one/dist/esm/vite/plugins/criticalCSSPlugin.mjs

One is a React framework for web, iOS, and Android apps.

import { relative } from "node:path";
import { normalizePath } from "vite";

const INLINE_CSS_RE = /\.inline\.css$/;
const criticalCSSSources = /* @__PURE__ */ new Set();
let root = "";
function getCriticalCSSSources() {
	return criticalCSSSources;
}
function getCriticalCSSOutputPaths(clientManifest) {
	const outputPaths = /* @__PURE__ */ new Set();
	for (const [sourceKey, entry] of Object.entries(clientManifest)) {
		if (sourceKey.endsWith(".css") && criticalCSSSources.has(sourceKey)) {
			outputPaths.add(`/${entry.file}`);
		}
	}
	return outputPaths;
}
function criticalCSSPlugin() {
	return {
		name: "one:critical-css",
		enforce: "pre",
		configResolved(config) {
			root = config.root;
		},
		resolveId: {
			filter: { id: INLINE_CSS_RE },
			async handler(id, importer) {
				const resolved = await this.resolve(id, importer, { skipSelf: true });
				if (resolved) {
					const relativePath = normalizePath(relative(root, resolved.id));
					criticalCSSSources.add(relativePath);
					return resolved;
				}
				return null;
			}
		}
	};
}

export { criticalCSSPlugin, getCriticalCSSOutputPaths, getCriticalCSSSources };
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