Suggestion Backlog Slog, 10/5/2015 #5119

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1. Ryan Cavanaugh (RyanCavanaugh)

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   Design NotesNotes from our design meetingsNotes from our design meetings

   on Oct 5, 2015
2. RyanCavanaugh commented on Oct 5, 2015

   

   Ryan Cavanaugh (RyanCavanaugh)

   on Oct 5, 2015

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   • Suggestion: Add the nameof compile-time operator to convert property and function names into strings #1579 nameof operator
     • Some overlap with memberof proposal we have floating around somewhere
     • What if Rename / Find References solved this instead?
     • Punt and see if related approved suggestions address this sufficiently
   • Contextual typing of object literal getters not working for return expressions #1611 contextually type getter return statements in object literal methods
     • Won't Fix due to complexity in how we fix parameters during overload resolution and lack of feedback
   • Support proposed ES Rest/Spread properties #2103 rest/spread object properties (Stage 2 ES7 proposal), https://github.com/sebmarkbage/ecmascript-rest-spread
     • May or may not happen in ES7
     • Wait until it gets closer to landed before we commit to any semantics
   • Index signature parameter type should allow for enums #2491 allow enums as index signature keys
     • Meh.
   • Cannot do anything before super() #3311 relax rules around super call
     • 👍 disallow access to this in lexically-before super calls
   • Should treat const and enum (at least const enum) value the same as literals for indexers. #3411 indexing by a const enum should be the same as a literal (in tuples)
     • 👍 for const enums only
   • T.constructor should be of type T #3841 constructor property of classes should point to the static side of the class
     • This isn't actually statically true
     • ... but neither are some other things we say
     • Accepting PRs
   • Proposal: Expose collection element's type #3749 allow var x: typeof expr[0] (useful for arrays and tuples)
     • 👍 allow numeric and string literals only in the brackets
   • Transpile separate scope in each for loop iteration with let and ES5 #3915 downlevel emit captured lets in for loops
     • We error in this case instead of screwing you over
     • Vlad has a proposal / PR
     • Disallow labelled break in this case, but allow standard break
     • Make sure to hoist vars in the body
     • 👍
   • Publish typescript on Bower #4035 publish TypeScript on Bower
     • 👍 accepting PRs
   • Consider only showing builders in object literal completions its contextual type has an index signature #4089 when an object literal is contextually typed by an unindexed type, don't set allowNewIdentifiers = true in the LS
     • 👎 we screw this up in the wrong direction too often
   • Parameter signatures of functions in object literals are not always inferred correctly. #4241 contextually type function parameters even when other parameters have type annotations
     • Breaking change, but in a good way. "Fixing" change under noImplicitAny
     • 👍 Accepting PRs
   • Syntax suggestion: Ignore last void parameters #4260 allow trailing void parameters to be omitted in function calls
     • 👍 Accepting PRs
   • Expanded type guard suggestions #4868 more type guards (typeof x === 'function' or 'object')
     • 👍 Accepting PRs. Do we have any other pending type guard work?
   • Infer Type Guard Return Values #5101 when a function's return expression is a recognized type guard (e.g. x instanceof y), automatically infer the function itself to be a type guard
     • Too complex, low-yield. Write isFoo separately (and generically?) to get this to work
3. Ryan Cavanaugh (RyanCavanaugh)

   closed this as completedon Oct 5, 2015
4. microsoft

   locked and limited conversation to collaborators on Jun 19, 2018