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flying-hero 96f6318101 📦 添加虚拟环境和启动脚本

新增:
- backend/venv/ - Python 虚拟环境
- backend/start.sh - 启动脚本（使用虚拟环境）
- backend/requirements.txt - 依赖列表
- .gitignore - 忽略虚拟环境和缓存文件

说明:
- 每个项目使用独立虚拟环境
- 避免依赖冲突
- 启动脚本自动创建和激活虚拟环境

2026-04-04 18:29:02 +08:00

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path-exists

Check if a path exists

NOTE: fs.existsSync has been un-deprecated in Node.js since 6.8.0. If you only need to check synchronously, this module is not needed.

While fs.exists() is being deprecated, there's still a genuine use-case of being able to check if a path exists for other purposes than doing IO with it.

Never use this before handling a file though:

In particular, checking if a file exists before opening it is an anti-pattern that leaves you vulnerable to race conditions: another process may remove the file between the calls to fs.exists() and fs.open(). Just open the file and handle the error when it's not there.

Install

$ npm install path-exists

Usage

// foo.js
const pathExists = require('path-exists');

(async () => {
	console.log(await pathExists('foo.js'));
	//=> true
})();

API

pathExists(path)

Returns a Promise<boolean> of whether the path exists.

pathExists.sync(path)

Returns a boolean of whether the path exists.

path-exists-cli - CLI for this module

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