Unsafe assignment of any value trying to transform properties on an object

Question

I have something like this snippet:

function transformIt(value: any): any {
  ...
}

let foo: any = ...
if (typeof foo === 'object') {
  for (const property in value) {
    foo[property] = transformIt(foo[property])
  }
}

When I run eslint on this, it complains that there's an unsafe assignment of an any value but I can't figure out how to make it happy. Would appreciate any insight on this.

Answer 1

How to check if type has index signature at runtime has the answer. Thought I tried that on my own, but seems to work now.

function hasIndexSignature(v: any): v is {[index: string]: any} {
  return typeof v === 'object'
}

let foo: any = ...
if (hasIndexSignature(foo)) {
  for (const property in value) {
    foo[property] = transformIt(foo[property])
  }
}