Void

void is a little like the opposite of any: the absence of having any type at all. You may commonly see this as the return type of functions that do not return a value:

function warnUser(): void {
  alert("This is my warning message");
}

Declaring variables of type void is not useful because you can only assign undefined or null to them:

let unusable: void = undefined;

Links:

https://www.typescriptlang.org/docs/handbook/basic-types.html#void

doc_TypeScript

2016-10-04 19:25:45

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