找不到名称'console'.这可能是什么原因？

Question

以下代码段显示了第4行的打字稿错误:

import {Message} from './class/message';

function sendPayload(payload : Object) : any{
   let message = new Message(payload);
   console.log(message);   // LINE 4 
}

错误说:

[ts] Cannot find name 'console'.

这可能是什么原因？为什么找不到对象console？

Answer 1

您必须安装@types/node以获取节点类型,您可以通过执行以下命令来实现,

npm install @types/node --save-dev

希望这可以帮助!

Answer 2

在tsconfig.json中的compilerOptions的lib部分中添加"dom".

例:

{
    "compilerOptions": {
        "rootDir": "src",
        "outDir": "bin",
        "module": "commonjs",
        "noImplicitAny": false,
        "removeComments": true,
        "preserveConstEnums": true,
        "sourceMap": true,
        "target": "es5",
        "lib": [
            "es6",
            "dom"    <------- Add this "dom" here
        ],
        "types": [
            "reflect-metadata"
        ],
        "moduleResolution": "node",
        "experimentalDecorators": true,
        "emitDecoratorMetadata": true
    }
}

Answer 3

你可以运行npm install @types/node -D，然后你需要添加types:[ 'node']到你的tsconfig.jsonalso.

package.json

"devDependencies": {
    "@types/node": "^15.0.3"
}

tsconfig.json

{
  "compilerOptions": {
    "composite": true,
    "outDir": "./dist",
    "rootDir": ".",
    "declaration": true,
    "noImplicitAny": true,
    "esModuleInterop": true,
    "module": "commonjs",
    "target": "es6",
    "types": [
      "node"
    ],
    "lib": [
      "es6"
    ]
  },
  "exclude": [
    "node_modules",
    "dist"
  ]
}

Answer 4

只需在 tsconfig.json 文件中添加 ES6 和 DOM

"lib": ["ES6", "DOM"]