fix(zod): generate z.discriminatedUnion for multi-value discriminator mappings

.changeset/fix-zod-discriminated-union-multi-value.md

@@ -0,0 +1,5 @@
+---
+'@hey-api/openapi-ts': patch
+---
+
+fix(zod): generate z.discriminatedUnion when discriminator maps multiple values to the same schema

packages/openapi-ts-tests/zod/v3/__snapshots__/3.0.x/mini/discriminator-mapped-many-number/zod.gen.ts

@@ -0,0 +1,16 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+import * as z from 'zod/v4-mini';
+
+export const zBar = z.object({
+    code: z.optional(z.union([z.literal(1), z.literal(2)]))
+});
+
+export const zBaz = z.object({
+    code: z.optional(z.literal(3))
+});
+
+export const zFoo = z.discriminatedUnion('code', [
+    z.extend(zBar, { code: z.union([z.literal(1), z.literal(2)]) }),
+    z.extend(zBaz, { code: z.literal(3) })
+]);

packages/openapi-ts-tests/zod/v3/__snapshots__/3.0.x/mini/discriminator-mapped-many/zod.gen.ts

@@ -0,0 +1,21 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+import * as z from 'zod/v4-mini';
+
+export const zBar = z.object({
+    foo: z.optional(z.enum(['one', 'two']))
+});
+
+export const zBaz = z.object({
+    foo: z.optional(z.enum(['three']))
+});
+
+export const zSpæcial = z.object({
+    foo: z.optional(z.enum(['four']))
+});
+
+export const zFoo = z.discriminatedUnion('foo', [
+    z.extend(zBar, { foo: z.enum(['one', 'two']) }),
+    z.extend(zBaz, { foo: z.literal('three') }),
+    z.extend(zSpæcial, { foo: z.literal('four') })
+]);

packages/openapi-ts-tests/zod/v3/__snapshots__/3.0.x/v3/discriminator-mapped-many-number/zod.gen.ts

@@ -0,0 +1,17 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+import { z } from 'zod';
+
+export const zBar = z.object({
+    code: z.union([z.literal(1), z.literal(2)]).optional()
+});
+
+export const zBaz = z.object({
+    code: z.literal(3).optional()
+});
+
+export const zFoo = z.discriminatedUnion('code', [
+    zBar.extend({ code: z.literal(1) }),
+    zBar.extend({ code: z.literal(2) }),
+    zBaz.extend({ code: z.literal(3) })
+]);

packages/openapi-ts-tests/zod/v3/__snapshots__/3.0.x/v3/discriminator-mapped-many/zod.gen.ts

@@ -0,0 +1,21 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+import { z } from 'zod';
+
+export const zBar = z.object({
+    foo: z.enum(['one', 'two']).optional()
+});
+
+export const zBaz = z.object({
+    foo: z.enum(['three']).optional()
+});
+
+export const zSpæcial = z.object({
+    foo: z.enum(['four']).optional()
+});
+
+export const zFoo = z.discriminatedUnion('foo', [
+    zBar.extend({ foo: z.enum(['one', 'two']) }),
+    zBaz.extend({ foo: z.literal('three') }),
+    zSpæcial.extend({ foo: z.literal('four') })
+]);

packages/openapi-ts-tests/zod/v3/__snapshots__/3.0.x/v4/discriminator-mapped-many-number/zod.gen.ts

@@ -0,0 +1,16 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+import * as z from 'zod/v4';
+
+export const zBar = z.object({
+    code: z.union([z.literal(1), z.literal(2)]).optional()
+});
+
+export const zBaz = z.object({
+    code: z.literal(3).optional()
+});
+
+export const zFoo = z.discriminatedUnion('code', [
+    zBar.extend({ code: z.union([z.literal(1), z.literal(2)]) }),
+    zBaz.extend({ code: z.literal(3) })
+]);

packages/openapi-ts-tests/zod/v3/__snapshots__/3.0.x/v4/discriminator-mapped-many/zod.gen.ts

@@ -0,0 +1,21 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+import * as z from 'zod/v4';
+
+export const zBar = z.object({
+    foo: z.enum(['one', 'two']).optional()
+});
+
+export const zBaz = z.object({
+    foo: z.enum(['three']).optional()
+});
+
+export const zSpæcial = z.object({
+    foo: z.enum(['four']).optional()
+});
+
+export const zFoo = z.discriminatedUnion('foo', [
+    zBar.extend({ foo: z.enum(['one', 'two']) }),
+    zBaz.extend({ foo: z.literal('three') }),
+    zSpæcial.extend({ foo: z.literal('four') })
+]);

packages/openapi-ts-tests/zod/v3/__snapshots__/3.1.x/mini/discriminator-mapped-many-number/zod.gen.ts

