In TypeScript, at what level should the timeout be specified?

I'm currently working on writing a debounce function in TypeScript, but I'm feeling uncertain about the type that should be assigned to a variable used with setTimeout. This is the snippet of my code:

function debounced(func: () => void, wait: number) {
    // What should be the type of 'timeout' variable here?
    let timeout: any;
    return () => {
        if (timeout) {
            clearTimeout(timeout);
        }
        timeout = setTimeout(() => {
            func();
        }, wait);
    };
}

Answer №1

To ensure your code is easily transferable between a node.js and browser setting, consider utilizing the return type of setTimeout in the following manner:

let timeoutType: ReturnType<typeof setTimeout>;

This is beneficial as the return type may differ between node.js and browser environments.

Answer №2

When it comes to Typescript, custom type definitions take precedence over default types.

If the tsconfig.json file specifies types: node, it means that Typescript will use the setTimeout(): NodeJS.Timeout definition from node_modules/@types/node instead of the default setTimeout(): number functionality.

"compilerOptions": {
    "types": [
      "node",
      ...
    ]
}

If you do not specifically require that type declaration, you can remove it to get rid of this error:

"compilerOptions": {
}

Answer №3

To fix this issue when using the browser, make sure to specifically use window.setTimeout.

Answer №4

If you want to ensure that TypeScript's setTimeout is being used, consider utilizing window.setTimeout instead of the standard setTimeout function.

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