[v6 - Cloudflare]: Server Island this.result.serverIslandNameMap.get is not a function regression in dev server #16045
Description
Astro Info
Astro v6.0.8
Node v25.8.1
System macOS (arm64)
Package Manager pnpm
Output static
Adapter @astrojs/cloudflare
Integrations none
If this issue only occurs in one browser, which browser is a problem?
All.
Describe the Bug
After starting the dev server, if the first page we visit does not contain the server island, an error will be thrown when we navigate to a page with a server island.
TypeError: this.result.serverIslandNameMap.get is not a function
at ServerIslandComponent.getIslandContent (/Users/jimmy/Documents/astro-v6-prerender/node_modules/.pnpm/astro@6.0.8_rollup@4.60.0/node_modules/astro/dist/runtime/server/render/server-islands.js:110:55)
at ServerIslandComponent.init (/Users/jimmy/Documents/astro-v6-prerender/node_modules/.pnpm/astro@6.0.8_rollup@4.60.0/node_modules/astro/dist/runtime/server/render/server-islands.js:52:32)
at bufferHeadContent (/Users/jimmy/Documents/astro-v6-prerender/node_modules/.pnpm/astro@6.0.8_rollup@4.60.0/node_modules/astro/dist/runtime/server/render/astro/render.js:131:37)
at renderToAsyncIterable (/Users/jimmy/Documents/astro-v6-prerender/node_modules/.pnpm/astro@6.0.8_rollup@4.60.0/node_modules/astro/dist/runtime/server/render/astro/render.js:148:11)
at async renderPage (/Users/jimmy/Documents/astro-v6-prerender/node_modules/.pnpm/astro@6.0.8_rollup@4.60.0/node_modules/astro/dist/runtime/server/render/page.js:68:24)
at async lastNext (/Users/jimmy/Documents/astro-v6-prerender/node_modules/.pnpm/astro@6.0.8_rollup@4.60.0/node_modules/astro/dist/core/render-context.js:259:25)
at async callMiddleware (/Users/jimmy/Documents/astro-v6-prerender/node_modules/.pnpm/astro@6.0.8_rollup@4.60.0/node_modules/astro/dist/core/middleware/callMiddleware.js:11:10)
at async RenderContext.render (/Users/jimmy/Documents/astro-v6-prerender/node_modules/.pnpm/astro@6.0.8_rollup@4.60.0/node_modules/astro/dist/core/render-context.js:293:73)
at async AstroServerApp.render (/Users/jimmy/Documents/astro-v6-prerender/node_modules/.pnpm/astro@6.0.8_rollup@4.60.0/node_modules/astro/dist/core/app/base.js:348:20)
at async run (/Users/jimmy/Documents/astro-v6-prerender/node_modules/.pnpm/astro@6.0.8_rollup@4.60.0/node_modules/astro/dist/vite-plugin-app/app.js:138:26)
However, if the first page we load contains the server island, there will be no error even if we navigate to a page without the server island and then go back.
In the reproducible example, try first go to localhost:4321, then click on the link that takes to page with server island, and error should appear.
However, if you shut down the server, and restart, then reload the page with server island, no error will appear.
Probably related: #15886
What's the expected result?
No error should be thrown.
Link to Minimal Reproducible Example
https://github.com/CaiJimmy/astro-v6-prerender
Participation
- I am willing to submit a pull request for this issue.