The Configuration File¶

You can modify Brownie’s default behaviours by creating an optional configuration file.

The configuration file must be saved as brownie-config.yaml. If saved in the root directory of a project it will be loaded whenever that project is active. If saved in your home path, it will always be loaded.

All configuration fields are optional. You can copy from the examples below and modify the settings as required.

Configuration values can also be set using environment variables, as well as by specifying the dotenv top-level key.

Default Configuration¶

The following example shows all configuration settings and their default values:

project_structure:
    build: build
    contracts: contracts
    interfaces: interfaces
    reports: reports
    scripts: scripts
    tests: tests

networks:
    default: development
    development:
        gas_limit: max
        gas_buffer: 1
        gas_price: 0
        max_fee: null
        priority_fee: null
        reverting_tx_gas_limit: max
        default_contract_owner: true
        cmd_settings: null
    live:
        gas_limit: auto
        gas_buffer: 1.1
        gas_price: auto
        max_fee: null
        priority_fee: null
        reverting_tx_gas_limit: false
        default_contract_owner: false

compiler:
    evm_version: null
    solc:
        version: null
        optimizer:
            enabled: true
            runs: 200
        remappings: null
    vyper:
        version: null

console:
    show_colors: true
    color_style: monokai
    auto_suggest: true
    completions: true
    editing_mode: emacs

reports:
    exclude_paths: null
    exclude_contracts: null
    only_include_project: true

hypothesis:
    deadline: null
    max_examples: 50
    report_multiple_bugs: False
    stateful_step_count: 10
    phases:
        explicit: true
        reuse: true
        generate: true
        target: true
        shrink: true

autofetch_sources: false
dependencies: null
dev_deployment_artifacts: false

Variable Expansion¶

Brownie supports POSIX-style variable expansion for environment variables.

networks:
    default: ${DEFAULT_NETWORK}

You can also provide defaults.

networks:
    default: ${DEFAULT_NETWORK:-mainnet}

Settings¶

Project Structure¶

Project subdirectory names. Include these fields if you wish to modify the default structure of your project.

project_structure.build¶

Project subdirectory that stores data such as compiler artifacts and unit test results.

default value: build

project_structure.contracts¶

Project subdirectory that stores contract source files.

default value: contracts

project_structure.interfaces¶

Project subdirectory that stores interface source files and ABIs.

default value: interfaces

project_structure.reports¶

Project subdirectory that stores JSON report files.

default value: reports

project_structure.scripts¶

Project subdirectory that stores scripts for deployment and interaction.

default value: scripts

project_structure.tests¶

Project subdirectory that stores unit tests.

default value: tests

Networks¶

default¶

The default network that Brownie connects. If a different network is required, you can override this setting with the --network flag in the command line.

default value: development

networks.development¶

This setting is only available for development networks.

cmd_settings¶

Additional commandline parameters, which are passed into Ganache as commandline arguments. These settings will update the network specific settings defined in network management whenever the project with this configuration file is active.

The following example shows all commandline settings with their default value. fork, disable_cache and unlock have no default values. network_id and time will default to the current timestamp or time respectively. See adding a development network for more details on the arguments.

networks:
    development:
        gas_limit: max
        gas_buffer: 1
        gas_price: 0
        max_fee: null
        priority_fee: null
        reverting_tx_gas_limit: max
        default_contract_owner: true
        cmd_settings:
            port: 8545
            gas_limit: 6721975
            accounts: 10
            chain_id: 1337
            network_id: 1588949648
            evm_version: istanbul
            fork: null
            disable_cache: null
            mnemonic: brownie
            block_time: 0
            default_balance: 100
            time: 2020-05-08T14:54:08+0000
            unlock: null

networks.live¶

Default settings for development and live environments.

gas_limit¶

The default gas limit for all transactions. If set to auto the gas limit is determined using web3.eth.estimate_gas. If set to max, the block gas limit is used.

development default: max

live default: auto

gas_buffer¶

A modifier applied to web3.eth.estimate_gas when determining gas price automatically.

development default: 1

live default: 1.1

gas_price¶

The default gas price for all transactions. If set to auto the gas price is determined using web3.eth.gas_price.

development default: 0

live default: auto

max_fee¶

The default max fee per gas for all transactions. If set to null, transactions will default to legacy-style (using gas_price).

