@nx/eslint-plugin/src/utils/config-utils.d.ts

The eslint-plugin package is an ESLint plugin that contains a collection of recommended ESLint rule configurations which you can extend from in your own ESLint configs, as well as an Nx-specific lint rule called enforce-module-boundaries.

/**
 * Checks if package is available
 * @param name name of the package
 * @returns
 */
export declare function packageExists(name: string): boolean;