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docs: update aot compiler docs (#35487)

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change to aot docs to include changes after angular 9
aot is true for new applications created, also it will
be updated to aot true once app is updated using ng update

PR Close #35487
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Santosh Yadav 2020-05-02 08:51:16 +05:30 committed by Alex Rickabaugh
parent 1eba1aaf15
commit 7cc332efe6
1 changed files with 4 additions and 24 deletions
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aio/content/guide/aot-compiler.md
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@ -8,7 +8,7 @@ This guide explains how to specify metadata and apply available compiler options
<div class="alert is-helpful">
<a href="https://www.youtube.com/watch?v=kW9cJsvcsGo">Watch compiler author Tobias Bosch explain the Angular compiler</a> at AngularConnect 2016.
<a href="https://www.youtube.com/watch?v=anphffaCZrQ">Watch Alex Rickabaugh explain the Angular compiler</a> at AngularConnect 2019.
</div>
@ -43,33 +43,13 @@ Here are some reasons you might want to use AOT.
Angular offers two ways to compile your application:
* **_Just-in-Time_ (JIT)**, which compiles your app in the browser at runtime.
* **_Ahead-of-Time_ (AOT)**, which compiles your app at build time.
* **_Just-in-Time_ (JIT)**, which compiles your app in the browser at runtime. This was the default until Angular 8.
* **_Ahead-of-Time_ (AOT)**, which compiles your app and libraries at build time. This is the default since Angular 9.
JIT compilation is the default when you run the [`ng build`](cli/build) (build only) or [`ng serve`](cli/serve) (build and serve locally) CLI commands:
<code-example language="sh" class="code-shell">
ng build
ng serve
</code-example>
{@a compile}
For AOT compilation, include the `--aot` option with the `ng build` or `ng serve` command:
<code-example language="sh" class="code-shell">
ng build --aot
ng serve --aot
</code-example>
<div class="alert is-helpful">
The `ng build` command with the `--prod` meta-flag (`ng build --prod`) compiles with AOT by default.
When you run the [`ng build`](cli/build) (build only) or [`ng serve`](cli/serve) (build and serve locally) CLI commands, the type of compilation (JIT or AOT) depends on the value of the `aot` property in your build configuration specified in `angular.json`. By default, `aot` is set to `true` for new CLI apps.
See the [CLI command reference](cli) and [Building and serving Angular apps](guide/build) for more information.
</div>
## How AOT works
The Angular AOT compiler extracts **metadata** to interpret the parts of the application that Angular is supposed to manage.