cannot find name ‘require’ in angular 7(typescript 3.1.3)

The problem also remained after adding it to my tsconfig.json, but additionaly adding the following line to tsconfig.app.json resolved it for me:

{
"compilerOptions": {
    "types": ["node"]
}

So be sure to add this into both files ./tsconfig.json AND ./src/tsconfig.app.json and it should work.