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# Release Note

## New Features
- Improve type inference in `Contract` module when using typescript.
    - The `Contract` now infers method signatures based on the provided ABI.
    - To enable accurate inference, the ABI should be defined using the `as const` assertion or passed directly into tronWeb.contract().
    - The contract instance created using `tronWeb.contract().new()`, or `tronWeb.contract().at()` will not have type inference by default. To enable type inference, you need to cast it using `as ContractInstance<typeof abi>`.
    - After enabling type inference, if a contract method argument is an array, you must either pass the array directly to the method or use as const to narrow the argument type.
    - The `send()` method accepts a `SendOptions` object as its sole parameter. To ensure the correct return type is inferred, pass the object directly to the method or use `as const` to narrow the argument type.

## Change
- Change the return behavior of the `contract.new()` method.
    - Previously, this method mutated the current instance and used the ABI stored on the Tron blockchain, which proved to be unreliable. It now returns a new instance that uses the ABI provided in the options parameter.
- Change props type of `CallOptions` and `SendOptions`.
    - `CallOptions` deleted `callTokenValue`/`callTokenId`/`userFeePercentage` and shouldPollResponse, added `tokenValue` and `tokenId`.
    - `SendOptions` deleted `rawParameter` and `userFeePercentage`, added `tokenValue` and `tokenId`.
- Export `GetEventResultOptions` and `EventResponse`.
- Allow using length as the value of the name field in the ABI, but you cannot use `result['length']` to read its value.
- Bump `axios` from 1.8.3 to 1.11.0, bump `eslint` from 9.22.0 to 9.31.0.

## Bug Fixes
- Fix the issue where `addUpdateData` treats numeric strings as numbers.[#629](https://github.com/tronprotocol/tronweb/issues/629)
    - Starting from TronWeb v6.0.4, `addUpdateData` will use `TronWeb.fromUtf8` to convert the provided data string—unless it starts with '0x'.
    - If the resulting data string has an odd length, a '0' will be prepended to ensure even length.