| 'use strict'; |
| const path = require('path'); |
| const fs = require('fs'); |
| const commonDir = require('commondir'); |
| const pkgDir = require('pkg-dir'); |
| const makeDir = require('make-dir'); |
| |
| const {env, cwd} = process; |
| |
| const isWritable = path => { |
| try { |
| fs.accessSync(path, fs.constants.W_OK); |
| return true; |
| } catch (_) { |
| return false; |
| } |
| }; |
| |
| function useDirectory(directory, options) { |
| if (options.create) { |
| makeDir.sync(directory); |
| } |
| |
| if (options.thunk) { |
| return (...arguments_) => path.join(directory, ...arguments_); |
| } |
| |
| return directory; |
| } |
| |
| function getNodeModuleDirectory(directory) { |
| const nodeModules = path.join(directory, 'node_modules'); |
| |
| if ( |
| !isWritable(nodeModules) && |
| (fs.existsSync(nodeModules) || !isWritable(path.join(directory))) |
| ) { |
| return; |
| } |
| |
| return nodeModules; |
| } |
| |
| module.exports = (options = {}) => { |
| if (env.CACHE_DIR && !['true', 'false', '1', '0'].includes(env.CACHE_DIR)) { |
| return useDirectory(path.join(env.CACHE_DIR, options.name), options); |
| } |
| |
| let {cwd: directory = cwd()} = options; |
| |
| if (options.files) { |
| directory = commonDir(directory, options.files); |
| } |
| |
| directory = pkgDir.sync(directory); |
| |
| if (!directory) { |
| return; |
| } |
| |
| const nodeModules = getNodeModuleDirectory(directory); |
| if (!nodeModules) { |
| return undefined; |
| } |
| |
| return useDirectory(path.join(directory, 'node_modules', '.cache', options.name), options); |
| }; |