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2. Enum and Union types overriding

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Selene edited this page Mar 30, 2023 · 1 revision

Cuetsy allows to override parent values when we are extending the interfaces.

  • You can override a union type value with another different as long it belongs to the parent union type.
  • You can set a value from the parent type.
  • You can set a default value from the parent type.

Union type overriding

CUE TypeScript 
UnionType:         "a" | "b" | "c"             @cuetsy(kind="type")
ExtendedUnionType: "d" | "e" | "f" | UnionType @cuetsy(kind="type")

Parent: {
  defaultValue:     ExtendedUnionType
  myUnionType:      ExtendedUnionType
  myUnionTypeValue: ExtendedUnionType
} @cuetsy(kind="interface")

Interface: {
  Parent
  defaultValue:     ExtendedUnionType & (*"e" | _)
  myUnionType:      UnionType
  myUnionTypeValue: ExtendedUnionType & "e"
} @cuetsy(kind="interface")

export type UnionType = ('a' | 'b' | 'c');
export type ExtendedUnionType = ('d' | 'e' | 'f' | UnionType);

export interface Parent {
  defaultValue:     ExtendedUnionType;
  myUnionType:      ExtendedUnionType;
  myUnionTypeValue: ExtendedUnionType;
}

export interface Interface {
  defaultValue:     UnionType;
  myUnionType:      UnionType;
  myUnionTypeValue: 'e';
}

export const defaultInterface = {
  defaultValue: 'e',
};

Enum type overriding

CUE TypeScript 
Enum: "a" | "b" | "c" @cuetsy(kind="enum")

Parent: {
  defaultValue: Enum
  enumValue:    Enum
} @cuetsy(kind="interface")

Interface: {
  Parent
  defaultValue: Enum & (*"a" | _)
  enumValue:    Enum & "a"
} @cuetsy(kind="interface")

export enum Enum {
  A = 'a',
  B = 'b',
  C = 'c',
}

export interface Parent {
  defaultValue: Enum;
  enumValue:    Enum;
}

export interface Interface {
  defaultValue: Enum;
  enumValue:    Enum.A;
}

export const defaultInterface = {
  defaultValue: Enum.A,
};
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