Commit

1 files changed, 70 insertions, 0 deletions

diff --git a/src/node_modules/is-callable/index.js b/src/node_modules/is-callable/index.js
new file mode 100644
index 0000000..f1f6c44
--- /dev/null
+++ b/src/node_modules/is-callable/index.js
@@ -0,0 +1,70 @@
+'use strict';
+
+var fnToStr = Function.prototype.toString;
+var reflectApply = typeof Reflect === 'object' && Reflect !== null && Reflect.apply;
+var badArrayLike;
+var isCallableMarker;
+if (typeof reflectApply === 'function' && typeof Object.defineProperty === 'function') {
+	try {
+		badArrayLike = Object.defineProperty({}, 'length', {
+			get: function () {
+				throw isCallableMarker;
+			}
+		});
+		isCallableMarker = {};
+		// eslint-disable-next-line no-throw-literal
+		reflectApply(function () { throw 42; }, null, badArrayLike);
+	} catch (_) {
+		if (_ !== isCallableMarker) {
+			reflectApply = null;
+		}
+	}
+} else {
+	reflectApply = null;
+}
+
+var constructorRegex = /^\s*class\b/;
+var isES6ClassFn = function isES6ClassFunction(value) {
+	try {
+		var fnStr = fnToStr.call(value);
+		return constructorRegex.test(fnStr);
+	} catch (e) {
+		return false; // not a function
+	}
+};
+
+var tryFunctionObject = function tryFunctionToStr(value) {
+	try {
+		if (isES6ClassFn(value)) { return false; }
+		fnToStr.call(value);
+		return true;
+	} catch (e) {
+		return false;
+	}
+};
+var toStr = Object.prototype.toString;
+var fnClass = '[object Function]';
+var genClass = '[object GeneratorFunction]';
+var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
+
+module.exports = reflectApply
+	? function isCallable(value) {
+		if (!value) { return false; }
+		if (typeof value !== 'function' && typeof value !== 'object') { return false; }
+		if (typeof value === 'function' && !value.prototype) { return true; }
+		try {
+			reflectApply(value, null, badArrayLike);
+		} catch (e) {
+			if (e !== isCallableMarker) { return false; }
+		}
+		return !isES6ClassFn(value);
+	}
+	: function isCallable(value) {
+		if (!value) { return false; }
+		if (typeof value !== 'function' && typeof value !== 'object') { return false; }
+		if (typeof value === 'function' && !value.prototype) { return true; }
+		if (hasToStringTag) { return tryFunctionObject(value); }
+		if (isES6ClassFn(value)) { return false; }
+		var strClass = toStr.call(value);
+		return strClass === fnClass || strClass === genClass;
+	};