@nestjs/config/dist/utils/create-config-factory.util.js

Configuration for NestJS: load .env files and custom configuration, validate it at startup, and read it through an injectable ConfigService.

import { randomUUID } from 'crypto';
import { getConfigToken } from './get-config-token.util.js';
/**
 * @publicApi
 */
export function createConfigProvider(factory) {
    return {
        provide: factory.KEY || getConfigToken(randomUUID()),
        useFactory: factory,
        inject: [],
    };
}