static get idColumn() {
    return ['id'] as const;
}

TS2417: Class static side typeof Base incorrectly extends base class static side typeof Model
Types of property idColumn are incompatible.
Type string | readonly string[] is not assignable to type string | string[]
Type readonly string[] is not assignable to type string | string[]
The type readonly string[] is readonly and cannot be assigned to the mutable type string[

  export class Model {
    static idColumn: string | string[];