@@ -0,0 +1,16 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+import * as z from 'zod/v4-mini';
+
+export const zBar = z.object({
+    code: z.optional(z.union([z.literal(1), z.literal(2)]))
+});
+
+export const zBaz = z.object({
+    code: z.optional(z.literal(3))
+});
+
+export const zFoo = z.discriminatedUnion('code', [
+    z.extend(zBar, { code: z.union([z.literal(1), z.literal(2)]) }),
+    z.extend(zBaz, { code: z.literal(3) })
+]);

packages/openapi-ts-tests/zod/v3/__snapshots__/3.1.x/mini/discriminator-mapped-many/zod.gen.ts

@@ -0,0 +1,21 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+import * as z from 'zod/v4-mini';
+
+export const zBar = z.object({
+    foo: z.optional(z.enum(['one', 'two']))
+});
+
+export const zBaz = z.object({
+    foo: z.optional(z.enum(['three']))
+});
+
+export const zSpæcial = z.object({
+    foo: z.optional(z.enum(['four']))
+});
+
+export const zFoo = z.discriminatedUnion('foo', [
+    z.extend(zBar, { foo: z.enum(['one', 'two']) }),
+    z.extend(zBaz, { foo: z.literal('three') }),
+    z.extend(zSpæcial, { foo: z.literal('four') })
+]);

packages/openapi-ts-tests/zod/v3/__snapshots__/3.1.x/v3/discriminator-mapped-many-number/zod.gen.ts

@@ -0,0 +1,17 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+import { z } from 'zod';
+
+export const zBar = z.object({
+    code: z.union([z.literal(1), z.literal(2)]).optional()
+});
+
+export const zBaz = z.object({
+    code: z.literal(3).optional()
+});
+
+export const zFoo = z.discriminatedUnion('code', [
+    zBar.extend({ code: z.literal(1) }),
+    zBar.extend({ code: z.literal(2) }),
+    zBaz.extend({ code: z.literal(3) })
+]);

packages/openapi-ts-tests/zod/v3/__snapshots__/3.1.x/v3/discriminator-mapped-many/zod.gen.ts

@@ -0,0 +1,21 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+import { z } from 'zod';
+
+export const zBar = z.object({
+    foo: z.enum(['one', 'two']).optional()
+});
+
+export const zBaz = z.object({
+    foo: z.enum(['three']).optional()
+});
+
+export const zSpæcial = z.object({
+    foo: z.enum(['four']).optional()
+});
+
+export const zFoo = z.discriminatedUnion('foo', [
+    zBar.extend({ foo: z.enum(['one', 'two']) }),
+    zBaz.extend({ foo: z.literal('three') }),
+    zSpæcial.extend({ foo: z.literal('four') })
+]);

packages/openapi-ts-tests/zod/v3/__snapshots__/3.1.x/v4/discriminator-mapped-many-number/zod.gen.ts

@@ -0,0 +1,16 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+import * as z from 'zod/v4';
+
+export const zBar = z.object({
+    code: z.union([z.literal(1), z.literal(2)]).optional()
+});
+
+export const zBaz = z.object({
+    code: z.literal(3).optional()
+});
+
+export const zFoo = z.discriminatedUnion('code', [
+    zBar.extend({ code: z.union([z.literal(1), z.literal(2)]) }),
+    zBaz.extend({ code: z.literal(3) })
+]);

packages/openapi-ts-tests/zod/v3/__snapshots__/3.1.x/v4/discriminator-mapped-many/zod.gen.ts

@@ -0,0 +1,21 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+import * as z from 'zod/v4';
+
+export const zBar = z.object({
+    foo: z.enum(['one', 'two']).optional()
+});
+
+export const zBaz = z.object({
+    foo: z.enum(['three']).optional()
+});
+
+export const zSpæcial = z.object({
+    foo: z.enum(['four']).optional()
+});
+
+export const zFoo = z.discriminatedUnion('foo', [
+    zBar.extend({ foo: z.enum(['one', 'two']) }),
+    zBaz.extend({ foo: z.literal('three') }),
+    zSpæcial.extend({ foo: z.literal('four') })
+]);

packages/openapi-ts-tests/zod/v3/test/3.0.x.test.ts

@@ -34,6 +34,22 @@ for (const zodVersion of zodVersions) {
         }),
         description: 'generates circular schemas',
       },
+      {
+        config: createConfig({
+          input: 'discriminator-mapped-many.yaml',
+          output: 'discriminator-mapped-many',
+        }),
+        description:
+          'generates discriminated union when multiple mapping values point to same schema',
+      },
+      {
+        config: createConfig({
+          input: 'discriminator-mapped-many-number.yaml',
+          output: 'discriminator-mapped-many-number',
+        }),
+        description:
+          'generates discriminated union when multiple number mapping values point to same schema',
+      },
       {
         config: createConfig({
           input: 'enum-null.json',

