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Construct and validate discriminated union schemas in Zod with literal and enum discriminators, optionsMap indexing, and discriminator issue reporting

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CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17

ゴール: Construct and validate discriminated union schemas in Zod with literal and enum discriminators, optionsMap indexing, and discriminator issue reporting HOW
パッケージ: zod 3.24.2
環境: node
作成日: 2026-08-17T13:38:58Z

z.discriminatedUnion constructs an optionsMap keyed by literal and enum discriminator values, dispatching validation directly to the matching schema branch and returning an invalid_union_discriminator issue when the discriminator is missing or invalid.
Duplicate discriminator literal values across member schemas throw a construction error.
Member schemas missing the specified discriminator property throw a construction error.
Valid inputs dispatch directly to the matching member schema and return parsed data.
Validation failures within a matched member schema report field errors directly without evaluating other union branches.
Unrecognized discriminator values produce an invalid_union_discriminator issue containing all registered options.
Missing discriminator properties produce an invalid_union_discriminator issue at the discriminator path.
Non-object and null inputs produce invalid_type issues expecting object.
Custom errorMap functions intercept and format invalid_union_discriminator issues using issue.options.

node 22 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9