[gre]

The cookbook e2e passed even when nothing was drawn: it ignored WebGL errors and tolerated a missing canvas. examples/next-js wasn't built by any workflow.

Changes

e2e (pnpm e2e and pnpm e2e:prod)

• Chromium runs on SwiftShader with a fake camera, so shaders and webcam examples really run.
• Each example's first canvas must draw at least 4 distinct colors, with no uncaught error, console error or same-origin HTTP failure.
• In development a shader error is an overlay rather than an exception, so the test also fails on that overlay.
• paint starts blank, so the test draws on it first. It's the only special case.
• imgur images are replaced by a local file, so an imgur outage can't fail the suite. As a result, the real remote URLs are not tested.
• Example ids are read from src/examples/index.ts, so a new example can't be left out.
• A new test goes from the home page to examples through links, and checks that the page doesn't reload.

Next.js example

• ci-next-js.yml builds it and checks that the page renders (pnpm e2e:next).
• This found a real crash when building inside this repository: Cannot destructure property 'glSurface' of 'this.context'. A copy outside the repository rendered fine, so Next was using the repository root as the project root. examples/next-js/next.config.js now sets the root to the example. I didn't determine exactly why that root breaks the page.

actionlint

• ci-actionlint.yml checks workflow changes on PRs. It reports nothing on the current workflows.

Testing

Locally, on macOS:

• pnpm e2e: 51/51, twice. pnpm e2e:prod: 51/51, twice. pnpm e2e:next: passes.
• Blank shader in hellogl: fails in dev with Expected: >= 4, Received: 1.
• Shader compile error in hellogl: fails in dev on the overlay, and in production on a page error and a blank canvas.

Not tested:

• What each example should look like: the check only proves that several colors are drawn, not that they are the right ones.
• Canvases after the first one in an example.
• Interactions other than drawing on paint.

No changeset: the cookbook is private, and the Next.js example isn't published.

🤖 Generated with Claude Code

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