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# slotseek
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slotseek is a javascript library that assists with finding the storage slots for the `balanceOf` and `allowance` mappings in an ERC20 token contract. It also provides a way to generate mock data that can be used to override the state of a contract in an `eth_call` or `eth_estimateGas` call.
The main use case for this library is to estimate gas costs of transactions that would fail if the address did not have the required balance or approval.