feat: support nullish

Author: MH4GF

src/valibot/index.ts

@@ -73,6 +73,8 @@ function generateFieldTypeValibotSchema(config: ValidationSchemaPluginConfig, vi
 
     if (isNonNullType(parentType))
       return gen;
+
+    return `v.nullish(${gen})`;
   }
   console.warn('unhandled type:', type);
   return '';

tests/valibot.spec.ts

@@ -31,4 +31,34 @@ describe('valibot', () => {
       "
     `);
   })
+  it('nullish', async () => {
+    const schema = buildSchema(/* GraphQL */ `
+      input PrimitiveInput {
+        a: ID
+        b: String
+        c: Boolean
+        d: Int
+        e: Float
+        z: String! # no defined check
+      }
+    `);
+    const scalars = {
+      ID: 'string',
+    }
+    const result = await plugin(schema, [], { schema: 'valibot', scalars }, {});
+    expect(result.content).toMatchInlineSnapshot(`
+      "
+      export function PrimitiveInputSchema(): v.GenericSchema<PrimitiveInput> {
+        return v.object({
+          a: v.nullish(v.string()),
+          b: v.nullish(v.string()),
+          c: v.nullish(v.boolean()),
+          d: v.nullish(v.number()),
+          e: v.nullish(v.number()),
+          z: v.string()
+        })
+      }
+      "
+    `);
+  })
 })