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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 | 4x 4x 4x 4x | import { Logger } from '@nestjs/common/services/logger.service'; /** * Generates the string which packages are missing and * how to install them * * @param name The name of the packages * @param reason The reason why these packages are important * * @internal */ const MISSING_REQUIRED_DEPENDENCY = (names: string[], reason: string): string => `The "${names.join('", "')}" package${ names.length > 1 ? 's are' : ' is' } missing. Please, make sure to install the librar${ names.length > 1 ? 'ies' : 'y' } ($ npm install ${names.join(' ')}) to take advantage of ${reason}.`; /** * @internal */ const logger = new Logger('PackageLoader'); /** * Loads an optional module * * @param module The module name * @internal * * @returns {T | null} The module or null if has not found */ function optional<T = any>(module: string): T | null { try { Iif (module[0] in { '.': 1 }) { module = process.cwd() + module.substring(1); } return require(`${module}`); } catch (err) {} return null; } /** * Checks if the given packages are available and logs using the Nest Logger * which packages are not available * @param packageNames The package names * @param reason The reason why these packages are important * * @internal * * @example * // The "no_package" package is missing. Please, make sure to install the library ($ npm install no_package) to take advantage of TEST. * checkPackages(['process', 'no_package'], 'TEST') */ export function checkPackages(packageNames: string[], reason: string): any[] { const packages = packageNames.map((packageName, index) => ({ pkg: optional(packageName), index, })); const missingDependenciesNames = packages .filter((pkg) => pkg.pkg === null) .map((pkg) => packageNames[pkg.index]); Iif (missingDependenciesNames.length) { logger.error(MISSING_REQUIRED_DEPENDENCY(missingDependenciesNames, reason)); Logger.flush(); process.exit(1); } return packages.map((pkg) => pkg.pkg); } |