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warrenday/positionalProp.ts

Created January 21, 2023 12:31
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positionalProp.ts
function positionalProp<
N extends string, F extends boolean | string | number
>(name: N, fallback?: F): (
F extends false ?
string | number | false
: F extends string ? string : number
)
const x = positionalProp('foo', false) // string | number | false
const x2 = positionalProp('foo', 'hello') // string
const x3 = positionalProp('foo', 2) // number
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