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import type { AstroIntegration } from 'astro';
import { readFileSync } from 'node:fs';
function getViteConfiguration() {
return {
optimizeDeps: {
include: [
'@astrojs/lit/dist/client.js',
'@astrojs/lit/client-shim.js',
'@astrojs/lit/hydration-support.js',
'@webcomponents/template-shadowroot/template-shadowroot.js',
'lit/experimental-hydrate-support.js',
],
exclude: ['@astrojs/lit/server.js'],
},
ssr: {
external: ['lit-element', '@lit-labs/ssr', '@astrojs/lit', 'lit/decorators.js'],
},
};
}
export default function (): AstroIntegration {
return {
name: '@astrojs/lit',
hooks: {
'astro:config:setup': ({ updateConfig, addRenderer, injectScript }) => {
// Inject the necessary polyfills on every page (inlined for speed).
injectScript(
'head-inline',
readFileSync(new URL('../client-shim.min.js', import.meta.url), { encoding: 'utf-8' })
);
// Inject the hydration code, before a component is hydrated.
injectScript('before-hydration', `import '@astrojs/lit/hydration-support.js';`);
// Add the lit renderer so that Astro can understand lit components.
addRenderer({
name: '@astrojs/lit',
serverEntrypoint: '@astrojs/lit/server.js',
clientEntrypoint: '@astrojs/lit/dist/client.js',
});
// Update the vite configuration.
updateConfig({
vite: getViteConfiguration(),
});
},
'astro:build:setup': ({ vite, target }) => {
if (target === 'server') {
if (!vite.ssr) {
vite.ssr = {};
}
if (!vite.ssr.noExternal) {
vite.ssr.noExternal = [];
}
if (Array.isArray(vite.ssr.noExternal)) {
vite.ssr.noExternal.push('lit');
}
}
},
},
};
}
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