prisma-markdown/src/utils/MapUtil.ts

Prisma Markdown documents generator including ERD diagrams and comment descriptions

export namespace MapUtil {
    export const take =
        <Key, T>(dict: Map<Key, T>) =>
        (key: Key, generator: () => T): T => {
            const oldbie: T | undefined = dict.get(key);
            if (oldbie) return oldbie;

            const value: T = generator();
            dict.set(key, value);
            return value;
        };
}