TypeScript error TS5023: Unknown compiler option 'strict'

Question

When using the option "strict" in tsconfig.json file, I get the error:

error TS5023: Unknown compiler option 'strict'

But this compiler option is clearly allowed in the official documentation:

Reference: https://www.typescriptlang.org/docs/handbook/compiler-options.html

And also my Visual Studio Code editor.

Does anyone know what I did wrong? Here is my tsconfig.json file:

{
  "compilerOptions": {
    "strict": true,
    "sourceMap":  true
  }
}

Answer 1

You need the latest version.

Specifically, you need TypeScript@>=2.3

For project level installation (recommended)

npm install --dev typescript@latest

If you use tsc via the global command line

npm install --global typescript@latest

To override the version used by VS Code to use your global installation

1. Open user settings

2. Change it as follows (replace my name with yours)

   // Place your settings in this file to overwrite the default settings
   {
     "typescript.tsdk": "C:/Users/Aluan/AppData/Roaming/npm/node_modules/typescript/lib",
      //..
   

3. If you are running Linux or OSX the path will be something like

   "~/npm/node_modules/typescript/lib"
   

That said, the latest VS Code should ship with TypesScript@>3 so you shouldn't need to do anything except update it...

Other package managers:

JSPM:

command line:

jspm install --dev typescript@latest

VS Code project level settings:

{
  "typescript.tsdk": "./jspm_packages/npm/typescript@latest/lib"
}

Yarn:

command line:

yarn add --dev typescript@latest

VS Code project level settings:

{
  "typescript.tsdk": "./node_modules/typescript/lib"
}