Support error instance

[blond]

Sometimes it is necessary to report error with the help of special custom error.

Example:

var thr = require('throw');

// Create a new object, that prototypally inherits from the Error constructor
function MyError(message) {
  this.name = 'MyError';
  this.message = message || 'Default Message';
  this.stack = (new Error(message)).stack;
}
MyError.prototype = Object.create(Error.prototype);
MyError.prototype.constructor = MyError;

var arg = arg || thr(new MyError());

[anton-rudeshko]

I think it's better to parametrize with error constructor like this:

var arg = arg || thr(MyError, 'message %s - %s', arg1, arg2);

[blond]

It is impossible to support message format for custom error class, because constructor can contain multiple arguments.

[blond]

Added parameterization of error class.

[anton-rudeshko]

GJ 🎉 Thanks

[blond]