The code as posted in the question cannot generate that error, because Project
is not a user-defined function / valid constructor.
function x(a,b,c){}
new x(1,2,3); // produces no errors
You’ve probably done something like this:
function Project(a,b,c) {}
Project = {}; // or possibly Project = new Project
new Project(1,2,3); // -> TypeError: Project is not a constructor
Variable declarations using var
are hoisted and thus always evaluated before the rest of the code. So, this can also be causing issues:
function Project(){}
function localTest() {
new Project(1,2,3); // `Project` points to the local variable,
// not the global constructor!
//...some noise, causing you to forget that the `Project` constructor was used
var Project = 1; // Evaluated first
}