Cannot find name 'console'. What could be the reason for this?

Cannot find name 'console'. What could be the reason for this?

The following snippet shows a typescript error at LINE 4:

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

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

The error says:

[ts] Cannot find name 'console'.

What could be the reason for this? Why it cannot find the object console?

You will have to install the @types/node to get the node typings, You can achieve that by executing the below command,

npm install @types/node --save-dev

Add "dom" in your lib section in compilerOptions in tsconfig.json.

Example:

{
    "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
    }
}

You can run npm install @types/node -D, and then you need to add types:[ 'node'] into your tsconfig.json also.

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"
  ]
}

just add ES6 and DOM in your tsconfig.json file

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

you can also use the same values as in @tBlabs answer from command line, and you don't need to install anything beside typescript:

tsc test.ts --lib esnext,dom

you separate values with comma and you don't need esnext for console.log to work.

I had the same problem in node terminal. Adding node to the types field of tsconfig.json solved my issue

It seems you are using typescript so here are the steps you need to do.

1. Install global tsc using

npm I typescript --global

2. call tsc --init if you don't have a tsconfig.json already in your folder

3. If you have a tsconfig.json in the lib consider including DOM like this

 "lib": ["DOM" ...],     

Confirm that you don't import console from anything. like:

import { console } from 'console'; // Confirm you haven't a statement like this.

ReferenceURL : https://stackoverflow.com/questions/42105984/cannot-find-name-console-what-could-be-the-reason-for-this