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

One is a new React Framework that makes Vite serve both native and web.

import { resolve } from "node:path";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
const PROJECT_ROOT = resolve("/project");
describe("criticalCSSPlugin", () => {
  beforeEach(() => {
    vi.resetModules();
  });
  afterEach(() => {
    vi.clearAllMocks();
  });
  describe("resolveId", () => {
    it("should return null for non-inline CSS imports", async () => {
      const {
        criticalCSSPlugin
      } = await import("./criticalCSSPlugin.mjs");
      const plugin = criticalCSSPlugin();
      plugin.configResolved({
        root: PROJECT_ROOT
      });
      const result = await plugin.resolveId.call({
        resolve: vi.fn()
      }, "./styles.css", resolve("/project/src/App.tsx"));
      expect(result).toBeNull();
    });
    it("should return null for non-css imports", async () => {
      const {
        criticalCSSPlugin
      } = await import("./criticalCSSPlugin.mjs");
      const plugin = criticalCSSPlugin();
      plugin.configResolved({
        root: PROJECT_ROOT
      });
      const result = await plugin.resolveId.call({
        resolve: vi.fn()
      }, "./data.json", resolve("/project/src/App.tsx"));
      expect(result).toBeNull();
    });
    it("should resolve .inline.css and track it", async () => {
      const {
        criticalCSSPlugin
      } = await import("./criticalCSSPlugin.mjs");
      const plugin = criticalCSSPlugin();
      plugin.configResolved({
        root: PROJECT_ROOT
      });
      const resolvedCssPath = resolve("/project/src/styles.inline.css");
      const mockResolve = vi.fn().mockResolvedValue({
        id: resolvedCssPath
      });
      const importerPath = resolve("/project/src/App.tsx");
      const result = await plugin.resolveId.call({
        resolve: mockResolve
      }, "./styles.inline.css", importerPath);
      expect(mockResolve).toHaveBeenCalledWith("./styles.inline.css", importerPath, {
        skipSelf: true
      });
      expect(result).toEqual({
        id: resolvedCssPath
      });
    });
    it("should track inline CSS source paths", async () => {
      const {
        criticalCSSPlugin,
        getCriticalCSSSources
      } = await import("./criticalCSSPlugin.mjs");
      const plugin = criticalCSSPlugin();
      plugin.configResolved({
        root: PROJECT_ROOT
      });
      const mockResolve = vi.fn().mockResolvedValue({
        id: resolve("/project/src/layout.inline.css")
      });
      await plugin.resolveId.call({
        resolve: mockResolve
      }, "./layout.inline.css", resolve("/project/src/App.tsx"));
      const sources = getCriticalCSSSources();
      expect(sources.has("src/layout.inline.css") || sources.has("src\\layout.inline.css")).toBe(true);
    });
    it("should return null when resolve fails", async () => {
      const {
        criticalCSSPlugin
      } = await import("./criticalCSSPlugin.mjs");
      const plugin = criticalCSSPlugin();
      plugin.configResolved({
        root: PROJECT_ROOT
      });
      const mockResolve = vi.fn().mockResolvedValue(null);
      const result = await plugin.resolveId.call({
        resolve: mockResolve
      }, "./nonexistent.inline.css", resolve("/project/src/App.tsx"));
      expect(result).toBeNull();
    });
  });
  describe("getCriticalCSSOutputPaths", () => {
    it("should map inline CSS source to output paths via manifest", async () => {
      const {
        criticalCSSPlugin,
        getCriticalCSSSources,
        getCriticalCSSOutputPaths
      } = await import("./criticalCSSPlugin.mjs");
      const plugin = criticalCSSPlugin();
      plugin.configResolved({
        root: PROJECT_ROOT
      });
      const mockResolve = vi.fn().mockResolvedValue({
        id: resolve("/project/app/layout.inline.css")
      });
      await plugin.resolveId.call({
        resolve: mockResolve
      }, "./layout.inline.css", resolve("/project/app/_layout.tsx"));
      const sources = getCriticalCSSSources();
      const sourceKey = [...sources].find(s => s.includes("layout.inline.css"));
      const manifest = {
        [sourceKey]: {
          file: "assets/layout-abc123.css",
          src: sourceKey
        },
        "app/_layout.tsx": {
          file: "assets/layout-def456.js",
          css: ["assets/layout-abc123.css"],
          imports: [],
          name: "_layout"
        }
      };
      const outputPaths = getCriticalCSSOutputPaths(manifest);
      expect(outputPaths.has("/assets/layout-abc123.css")).toBe(true);
    });
    it("should return empty set when no inline CSS exists", async () => {
      const {
        getCriticalCSSOutputPaths
      } = await import("./criticalCSSPlugin.mjs");
      const manifest = {
        "app/styles.css": {
          file: "assets/styles-abc.css"
        }
      };
      const outputPaths = getCriticalCSSOutputPaths(manifest);
      expect(outputPaths).toBeDefined();
    });
  });
  describe("plugin metadata", () => {
    it("should have correct name", async () => {
      const {
        criticalCSSPlugin
      } = await import("./criticalCSSPlugin.mjs");
      const plugin = criticalCSSPlugin();
      expect(plugin.name).toBe("one:critical-css");
    });
    it("should enforce pre", async () => {
      const {
        criticalCSSPlugin
      } = await import("./criticalCSSPlugin.mjs");
      const plugin = criticalCSSPlugin();
      expect(plugin.enforce).toBe("pre");
    });
  });
});
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