type B<U> = {
key: string
} & Record<string, U>
const example: B<boolean> = {
key: '123',
testKey: false
}
// Error: TS2322: Type { key: string; testKey: boolean; } is not assignable to type B Type { key: string; testKey: boolean; } is not assignable to type Record<string, boolean> Property key is incompatible with index signature. Type string is not assignable to type boolean
What causes this error and how can a type be defined with one value as a string and the rest as specified?
The error message is appearing because there is an overlap between Record<string, T> and id: string, as both use the key "id" but with different types.
In this situation, consider changing id: number instead of id: string. Mixing conflicting types for the same key in one type declaration is not allowed in TypeScript.
If you need a specific property like id: string, it may be better to separate it from the more generic Record<string, T> where any type can be used.
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