手动引导增加禁引可视域判断

‘liusuyi’

2023-10-28 7786c1a71400a8e1635d2d6c94161a0474c4bb67

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var defineWellKnownSymbol = require('../internals/well-known-symbol-define');
 
// `Symbol.observable` well-known symbol
// https://github.com/tc39/proposal-observable
defineWellKnownSymbol('observable');