Upgrade Zod peer dependency to v4#327

Draft

Copilot wants to merge 13 commits intomainfrom

copilot/upgrade-to-zod-v4

Commits on May 5, 2026

Initial plan
Copilot
authored
Initial plan for Zod v4 upgrade

Copilot
and
robgruen
authored
Upgrade to Zod v4: update validate.ts to use v4 API and update peer dependencies

Copilot
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robgruen
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Fix literal type handling to support Zod v4 multi-value literals

Copilot
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robgruen
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Add comprehensive unit tests for Zod v4 integration (48 tests covering all type code paths)

Copilot
and
robgruen
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Improve test clarity: add Zod v4 note on array literal, remove unnecessary 'as any' cast

Copilot
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robgruen
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Define ZodTypeKind type alias for v4 discriminant strings; document discriminated union merging

Copilot
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robgruen
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Improve validate.ts comments: note z.core is public API; add v3 context for discriminated union merge

Copilot
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robgruen
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Potential fix for pull request finding

robgruen
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Copilot
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Potential fix for pull request finding

robgruen
and
Copilot
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fix: handle null in z.literal() — emit 'null' instead of 'any'

Copilot
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robgruen
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Fix optional field description handling, add model tests to npm test, fix appendLiteral for null

Copilot
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robgruen
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Remove dead appendLiteral helper to eliminate code duplication

Copilot
and
robgruen
authored