Compiled TypeScript files are missing require statements for imported components

Recently delved into Angular 2 and encountered an unusual issue. I kicked off using the Angular 2 Quickstart repository on GitHub and incorporated some components with templates.

For example:

import { Component } from '@angular/core';

import { LayoutComponent } from './layout.component';

@Component({
  selector: 'app',
  template: `<layout></layout>`,
})
export class AppComponent  { name = 'Angular'; }

The transpiled TS (resulting JS file) appears like this:

"use strict";
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
    return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
var core_1 = require('@angular/core');
var AppComponent = (function () {
    function AppComponent() {
        this.name = 'Angular';
    }
    AppComponent = __decorate([
        core_1.Component({
            selector: 'app',
            template: "<layout></layout>",
        }), 
        __metadata('design:paramtypes', [])
    ], AppComponent);
    return AppComponent;
}());
exports.AppComponent = AppComponent;
//# sourceMappingURL=app.component.js.map

You can observe that there is a missing require call for the LayoutComponent, consequently, the Layout component cannot be found resulting in the absence of the layout tag (leading to a runtime JS error in the browser).

This issue persists with all my components regardless of the path (whether referencing the component in the same directory or one level below/above the current directory).

Why is tsc excluding those imports?

Answer №1

import { LayoutComponent } from './layout.component';

This code snippet showcases the usage of an import statement utilizing ES6 module syntax, completely independent from any specific framework like Angular.

Why are these imports being excluded by tsc?

The behavior exhibited by tsc is actually correct in this context. It efficiently optimizes compilation by eliminating unused symbols.

If your goal is to implement nested components, you can easily achieve this by adding the necessary components within the @NgModule configuration, specifically under the declarations section. For instance, if AppComponent serves as the root component, including LayoutComponent there will make it accessible throughout the application.

@NgModule({
    ...
    declarations: [
        AppComponent,
        LayoutComponent
    ]
})

However, it's recommended to have a single root component for better organization. In such cases, consider encapsulating LayoutComponent within a separate module like LayoutModule, and then importing it into the root module.

@NgModule({
    ...
    imports: [
        LayoutModule
    ],
    declarations: [
        AppComponent,
    ]
})

By following this approach, you ensure that LayoutComponent is readily available for use within AppComponent and across the entire application when included in the root module.

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