This repository demonstrates a common TypeScript error: passing an array to a function expecting a string argument. The code attempts to use an array as a string argument, resulting in a type error. The solution involves type checking and handling the array appropriately before passing it to the function.
The greeter function expects a string argument. However, the user variable is an array of strings. Calling greeter with user results in a compilation error because TypeScript detects the type mismatch.