Fix sourcemap error on create-react-app 5

[georgesofianosgr]

Create react app 5 uses "source-map-loader" in webpack which cannot find the source maps and produces a warning.

I added inlineSources in tsconfig.json to fix this problem as proposed in this package here https://github.com/typestack/class-transformer/pull/473

To reproduce:

• Create a create react app project
• Add usePortal and use it. You will see the warnings.

[alex-cory]

Will get this merged and published asap

[mariocsantos]

Waiting for this to be merged! Thank you @georgesofianosgr

[alex-cory]

Merged and published. v1.0.17