What causes error TS2345 to appear when defining directives?

Attempting to transition an existing angular application to typescript (version 1.5.3):

Shown below is the code snippet:

  'use strict';
    angular.module('x')
    .directive('tabsPane', TabsPane)

    function TabsPane(itemTabs) {

        return {
            restrict: 'E',
            compile: compileTabs
        };

        function compileTabs(tElement) {
            var template = createTabsTemplate(); //function which i don't include here for brevity
            tElement.append(template);
        }}

Upon compiling the javascript, the following error is encountered:

error TS2345: Argument of type '(itemTabs: any) => { restrict: string; compile: (tElement: any) => void; }' is not assignable to parameter of type 'any[]'. Property 'push' is missing in type '(itemTabs: any) => { restrict: string; compile: (tElement: any) => void; }'.

An attempt was made to understand the reason behind this issue by referring to the typescript definition of angular:

It seems that typescript is assuming this definition

directive(name: string, inlineAnnotatedFunction: any[]): IModule;

However, a more suitable definition would be:

directive(name: string, directiveFactory: IDirectiveFactory): IModule;

Having limited experience with typescript, it's believed that there may be a mistake made somewhere, but relevant information could not be found through online sources.

Answer №1

When I made the switch from old JavaScript AngularJS 1.4.9 code to TypeScript 2.6 code, I encountered a similar issue. I am currently using @types/angular version 1.6.39. To resolve the problem, I included 'any' as the return type for the parameter function like so:

    angular.module("app")
      .directive("tabsPane", function TabsPane(itemTabs): any { 
            return {
                restrict: 'E',
                compile: compileTabs
            };

            function compileTabs(tElement) {
                var template = createTabsTemplate();
                tElement.append(template);
            }
       });

After making this adjustment, the error disappeared :)

Answer №2

For directives, it is essential to ensure that the compile function returns a value. In this scenario, including a straightforward return true; at the end of your compile function can effectively resolve any problems.

Answer №3

Perhaps it's necessary to update your angular.d.ts file as I noticed in the most recent version that it includes:

directive(name: string, directiveFactory: IDirectiveFactory): IModule;

This would result in something like:

.directive('myCustomer', function(){...}
after compilation

And located right beside it is:

directive(name: string, inlineAnnotatedFunction: any[]): IModule;

Which would produce something similar to

.directive('myCurrentTime', ['$interval', 'dateFilter', function($interval, dateFilter) {...}
once compiled (This was actually updated in this commit, after being a bug for a while)

Edit (assuming you have the latest angular.d.ts version)

Try specifying the return type of your function using this syntax:

var TabsPane = (itemTabs) : ng.IDirectiveFactory => {}

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