remix-project/libs/remix-tests/tsconfig.json

{
  "extends": "../../tsconfig.json",
  "include": ["src"],
  "compilerOptions": {
    "target": "es5",                          /* 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'. */
    "lib": ["dom", "es2018"],                 /* Specify library files to be included in the compilation. */
    "types": ["node"],
    "declaration": true,                      /* Generates corresponding '.d.ts' file. */
    "sourceMap": true,                        /* Generates corresponding '.map' file. */
    /* Strict Type-Checking Options */
    "strict": true,                           /* Enable all strict type-checking options. */
    "noImplicitAny": false,
    "typeRoots": [
      "./@types",
      "./node_modules/@types"
    ] 
  }
}