{
  "compilerOptions": {
    "target": "es6",
    "module": "commonjs",
    "moduleResolution": "node",
    "declaration": true,
    "noImplicitAny": false,
    "rootDir": "src",
    "outDir": "lib",
    "allowSyntheticDefaultImports": true,
    "removeComments": true,
    "importHelpers": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true
  },
  "include": [
    "src/**/*"
  ],
  "exclude": [
    "src/__test_utils.ts",
    "src/**/__mocks__/*",
    "src/**/__tests__/*"
  ]
}

{
  "compilerOptions": {
    "target": "es5",
    "lib": [
      "dom",
      "es2015"
    ],
    "module": "commonjs",
    "moduleResolution": "node",
    "declaration": true,
    "noImplicitAny": false,
    "rootDir": "src",
    "outDir": "lib",
    "allowSyntheticDefaultImports": true,
    "removeComments": true,
    "importHelpers": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true
  },
  "include": [
    "src/**/*"
  ],
  "exclude": [
    "src/__test_utils.ts",
    "src/**/__mocks__/*",
    "src/**/__tests__/*"
  ]
}

Change typescript build target to ES5
Change typescript build target to ES5
