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One of the most touted features is "your JavaScript is already valid TypeScript" (or pretty close), so I think they will keep the defaults so that JS developers can just change the .js to .ts and be up and running with as little friction as possible.

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Well, with the last release, typescriot supposedly can compile plain js.

https://github.com/Microsoft/TypeScript/wiki/What%27s-new-in...

That should make it simple to treat ts more strict than js.

> Well, with the last release, typescriot supposedly can compile plain js.

How does the ability to compile plain JS alter its goal of being a JS superset?

Because it can compile plain JS using the rules present under plain JS, such as nullable and undefined-able types by default, regardless of the rules it's using to compile TS.

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