noUnusedLocals flag in tsconfig.json

 There is flag noUnusedLocals in tsconfig if it is set to true then it will give

an error if local variable is declared but never used

e.g.

const createKeyboard = (modelID: number) => {

const defaultModelID = 23;

return { type: "keyboard", modelID };

};

Here variable defaultModelID is declared but never used in code so we get error.