{"version":3,"file":"bind.js","sources":["../../../../../../src/govuk/vendor/polyfills/Object/defineProperty.mjs","../../../../../../src/govuk/vendor/polyfills/Function/prototype/bind.mjs"],"sourcesContent":["(function(undefined) {\n\n// Detection from https://github.com/Financial-Times/polyfill-service/blob/master/packages/polyfill-library/polyfills/Object/defineProperty/detect.js\nvar detect = (\n // In IE8, defineProperty could only act on DOM elements, so full support\n // for the feature requires the ability to set a property on an arbitrary object\n 'defineProperty' in Object && (function() {\n \ttry {\n \t\tvar a = {};\n \t\tObject.defineProperty(a, 'test', {value:42});\n \t\treturn true;\n \t} catch(e) {\n \t\treturn false\n \t}\n }())\n)\n\nif (detect) return\n\n// Polyfill from https://cdn.polyfill.io/v2/polyfill.js?features=Object.defineProperty&flags=always\n(function (nativeDefineProperty) {\n\n\tvar supportsAccessors = Object.prototype.hasOwnProperty('__defineGetter__');\n\tvar ERR_ACCESSORS_NOT_SUPPORTED = 'Getters & setters cannot be defined on this javascript engine';\n\tvar ERR_VALUE_ACCESSORS = 'A property cannot both have accessors and be writable or have a value';\n\n\tObject.defineProperty = function defineProperty(object, property, descriptor) {\n\n\t\t// Where native support exists, assume it\n\t\tif (nativeDefineProperty && (object === window || object === document || object === Element.prototype || object instanceof Element)) {\n\t\t\treturn nativeDefineProperty(object, property, descriptor);\n\t\t}\n\n\t\tif (object === null || !(object instanceof Object || typeof object === 'object')) {\n\t\t\tthrow new TypeError('Object.defineProperty called on non-object');\n\t\t}\n\n\t\tif (!(descriptor instanceof Object)) {\n\t\t\tthrow new TypeError('Property description must be an object');\n\t\t}\n\n\t\tvar propertyString = String(property);\n\t\tvar hasValueOrWritable = 'value' in descriptor || 'writable' in descriptor;\n\t\tvar getterType = 'get' in descriptor && typeof descriptor.get;\n\t\tvar setterType = 'set' in descriptor && typeof descriptor.set;\n\n\t\t// handle descriptor.get\n\t\tif (getterType) {\n\t\t\tif (getterType !== 'function') {\n\t\t\t\tthrow new TypeError('Getter must be a function');\n\t\t\t}\n\t\t\tif (!supportsAccessors) {\n\t\t\t\tthrow new TypeError(ERR_ACCESSORS_NOT_SUPPORTED);\n\t\t\t}\n\t\t\tif (hasValueOrWritable) {\n\t\t\t\tthrow new TypeError(ERR_VALUE_ACCESSORS);\n\t\t\t}\n\t\t\tObject.__defineGetter__.call(object, propertyString, descriptor.get);\n\t\t} else {\n\t\t\tobject[propertyString] = descriptor.value;\n\t\t}\n\n\t\t// handle descriptor.set\n\t\tif (setterType) {\n\t\t\tif (setterType !== 'function') {\n\t\t\t\tthrow new TypeError('Setter must be a function');\n\t\t\t}\n\t\t\tif (!supportsAccessors) {\n\t\t\t\tthrow new TypeError(ERR_ACCESSORS_NOT_SUPPORTED);\n\t\t\t}\n\t\t\tif (hasValueOrWritable) {\n\t\t\t\tthrow new TypeError(ERR_VALUE_ACCESSORS);\n\t\t\t}\n\t\t\tObject.__defineSetter__.call(object, propertyString, descriptor.set);\n\t\t}\n\n\t\t// OK to define value unconditionally - if a getter has been specified as well, an error would be thrown above\n\t\tif ('value' in descriptor) {\n\t\t\tobject[propertyString] = descriptor.value;\n\t\t}\n\n\t\treturn object;\n\t};\n}(Object.defineProperty));\n})\n.call('object' === typeof window && window || 'object' === typeof self && self || 'object' === typeof global && global || {});\n","import '../../Object/defineProperty.mjs'\n\n(function(undefined) {\n // Detection from https://github.com/Financial-Times/polyfill-service/blob/master/packages/polyfill-library/polyfills/Function/prototype/bind/detect.js\n var detect = 'bind' in Function.prototype\n\n if (detect) return\n\n // Polyfill from https://cdn.polyfill.io/v2/polyfill.js?features=Function.prototype.bind&flags=always\n Object.defineProperty(Function.prototype, 'bind', {\n value: function bind(that) { // .length is 1\n // add necessary es5-shim utilities\n var $Array = Array;\n var $Object = Object;\n var ObjectPrototype = $Object.prototype;\n var ArrayPrototype = $Array.prototype;\n var Empty = function Empty() {};\n var to_string = ObjectPrototype.toString;\n var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';\n var isCallable; /* inlined from https://npmjs.com/is-callable */ var fnToStr = Function.prototype.toString, tryFunctionObject = function tryFunctionObject(value) { try { fnToStr.call(value); return true; } catch (e) { return false; } }, fnClass = '[object Function]', genClass = '[object GeneratorFunction]'; isCallable = function isCallable(value) { if (typeof value !== 'function') { return false; } if (hasToStringTag) { return tryFunctionObject(value); } var strClass = to_string.call(value); return strClass === fnClass || strClass === genClass; };\n var array_slice = ArrayPrototype.slice;\n var array_concat = ArrayPrototype.concat;\n var array_push = ArrayPrototype.push;\n var max = Math.max;\n // /add necessary es5-shim utilities\n\n // 1. Let Target be the this value.