node.js 获取错误 TS2304：找不到名称“缓冲区”
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Getting error TS2304: Cannot find name 'Buffer'
提问by ayyappa maddi
I am trying to do base64 encode in NodeJS using TypeScript.
我正在尝试使用 TypeScript 在 NodeJS 中进行 base64 编码。
Following code working fine in JavaScript.
以下代码在 JavaScript 中运行良好。
When I am writing same thing in TypeScript and compiling, I am getting Buffer is not find error.
当我在 TypeScript 中编写相同的内容并进行编译时，出现 Buffer is not find 错误。
var base64Policy = new Buffer(stringPolicy, 'utf-8').toString('base64');
Can someone help me to do same thing in TypeScript.
有人可以帮我在 TypeScript 中做同样的事情吗？
回答by DarkKnight
Add this line at top:
在顶部添加此行：
declare const Buffer
and it should compile without errors.
它应该编译没有错误。
Declarations is required to use node built in libraries or other global objects, you can manually declare it like above.
使用节点内置库或其他全局对象需要声明，您可以像上面一样手动声明。
With new version of Typescript, you can also use official declaration files:
使用新版本的 Typescript，您还可以使用官方声明文件：
npm i -g typescript@next
npm i --save-dev @types/node
for other libraries, install @types/library_name.
对于其他库，请安装@types/library_name.
more details: Improve Declaration File Acquisition, The Future of Declaration Files
回答by Benny Neugebauer
Prologue
序幕
Bufferis part of the Node.js API. Because TypeScript doesn't know classes from Node.js by default, you will need to install declaration files(type definitions) for Node.js.
Buffer是Node.js API 的一部分。因为默认情况下 TypeScript 不知道来自 Node.js 的类，所以您需要为 Node.js安装声明文件（类型定义）。
If you see the following error, you will have to install type definitions manually:
如果您看到以下错误，则必须手动安装类型定义：
error TS2304: Cannot find name 'Buffer'.
错误 TS2304：找不到名称“缓冲区”。
Installing Type Definitions
安装类型定义
You can install type definitions using the typingstool. I will show you how to do this:
您可以使用typings工具安装类型定义。我会告诉你如何做到这一点：
Install the
typingstool with npm:npm install -g typingsInstall type definitions for Node.js from the DefinitelyTyped(
~dt) repository:typings install dt~node --global --save
typings使用 npm安装该工具：npm install -g typings从绝对类型(
~dt) 存储库安装 Node.js 的类型定义：typings install dt~node --global --save
The typings tool will create the following directory "typings/globals/node" and link it in "typings/index.d.ts". There will be also a file called typings.json(because of the --saveoption), which references the resolved type definitions:
打字工具将创建以下目录“ typings/globals/node”并将其链接到“ typings/index.d.ts”中。还将有一个名为typings.json（由于--save选项）的文件，它引用解析的类型定义：
{
"globalDependencies": {
"node": "registry:dt/node#6.0.0+20160621231320"
}
}
Note: If you see the error "typings\globals\node\index.d.ts(71,26): error TS1110: Type expected", then your Node.js definition is too recent. The typings tool has issues with latest type declarations. In such a case, just check the version in your typings.jsonfile. For me node#6.0.0+20160621231320was working but node#6.0.0+20161212163245was not.
注意：如果您看到错误“typings\globals\node\index.d.ts(71,26): error TS1110: Type expected”，那么您的 Node.js 定义太新了。类型工具在最新类型声明方面存在问题。在这种情况下，只需检查typings.json文件中的版本即可。对我来说node#6.0.0+20160621231320是工作但node#6.0.0+20161212163245不是。
- Now all you have to do is adding
index.d.tsas a triple-slash directivewithin your code (which uses theBufferclass):
- 现在您所要做的就是在您的代码（使用该类）中添加
index.d.ts一个三斜杠指令Buffer：
YourClass.ts
你的类.ts
/// <reference path="../../typings/index.d.ts" />
export class YourClass {
private static toString(encoded: string): string {
return new Buffer(encoded, "base64").toString();
}
}
UPDATE:
更新：
With the release of TypeScript 2.0a new type definitions system has been announced.
随着TypeScript 2.0的发布，发布了一个新的类型定义系统。
You can now forget about the typingstool. All you need to do is running this command to install TypeScript definitions for Node.js:
您现在可以忘记该typings工具了。你需要做的就是运行这个命令来为 Node.js安装TypeScript 定义：
npm install --save @types/node
npm install --save @types/node
Please also make sure that you have the following entries in your tsconfig.json:
还请确保您的 中有以下条目tsconfig.json：
{
"compilerOptions": {
"moduleResolution": "node",
...
},
"exclude": [
"node_modules",
...
]
}
P.S. If you need type definitions for other classes (than included in Node.js), you can search for them here: http://microsoft.github.io/TypeSearch/
PS 如果你需要其他类的类型定义（而不是包含在 Node.js 中），你可以在这里搜索它们：http: //microsoft.github.io/TypeSearch/
回答by Jay Pagnis
For the IONIC 4 developers, I installed it usingnpm install --save @types/node
When I tried adding "types": ["node"]as shown below
对于 IONIC 4 开发人员，我使用npm install --save @types/node
当我尝试添加时安装它"types": ["node"]，如下所示
"compilerOptions": {
"outDir": "./out-tsc/app",
"types": ["node"]
},
to the tsconfig.json
it did not work. I had to add the entry totsconfig.app.json
Please refer to the following link for relevant documentation.
https://github.com/aws/aws-sdk-js/issues/1271#issuecomment-291658668
Let me know if that worked for you!
到tsconfig.json
它没有工作。我不得不将条目添加到tsconfig.app.json
请参阅以下链接以获取相关文档。
https://github.com/aws/aws-sdk-js/issues/1271#issuecomment-291658668
让我知道这是否对你有用！
回答by abedfar
Buffer is from Nodenamespace. First install
缓冲区来自Node命名空间。首先安装
npm install --save @types/node
npm install --save @types/node
then add below code to your tsconfig.jsonfile inside the compilerOptionssection
然后将以下代码添加到tsconfig.json该compilerOptions部分内的文件中
"types": ["node"],
"typeRoots": ["node_modules/@types"]
The typeRootsentry specifies a list of directories for type definition files to be included. It requires TypeScriptversion 2.0 or later.
该typeRoots条目指定要包含的类型定义文件的目录列表。它需要TypeScript2.0 或更高版本。
