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angularjs-to-angular

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AngularJS upgrade path to Angular

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# AngularJS to Angular Upgrade Path

## Organization

### angular-v1

Basic AngularJS application from https://github.com/angular/angular-seed

### angular-v1-angular-v5

Hybrid application with tests for both AngularJS and Angular

Steps taken can be found in [angular-v1-angular-v5/STEPS.md](./angular-v1-angular-v5/STEPS.md)

### src

Collection of scripts that have been useful for upgrading AngularJS to Angular.

## Notes

- [AngularJS Components / Element Directives](#angularjs-components--element-directives)
- [AngularJS Attribute Directives](#angularjs-attribute-directives)
- [AngularJS Factory Provider for Angular](#angularjs-factory-provider-for-angular)
- [Angular Service in AngularJS](#angular-service-in-angularjs)

### AngularJS Components / Element Directives

- must be changed to use closing tags

from

<app-component />

<app-component></app-component>

this change was done to follow how web components must be formatted.

### AngularJS Attribute Directives

- currently [ngUpgrade](https://github.com/angular/angular/tree/master/packages/upgrade) does not support upgrade or downgrade paths and must be rewritten.
- [ngAdapter](https://github.com/DanielSchuech/ngAdapter) extends ngUpgrade to support upgrade and downgrade paths for Angular 2. But does not work for Angular 4+ yet.

### AngularJS Factory Provider for Angular

// Class with code that does stuff
      class Foo {
        constructor(
          // dependencies
        ) {}
        ...
      }

// AngularJS Factory
      export class FooFactory {
        public static $inject: string[] = [
          // dependencies as strings
        ];

constructor(
          // dependencies
        ) {
          return new Foo(
            // dependencies
          )
        }
      }

// Angular Service placeholder
      @Injectable()
      export class FooService extends Foo {}

// function for Ahead of Time (AoT) compilation for Angular 5. Angular 6 can use () => {}
      export function fooService(injector: Injector) {
        return injector.get('fooFactory'); // name of the factory in AngularJS
      }

// provider to replace Angular Service with the AngularJS Factory
      export const fooServiceProvider = {
        deps: ['$injector'],
        provide: FooService,
        useFactory: fooService,
      }

Usage in AngularJS

import { FooFactory } from './fooFactory';

export const ng1app = angular.module('ng1app', []).factory('fooFactory', FooFactory);

Usage in Angular

import { fooServiceProvider } from './foo.service.provider';

@NgModule({
        ...
        providers: [
          fooServiceProvider,
        ],
      })
      export class AppModule {}

## Angular Service in AngularJS

@Injectable()
      export class FooService { }

// add to Angular
      @NgModule({
        providers: [
          FooService,
        ],
      })
      export class AppModule {}

// add to AngularJS
      import { downgradeInjectable } from '@angular/upgrade/static';

export const ng1app = angular.module('ng1app', []).factory(downgradeInjectable(FooService))

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