bug: types broken after setting a basepath

[thenbe]

What version of Hono are you using?

4.4.0

What runtime/platform is your app running on?

node

What steps can reproduce the bug?

Typescript playground repro: link

What is the expected behavior?

There should be a way to create a typed testClient when using a basepath.

What do you see instead?

testClient types are broken when using a basepath.

Additional information

No response

[EdamAme-x]

I understood.
The type of Env is conflict.

Argument of type 'Hono<Env, BlankSchema, "/mybasepath">' is not assignable to parameter of type 'Hono<{}, { "/mybasepath/items": { $get: { input: {}; output: { id: number; }; outputFormat: "json"; status: 100 | 101 | 102 | 103 | 200 | 201 | 202 | 203 | 204 | 205 | 206 | 207 | 208 | 226 | 300 | 301 | ... 47 more ... | -1; }; }; }, "/mybasepath">'.
  Types of property 'fetch' are incompatible.
    Type '(request: Request, Env?: {} | Bindings | undefined, executionCtx?: ExecutionContext | undefined) => Response | Promise<Response>' is not assignable to type '(request: Request, Env?: unknown, executionCtx?: ExecutionContext | undefined) => Response | Promise<Response>'.
      Types of parameters 'Env' and 'Env' are incompatible.
        Type 'unknown' is not assignable to type '{} | Bindings | undefined

Env has two types of {} and unknown.

[EdamAme-x]

hono/src/helper/testing/index.ts

Line 18 in dfbc6c4

Env?: ExtractEnv<T>['Bindings'] | {},

[EdamAme-x]

Explicitly unknown is not specified.

[EdamAme-x]

[EdamAme-x]

[EdamAme-x]

ReturnType of ".get" is broken...?

[EdamAme-x]

[EdamAme-x]

enviroment in not using basePath

[EdamAme-x]

Either way, the returnType Env of .get will be unknown.

[EdamAme-x]

[EdamAme-x]

maybe IntersectNonAnyTypes<[E, E2]> is unknown

[EdamAme-x]

@thenbe

This problem can be worked around by specifying the Env directly.
But this is only temporary.