Issues arise when certain features in the Typescript 3+ version do not seem to be functioning properly, despite being installed

I have globally installed Typescript version 3.7.3 and Visual Studio Code is using the same version, yet I am unable to access functionality specific to Typescript 3+. For example, when trying to declare a variable with the type "unknown", I encounter a compile error stating: "Cannot find name 'unknown'." However, it does appear as a suggestion in IntelliSense. How can I troubleshoot this issue?

https://i.sstatic.net/P0P9B.png

This is my tsconfig.json file:

{
 "compileOnSave": false,
 "compilerOptions": {
   "baseUrl": "./",
   "outDir": "./dist/out-tsc",
   "sourceMap": true,
   "declaration": false,
   "downlevelIteration": true,
   "emitDecoratorMetadata": true,   // Needed for Stackblitz
   "experimentalDecorators": true,
   "module": "esnext",
   "moduleResolution": "node",
   "importHelpers": true,
   "target": "es2015",
   "typeRoots": [
     "node_modules/@types"
   ],
   "lib": [
     "es2018",
     "dom"
   ]
 },
 "angularCompilerOptions": {
   "fullTemplateTypeCheck": true,
   "strictInjectionParameters": true
 }
}

Answer №1

When you install TypeScript, a version of it will also be added to your node-modules directory.

The command tsc -v will show you the globally installed version, while Visual Studio Code will have its own version of the TypeScript compiler.

To find the specific version of TypeScript being used, look in

/node-modules/typescript/package.json
.

In your project's package.json file, you can update the TypeScript version under "devDependencies":

"devDependencies": {
    ...
    "typescript": "X.X.X" <- make sure to update this.
  }

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