Icon LinkConfig File

Here, you can learn more about all configuration options.

Icon Linkworkspace

Relative directory path to Forc workspace.

workspace: './sway-programs',

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The property workspace is incompatible with contracts , predicates , and scripts .

Icon Linkcontracts

List of relative directory paths to Sway contracts.

contracts: ['./sway-programs/contracts'],

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The property contracts is incompatible with workspace .

Icon Linkpredicates

List of relative directory paths to Sway predicates.

predicates: ['./sway-programs/predicates'],

Icon InfoCircle

The property predicates is incompatible with workspace .

Icon Linkscripts

List of relative directory paths to Sway scripts.

scripts: ['./sway-programs/scripts'],

Icon InfoCircle

The property scripts is incompatible with workspace .

Icon Linkoutput

Relative directory path to use when generating Typescript definitions.

output: './src/sway-programs-api',

Icon LinkproviderUrl

The URL to use when deploying contracts.

// Default: http://127.0.0.1:4000/v1/graphql
providerUrl: 'http://network:port/v1/graphql',

Icon InfoCircle

When autostartFuelCore property is set to true, the providedUrl is overridden by that of the local short-lived fuel-core node started by the fuels dev command.

Icon LinkprivateKey

Wallet private key, used when deploying contracts.

This property should ideally come from env — process.env.MY_PRIVATE_KEY.

privateKey: '0xa449b1ffee0e2205fa924c6740cc48b3b473aa28587df6dab12abc245d1f5298',

Icon InfoCircle

When autostartFuelCore property is set to true, the privateKey is overridden with the consensusKey of the local short-lived fuel-core node started by the fuels dev command.

Icon LinksnapshotDir

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• Used by fuels dev only.

Relative path to directory containing custom configurations for fuel-core, such as:

• chainConfig.json
• metadata.json
• stateConfig.json

This will take effect only when autoStartFuelCore is true.

snapshotDir: './my/snapshot/dir',

Icon LinkautoStartFuelCore

Icon InfoCircle

• Used by fuels dev only.

When set to true, it will automatically:

1. Starts a short-lived fuel-core node as part of the fuels dev command
2. Override property providerUrl with the URL for the recently started fuel-core node

autoStartFuelCore: true,

If set to false, you must spin up a fuel-core node by yourself and set the URL for it via providerUrl .

Icon LinkfuelCorePort

Icon InfoCircle

• Used by fuels dev only.
• Ignored when autoStartFuelCore is set to false.

Port to use when starting a local fuel-core node.

// Default: first free port, starting from 4000
fuelCorePort: 4000,

Icon LinkforcBuildFlags

Icon InfoCircle

• Used by fuels build and fuels deploy .

Sway programs are compiled in debug mode by default.

Here you can customize all build flags, e.g. to build programs in release mode.

// Default: []
forcBuildFlags: ['--release'],

Check also:

• Forc docs Icon Link

Icon LinkdeployConfig

You can supply a ready-to-go deploy configuration object:

deployConfig: {},

Or use a function for crafting dynamic deployment flows:

• If you need to fetch and use configs or data from a remote data source
• If you need to use IDs from already deployed contracts — in this case, we can use the options.contracts property to get the necessary contract ID. For example:

deployConfig: async (options: ContractDeployOptions) => {
  // ability to fetch data remotely
  await Promise.resolve(`simulating remote data fetch`);
 
  // get contract by name
  const { contracts } = options;
 
  const contract = contracts.find(({ name }) => {
    const found = name === MY_FIRST_DEPLOYED_CONTRACT_NAME;
    return found;
  });
 
  if (!contract) {
    throw new Error('Contract not found!');
  }
 
  return {
    storageSlots: [
      {
        key: '0x..',
        /**
         * Here we could initialize a storage slot,
         * using the relevant contract ID.
         */
        value: contract.contractId,
      },
    ],
  };
},

Icon LinkonBuild

A callback function that is called after a build event has been successful.

Parameters:

• config — The loaded config (fuels.config.ts)

onBuild: (config: FuelsConfig) => {
  console.log('fuels:onBuild', { config });
},

Icon LinkonDeploy

A callback function that is called after a deployment event has been successful.

Parameters:

• config — The loaded config (fuels.config.ts)
• data — The data (an array of deployed contracts)

// #import { DeployedContract, FuelsConfig };
 
onDeploy: (config: FuelsConfig, data: DeployedContract[]) => {
  console.log('fuels:onDeploy', { config, data });
},

Icon LinkonDev

A callback function that is called after the fuels dev command has successfully restarted.

Parameters:

• config — The loaded config (fuels.config.ts)

onDev: (config: FuelsConfig) => {
  console.log('fuels:onDev', { config });
},

Icon LinkonNode

A callback function that is called after the fuels node command has successfully refreshed.

Parameters:

• config — The loaded config (fuels.config.ts)

onNode: (config: FuelsConfig) => {
  console.log('fuels:onNode', { config });
},

Icon LinkonFailure

Pass a callback function to be called in case of errors.

Parameters:

• config — The loaded config (fuels.config.ts)
• error — Original error object

onFailure: (config: FuelsConfig, error: Error) => {
  console.log('fuels:onFailure', { config, error });
},

Icon LinkforcPath

Path to the forc binary.

When not supplied, will default to using the system binaries (forc).

// Default: 'forc',
forcPath: '~/.fuelup/bin/forc',

Icon LinkfuelCorePath

Path to the fuel-core binary.

When not supplied, will default to using the system binaries (fuel-core).

// Default: 'fuel-core'
fuelCorePath: '~/.fuelup/bin/fuel-core',

Icon LinkLoading environment variables

If you want to load environment variables from a .env file, you can use the dotenv package.

First, install it:

pnpm install dotenv

Then, you can use it in your fuels.config.ts file:

import { createConfig } from 'fuels';
import dotenv from 'dotenv';
import { NODE_URL } from '@/lib';
 
dotenv.config({
  path: ['.env.local', '.env'],
});
 
// If your node is running on a port other than 4000, you can set it here
const fuelCorePort = +(process.env.NEXT_PUBLIC_FUEL_NODE_PORT as string) || 4000;
 
export default createConfig({
  workspace: './sway-programs', // Path to your Sway workspace
  output: './src/sway-api', // Where your generated types will be saved
  fuelCorePort,
  providerUrl: NODE_URL,
});