TransformCallback - type 'null' is not assignable to parameter of type 'Error'

[mirages]

I write my transform plugin with ts locally, and import the TransformContext and TransformCallback type from karma-typescript:

import type { TransformContext, TransformCallback } from 'karma-typescript'

export default async function (context: TransformContext, cb: TransformCallback) {
  if (/\.(less|css)$/.test(context.filename)) {
    // do something
    cb(null, true)
  } else {
    cb(null, false)
  }
}

When I run my karma.conf.ts with ts-node, an error occurred:

error TS2769: No overload matches this call.
  Overload 1 of 2, '(error: Error, dirty: boolean, transpile?: boolean | undefined): void', gave the following error.
    Argument of type 'null' is not assignable to parameter of type 'Error'.
  Overload 2 of 2, '(error: Error, result: TransformResult): void', gave the following error.
    Argument of type 'null' is not assignable to parameter of type 'Error'.