1、pkg-dir
'use strict';
const path = require('path');
const findUp = require('find-up');
const pkgDir = async cwd => {
const filePath = await findUp('package.json', {cwd});
return filePath && path.dirname(filePath);
};
module.exports = pkgDir;
// TODO: Remove this for the next major release
module.exports.default = pkgDir;
module.exports.sync = cwd => {
//该库用于在某个目录下向上找指定文件,找到返回该文件路径,找不到返回null
//接收两个参数 第一要寻找的文件,第二个 路径
const filePath = findUp.sync('package.json', {cwd});
return filePath && path.dirname(filePath);
};
2、find-up
'use strict';
const path = require('path');
const locatePath = require('locate-path');
const pathExists = require('path-exists');
const stop = Symbol('findUp.stop');
module.exports = async (name, options = {}) => {
let directory = path.resolve(options.cwd || '');
const {root} = path.parse(directory);
const paths = [].concat(name);
const runMatcher = async locateOptions => {
if (typeof name !== 'function') {
return locatePath(paths, locateOptions);
}
const foundPath = await name(locateOptions.cwd);
if (typeof foundPath === 'string') {
return locatePath([foundPath], locateOptions);
}
return foundPath;
};
// eslint-disable-next-line no-constant-condition
while (true) {
// eslint-disable-next-line no-await-in-loop
const foundPath = await runMatcher({...options, cwd: directory});
if (foundPath === stop) {
return;
}
if (foundPath) {
return path.resolve(directory, foundPath);
}
if (directory === root) {
return;
}
directory = path.dirname(directory);
}
};
module.exports.sync = (name, options = {}) => {
let directory = path.resolve(options.cwd || '');
const {root} = path.parse(directory);
const paths = [].concat(name);
//运行匹配器
const runMatcher = locateOptions => {
if (typeof name !== 'function') {
//当前库的作用就是判断某个文件名称(带后缀)数组中是否有一个文件是否在某个目录下,
//如果在,则返回这个文件名称(带后缀),如果不在则返回undefined
return locatePath.sync(paths, locateOptions);
}
const _l=locateOptions
const foundPath = name(locateOptions.cwd);
if (typeof foundPath === 'string') {
return locatePath.sync([foundPath], locateOptions);
}
return foundPath;
};
// eslint-disable-next-line no-constant-condition
while (true) {
const foundPath = runMatcher({...options, cwd: directory});
if (foundPath === stop) {
return;
}
if (foundPath) {
//如果foundPath存在,返回相对路径
return path.resolve(directory, foundPath);
}
if (directory === root) {
return;
}
directory = path.dirname(directory);
}
};
module.exports.exists = pathExists;
module.exports.sync.exists = pathExists.sync;
module.exports.stop = stop;