fix: normalize AbiFallback.inputs type and zod

.changeset/angry-taxis-enjoy.md

@@ -0,0 +1,5 @@
+---
+"abitype": patch
+---
+
+normalize AbiFallback.inputs type and zod

packages/abitype/src/abi.ts

@@ -163,7 +163,7 @@ export type AbiConstructor = {
 /** ABI ["fallback"](https://docs.soliditylang.org/en/latest/abi-spec.html#json) type */
 export type AbiFallback = {
   type: 'fallback'
-  inputs?: readonly [] | undefined
+  inputs?: readonly never[] | undefined
   /**
    * @deprecated use `payable` or `nonpayable` from {@link AbiStateMutability} instead
    * @see https://github.com/ethereum/solidity/issues/992

packages/abitype/src/zod.test-d.ts

@@ -5,18 +5,23 @@ import type {
   AbiConstructor,
   AbiError,
   AbiEvent,
+  AbiFallback,
+  AbiFunction,
   AbiParameter,
 } from './abi.js'
 import {
   customSolidityErrorsAbi,
   ensRegistryWithFallbackAbi,
   erc20Abi,
+  wethAbi,
 } from './abis/json.js'
 import {
   Abi as AbiSchema,
   AbiConstructor as AbiConstructorSchema,
   AbiError as AbiErrorSchema,
   AbiEvent as AbiEventSchema,
+  AbiFallback as AbiFallbackSchema,
+  AbiFunction as AbiFunctionSchema,
   AbiParameter as AbiParameterSchema,
 } from './zod.js'
 
@@ -87,6 +92,54 @@ describe('Zod Types', () => {
     })
   })
 
+  describe('AbiFunction', () => {
+    const approveFunction = erc20Abi[3]
+
+    test('assignable to AbiFunction', () => {
+      const parsed: AbiFunction = AbiFunctionSchema.parse(approveFunction)
+      type Result = typeof parsed extends AbiFunction ? true : false
+      expectTypeOf<Result>().toEqualTypeOf<true>()
+    })
+
+    test('extends AbiFunction', () => {
+      const parsed = AbiFunctionSchema.parse(approveFunction)
+      type Result = typeof parsed extends AbiFunction ? true : false
+      expectTypeOf<Result>().toEqualTypeOf<true>()
+    })
+  })
+
+  describe('AbiFallback', () => {
+    const approveFunction = wethAbi[11]
+
+    test('assignable to AbiFallback', () => {
+      const parsed: AbiFallback = AbiFallbackSchema.parse(approveFunction)
+      type Result = typeof parsed extends AbiFallback ? true : false
+      expectTypeOf<Result>().toEqualTypeOf<true>()
+    })
+
+    test('extends AbiFallback', () => {
+      const parsed = AbiFallbackSchema.parse(approveFunction)
+      type Result = typeof parsed extends AbiFallback ? true : false
+      expectTypeOf<Result>().toEqualTypeOf<true>()
+    })
+  })
+
+  describe('AbiFunction', () => {
+    const approveFunction = erc20Abi[3]
+
+    test('assignable to AbiFunction', () => {
+      const parsed: AbiFunction = AbiFunctionSchema.parse(approveFunction)
+      type Result = typeof parsed extends AbiFunction ? true : false
+      expectTypeOf<Result>().toEqualTypeOf<true>()
+    })
+
+    test('extends AbiFunction', () => {
+      const parsed = AbiFunctionSchema.parse(approveFunction)
+      type Result = typeof parsed extends AbiFunction ? true : false
+      expectTypeOf<Result>().toEqualTypeOf<true>()
+    })
+  })
+
   describe('AbiParameter', () => {
     const approvalOwnerParameter = erc20Abi[0].inputs[0]
 

packages/abitype/src/zod.ts

@@ -164,7 +164,7 @@ export const AbiFallback = z.preprocess(
      * @deprecated use `pure` or `view` from {@link AbiStateMutability} instead
      * https://github.com/ethereum/solidity/issues/992
      */
-    inputs: z.tuple([]).optional(),
+    inputs: z.tuple([]).readonly().optional(),
     /**
      * @deprecated use `payable` or `nonpayable` from {@link AbiStateMutability} instead
      * https://github.com/ethereum/solidity/issues/992