astro-compiler's Introduction

Astro Compiler

Astro’s Go + WASM compiler.

⚠️ Currently in beta!

Install

npm install @astrojs/compiler

Usage

Note: Public APIs are likely to change before 1.0! Use at your own discretion.

Transform `.astro` to valid TypeScript

The Astro compiler can convert .astro syntax to a TypeScript Module whose default export generates HTML.

Some notes...

TypeScript is valid .astro syntax! The output code may need an additional post-processing step to generate valid JavaScript.
.astro files rely on a server implementation exposed as astro/internal in the Node ecosystem. Other runtimes currently need to bring their own rendering implementation and reference it via internalURL. This is a pain point we're looking into fixing.

import { transform } from '@astrojs/compiler';

const result = await transform(source, {
  site: 'https://mysite.dev',
  sourcefile: '/Users/astro/Code/project/src/pages/index.astro',
  sourcemap: 'both',
  internalURL: 'astro/internal',
});

Parse `.astro` and return an AST

The Astro compiler can emit an AST using the parse method.

Some notes...

Position data is currently incomplete and in some cases incorrect. We're working on it!
A TextNode can represent both HTML text and JavaScript/TypeScript source code.
The @astrojs/compiler/utils entrypoint exposes a walk function that can be used to traverse the AST. It also exposes the is helper which can be used as guards to derive the proper types for each node.

import { parse } from '@astrojs/compiler';
import { walk, is } from '@astrojs/compiler/utils';

const result = await parse(source, {
  position: false, // defaults to `true`
});

walk(result.ast, (node) => {
  // `tag` nodes are `element` | `custom-element` | `component`
  if (is.tag(node)) {
    console.log(node.name);
  }
})