split cases show error with inline prepend calls

[zerobias]

When event created by prepend directly in cases object, it shows errors in any cases, but everything works ok when unit or cases object created in separated variable

This not works:

split({
  source: fooFx.failData,
  match: (res) => 'ok',
  cases: {
    __: errorSettled.prepend(() => 'ok')
  }
})

This works:

const resultTarget = errorSettled.prepend(() => 'ok')

split({
  source: fooFx.failData,
  match: (res) => 'ok',
  cases: {
    __: resultTarget
  }
})

const cases = {
  __: errorSettled.prepend(() => 'ok')
}

split({
  source: fooFx.failData,
  match: (res) => 'ok',
  cases
})

Link to TS repl

[L117]

This is a TypeScript type inference nuance, cases in this case (No puns intended) is something like Record<string, Event<T>>. This issue can be easily solved by adding as const like this:

split({
  source: fooFx.failData,
  match: (res) => 'ok',
  cases: {
    __: errorSettled.prepend(() => 'ok')
  } as const
});