typescript 打字稿：__dirname 值？
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TypeScript: __dirname value?
提问by Ng2-Fun
My folder structure is like this:
我的文件夹结构是这样的：
- app
- tsFolder
- XX.ts
- tsFolder
- 应用程序
- 文件夹
- XX.ts
- 文件夹
Code in XX.ts file:
XX.ts 文件中的代码：
var __dirname: string;
console.log("__dirname: " + __dirname); // the output is undefined.
I have tried it: by comment out the code var __dirname: string;, the value of __dirnameis: ...../appinsead of pointing to the current folder like ...../app/tsFolder.
我试过了：通过注释掉代码var __dirname: string;，它的值__dirname是：...../appinsead 指向当前文件夹，如...../app/tsFolder.
Can anyone explain it?
谁能解释一下？
回答by Daniel Rosenwasser
Just run
赶紧跑
npm install --save-dev @types/node
And if that doesn't work on its own, add
如果这本身不起作用，请添加
"types": ["node"]
to your tsconfig.json's compilerOptionsfield.
到你tsconfig.json的compilerOptions领域。
回答by Amid
I assume you refer to nodejs global variable __dirname.
我假设您指的是 nodejs 全局变量__dirname。
If it points to the ..../app it means that your XX.ts is compiled to the ..../app folder. And when resulting js file is run - __dirname points to its (js file) location.
如果它指向 ..../app 则意味着您的 XX.ts 已编译到 ..../app 文件夹。当生成的 js 文件运行时 - __dirname 指向它的（js 文件）位置。
And of course you should not declare new var __dirname. Instead either use nodejs typingsor just declare it manually like this:
当然，您不应该声明新的 var __dirname。相反，无论是使用的NodeJS分型或只是手动声明它是这样的：
declare var __dirname;
回答by U_R_Naveen UR_Naveen
I have tried npm i @types/node with no change in tsconfig . You make sure that working directory path length must be less than windows maximum limit.
我已经尝试过 npm i @types/node 没有改变 tsconfig 。您确保工作目录路径长度必须小于 Windows 最大限制。
