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void vs never

Written byPhuoc Nguyen
24 Aug, 2023
TypeScript has two types, `never` and `void`, which represent the absence of a value. While they may seem similar, it's important to know the key differences between them. Let's dive in and explore!


The `void` type represents the absence of a value. It's typically used as the return type for functions that don't return a value.
const log = (message: string): void {
In the example above, the `log` function doesn't give back any value, which means that its return type is `void`.


The `never` type represents the absence of a value that will never occur. It's handy in two scenarios:
  • When a function always throws an error.
In the following example, the `throwError` function will always throw an error and never return a value.
const throwError = (): never => {
throw new Error('Something went wrong');
  • When a function never finishes.
The code inside the `infiniteLoop` function never finishes executing because it contains an endless loop.
const infiniteLoop = (): never => {
while (true) {
// Do something indefinitely ...


When it comes to `void` and `never`, it's important to understand their distinctions. `void` represents the absence of a value that could happen, while `never` represents the absence of a value that will never happen.
To put it simply, `void` is used when a function may or may not return a value, while `never` is used when a function will never return a value.

See also

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