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Declaring index signature based on property type gives invalid error #30982
Description
TypeScript Version: latest, demonstrable on playground (links below)
Search Terms: index signature diagnostics property type
Code:
interface BaseNode {
kind: string;
[key: string]: string | TokenNode["data"];
}
interface TokenNode extends BaseNode {
kind: 'token';
data: TokenData;
}
interface TokenData {
offset: number;
width: number;
leading_width: number;
trailing_width: number;
}Expected behavior:
No errors, as the code is correct.
Actual behavior:
An error on interface TokenNode:
Interface 'TokenNode' incorrectly extends interface 'BaseNode'.
Index signature is missing in type 'TokenNode'.
HOWEVER if I change TokenNode["data"] to its value TokenData, the error goes away.
Playground Link:
Code above displaying the error
Code above with the fix, no errors
Reacted by Szymon Marczak
Activity
RyanCavanaugh commentedon Apr 17, 2019
Current behavior dates back to 2.1