Here is the code snippet:
const handleNodes = (node: Node | Node[]) => {
if (Array.isArray(node)) {
return [{}];
}
return {};
};
The desired result is:
handleNodes([{}]) // infer that this returns an array
handleNodes({}) // infer that this returns an object
Is there a way to achieve this? I attempted to utilize conditional types, but faced some challenges.
In case the number of arguments remains constant with each function call, you can utilize function overloading as demonstrated below:
type DemoNode = {
id?: string;
};
// Define different function signatures with respective return types
function handleNodes(node: DemoNode): DemoNode
function handleNodes(node: DemoNode[]): DemoNode[]
// Function implementation
function handleNodes(node: DemoNode | DemoNode[]) {
if (Array.isArray(node)) {
return [{}];
}
return {};
}
const res1 = handleNodes([]);
// ^? const res1: DemoNode[]
const res2 = handleNodes({});
// ^? const res2: DemoNode
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