Suggestion Backlog Slog, 5/16/2016 #8628

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1. Ryan Cavanaugh (RyanCavanaugh)

   added

   Design NotesNotes from our design meetingsNotes from our design meetings

   on May 16, 2016
2. RyanCavanaugh commented on May 16, 2016

   

   Ryan Cavanaugh (RyanCavanaugh)

   on May 16, 2016

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   Rest/spread for objects

   • Will this keep its current semantics?
   • Would need to do this under a flag because it might change
   • Lots of work to do this in the type system
   • Not room in 2.0 schedule
   • JSDoc autocomplete should not apply to classes #7325 Do not apply JSDoc template to classes
     • User would prefer one line
     • 👎 no consensus on what people want in practice
   • Type Merging between extends and intersection #8606 Type Merging between extends and intersection
     • Signatures need to be sorted, but we have no idea how
     • Lots of ad hoc rules here in the past
     • 👍 stable-sort by how many string literals exist
   • add a flag to disable () => void being subtype of () => a #8584 Flag to make () => void not subtype of () => {}
     • See also Result value must be used check #8240 Result value must be used check
     • Rust has 'must_use' annotation
     • If we had attributes this would be neat
       • But we don't
       • (Go back to 1)
     • Revisit if we get attriubtes
   • Make default JSX mode "react" #8529 Make ".tsx" extension optional
     • Not clear on scenario (is complaint that there two steps, or the extension itself?)
     • 👍 Change the default JSX emit to 'react'
   • Should error when unwrapping an unwrappable variable #8453 Should error when unwrapping an unwrappable variable
     • No-op is suspicious
     • Dangerous because now improving control flow analysis could be an unexpected breaking change
     • 👎 We don't think this should be an error
   • noImplicitAny checks don't work for a setter parameter of Object.defineProperty #8410 noImplicitAny checks don't work for a setter parameter of Object.defineProperty
     • 👎 Working as intended
   • Support overriding type-checking compile flags on a per file basis #8405 Support overriding type-checking compile flags on a per file basis
     • Mohamed to follow up, refer to reply to Cyrus's comment in Non-nullable types #7140
   • Allow passing additional SupportedExtensions to support React Native .android and .ios module loading #8328 Allow passing additional SupportedExtensions to support React Native .android and .ios module loading
     • Make a .d.ts and use export implements foo
   • Should awaiting a non-Promise value be an error? #8310 Should awaiting a non-Promise value be an error?
     • According to the spec, you can await a non-Promise value and that returns the value
     • 👎 Works according to ES spec (which could have easily chosen this to be an error, but didn't)
   • Support final classes (non-subclassable) #8306 Support final classes (non-subclassable)
     • final is classically a perf optimization, not truly a type system thing
   • Always allow code before super call when it does not use "this" #8277 Always allow code before super call when it does not use "this"
     • We can use flow analysis to do this now
     • Committed (post-2.0)
   • Compiler should rewrite namespaced types found in JSDoc #8120 Compiler should rewrite namespaced types found in JSDoc
     • Too complex (emitter currently does nothing to comments)
   • Question: Why does "this" not have a type in function assigned to class prototype  #8024 Provide a "this" type in function assigned to class prototype
     • We do this for JavaScript
     • Let's do it for TS too
     • 👍 should be tiny change
   • Suggestion: execute property initializer expressions at the expected time #7738 Execute property initializer expressions in the correct scope
     • 👍 Accepting PRs or we can handle post-2.0
   • Cannot access properties of type parameter constrainted by 'any' #7700 Cannot access properties of type parameter constrainted by 'any'
     • Treat as bug
   • option to control allowed source version with newer TS version #7573 option to control allowed source version with newer TS version
     • Too complex
   • throw in arrow functions forces a void return type #7538 throw in arrow functions forces a void return type
     • This ought to work
     • Plumb through noreturn
     • Assign to Anders
   • Cannot use 'this' type in type argument on base types #7289 Cannot use 'this' type in type argument on base types
     • Out of time
3. Ryan Cavanaugh (RyanCavanaugh)

   self-assigned this

   on May 16, 2016
4. kitsonk commented on May 17, 2016

   

   Kitson Kelly (kitsonk)

   on May 17, 2016

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   As always, thanks for slogging!

   👍React with 👍1Reacted by jwbay
5. Mohamed Hegazy (mhegazy)

   closed this as completedon May 17, 2016
6. microsoft

   locked and limited conversation to collaborators on Jun 19, 2018