npm start
Which should result in:
$ sls offline start
Serverless: Compiling with Typescript...
Serverless: Using local tsconfig.json
Serverless: Typescript compiled.
Serverless: Watching typescript files...
Serverless: Starting Offline: dev/us-east-1.
Serverless: Routes for main:
Serverless: ANY /{proxy*}
Serverless: Offline listening on http://localhost:3000
Then browse http://localhost:3000/
sls deploy