Add ABI JSON generation tool (SDK functions + CLI) from on-chain state

[gregnazario]

Description

Adds SDK functions for generating JSON-serializable ABI definitions from on-chain Move modules, plus a standalone CLI package (@aptos-labs/generate-abi-json) that can be run via npx without writing any code.

This enables users to pre-generate ABI JSON at build time, store it, and use it at runtime without remote ABI fetching overhead.

SDK Functions (library API in @aptos-labs/ts-sdk)

Function	Purpose
generateModuleAbiJSON	Fetch all entry/view function ABIs for a module as JSON
generateEntryFunctionAbiJSON	Fetch a single entry function ABI as JSON
generateViewFunctionAbiJSON	Fetch a single view function ABI as JSON
parseEntryFunctionAbiJSON	Hydrate JSON back into EntryFunctionABI with TypeTag objects
parseViewFunctionAbiJSON	Hydrate JSON back into ViewFunctionABI with TypeTag objects

New types: EntryFunctionAbiJSON, ViewFunctionAbiJSON, ModuleAbiJSON

CLI Package (@aptos-labs/generate-abi-json)

A standalone package at packages/generate-abi-json/ that can be run without writing any code:

# All entry/view ABIs for the coin module on mainnet
npx @aptos-labs/generate-abi-json --address 0x1 --module coin --pretty

# Single function
npx @aptos-labs/generate-abi-json --address 0x1 --module coin --function transfer --pretty

# Write to file
npx @aptos-labs/generate-abi-json --address 0x1 --module coin --output coin-abi.json

# Custom network
npx @aptos-labs/generate-abi-json --network testnet --address 0x1 --module coin
npx @aptos-labs/generate-abi-json --node-url http://localhost:8080/v1 --address 0x1 --module coin

Using the output with the SDK:

import { parseEntryFunctionAbiJSON } from "@aptos-labs/ts-sdk";
import coinAbi from "./coin-abi.json";

const transferAbi = parseEntryFunctionAbiJSON(coinAbi.entryFunctions.transfer);
const txn = await aptos.transaction.build.simple({
  sender: alice.accountAddress,
  data: {
    function: "0x1::coin::transfer",
    typeArguments: ["0x1::aptos_coin::AptosCoin"],
    functionArguments: [bob.accountAddress, 100],
    abi: transferAbi,
  },
});

Test Plan

• Unit tests (tests/unit/abiJson.test.ts): 12 test cases covering parseEntryFunctionAbiJSON and parseViewFunctionAbiJSON with various parameter types, constraints, empty params, and JSON round-trip serialization.
• E2E tests (tests/e2e/api/abiJson.test.ts): 13 test cases against a local Aptos testnet covering generation, error cases, round-trip serialization, and transaction building with parsed ABIs.
• CLI manual testing: Verified all CLI modes (--help, full module, single entry/view function, --output, error cases) against a local testnet from the standalone package.

All 25 automated tests pass.

Related Links

N/A

Checklist

• Have you ran pnpm fmt?
• Have you updated the CHANGELOG.md?