React Native 异常：var tmpDir = req

首先看下错误信息，提示tmpDir 不是一个方法。

/Users/mac/AndroidStudioProjects/source/reactnative/react-weather/node_modules/node-haste/lib/Cache/index.js:22
var tmpDir = require('os').tmpDir();
                           ^

TypeError: require(...).tmpDir is not a function
    at Object.<anonymous> (/Users/mac/AndroidStudioProjects/source/reactnative/react-weather/node_modules/node-haste/lib/Cache/index.js:22:28)
    at Module._compile (node:internal/modules/cjs/loader:1101:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
    at Object.require.extensions.<computed> [as .js] (/Users/mac/AndroidStudioProjects/source/reactnative/react-weather/node_modules/babel-register/lib/node.js:152:7)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Module.require (node:internal/modules/cjs/loader:1005:19)
    at require (node:internal/modules/cjs/helpers:94:18)
    at Object.<anonymous> (/Users/mac/AndroidStudioProjects/source/reactnative/react-weather/node_modules/node-haste/lib/index.js:15:13)
    at Module._compile (node:internal/modules/cjs/loader:1101:14)

在根据报错的路径找下去，路径/node_modules/node-haste/lib/Cache/index.js:22的代码正是：

var tmpDir = require('os').tmpDir();

发现是这个tmpDir方法变了，应该是tmpdir，所以改下这里的源码即可。

var tmpDir = require('os').tmpdir();

至于为啥要这么改可以看看别人总结的 利用nodejs获取当前操作系统的数据参数 文章。