The entered type '{}' cannot be assigned to type 'Record<Key, Value>'

Here is my code snippet:

const foo = <Key extends keyof any, Value>() {
  type Rec = Record<Key, Value>
  const a: Rec = {}
}

When I try to compile this code, TypeScript throws an error on the 3rd line stating that

Type '{}' is not assignable to type 'Record<Key, Value>
. What could be causing this issue?

Answer №1

In the scenario I encountered, the generic parameter was specifically defined as string. It turned out to be acceptable to assign an empty object to Record<string, unknown>.
The reason why it didn't accept just {} is because the Key parameter could potentially be a specific string union type such as 'prop1' | 'prop2'. In such instances, the user would be required to include these properties in the object.

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