I have a collector function like

const track = (data: Record<string, any>) => {
  //...
}

and some data generators like

const genData = () => ({
  name: 'x'
})

Currently the track function could accept genData() and genData as parameter without warning, and it is likely to make some mistakes.

So how to throw warning when accept a Function?

CodePudding user response：

You can apply validator which forbids an argument if it will be a function:

type NotFn<T extends Record<string, any>> =
    T extends (...args: any[]) => any ? never : T

const track = <
    Data extends Record<string, any>
>(data: NotFn<Data>) => { }

const genData = () => ({
    name: 'x'
})

track(genData)

Playground

You can find more information about TS negation in my article

CodePudding user response：

If you want to only allow objects but don't know the type of the values, you can use Record<string, unknown>.

const track = (data: Record<string, unknown>) => {}

track(genData)
// Error: Index signature for type 'string' is missing in type '() => { name: string; }'

Playground