lint

Cadence-lint

The linter for Cadence. Find programming errors, bugs, stylistic errors and suspicious constructs.

How to Build

go build ./cmd/lint

Analyzing contracts of an account

To analyze all contracts of an account, specify the network and address. This requires you have the Flow CLI installed and configured (run flow init).

For example:

./lint -network mainnet -address 0x1654653399040a61

Analyzing a transaction

To analyze a transaction, specify the network and transaction ID. This requires you have the Flow CLI installed and configured (run flow init).

For example:

./lint -network mainnet -transaction 44fd8475eeded90d74e7594b10cf456b0866c78221e7f230fcfd4ba1155c542f

Only running some analyzers

By default, all available analyzers are run.

To list all available analyzers, run:

./lint -help

For example, to only run the reference-to-optional and the external-mutation analyzers, run:

./lint -network mainnet -address 0x1654653399040a61 \
    -analyze reference-to-optional \
    -analyze external-mutation

Analyzing contracts in a directory

To analyze all contracts in a directory, specify the path.

For example:

./lint -directory contracts

The files must be named with the .cdc extension and by their location ID of the program:

• Contracts in accounts have the format A.<address>.<name>, e.g. A.e467b9dd11fa00df.FlowStorageFees, where
  • address: Address in hex format, e.g. e467b9dd11fa00df
  • name: The name of the contract, e.g FlowStorageFees
• Transactions have the format t.<ID>, where
  • id: The ID of the transaction (its hash)
• Scripts have the format s.<ID>, where
  • id: The ID of the script (its hash)

Analyzing contracts in a CSV file

To analyze all contracts in a CSV file, specify the path to the file.

For example:

./lint -csv contracts.csv

The CSV file must be in the following format:

• Header: location,code
• Columns:
  • location: The location ID of the program
    • Contracts in accounts have the format A.<address>.<name>, e.g. A.e467b9dd11fa00df.FlowStorageFees, where
      • address: Address in hex format, e.g. e467b9dd11fa00df
      • name: The name of the contract, e.g FlowStorageFees
    • Transactions have the format t.<ID>, where
      • id: The ID of the transaction (its hash)
    • Scripts have the format s.<ID>, where
      • id: The ID of the script (its hash)
  • code: The code of the contract, e.g. pub contract Test {}

Full example:

location,code
t.0000000000000000,"
import 0x1

transaction {
    prepare(signer: AuthAccount) {
        Test.hello()
    }
}
"
A.0000000000000001.Test,"
pub contract Test {

    pub fun hello() {
      log(""Hello, world!"")
    }
}
"