tsconfig.json

{
    "compilerOptions": {
        "module": "commonjs",
        "target": "es6",
        "lib": ["es2017", "dom", "esnext.asynciterable", "es2018.promise"],
        "experimentalDecorators": true,
        "downlevelIteration": true,
        "noImplicitReturns": true,
        "pretty": true,
        "skipLibCheck": true,
        "typeRoots": ["node_modules/@0x/typescript-typings/types", "node_modules/@types"],
        "strict": true,
        // These settings are required for TypeScript project references
        "declaration": true,
        "declarationMap": true,
        "sourceMap": true,
        "useUnknownInCatchVariables": false
    },
    "exclude": [],
    // The root of the project is just a list of references and does not contain
    // any top-level TypeScript code.
    "include": [],
    "references": [
        { "path": "./contracts/test-utils" },
        { "path": "./contracts/utils" },
        { "path": "./packages/contract-addresses" },
        { "path": "./packages/contract-artifacts" },
        { "path": "./packages/contract-wrappers" }
    ]
}