Breeze.js typed entities

Question

Is there a way to create typed entities using Breeze in the same way that JaySvcUtil works for JayData? Does this include Typescript support - also is there general Typescri

Answer 1

Below is a page you can drop in your site to generate typescript interface definitions. The page fetches the breeze metadata then iterates through all of the types and outputs a typescript interface declaration for each type. The output of this page can then be pasted in any typescript file (*.ts) or typescript definition file (*.d.ts). Enclose the results in a module declaration if you want to namespace the interfaces: declare module northwind { ... paste interfaces here... }.

Before using the page you'll need to make one edit: change the entity manager's controller url from "api/northwind" to whatever your breeze controller's url is.

The generated interfaces have a dependency on the Knockout.js typescript definitions which you can grab here: https://github.com/borisyankov/DefinitelyTyped/tree/master/knockout/

Using the northwind example from learn.breezejs.com, the output of this definitions generator page would be something like this:

export interface Employee extends breeze.Entity {
    FirstName: KnockoutObservable;
    LastName: KnockoutObservable;
}

you could then execute a query using breeze and cast the results to an array of employees like this:

var manager = new breeze.EntityManager('api/northwind');

var query = new breeze.EntityQuery()
    .from("Employees");

manager.executeQuery(query).then(data => {
    // ***cast the results to a strongly typed array of Employee***
    var employees = data.results;
}).fail(e => {
    alert(e);  
});

below is the definitions generator page- add a new html file to your project named "definitions.html", run the project and navigate to the page.