Add OpenAPI 3.1 support: null type, type arrays#9
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nolannbiron
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Mar 5, 2026
nolannbiron
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- Add support for type: 'null' as a standalone type
- Add support for type arrays (e.g. type: ['string', 'null']) by converting to anyOf
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Pull request overview
This PR adds OpenAPI 3.1 support to the validator compiler by implementing:
type: 'null'as a standalone schema type that validates a value is strictlynulltypearrays (e.g.type: ['string', 'null']) which are converted to ananyOfschema internally
Changes:
- Added
OpenAPINullSchemaandOpenAPITypeArraySchemainterfaces to the type system; madeitemsoptional onOpenAPIArraySchema - Added
compileNullTypeSchemaandcompileTypeArraySchemacompiler functions and handled the new'null'case in theswitchstatement - Added snapshot tests for the three new cases (
type: 'null',type: ['string', 'null'],type: ['string', 'number']); updated snapshot URL
Reviewed changes
Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.
Show a summary per file
| File | Description |
|---|---|
src/types.ts |
Adds OpenAPINullSchema and OpenAPITypeArraySchema interfaces; makes items optional on OpenAPIArraySchema |
src/compileValueSchema.ts |
Adds compileNullTypeSchema, compileTypeArraySchema functions, array-type detection, and !schema.items early-return guard |
src/tests/compileValueSchema.test.ts |
Adds snapshot tests for null type and type-array schemas |
src/tests/__snapshots__/compileValueSchema.test.ts.snap |
Adds generated snapshots for the three new test cases |
src/tests/__snapshots__/compiler.test.ts.snap |
Updates the Bun snapshot header URL from a shortened link to the canonical docs URL |
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…tems - Add support for type: 'null' as a standalone type - Add support for type arrays (e.g. type: ['string', 'null']) by converting to anyOf - Make array schema items optional to handle arrays without item constraints - Add OpenAPINullSchema and OpenAPITypeArraySchema types
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SamyPesse
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Mar 6, 2026
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| * OpenAPI 3.1: type: 'null' as a standalone type. |
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We'll have to test this one well, because I'm wondering if we actually get null as an input value.
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