Bundling and minifying Angular2 assets

In the world of ASP.NET (or gulp), bundling and minification are taken care of. However, a different issue arises when following Angular2 tutorials: the view HTML is typically embedded within the component itself. Fortunately, there is a way to separate the HTML into its own .ts and .html files using TypeScript. Here's how:

...
/// <reference path="./view-declaration.d.ts" />
...
import {html} from '/app.html!text';
...
@Component({
    ...
    template: html
})
...

To fake .html as a module in the view-declaration.d.ts file:

declare module '/app.html!text' {
    var html:string;
    return default html;
}

This method utilizes SystemJS with its text plugin. However, it does not generate System.register for .html files, preventing the bundling of HTML files along with transpiled .js files.

The question remains – how can you separate HTML from JavaScript while still bundling them properly?

It's important to note that this approach is similar to setting the templateUrl on your component, both of which hinder bundling and increasing server hits per component. Angular2 suggests using strings and setting template directly on a component instead. This solution may be more practical for junior developers and code reviews (as opposed to running the whole codebase just to see if the browser complains about a non-closed tag!).

Answer №1

Check out this amazing gulp plugin that I believe can resolve your issue. Take a look here: https://example.com/gulp-inline-ng2-template

One great advantage is that you can maintain a clean HTML file by using the templateUrl feature during development. This task can also be integrated into your production or staging environment as part of your minified gulp build task.

Here's a snippet from my own build tasks:

var inlineNg2Template = require('gulp-inline-ng2-template');
gulp.task('build-prod', ['build.lib'], function () {
    var tsProject = typescript.createProject('./tsconfig.json', {typescript: require('typescript')});
    var tsSrcInlined = gulp.src([webroot + '**/*.ts'], { base: webroot })
        .pipe(inlineNg2Template({ base: webroot }));
    return eventStream.merge(tsSrcInlined, gulp.src('Typings/**/*.ts'))
        .pipe(sourcemaps.init())
        .pipe(typescript(tsProject))
        .pipe(sourcemaps.write())
        .pipe(gulp.dest(webroot));
}); 

Answer №2

It has been discovered that for development purposes, utilizing templateUrl is necessary, but it should be switched to template when bundling and reducing file size. Here's a useful gulp task for this process:

var gulp = require('gulp'); //make sure to install 'gulp' using npm
var uglify = require('gulp-uglify'); //install 'gulp-uglify' via npm
var concat = require('gulp-concat'); //get 'gulp-concat' from npm
var replace = require('gulp-replace'); //use 'gulp-replace' after installing via npm
var fs = require("fs"); //Visual Studio and NodeJS already provides 'fs'

gulp.task('bundle:js', function () {
    return gulp
        .src([
            "file3.js",
            "file4.js"
        ])
        .pipe(replace(/templateUrl.*\'/g, function (matched) {
            var fileName = matched.match(/\/.*html/g).toString();
            var fileContent = fs.readFileSync(fileName, "utf8");
            return 'template:\'' + fileContent.replace(/\r\n/g, '') + '\'';
        }))
        .pipe(concat('minified-file.min.js'))
        .pipe(gulp.dest('bundle directory'))
        .pipe(uglify())
        .pipe(gulp.dest('bundle directory'));
});

This gulp task efficiently handles matching .html files with the template URL, and can be adjusted as needed.

Answer №3

Your app's template file app.html.ts is able to export the HTML template as a string.

export const htmlTemplate = `
    <p>Welcome to my app</p>
`;

Subsequently, your component (app.component.ts) can import the template directly within the code.

import { Component } from '@angular/core';
import { htmlTemplate } from './app.html';

@Component({
    selector: 'my-app',
    template: htmlTemplate,
})
...

This method:

  • permits the inlining of templates during compilation, avoiding the need for an additional network request that using "templateUrl" requires and enabling templates to be minified and bundled along with other JS files
  • allows templates to reside in external files for better code organization and scalability
  • can be seamlessly transitioned to a standard HTML file once TypeScript's "import file as string" feature becomes available
  • ensures proper Webstorm syntax highlighting for HTML continues to function correctly

Check out this blog post by Angular University

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