Changed import of AWS - reduce code size

[sean9keenan]

Pulled out the S3 dependency, and imported AWS directly from aws-sdk/global.

This makes it possible for webpack to minimize the AWS SDK as the other dependencies don't even enter the picture.

The net impact for me was reducing the javascript file that is downloaded from 1.9MB to 788KB, which was a pretty big win in my book! (Specifically the aws-sdk is now 216KB vs 1.3MB)

Although I'll be honest - it took me longer than I care to admit to find this particular incantation to reduce the bundle size... 😄

For future people that might read this:

• Using their minimized SDK was a dead-end, as it would require altering the webpack file from the CreateReactApp, which is possible - but makes it harder to get upstream changes since you'd have to eject
• Attempting to import pieces piece-wise as named exports a la import { Config, CognitoIdentityCredentials } from 'aws-sdk'. Completely works - you just have to pass the Config manually into the second arg of CognitoIdentityCredentials, as well as change the region on the config directly as a property, but alas this doesn't let Webpack minimize the sdk properly.

[jayair]

@sean9keenan Nice work! This is something we should add to the tutorial. Did you find any documentation for this on AWS' side? We'd want to link to that in the tutorial as well.

[sean9keenan]

Yup!
This link is the best - but it doesn't talk about the global import

This is the original git issue

And this is the tutorial where I found the pointer for the global import - which also has a part one

[jayair]

@sean9keenan Great! Thanks. I'll take a look and figure out how to integrate it with the tutorial.

[quantuminformation]

thx @sean9keenan

[jayair]

@sean9keenan I added a section in the Deploy chapter on your PR and linked to it as well - https://serverless-stack.com/chapters/deploy-to-s3.html#app-bundle-size

Thanks again.