[NodeJS] tsc error

[shadow88sky]

Please answer these questions before submitting your issue.

• Why do you submit this issue?
• Question or discussion
• Bug
• Requirement
• Feature or performance improvement

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Bug

• Which version of SkyWalking, OS, and JRE?
  "skywalking-backend-js": "^0.1.0"

• What happened?
  tsc error:
  node_modules/skywalking-backend-js/lib/trace/span/Span.d.ts:25:10 - error TS2305: Module '"../../../../../../../../../../../Users/chenxu/Desktop/product/Gaia/maya/node_modules/skywalking-backend-js/lib/proto/language-agent/Tracing_pb"' has no exported member 'SpanLayer'.

import { SpanLayer, SpanType } from '../../proto/language-agent/Tracing_pb';