91 lines
2.9 KiB
Markdown
91 lines
2.9 KiB
Markdown
# Opting into Angular Ivy with Angular CLI
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[Starting with Angular version 8](https://blog.angular.io/a-plan-for-version-8-0-and-ivy-b3318dfc19f7) you can opt-in to the new [Angular Ivy compilation and rendering pipeline].
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## Starting a new project using Ivy
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To start a new project with Ivy enabled, use the `--enable-ivy` flag with the [`ng new`](cli/new) command:
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```sh
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ng new shiny-ivy-app --enable-ivy
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```
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Everything will be configured for you:
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- `enableIvy` set to `true` in `src/tsconfig.app.json`.
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- `"aot": true` added to your default build options.
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- `postinstall` script for the [Angular Compatibility Compiler](#ngcc).
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{@a updating}
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## Updating an existing project to use Ivy
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By configuring a few key files, you can also update your existing project(s) to use Ivy.
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- Add the `allowEmptyCodegenFiles` (needed only before version 8 final) and `enableIvy` options in the `angularCompilerOptions` in your project's `src/tsconfig.app.json`:
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```json
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{
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"compilerOptions": { ... },
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"angularCompilerOptions": {
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"enableIvy": true,
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"allowEmptyCodegenFiles": true,
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}
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}
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```
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- Set the default build options for your project to always use AOT compilation if it isn't already:
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```json
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{
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"projects": {
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"my-existing-project": {
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"architect": {
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"build": {
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"options": {
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...
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"aot": true,
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}
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}
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}
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}
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}
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}
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```
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- Add a `postinstall` script to the workspace `package.json` file to run the [Angular Compatibility Compiler](#ngcc):
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```json
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{
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"scripts": {
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...
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"postinstall": "ivy-ngcc"
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}
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}
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```
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- Reinstall your `package.json` dependencies to run the newly added script:
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```
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npm install
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```
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## Switching back to the current compiler
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To stop using the Ivy compiler you need to undo the steps taken when [updating to use Ivy](#updating).
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- Set `enableIvy` to false in `src/tsconfig.app.json`, or remove it completely.
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- Remove `"aot": true` from your default build options if you didn't have it there before.
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- Remove the `postinstall` script.
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- Delete and reinstall your node modules.
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{@a ngcc}
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## The Angular Compatibility Compiler
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Your third party libraries also need to be compiled with Ivy for you to use them in your Ivy application.
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That's where the Angular Compatibility (`ngcc`) compiler comes into play.
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We set it as a postinstall script in your `package.json` so that it always runs when you install
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your `package.json` dependencies.
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Using a postinstall hook to run `ngcc` is just a temporary integration.
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We expect `ngcc` to be seamlessly integrated into the Angular CLI build pipeline in the future before the full Ivy rollout.
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Once that's implemented `ngcc` will not be visible to developers.
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Until that happens, opting into Ivy means that all projects in a single CLI workspace will be compiled with Ivy.
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Note: we are aware of build-time performance issues with ngcc. Please bear with us while we improve the tooling and build integration in the Angular CLI.
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