When using the lodash array functions which support property passing (ie, keyBy, some) aren't type safe. This recently resulted in me breaking code in a refactor. Her is an example of code that works when running the function, but not when providing a parameter string:

// works
_.keyBy(x, 'b');
// fails
_.keyBy(x, i => i.b);
// works
_.some(x, 'b');
// fails
_.some(x, i => i.b);

Here is a stackblitz with the code above so you can see it properly: https://stackblitz.com/edit/typescript-x5knvm?file=index.ts