I worked on Netlify Dev, which does offer a simulated lambda environment for testing locally: https://news.ycombinator.com/item?id=19615546
I was also quite disappointed to see that AWS Amplify did not offer a running dev server for lambdas, best you could do was a local onetime manual invoke and even that often failed (mismatched to the live lambda environment where it succeeds)
I worked on Netlify Dev, which does offer a simulated lambda environment for testing locally: https://news.ycombinator.com/item?id=19615546
I was also quite disappointed to see that AWS Amplify did not offer a running dev server for lambdas, best you could do was a local onetime manual invoke and even that often failed (mismatched to the live lambda environment where it succeeds)