packages/openapi-ts-tests/zod/v3/test/3.1.x.test.ts

@@ -152,6 +152,22 @@ for (const zodVersion of zodVersions) {
         }),
         description: 'handles oneOf discriminator (falls back to z.union when needed)',
       },
+      {
+        config: createConfig({
+          input: 'discriminator-mapped-many.yaml',
+          output: 'discriminator-mapped-many',
+        }),
+        description:
+          'generates discriminated union when multiple mapping values point to same schema',
+      },
+      {
+        config: createConfig({
+          input: 'discriminator-mapped-many-number.yaml',
+          output: 'discriminator-mapped-many-number',
+        }),
+        description:
+          'generates discriminated union when multiple number mapping values point to same schema',
+      },
       {
         config: createConfig({
           input: 'enum-null.json',

packages/openapi-ts-tests/zod/v4/__snapshots__/3.0.x/mini/discriminator-mapped-many-number/zod.gen.ts

@@ -0,0 +1,16 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+import * as z from 'zod/mini';
+
+export const zBar = z.object({
+    code: z.optional(z.union([z.literal(1), z.literal(2)]))
+});
+
+export const zBaz = z.object({
+    code: z.optional(z.literal(3))
+});
+
+export const zFoo = z.discriminatedUnion('code', [
+    z.extend(zBar, { code: z.union([z.literal(1), z.literal(2)]) }),
+    z.extend(zBaz, { code: z.literal(3) })
+]);

packages/openapi-ts-tests/zod/v4/__snapshots__/3.0.x/mini/discriminator-mapped-many/zod.gen.ts

@@ -0,0 +1,21 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+import * as z from 'zod/mini';
+
+export const zBar = z.object({
+    foo: z.optional(z.enum(['one', 'two']))
+});
+
+export const zBaz = z.object({
+    foo: z.optional(z.enum(['three']))
+});
+
+export const zSpæcial = z.object({
+    foo: z.optional(z.enum(['four']))
+});
+
+export const zFoo = z.discriminatedUnion('foo', [
+    z.extend(zBar, { foo: z.enum(['one', 'two']) }),
+    z.extend(zBaz, { foo: z.literal('three') }),
+    z.extend(zSpæcial, { foo: z.literal('four') })
+]);

packages/openapi-ts-tests/zod/v4/__snapshots__/3.0.x/v3/discriminator-mapped-many-number/zod.gen.ts

@@ -0,0 +1,17 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+import { z } from 'zod/v3';
+
+export const zBar = z.object({
+    code: z.union([z.literal(1), z.literal(2)]).optional()
+});
+
+export const zBaz = z.object({
+    code: z.literal(3).optional()
+});
+
+export const zFoo = z.discriminatedUnion('code', [
+    zBar.extend({ code: z.literal(1) }),
+    zBar.extend({ code: z.literal(2) }),
+    zBaz.extend({ code: z.literal(3) })
+]);

packages/openapi-ts-tests/zod/v4/__snapshots__/3.0.x/v3/discriminator-mapped-many/zod.gen.ts

@@ -0,0 +1,21 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+import { z } from 'zod/v3';
+
+export const zBar = z.object({
+    foo: z.enum(['one', 'two']).optional()
+});
+
+export const zBaz = z.object({
+    foo: z.enum(['three']).optional()
+});
+
+export const zSpæcial = z.object({
+    foo: z.enum(['four']).optional()
+});
+
+export const zFoo = z.discriminatedUnion('foo', [
+    zBar.extend({ foo: z.enum(['one', 'two']) }),
+    zBaz.extend({ foo: z.literal('three') }),
+    zSpæcial.extend({ foo: z.literal('four') })
+]);

packages/openapi-ts-tests/zod/v4/__snapshots__/3.0.x/v4/discriminator-mapped-many-number/zod.gen.ts

@@ -0,0 +1,16 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+import * as z from 'zod';
+
+export const zBar = z.object({
+    code: z.union([z.literal(1), z.literal(2)]).optional()
+});
+
+export const zBaz = z.object({
+    code: z.literal(3).optional()
+});
+
+export const zFoo = z.discriminatedUnion('code', [
+    zBar.extend({ code: z.union([z.literal(1), z.literal(2)]) }),
+    zBaz.extend({ code: z.literal(3) })
+]);