myapp/node_modules/@schematics/angular/environments/schema.d.ts

/**
 * Generates and configures environment files for your project. Environment files allow you
 * to define different settings and configurations for various environments, such as
 * development, testing, and production. This schematic helps you create and manage these
 * files, making it easier to customize your application's behavior for each environment.
 */
export type Schema = {
    /**
     * The name of the project where the environment files should be created or updated.
     */
    project: string;
};