- var global = require('../internals/global');
- var isCallable = require('../internals/is-callable');
- var wellKnownSymbol = require('../internals/well-known-symbol');
- var $$OBSERVABLE = wellKnownSymbol('observable');
- var NativeObservable = global.Observable;
- var NativeObservablePrototype = NativeObservable && NativeObservable.prototype;
- module.exports = !isCallable(NativeObservable)
- || !isCallable(NativeObservable.from)
- || !isCallable(NativeObservable.of)
- || !isCallable(NativeObservablePrototype.subscribe)
- || !isCallable(NativeObservablePrototype[$$OBSERVABLE]);
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