typescript increases value for any datatype using pipe (|)

I have declare a variable of type any. While assigning the values as per below & I am printing it on console, so its updating the value from 50 to 51.  I am using pipe (|) symbol Please help me & guide me if anything I am doing wrong.  let myVariable: any;   myVariable = "hello";   console.log("1 condition: " + myVariable);   myVariable = 20;   console.log("2 condition: " + myVariable);   myVariable = 50 | true | "false";   console.log("3 condition: " + myVariable);   Thanks