Description

Hugh Crail (HughCrail)

opened on Jul 27, 2020

Issue body actions

TypeScript Version: 4.0.0-beta

Search Terms:
ESModule, export star as default, "export * as default from"

Expected behavior:
export * as default from "module" should export the namespace of "module" as the default export.
This is valid ES Module syntax from this stage-4 proposal. See the test in test-262.
I also tested this syntax in Chrome and it was supported.

Actual behavior:
You get the following errors:

• "Cannot find name 'from'."
• "Identifier expected. 'default' is a reserved word that cannot be used here."
• "';' expected."

Code

export * as default from "rollup";

Output

export * as  from ;
from;
"rollup";

Compiler Options

{
  "compilerOptions": {
    "noImplicitAny": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "strictPropertyInitialization": true,
    "strictBindCallApply": true,
    "noImplicitThis": true,
    "noImplicitReturns": true,
    "alwaysStrict": true,
    "esModuleInterop": true,
    "declaration": true,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "moduleResolution": 2,
    "target": "Latest",
    "jsx": "React",
    "module": "ESNext"
  }
}

Playground Link: Provided

Reacted by ExE Boss, ZHAO Jin-Xiang, Kubilay Kahveci, Rob Palmer, Alex Eden, Kirill Groshkov, Itay Ganor, Magnus Markling, Nate Ryall, Mateja Petrovic and 2 more

Reacted by Dmytro Demensky

Reacted by ExE Boss

Activity

1. Daniel Rosenwasser (DanielRosenwasser)

   added

   ES NextNew featurers for ECMAScript (a.k.a. ESNext)New featurers for ECMAScript (a.k.a. ESNext)

   SuggestionAn idea for TypeScriptAn idea for TypeScript

   on Jul 27, 2020
2. Daniel Rosenwasser (DanielRosenwasser)

   added this to the TypeScript 4.1.0 milestone on Jul 27, 2020
3. Daniel Rosenwasser (DanielRosenwasser)

   added

   BugA bug in TypeScriptA bug in TypeScript

   and removed

   SuggestionAn idea for TypeScriptAn idea for TypeScript

   on Jul 27, 2020
4. Daniel Rosenwasser (DanielRosenwasser)

   assigned

   Nathan Shively-Sanders (sandersn)

   on Jul 27, 2020
5. Daniel Rosenwasser (DanielRosenwasser)

   added

   Effort: ModerateRequires experience with the TypeScript codebase, but feasible. Harder than "Effort: Casual".Requires experience with the TypeScript codebase, but feasible. Harder than "Effort: Casual".

   help wanted

   on Jul 27, 2020
6. DanielRosenwasser commented on Jul 27, 2020

   

   Daniel Rosenwasser (DanielRosenwasser)

   on Jul 27, 2020

   Member

   More actions

   CC Wenlu Wang (@Kingwl) in case you want to take this on as a follow-up to #34903
7. Kingwl commented on Jul 29, 2020

   

   Wenlu Wang (Kingwl)

   on Jul 29, 2020

   Contributor

   More actions

   Take a look soon.
8. TypeScript Bot (typescript-bot)

   added

   Fix AvailableA PR has been opened for this issueA PR has been opened for this issue

   on Jul 29, 2020
9. Daniel Rosenwasser (DanielRosenwasser)

   closed this as completedin #39803on Aug 10, 2020
10. DanielRosenwasser commented on Aug 10, 2020

    

    Daniel Rosenwasser (DanielRosenwasser)

    on Aug 10, 2020

    Member

    More actions

    Thanks Wenlu Wang (@Kingwl)!
11. microsoft

    locked as resolved and limited conversation to collaborators on Oct 21, 2025

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