Type guard - type propagation

[senyaak]

If I use variable which has type set via type guard in nested anonymous class - it becomes of type any.
TypeScript Version: 3.8.3

Search Terms: Type guard, type propagation

Code

function isError(error: Error | any): error is Error {
 return error instanceof Error;
}

try {
 throw new Error('test');
} catch(hookError) {
 if(isError(hookError)) {
 
 const errorHandler = class extends Error {
 
 log() {
 // hookError is any
 console.log(hookError.message);
 }
 };
 } else {
 throw hookError;
 }
}

Expected behavior: hookError in console.log should have type Error

Actual behavior: hookError has type any

Playground Link: http://www.typescriptlang.org/play/?ssl=21&ssc=1&pln=1&pc=1#code/GYVwdgxgLglg9mABDAzgUQE4bhgFAUyxwC5FNsNEAfRAQzAE8BKUwi5FMoygbwChEiDPiggMSNjmRgUUehHxxgXCgG4+AXz58oGBon6DBUABbYA7ojD5L5HLgDkUfLIdN1GxBFpQIJ3CZwcADWdhhMBgJGMMC4qGEBQaHcTBGGRlFGRhAIsoiSGAAS9AAmADaEiAC8XmW0KJz4AB7OYCWcYZFZmVm9ZXAA5rhpPb1jiAD0E4iBIZ2odIyj41k5MnAVAHT9Q7PJFJsAti4otAP47stjWisa6lme+GUo+F3jphYzSWH3RlpaQA

Related Issues: I think this #30557 could be same issue, but not sure

[MartinJohns]

Most likely the same issue as #9998.

[RyanCavanaugh]

In addition to #9998, hookError has type any, and anys don't get narrowed by type guards. See other issues on annotated catch clause variables.

[typescript-bot]

This issue has been marked 'Working as Intended' and has seen no recent activity. It has been automatically closed for house-keeping purposes.