import type { Tagged } from 'type-fest';

/** 表示 GQL 类型的字符串 */
export type GqlType<T extends string = string> = Tagged<T, 'GqlType'>;

/** 校验 GQL 类型 */
export function formatType<T extends string = string>(type: T, simpleTypeOnly: boolean): GqlType<T> {
    if (!type || typeof type != 'string') throw new TypeError('type must be a string');
    type = type.replaceAll(/\s+/g, '') as T;
    if (!type) throw new Error('type must not be empty');
    if (simpleTypeOnly) {
        if (type.includes('[')) throw new Error('type must not contain array');
        if (type.includes('!')) throw new Error('type must not contain non-null assertion');
    }
    return type as GqlType<T>;
}