Utilize Typescript compiler to identify mistakes during object property access using square brackets

Is it possible to configure the Typescript compiler to identify errors when accessing object properties using square brackets?

I have inherited a codebase where object property access is predominantly done with square brackets (obj['myProp'] instead of obj.myProp). I need to implement type checking for this scenario. Below is an example of the code, which unfortunately does not throw any compile-time errors. Is there a way to prompt the compiler to recognize that the property 'test' does not exist?

interface IPerson{
    name: string
}

let x: IPerson

x = { name: 'John' };

let y = x['test'];

Answer №1

x['test'] is purposely exempt from scrutiny in standard compiler configurations to facilitate transitioning from Javascript, where [] conventionally enables flexible object access.

Activating noImplicitAny will prompt an error for this approach if the specified key doesn't exist within the object.

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