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import type { AstroComponentMetadata, NamedSSRLoadedRendererValue } from 'astro';
import { createRawSnippet } from 'svelte';
import { render } from 'svelte/server';
import { incrementId } from './context.js';
import type { RendererContext } from './types.js';
function check(Component: any) {
if (typeof Component !== 'function') return false;
// Svelte 5 generated components always accept a `$$payload` prop.
// This assumes that the SSR build does not minify it (which Astro enforces by default).
// This isn't the best check, but the only other option otherwise is to try to render the
// component, which is taxing. We'll leave it as a last resort for the future for now.
return Component.toString().includes('$$payload');
}
function needsHydration(metadata?: AstroComponentMetadata) {
// Adjust how this is hydrated only when the version of Astro supports `astroStaticSlot`
return metadata?.astroStaticSlot ? !!metadata.hydrate : true;
}
async function renderToStaticMarkup(
this: RendererContext,
Component: any,
props: Record<string, any>,
slotted: Record<string, any>,
metadata?: AstroComponentMetadata,
) {
const tagName = needsHydration(metadata) ? 'astro-slot' : 'astro-static-slot';
let children = undefined;
let $$slots: Record<string, any> | undefined = undefined;
let idPrefix;
if (this && this.result) {
idPrefix = incrementId(this.result);
}
const renderProps: Record<string, any> = {};
for (const [key, value] of Object.entries(slotted)) {
// Legacy slot support
$$slots ??= {};
if (key === 'default') {
$$slots.default = true;
children = createRawSnippet(() => ({
render: () => `<${tagName}>${value}</${tagName}>`,
}));
} else {
$$slots[key] = createRawSnippet(() => ({
render: () => `<${tagName} name="${key}">${value}</${tagName}>`,
}));
}
// @render support for Svelte ^5.0
const slotName = key === 'default' ? 'children' : key;
renderProps[slotName] = createRawSnippet(() => ({
render: () => `<${tagName}${key !== 'default' ? ` name="${key}"` : ''}>${value}</${tagName}>`,
}));
}
const result = render(Component, {
props: {
...props,
children,
$$slots,
...renderProps,
},
idPrefix,
});
return { html: result.body };
}
const renderer: NamedSSRLoadedRendererValue = {
name: '@astrojs/svelte',
check,
renderToStaticMarkup,
supportsAstroStaticSlot: true,
};
export default renderer;
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