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export * as default from "module" syntax should work as per ECMA-262 #39769
Description
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
Activity
DanielRosenwasser commentedon Jul 27, 2020
CC Wenlu Wang (@Kingwl) in case you want to take this on as a follow-up to #34903
Kingwl commentedon Jul 29, 2020
Take a look soon.
DanielRosenwasser commentedon Aug 10, 2020
Thanks Wenlu Wang (@Kingwl)!