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