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import type { AstroConfig } from 'astro';
import { pathToFileURL } from 'node:url';
import type { PluginContext } from 'rollup';
import slash from 'slash';
import type { Plugin, ResolvedConfig } from 'vite';
import type { IntegrationOptions } from './index.js';
import type { InputFormat } from './loaders/index.js';
import { metadata } from './utils/metadata.js';
export interface ImageMetadata {
src: string;
width: number;
height: number;
format: InputFormat;
}
export function createPlugin(config: AstroConfig, options: Required<IntegrationOptions>): Plugin {
const filter = (id: string) =>
/^(?!\/_image?).*.(heic|heif|avif|jpeg|jpg|png|tiff|webp|gif)$/.test(id);
const virtualModuleId = 'virtual:image-loader';
let resolvedConfig: ResolvedConfig;
let loaderModuleId: string;
async function resolveLoader(context: PluginContext) {
if (!loaderModuleId) {
const module = await context.resolve(options.serviceEntryPoint);
if (!module) {
throw new Error(`"${options.serviceEntryPoint}" could not be found`);
}
loaderModuleId = module.id;
}
return loaderModuleId;
}
return {
name: '@astrojs/image',
enforce: 'pre',
configResolved(viteConfig) {
resolvedConfig = viteConfig;
},
async resolveId(id) {
// The virtual model redirects imports to the ImageService being used
// This ensures the module is available in `astro dev` and is included
// in the SSR server bundle.
if (id === virtualModuleId) {
return await resolveLoader(this);
}
},
async load(id) {
// only claim image ESM imports
if (!filter(id)) {
return null;
}
const meta = await metadata(id);
const fileUrl = pathToFileURL(id);
const src = resolvedConfig.isProduction
? fileUrl.pathname.replace(config.srcDir.pathname, '/')
: id;
const output = {
...meta,
src: slash(src), // Windows compat
};
return `export default ${JSON.stringify(output)}`;
},
};
}
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