b4130cb07a
### What Follow up for #64294 where we could preload all the JS and CSS chunks for `next/dynamic` component. * Rename `preload-css` component to `preload-chunks` and remove the filter for css chunks * Preload JS chunks with `defer` ### Why Preloading all the async chunks of `next/dynamic` can make rendering more efficiently when combined with the initial chunks. Since those chunks are splitted on client but still essential for the page #### After vs Before We can see the waterfall starts much earlier for the dynamic chunk (881.8a0e88...js) <img width="500" src="https://github.com/vercel/next.js/assets/4800338/9bab2c32-37c3-4c7a-93e2-3aa43b2ec7c8"> <img width="500" src="https://github.com/vercel/next.js/assets/4800338/0fba7499-bb69-41c4-ab72-e9952f3d7f68">
79 lines
2.6 KiB
TypeScript
79 lines
2.6 KiB
TypeScript
import { nextTestSetup } from 'e2e-utils'
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import { retry } from 'next-test-utils'
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describe('app dir - dynamic css', () => {
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const { next, skipped } = nextTestSetup({
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files: __dirname,
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skipDeployment: true,
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})
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if (skipped) {
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return
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}
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it('should preload all chunks of dynamic component during SSR', async () => {
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const $ = await next.render$('/ssr')
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const cssLinks = $('link[rel="stylesheet"][data-precedence="dynamic"]')
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expect(cssLinks.attr('href')).toContain('.css')
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const preloadJsChunks = $('link[rel="preload"]')
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expect(preloadJsChunks.attr('as')).toBe('script')
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expect(preloadJsChunks.attr('fetchpriority')).toContain(`low`)
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})
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it('should only apply corresponding css for page loaded that /ssr', async () => {
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const browser = await next.browser('/ssr')
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await retry(async () => {
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expect(
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await browser.eval(
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`window.getComputedStyle(document.querySelector('.text')).color`
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)
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).toBe('rgb(255, 0, 0)')
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// Default border width, which is not effected by bar.css that is not loaded in /ssr
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expect(
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await browser.eval(
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`window.getComputedStyle(document.querySelector('.text')).borderWidth`
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)
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).toBe('0px')
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})
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})
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it('should only apply corresponding css for page loaded in edge runtime', async () => {
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const browser = await next.browser('/ssr/edge')
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await retry(async () => {
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expect(
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await browser.eval(
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`window.getComputedStyle(document.querySelector('.text')).color`
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)
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).toBe('rgb(255, 0, 0)')
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// Default border width, which is not effected by bar.css that is not loaded in /ssr
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expect(
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await browser.eval(
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`window.getComputedStyle(document.querySelector('.text')).borderWidth`
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)
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).toBe('0px')
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})
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})
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it('should only apply corresponding css for page loaded that /another', async () => {
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const browser = await next.browser('/another')
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await retry(async () => {
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expect(
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await browser.eval(
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`window.getComputedStyle(document.querySelector('.text')).color`
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)
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).not.toBe('rgb(255, 0, 0)')
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// Default border width, which is not effected by bar.css that is not loaded in /ssr
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expect(
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await browser.eval(
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`window.getComputedStyle(document.querySelector('.text')).borderWidth`
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)
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).toBe('1px')
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})
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})
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it('should not throw with accessing to ALS in preload css', async () => {
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const output = next.cliOutput
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expect(output).not.toContain('was called outside a request scope')
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})
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})
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