Using TypeScript's union type to address compatibility issues

Below is a small example I've created to illustrate my problem:

interface testType {
    id: number
}

let t: testType[] = [{
    id: 1
}]

t = t.map(item => ({
    ...item,
    id: '123'
}))

Imagine that the testType interface is sourced externally and cannot be modified. I need to append a new array of objects where the id field is not of type number. I want to achieve this without creating a new variable, but by utilizing the existing variable t.

Answer №1

interface exampleInterface {
    identifier: number
}

type uniqueType = Omit<exampleInterface, "identifier"> & {identifier: string | exampleInterface["identifier"]}

let u: uniqueType[] = [{
    identifier: 1
}]

u = u.map(element => ({
    ...element,
    identifier: '123'
}))

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