default: null

priority_fee¶

The default max priority fee per gas for all transactions. If set to null, transactions will default to legacy-style (using gas_price).

default: null

default_contract_owner¶: If false, deployed contracts will not remember the account that they were created by. Every transaction will require a from kwarg.

reverting_tx_gas_limit¶

The gas limit to use when a transaction would revert. If set to false, transactions that would revert will instead raise a VirtualMachineError.

development default: max

live default: false

Compiler¶

Compiler settings. See compiler settings for more information.

evm_version¶

The EVM version to compile for. If null the most recent one is used. Possible values are byzantium, constantinople, petersburg, istanbul, atlantis and agharta.

default value: null

compiler.solc¶

Settings specific to the Solidity compiler.

version¶

The version of solc to use. Should be given as a string in the format 0.x.x. If set to null, the version is set based on the contract pragma. Brownie supports solc versions >=0.4.22.

default value: null

viaIR¶

Enable solc compilation pipeline to go through the Yul Intermediate Representation to generate IR-based EVM bytecode. See the Solidity documentation for breaking changes.

default value: false

optimizer¶: Optimizer settings to be passed to the Solidity compiler. Values given here are passed into the compiler with no reformatting. See the Solidity documentation for a list of possible values.

remappings¶

Optional field used to supply path remappings.

remappings:
  - zeppelin=/usr/local/lib/open-zeppelin/contracts/
  - github.com/ethereum/dapp-bin/=/usr/local/lib/dapp-bin/

use_latest_patch¶

Optional boolean or array contract list to use the latest patch semver compiler version. E.g. the if the contract has pragma version 0.4.16 and the latest available patch for 0.4 is 0.4.22 it will use this instead for compilations.

Enable for all contracts: .. code-block:: yaml

compiler:

solc:

use_latest_patch: true

Enable for only specific contracts: .. code-block:: yaml

compiler:

solc:

use_latest_patch:

‘0x514910771AF9Ca656af840dff83E8264EcF986CA’

compiler.vyper¶

Settings specific to the Vyper compiler.

version

The version of vyper to use. Should be given as a string in the format 0.x.x. If set to null, the version is set based on the contract pragma. Brownie supports vyper versions >=0.1.0-beta.16.

default value: null

Console¶

show_colors¶

Enable or disable colorful output.

default value: true

color_style¶

Set the Pygments color style used within the console and throughout Brownie.

You can view a gallery of popular styles here.

default value: monokai

auto_suggest¶

Enable or disable type hints for contract function inputs.

default value: true

completions¶

Enable or disable autocompletion.

default value: true

editing_mode¶

Choose between emacs and vi console editing modes.

default value: emacs

Reports¶

Settings related to reports such as coverage data and gas profiles.

exclude_paths¶

Paths or glob patterns of source files to be excluded from report data.

default value: null

reports:
    exclude_paths:
        - contracts/mocks/**/*.*
        - contracts/SafeMath.sol

exclude_contracts¶

Contract names to be excluded from report data.

default value: null

reports:
    exclude_contracts:
        - SafeMath
        - Owned

only_include_project¶

If false, reports also include contracts imported from outside the active project (such as those compiled via compile_source).

default value: true

Hypothesis¶

Default settings for property-based and stateful test execution. See the Hypothesis settings documentation for a complete list of available settings.

hypothesis:
    deadline: null
    max_examples: 50
    report_multiple_bugs: False
    stateful_step_count: 10
    deadline: null
    phases:
        explicit: true
        reuse: true
        generate: true
        target: true
        shrink: true

Other Settings¶

autofetch_sources¶

If enabled, Brownie will always attempt to fetch source code for unknown addresses using Contract.from_explorer.

default value: false

dependencies¶

A list of packages that a project depends on. Brownie will attempt to install all listed dependencies prior to compiling the project.

dependencies:
    - aragon/aragonOS@4.0.0
    - defi.snakecharmers.eth/compound@1.1.0

See the Brownie Package Manager to learn more about package dependencies.

dev_deployment_artifacts¶

If enabled, Brownie will save deployment artifacts for contracts deployed on development networks and will include the “dev” network on the deployment map.

This is useful if another application, such as a front end framework, needs access to deployment artifacts while you are on a development network.

default value: false

dotenv¶

If present, Brownie will load the .env file, resolving the file relative to the project root. Will fail loudly if .env file is missing.

dotenv: .env