When updating Cloudflare Pages build to v3, the build failed. Cloudflare Pages v1 used Ubuntu20 with default Yarn v1.22.4 while Cloudflare Pages v3 is using Ubuntu22 with default Yarn v1.22.22.
Setting YARN_VERSION=1.22.4 in Cloudflare succeed again with Pages build v3.
(Nodejs version was also automatically bumped to 22.16.0 but that doesn't seem cause any trouble)
Node version can be pinned with .node-version but Cloudflare doesn't support reading yarn version from the repo yet.
So, no immediate issue but we have an old yarn version that will keep getting older hardcoded in Cloudflare.
2026-07-09T08:57:35.665406Z Error: Exit with error code: 1
2026-07-09T08:57:35.66581Z at ChildProcess.<anonymous> (/snapshot/dist/run-build.js)
2026-07-09T08:57:35.665916Z at Object.onceWrapper (node:events:652:26)
2026-07-09T08:57:35.666006Z at ChildProcess.emit (node:events:537:28)
2026-07-09T08:57:35.666068Z at ChildProcess._handle.onexit (node:internal/child_process:291:12)
2026-07-09T08:57:35.672537Z Failed: build command exited with code: 1
2026-07-09T08:57:36.484437Z Failed: error occurred while running build command
When updating Cloudflare Pages build to v3, the build failed. Cloudflare Pages v1 used Ubuntu20 with default Yarn v1.22.4 while Cloudflare Pages v3 is using Ubuntu22 with default Yarn v1.22.22.
Setting
YARN_VERSION=1.22.4in Cloudflare succeed again with Pages build v3.(Nodejs version was also automatically bumped to 22.16.0 but that doesn't seem cause any trouble)
Node version can be pinned with
.node-versionbut Cloudflare doesn't support reading yarn version from the repo yet.So, no immediate issue but we have an old yarn version that will keep getting older hardcoded in Cloudflare.