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Better error message for "Cannot find name" when looking for a type #7900
Description
TypeScript Version:
1.8.7
Code
tsconfig.json
{
"compilerOptions": {
"module": "commonjs",
"target": "es6",
"declaration": true
},
"files": [
"main.ts",
"mytypes.ts"
]
}main.ts
import {MyClassAlias} from './mytypes';
let a: MyClassAlias = new MyClassAlias();mytypes.ts
export class MyClass {
public a: number;
}
export type MyClassAlias = MyClass;Expected behavior:
Object created using alias type.
Actual behavior:
Compilation error:
main.ts(3,27): error TS2304: Cannot find name 'MyClassAlias'.
in vscode (0.10.11) syntax is marked as error as well:
but IntelliSense seems to work:
Activity
jwbay commentedon Apr 6, 2016
a type alias is a compile-time construct. there's no javascript emitted for it, so you can't
newit up.RyanCavanaugh commentedon Apr 6, 2016
This is working as intended (as noted,
typeis only a type; use aconst+typepair if you want both definitions), but we should give a better error message when this happens like we do in other cases where symbol resolution fails in one namespace but would succeed in another.[-]Cannot create object using alias[/-][+]Better error message for "Cannot find name" when looking for a type[/+]hleimig commentedon Jul 23, 2016
What do you guys think of
RyanCavanaugh commentedon Jul 25, 2016
This error message should be general to all cases where you refer to an identifier in a value position which only resolves to something in the type namespace. In other words:
I was thinking something like
mhegazy commentedon Sep 13, 2016
thanks jwbay!