fix: several bugs detected in ts-parser

[angrychow]

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fix: several bugs detected in ts-parser

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1. 修复 ts-parser 无法识别形如

export default () => {
  console.log("test")
}

的问题

2. 修复同一 package 下符号重名没有赋 mangled name 的问题。
3. 修复了错误的符号解析缓存机制。