Function cleanup

src/services/lsp/LSPClient.ts:125–128

()

            reject(error)
          }
          const cleanup = (): void => {
            spawnedProcess.removeListener('spawn', onSpawn)
            spawnedProcess.removeListener('error', onError)
          }
          spawnedProcess.once('spawn', onSpawn)
          spawnedProcess.once('error', onError)
        })