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Write src/engine/execute so it can be optimized
Testing with implicitly casted `value` and `value.then` is deoptimizing isPromise, which deoptimizes execute. In this case deoptimizing means that the JavaScript VM cannot compile the functions into a form that can be run faster.
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@ -8,7 +8,11 @@ const {Map} = require('immutable');
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* @return {boolean} True if the value appears to be a Promise.
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* @return {boolean} True if the value appears to be a Promise.
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*/
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*/
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const isPromise = function (value) {
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const isPromise = function (value) {
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return value && value.then && typeof value.then === 'function';
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return (
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value !== null &&
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typeof value === 'object' &&
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typeof value.then === 'function'
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);
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};
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};
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/**
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/**
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