frontend/src/gql/Utils.ts


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import { omit } from '$lib/Utils';
import type { Client } from '@urql/svelte';
import * as gql from './graphql';

type Typename = '__typename';
type Identifiers = Typename | 'id';

export type OmitTypename<T> = Omit<T, Typename>;
export type OmitIdentifiers<T> = Omit<T, Identifiers>;
export type RequiredName<T> = T & { name: string };
export type MutationWith<T> = (
	client: Client,
	args: { ids: number[] | number; input: T }
) => Promise<unknown>;

export function omitIdentifiers<T extends { __typename?: unknown; id: number }>(
	obj: T
): OmitIdentifiers<T> {
	return omit(obj, '__typename', 'id');
}

export function isSuccess(object: any): object is gql.Success {
	if (object.__typename === undefined) {
		return false;
	}

	return object.__typename.endsWith('Success') && (object as gql.Success).message !== undefined;
}

export function isError(object: any): object is gql.Error {
	if (object.__typename === undefined) {
		return false;
	}
	return object.__typename.endsWith('Error') && (object as gql.Error).message !== undefined;
}