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fix(history): respect initialIndex 0 in createMemoryHistory - #8828
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Walkthrough
createMemoryHistory now honors initialIndex: 0 and selects the first entry. Tests cover zero, valid nonzero, negative, out-of-range, and NaN values. A patch changeset records the behavior.
Changes: Memory history initialization
Layer / File(s)
Summary
Select and verify the initial entry packages/history/src/index.ts, packages/history/tests/createMemoryHistory.test.ts, .changeset/memory-history-initial-index-zero.md
createMemoryHistory clamps an explicit index to the available entries. Omitted or NaN indexes select the last entry. Tests check indexes 0, 1, -1, and 5, plus NaN, with three entries. A patch changeset describes the zero-index behavior.
The initial-index fix and its tests appear ready to merge after normal checks.
Pre-merge checks: 5
Check name
Status
Explanation
Title check
The title clearly and concisely describes the main change: respecting initialIndex 0 in createMemoryHistory.
Description check
The description includes all required sections, explains the bug and fix, confirms testing and AI assistance, and reports the changeset for published code.
Docstring Coverage
Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…
Linked Issues check
Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check
Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage
Explanation
Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 1 functions across 2 files.
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix review comments
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Inline comments:
Review comments at @packages/history/src/index.ts:
- Around line 642-643: Update the explicit initialIndex branch so NaN follows
the existing fallback-to-last-entry path instead of producing an invalid entry
index. Keep the current clamping behavior for valid numeric values in the
createMemoryHistory initialization flow.
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🎯 Changes
createMemoryHistory({ initialEntries: ['/a', '/b'], initialIndex: 0 })starts at/b. The truthy check treats0as unset:Switched to
!== undefinedand added a test for0,1,-1and out-of-range.AI-assisted; I reviewed and tested the change.
✅ Checklist
🚀 Release Impact
Summary by CodeRabbit
initialIndexis set to0.initialIndexis omitted or isNaN, memory history starts at the last entry.