TypeScript: variables in catch should be unknown on default settings

[davimiku]

With the following code:

try {
  throw 'not an Error object'
} catch (error) {
  console.error(error.message)
}

The Deno language server shows the type of the error variable as any, which should be unknown and a compiler error. Below is a screenshot of the Deno language server running in Visual Studio Code.

Version information:

deno 1.18.0 (release, x86_64-unknown-linux-gnu)
v8 9.8.177.6
typescript 4.5.2

Since TypeScript v4.4, useUnknownInCatchVariables is activated when strict is true. According to the documentation on deno.land, the default value of strict is true in Deno's default tsconfig, so useUnknownInCatchVariables would be implicitly true by default also.

[dsherret]

It is a major change. See and discuss in #11826

[davimiku]

OK got it, I see. I will open a separate issue to fix the documentation.