import { builtinModules } from '@flex-development/builtin-modules'

/**
 * Set containing the names of modules provided by Node.js.
 *
 * **Note**: Includes [`node:` URLs][1].
 *
 * [1]: https://nodejs.org/api/esm.html#node-imports
 *
 * @const {Set<string>} BUILTIN_MODULES
 */
const BUILTIN_MODULES = new Set(builtinModules.flatMap(m => [m, 'node:' + m]))

/**
 * Checks if the given module `name` is the name of a [builtin module][1].
 *
 * Allows for [`node:` URLs][2].
 *
 * [1]: https://nodejs.org/api/esm.html#builtin-modules
 * [2]: https://nodejs.org/api/esm.html#node-imports
 *
 * @example
 *  isBuiltin('node:module') // true
 * @example
 *  isBuiltin('fs/promises') // true
 * @example
 *  isBuiltin('@flex-development/builtin-modules') // false
 *
 * @param {string} name - Module name to evaluate
 * @return {boolean} `true` if `name` is name of builtin module
 */
const isBuiltin = (name: string): boolean => BUILTIN_MODULES.has(name)

console.debug(isBuiltin('node:module'))
console.debug(isBuiltin('fs/promises'))
console.debug(isBuiltin('@flex-development/builtin-modules'))