Add documentation detailing differences between CRA 2.0 and CRA-TS about create-react-app-typescript HOT 10 OPEN

@dkozickis After doing some reading, it would seem that one of the other implications is that Babel 7 doesn't actually do any type-checking of Typescript code, it just transpiles it down to Javascript. If you want type-checking, you still have to run tsc.

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@hassankhan https://blogs.msdn.microsoft.com/typescript/2018/08/27/typescript-and-babel-7/

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I believe the correct CRA version is 2.1. Also one more difference to add could be that in CRA 2.1 you can't use <Type>expression to cast, only expression as Type. Which is a super minor thing as you can't use it in TSX anyway so it only applies to TS files which I believe are usually in a minority in React based TS projects.

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Thanks @tomashubelbauermicrosoft, I've updated the table above. Do you think its worth mentioning the differences from here too?

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Decorators won' bet supported until CRA 2.1.1: facebook/create-react-app#5642

EDIT: Now fixed and released as CRA 2.1.1.

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What are the implications of using Babel vs tsc for transpilation?

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@doxxx Namespaces and casting

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I think we should include babel-loader for typescript files as well because of the super handy babel-plugin-macros. Or perhaps do it opt-in somehow.

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Just tried out CRA 2.1.0.
Looks like linting is based on eslint. And there is too much mismatch between vscode dev environment and linting errors. There is no eslint config file created to customize anything. And I felt documentation was lacking wrt linting in general.

CRA-TS does it perfectly for me. If the console shows an error, vscode shows it too.

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@doxxx I thought I'd read that somewhere too, but can't seem to find any links 😕. If you could post one, that would be awesome 👍

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