We classified this failure as an environment issue unrelated to the PR. The error originates in a stale e2e-utils dist artifact missing the toRuntimePath export — a build environment problem entirely outside the scope of the substring → slice optimization changes in @tanstack/router-core. No changes to this PR are needed to resolve it.
Self-Healing CI
Classification: Environment state
An empty commit was applied to the branch to trigger a new CI pipeline execution to resolve the environment issue.
The failing task is tanstack-vue-start-e2e-basic:test:e2e--vite-ssr--shard-2-of-4, which belongs to a project not touched by this PR.
The PR exclusively modifies @tanstack/history and @tanstack/router-core as part of a substring → slice string operation optimization — it has no overlap with the Vue Start e2e test infrastructure or the e2e-utils package.
The error is a SyntaxError indicating that the compiled dist artifact at e2e/e2e-utils/dist/esm/index.js attempts to import an export named toRuntimePath from ./to-runtime-path.js, but that export does not exist in the built file.
This points to a stale or incorrectly compiled build artifact in the environment — not something introduced by the PR changes.
Additionally, the flakiness rate for this task is 0%, ruling out a flaky test classification. The similar failure check against branch 7981 found no matching failure, indicating this is not a widespread pre-existing regression but rather a localized environment artifact issue.