What is the best way to organize an Angular library for multiple import paths similar to @angular/material, and what advantages does this approach offer?

When importing different modules from @angular/material, each module is imported from a unique package path, following the format of

@organization/library/<module>
. For example:

import { MatSidenavModule } from '@angular/material/sidenav';
import { MatSnackBarModule } from '@angular/material/snack-bar';
import { MatSortModule } from '@angular/material/sort';
import { MatTableModule } from '@angular/material/table';
import { MatProgressSpinnerModule } from '@angular/material/progress-spinner';

Queries:

  1. How can this method be implemented in a library?

    I have a similar folder structure where each module has its own directory containing components/services/directives, and a public-api.ts file exporting all members. Additionally, there is a main barrel file at the root level that exports everything. When used in applications, modules are imported as follows:

import { FooModule, BarModule } from '@my-org/my-lib'

// Instead of

import { FooModule } from '@my-org/my-lib/foo'
import { BarModule } from '@my-org/my-lib/bar'
  1. What advantages does this approach offer compared to exporting all members directly from the root @my-org/my-lib path (if any)?

Answer №1

Explore Secondary Entry Points

Through my exploration, I discovered a strategy known as Secondary Entry Points that can achieve this goal. It's a technique employed by the Angular team with @angular/core and @angular/material libraries.

To address my initial inquiries:

  1. Secondary Entry Points involve creating multiple smaller bundles within the library which can be loaded individually, allowing for unique dependencies to be specified for each entry point. This essentially creates mini-libraries within the larger library structure, optimizing resource allocation.

  2. Reduced bundle sizes are the primary advantage of utilizing Secondary Entry Points, as it maximizes Angular's tree shaking capabilities to eliminate unnecessary dependencies and streamline the application bundle size.

  • For instance, many users may only utilize a specific set of @angular/material UI components. By selectively importing modules relevant to these components, excess styling and logic from unused components are avoided in the final app bundle.
  • Moreover, only essential dependencies for selected entry points are included, preventing the inclusion of unnecessary dependencies in the application bundle.

As mentioned in the referenced source below:

"Using subentries allows us to distribute our library across multiple chunks, which can be efficiently optimized during Angular's build process. This method ensures that third-party libraries not used in the application are excluded from the final bundle."

Source of Inspiration:

This article on Angular In Depth elaborates on the implementation and advantages of leveraging Secondary Entry Points in Angular libraries.

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