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Logging
Logger
**new **ethers . utils . Logger( version )
Create a new logger which will include version in all errors thrown.
Logger . globalLogger( ) => Logger
Returns the singleton global logger.
Logging Output
logger . debug( ...args ) => void
Log debugging information.
logger . info( ...args ) => void
Log generic information.
logger . warn( ...args ) => void
Log warnings.
Errors
logger . makeError( message [ , code = UNKNOWN_ERROR [ , params ] ] ) => Error
Create an Error object with message and an optional code and additional params set. This is useful when an error is needed to be rejected instead of thrown.
logger . throwError( message [ , code = UNKNOWN_ERROR [ , params ] ] ) => never
Throw an Error with message and an optional code and additional params set.
logger . throwArgumentError( message , name , value ) => never
Throw an INVALID_ARGUMENT Error with name and value.
Usage Validation
logger . checkAbstract( target , kind ) => void
Checks that target is not kind and performs the same operations as checkNew. This is useful for ensuring abstract classes are not being instantiated.
logger . checkArgumentCount( count , expectedCount [ , message ) => void
If count is not equal to expectedCount, throws a MISSING_ARGUMENT or UNEXPECTED_ARGUMENT error.
logger . checkNew( target , kind ) => void
If target is not a valid this or target value, throw a MISSING_NEW error. This is useful to ensure callers of a Class are using new.
logger . checkNormalize( message ) => void
Check that the environment has a correctly functioning String.normalize. If not, a UNSUPPORTED_OPERATION error is thrown.
logger . checkSafeUint53( value [ , message ] ) => void
If value is not safe as a JavaScript number, throws a NUMERIC_FAULT error.
Censorship
Logger . setCensorship( censor [ , permanent = false ] ) => void
Set error censorship, optionally preventing errors from being uncensored.
In production applications, this prevents any error from leaking information by masking the message and values of errors.
This can impact debugging, making it substantially more difficult.
Logger . setLogLevel( logLevel ) => void
Set the log level, to suppress logging output below a particular log level.
Errors
Generic Error Codes
Logger . errors . NOT_IMPLEMENTED
The operation is not implemented.
Logger . errors . SERVER_ERROR
There was an error communicating with a server.
Logger . errors . TIMEOUT
A timeout occurred.
Logger . errors . UNKNOWN_ERROR
A generic unknown error.
Logger . errors . UNSUPPORTED_OPERATION
The operation is not supported.
Safety Error Codes
Logger . errors . BUFFER_OVERRUN
The amount of data needed is more than the amount of data required, which would cause the data buffer to read past its end.
Logger . errors . NUMERIC_FAULT
There was an invalid operation done on numeric values.
Common cases of this occur when there is overflow, arithmetic underflow in fixed numeric types or division by zero.
Usage Error Codes
Logger . errors . INVALID_ARGUMENT
The type or value of an argument is invalid. This will generally also include the name and value of the argument. Any function which accepts sensitive data (such as a private key) will include the string [[REDACTED]] instead of the value passed in.
Logger . errors . MISSING_ARGUMENT
An expected parameter was not specified.
Logger . errors . MISSING_NEW
An object is a Class, but is now being called with new.
Logger . errors . UNEXPECTED_ARGUMENT
Too many parameters we passed into a function.
Ethereum Error Codes
Logger . errors . CALL_EXCEPTION
An attempt to call a blockchain contract (getter) resulted in a revert or other error.
Logger . errors . INSUFFICIENT_FUNDS
The account is attempting to make a transaction which costs more than is available.
A sending account must have enough ether to pay for the value, the gas limit (at the gas price) as well as the intrinsic cost of data. The intrinsic cost of data is 4 gas for each zero byte and 68 gas for each non-zero byte.
Logger . errors . NETWORK_ERROR
An Ethereum network validation error, such as an invalid chain ID.
Logger . errors . NONCE_EXPIRED
The nonce being specified has already been used in a mined transaction.
Logger . errors . REPLACEMENT_UNDERPRICED
When replacing a transaction, by using a nonce which has already been sent to the network, but which has not been mined yet the new transaction must specify a higher gas price.
This error occurs when the gas price is insufficient to bribe the transaction pool to prefer the new transaction over the old one. Generally, the new gas price should be about 50% + 1 wei more, so if a gas price of 10 gwei was used, the replacement should be 15.000000001 gwei.
Logger . errors . UNPREDICTABLE_GAS_LIMIT
When estimating the required amount of gas for a transaction, a node is queried for its best guess.
If a node is unable (or unwilling) to predict the cost, this error occurs.
The best remedy for this situation is to specify a gas limit in the transaction manually.
This error can also indicate that the transaction is expected to fail regardless, if for example an account with no tokens is attempting to send a token.
Log Levels
Logger . levels . DEBUG
Log all output, including debugging information.
Logger . levels . INFO
Only log output for informational, warnings and errors.
Logger . levels . WARNING
Only log output for warnings and errors.
Logger . levels . ERROR
Only log output for errors.
Logger . levels . OFF
Do not output any logs.