tsconfig.json

{
  "compilerOptions": {
    // https://www.npmjs.com/package/ts-polyfill
    // assume these libs will be present https://basarat.gitbooks.io/typescript/docs/types/lib.d.ts.html#lib-option
    "lib": [
        "dom",
        "dom.iterable",
        "es2015",
        "es2016.array.include",
        "es2017.object",
        "es2017.string"
    ],
    "jsx": "react",
    "outDir": "./tsc/", // .gitignored directory for when `tsc` is run so .js files are not written out next to source files
    "resolveJsonModule": true, // resolve and type json files!
    "strict": true, // use typescript's strict type-checking
    "target": "es5", // target older es5 browsers
    "esModuleInterop": true // support lodash imports in parcel.js 
  },
  "include": [
    "./src/**/**/*"
  ],
  "plugins": [
    {
      "name": "typescript-tslint-plugin",
      "alwaysShowRuleFailuresAsWarnings": false,
      "ignoreDefinitionFiles": true,
      "configFile": "./tslint.json",
      "suppressWhileTypeErrorsPresent": false,
      "mockTypeScriptVersion": false
    }
  ]
}