Unusual behavior, cannot find name 'Array'

I am trying to use the array functionality in angular 7 but I am facing the error saying, cannot find name 'Array'. Similarly, I am not able to use the simple array methods like push and pop.

Angular7 is not letting me initialize the variable like:

list: Array<number> = [1, 2, 3];

What is the root cause and how to resolve it?

Updated: tsconfig.js

{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "module": "es2015",
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "importHelpers": true,
    "target": "es5",
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2018",
      "dom"
    ]
  }
}

Moreover, code is compiling without error.

Mysterious Resolution: I manage to resolve the compilation error by updating the visual studio code. The issue was particularly with the visual studio code update.