Breaks if rootDir not set in tsconfig.json

[breathe]

Serverless: Compiling with Typescript...
Serverless: Using local tsconfig.json

  Type Error ---------------------------------------------

  Path must be a string. Received undefined

     For debugging logs, run again after setting the "SLS_DEBUG=*" environment variable.

  Stack Trace --------------------------------------------

TypeError: Path must be a string. Received undefined
    at assertPath (path.js:7:11)
    at Object.resolve (path.js:1146:7)
    at Object.getTypescriptConfig (./node_modules/serverless-plugin-typescript/src/typescript.ts:96:14)
    at ServerlessPlugin.<anonymous> (./node_modules/serverless-plugin-typescript/src/index.ts:122:33)
    at Generator.next (<anonymous>)
    at ./node_modules/serverless-plugin-typescript/dist/src/index.js:7:71
    at __awaiter (./node_modules/serverless-plugin-typescript/dist/src/index.js:3:12)
    at ServerlessPlugin.compileTs (./node_modules/serverless-plugin-typescript/dist/src/index.js:99:16)
    at BbPromise.reduce (/usr/local/lib/node_modules/serverless/lib/classes/PluginManager.js:218:55)
From previous event:
    at PluginManager.invoke (/usr/local/lib/node_modules/serverless/lib/classes/PluginManager.js:218:22)
    at PluginManager.spawn (/usr/local/lib/node_modules/serverless/lib/classes/PluginManager.js:230:17)
    at Deploy.BbPromise.bind.then.then (/usr/local/lib/node_modules/serverless/lib/plugins/deploy/deploy.js:101:50)
From previous event:
    at Object.before:deploy:deploy [as hook] (/usr/local/lib/node_modules/serverless/lib/plugins/deploy/deploy.js:99:10)
    at BbPromise.reduce (/usr/local/lib/node_modules/serverless/lib/classes/PluginManager.js:218:55)
From previous event:
    at PluginManager.invoke (/usr/local/lib/node_modules/serverless/lib/classes/PluginManager.js:218:22)
    at PluginManager.run (/usr/local/lib/node_modules/serverless/lib/classes/PluginManager.js:237:17)
    at variables.populateService.then (/usr/local/lib/node_modules/serverless/lib/Serverless.js:99:33)
    at runCallback (timers.js:672:20)
    at tryOnImmediate (timers.js:645:5)
    at processImmediate [as _immediateCallback] (timers.js:617:5)
From previous event:
    at Serverless.run (/usr/local/lib/node_modules/serverless/lib/Serverless.js:86:74)
    at serverless.init.then (/usr/local/lib/node_modules/serverless/bin/serverless:39:50)

Here's the problematic code I believe:

    // disallow overrriding rootDir
    if (path.resolve(configParseResult.options.rootDir) !== path.resolve(cwd) && logger) {
      logger.log('Warning: "rootDir" from local tsconfig.json is overriden')