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Extends shorthand `<` and negated forms #907

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edemaine merged 3 commits into main from extends

Jan 3, 2024

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edemaine commented Jan 2, 2024 •

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As requested by @esthedebeste on Discord, this PR adds:

< shorthand for extends in type conditions, matching existing support in classes
Negated forms not extends, !<, and not< (though the last is a little ugly), via the trick of swapping the then/else clauses.
Tighten some __ and change a NotDedented from last PR to IndentedFurther. Otherwise we accidentally think there is extension going on in e.g. this test:
```
type T = undefined
<div />
```

Support for unless ... not extends ... is my first legit use of logical xor. 😸

edemaine added 3 commits

January 2, 2024 13:52


          extends shorthand < in type conditions

4031f7d


          not extends

bc12bf8


          Document < and <! in type conditions

0d5bb6b

edemaine temporarily deployed to build

January 2, 2024 19:30

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STRd6 approved these changes

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edemaine merged commit 6f34d26 into main

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edemaine deleted the extends branch

January 3, 2024 05:56

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