Typescript compilation error with Arrays

Question

There are two typescript files:

a module that implements the class Client

export class Client {

a main file that imports the module and creates an array of clients

import c = module("client")
//...
class Server {
    constructor() {
        this.clients = new c.Client[];

Compiling the code seems to work fine. But when I try to run the generated javascript with nodejs, it complains that there is a syntax error:

this.clients = new ();

On the client side there's typescript code, too. But instead of modules, I'm using declaration paths and the --out compiler flag to compile everything into one .js file. Arrays in the client-side code are created without problems. In the javascript there's

this.arr = new Array();

So obviously the compiler just forgot to add specify that an Array is created with new(). I fixed the error manually by just inserting the missing part. But after a small change to the code and a new compilation, the same problem appeared again. I'm using typescript version 0.8.3 and installed via npm. What can I do ?

Jeffery Grajkowski · Accepted Answer · 2013-03-06 16:38:02Z

3

I assume your class Server defines clients to be an array of c.Client objects so it actually looks like this:

class Server {
    clients: c.Client[];
    constructor() {
        this.clients = new c.Client[];
    }
}

I'm not sure why this code compiled at all because it's actually a syntax error. It doesn't compile for me.

You mixed up two different ways to declare an array: new Array() and []. Just change your line to this and you should be good to go:

this.clients = [];

answered Mar 6, 2013 at 16:38

Jeffery Grajkowski

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1 Comment

lhk Over a year ago

interesting. on the client side the exact same code worked fine. Therefore i always assumed that the syntax was valid. Unfortunately the solution has either revealed or created a new problem. Well, that's not the scope of this question and I gladly accept your answer. +1 by me

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