vue hello world项目
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3 years ago
'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);
};