TL;DR declare is used to tell the compiler “this thing (usually a variable) exists already, and therefore can be referenced by other code, also there is no need to compile this statement into any JavaScript”. Common Use Case: You add a reference to your web page to a JavaScript file that the compiler knows nothing … Read more
While readonly does not directly affect whether types are assignable, it does affect whether they are identical. To test whether two types are identical, we can abuse either (1) the assignability rule for conditional types, which requires that the types after extends be identical, or (2) the inference process for intersection types, which throws out … Read more
Can someone give a simple definition of what Record is? A Record<K, T> is an object type whose property keys are K and whose property values are T. That is, keyof Record<K, T> is equivalent to K, and Record<K, T>[K] is (basically) equivalent to T. Is Record<K,T> merely a way of saying “all properties on … Read more
You can observe the full response instead of the content only. To do so, you have to pass observe: response into the options parameter of the function call. http .get<MyJsonData>(‘/data.json’, {observe: ‘response’}) .subscribe(resp => { // Here, resp is of type HttpResponse<MyJsonData>. // You can inspect its headers: console.log(resp.headers.get(‘X-Custom-Header’)); // And access the body directly, … Read more