CODEWITHSUNDEEP
typescripttypescript-generics
Ben Walters
Ben Walters

Reputation: 109

Typescript Error "Object is of type 'unknown'."

Yesterday, whilst working on the codebase, we had no issues whatsoever.

This morning, on the other hand, we have walked into every error being treated as Unknown vs the previous any type.

How can I revert this change. I can only find a pile of terribly confusing github convos which allude to the change, but none which actually specify in which version this breaking change was added.

TIA.

Upvotes: 6

Views: 6163

Answers (2)

basarat
basarat

Reputation: 275927

none which actually specify in which version this breaking change was added

This is a new feature of TypeScript 4.4. Catch parameters now default to unknown. This makes the error handling safer. As you have found "useUnknownInCatchVariables": false is one workaround.

However I recommend not setting this option to allow safety for future code, and instead adding explicit any if that makes sense or adding custom type guards to take benefit from the safety in existing code.

More

Upvotes: 7

Ben Walters
Ben Walters

Reputation: 109

After a ton of googling, I found this in a playground comment...

"useUnknownInCatchVariables": false, in your compiler options will fix it.

Upvotes: 4

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