tsconfig.json

{
  "compilerOptions": {
    "target": "es2015", /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
    "module": "commonjs", /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
    "allowJs": true,
    "lib": [
      "es6",
    ], /* Specify library files to be included in the compilation. */
    "sourceMap": true,                     /* Generates corresponding '.map' file. */
    "outDir": "lib", /* Redirect output structure to the directory. */
    "rootDirs": ["src", "solidity-parser-antlr", "surya"],
    "strict": true, /* Enable all strict type-checking options. */
    "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
    "esModuleInterop": true, /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
    "resolveJsonModule": true /* Include modules imported with '.json' extension */
  },
}