# TokenHelper

[Git Source](https://github.com/traderjoe-xyz/joe-v2/blob/16f011d25e6bf6d0a0c479974345b623d491104f/src/libraries/TokenHelper.sol)

**Author:**\
Trader Joe

Wrappers around ERC20 operations that throw on failure (when the token\
contract returns false). Tokens that return no value (and instead revert or\
throw on failure) are also supported, non-reverting calls are assumed to be\
successful.\
To use this library you can add a `using TokenHelper for IERC20;` statement to your contract,\
which allows you to call the safe operation as `token.safeTransfer(...)`

## Functions

### safeTransferFrom

Transfers token and reverts if the transfer fails

```solidity
function safeTransferFrom(IERC20 token, address owner, address recipient, uint256 amount) internal;
```

**Parameters**

| Name        | Type      | Description                  |
| ----------- | --------- | ---------------------------- |
| `token`     | `IERC20`  | The address of the token     |
| `owner`     | `address` | The owner of the tokens      |
| `recipient` | `address` | The address of the recipient |
| `amount`    | `uint256` | The amount to send           |

### safeTransfer

Transfers token and reverts if the transfer fails

```solidity
function safeTransfer(IERC20 token, address recipient, uint256 amount) internal;
```

**Parameters**

| Name        | Type      | Description                  |
| ----------- | --------- | ---------------------------- |
| `token`     | `IERC20`  | The address of the token     |
| `recipient` | `address` | The address of the recipient |
| `amount`    | `uint256` | The amount to send           |

### \_callAndCatch

```solidity
function _callAndCatch(IERC20 token, bytes memory data) internal;
```

## Errors

### TokenHelper\_\_TransferFailed

```solidity
error TokenHelper__TransferFailed();
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://developers.lfj.gg/contracts/libraries/tokenhelper.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.