Function onStdout

integrations/utils.ts:326–331

(predicate: (message: string) => boolean)

              stderrMessages.splice(0)
            },
            onStdout(predicate: (message: string) => boolean) {
              return new Promise<void>((resolve) => {
                stdoutActors.push({ predicate, resolve })
                notifyNext(stdoutActors, stdoutMessages)
              })
            },
            onStderr(predicate: (message: string) => boolean) {
              return new Promise<void>((resolve) => {
                stderrActors.push({ predicate, resolve })