.
 //  Property 'id' is missing in type '{}'.
	interface ProductModel {
	id: number;
	name: string;
	price: number;
	tax: number
	}

	const getFinalPrice = (product: ProductModel) =>
	product.price + product.tax;

	getFinalPrice({ id: 1, name: 'A', price: 1, tax: 0.5 });
	// OK

	getFinalPrice({});
	// Argument of type '{}' is not assignable to parameter of type 'ProductModel'.
	// Property 'id' is missing in type '{}'.
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