@gqlts/runtime
Version:
Gqlts runtime client
47 lines • 2.36 kB
TypeScript
type Scalar = string | number | Date | boolean | null | undefined;
type FieldsToRemove = '__alias' | '__isUnion' | '__scalar' | '__name';
type Nil = undefined | null;
/**
* FieldsSelection is a recursive type that creates a response type based on request type and fields
*/
export type FieldsSelection<SRC, DST> = {
tuple: DST extends Nil ? never : DST extends readonly [any, infer PAYLOAD] ? FieldsSelection<SRC, PAYLOAD> : never;
scalar: SRC;
union: Handle__isUnion<SRC>;
object: HandleObject<SRC, DST>;
array: SRC extends Nil ? never : SRC extends (infer T)[] ? Array<FieldsSelection<T, DST>> : never;
__scalar: Handle__scalar<SRC, DST>;
never: never;
}[DST extends Nil ? 'never' : SRC extends Nil ? 'never' : DST extends readonly [any, any] ? 'tuple' : DST extends false | 0 ? 'never' : SRC extends Scalar ? 'scalar' : SRC extends any[] ? 'array' : SRC extends {
__isUnion?: any;
} ? 'union' : DST extends {
__scalar?: any;
} ? '__scalar' : DST extends {} ? 'object' : 'never'];
/**
* HandleObject processes object types in the selection
*/
type HandleObject<SRC, DST> = SRC extends Nil ? never : Pick<{
[Key in keyof SRC]: Key extends keyof DST ? FieldsSelection<NonNullable<SRC[Key]>, NonNullable<DST[Key]>> : SRC[Key];
}, Extract<Exclude<keyof DST, FieldsToRemove>, keyof SRC>> & HandleAliases<SRC, DST>;
type HandleAliases<SRC, DST> = DST extends {
__alias?: infer ALIASES;
} ? ALIASES extends Record<keyof any, any> ? {
[Alias in keyof ALIASES]: HandleAlias<SRC, ALIASES[Alias]>;
} : {} : {};
type HandleAlias<SRC, ALIAS> = {
[Key in Extract<keyof ALIAS, keyof SRC>]: FieldsSelection<NonNullable<SRC[Key]>, NonNullable<ALIAS[Key]>>;
}[Extract<keyof ALIAS, keyof SRC>];
/**
* Handle__scalar adds all scalar properties excluding non-scalar props
*/
type Handle__scalar<SRC, DST> = SRC extends Nil ? never : Pick<{
[Key in keyof SRC]: Key extends keyof DST ? FieldsSelection<SRC[Key], DST[Key]> : SRC[Key];
}, {
[Key in keyof SRC]: SRC[Key] extends Nil ? never : Key extends FieldsToRemove ? never : SRC[Key] extends Scalar ? Key : Key extends keyof DST ? Key : never;
}[keyof SRC]>;
/**
* Handle__isUnion processes union types in the selection
*/
type Handle__isUnion<SRC> = SRC extends Nil ? never : Omit<SRC, FieldsToRemove>;
export {};
//# sourceMappingURL=typeSelection.d.ts.map