\n var target = this;\n // 2. If IsCallable(Target) is false, throw a TypeError exception.\n if (!isCallable(target)) {\n throw new TypeError('Function.prototype.bind called on incompatible ' + target);\n }\n // 3. Let A be a new (possibly empty) internal list of all of the\n // argument values provided after thisArg (arg1, arg2 etc), in order.\n // XXX slicedArgs will stand in for \"A\" if used\n var args = array_slice.call(arguments, 1); // for normal call\n // 4. Let F be a new native ECMAScript object.\n // 11. Set the [[Prototype]] internal property of F to the standard\n // built-in Function prototype object as specified in 15.3.3.1.\n // 12. Set the [[Call]] internal property of F as described in\n // 15.3.4.5.1.\n // 13. Set the [[Construct]] internal property of F as described in\n // 15.3.4.5.2.\n // 14. Set the [[HasInstance]] internal property of F as described in\n // 15.3.4.5.3.\n var bound;\n var binder = function () {\n\n if (this instanceof bound) {\n // 15.3.4.5.2 [[Construct]]\n // When the [[Construct]] internal method of a function object,\n // F that was created using the bind function is called with a\n // list of arguments ExtraArgs, the following steps are taken:\n // 1. Let target be the value of F's [[TargetFunction]]\n // internal property.\n // 2. If target has no [[Construct]] internal method, a\n // TypeError exception is thrown.\n // 3. Let boundArgs be the value of F's [[BoundArgs]] internal\n // property.\n // 4. Let args be a new list containing the same values as the\n // list boundArgs in the same order followed by the same\n // values as the list ExtraArgs in the same order.\n // 5. Return the result of calling the [[Construct]] internal\n // method of target providing args as the arguments.\n\n var result = target.apply(\n this,\n array_concat.call(args, array_slice.call(arguments))\n );\n if ($Object(result) === result) {\n return result;\n }\n return this;\n\n } else {\n // 15.3.4.5.1 [[Call]]\n // When the [[Call]] internal method of a function object, F,\n // which was created using the bind function is called with a\n // this value and a list of arguments ExtraArgs, the following\n // steps are taken:\n // 1. Let boundArgs be the value of F's [[BoundArgs]] internal\n // property.\n // 2. Let boundThis be the value of F's [[BoundThis]] internal\n // property.\n // 3. Let target be the value of F's [[TargetFunction]] internal\n // property.\n // 4. Let args be a new list containing the same values as the\n // list boundArgs in the same order followed by the same\n // values as the list ExtraArgs in the same order.\n // 5. Return the result of calling the [[Call]] internal method\n // of target providing boundThis as the this value and\n // providing args as the arguments.\n\n // equiv: target.call(this, ...boundArgs, ...args)\n return target.apply(\n that,\n array_concat.call(args, array_slice.call(arguments))\n );\n\n }\n\n };\n\n // 15. If the [[Class]] internal property of Target is \"Function\", then\n // a. Let L be the length property of Target minus the length of A.\n // b. Set the length own property of F to either 0 or L, whichever is\n // larger.\n // 16. Else set the length own property of F to 0.\n\n var boundLength = max(0, target.length - args.length);\n\n // 17. Set the attributes of the length own property of F to the values\n // specified in 15.3.5.1.\n var boundArgs = [];\n for (var i = 0; i < boundLength; i++) {\n array_push.call(boundArgs, '$' + i);\n }\n\n // XXX Build a dynamic function with desired amount of arguments is the only\n // way to set the length property of a function.\n // In environments where Content Security Policies enabled (Chrome extensions,\n // for ex.) all use of eval or Function costructor throws an exception.\n // However in all of these environments Function.prototype.bind exists\n // and so this code will never be executed.\n bound = Function('binder', 'return function (' + boundArgs.join(',') + '){ return binder.apply(this, arguments); }')(binder);\n\n if (target.prototype) {\n Empty.prototype = target.prototype;\n bound.prototype = new Empty();\n // Clean up dangling references.\n Empty.prototype = null;\n }\n\n // TODO\n // 18. Set the [[Extensible]] internal property of F to true.\n\n // TODO\n // 19. Let thrower be the [[ThrowTypeError]] function Object (13.2.3).\n // 20. Call the [[DefineOwnProperty]] internal method of F with\n // arguments \"caller\", PropertyDescriptor {[[Get]]: thrower, [[Set]]:\n // thrower, [[Enumerable]]: false, [[Configurable]]: false}, and\n // false.\n // 21. Call the [[DefineOwnProperty]] internal method of F with\n // arguments \"arguments\", PropertyDescriptor {[[Get]]: thrower,\n // [[Set]]: thrower, [[Enumerable]]: false, [[Configurable]]: false},\n // and false.\n\n // TODO\n // NOTE Function objects created using Function.prototype.bind do not\n // have a prototype property or the [[Code]], [[FormalParameters]], and\n // [[Scope]] internal properties.\n // XXX can't delete prototype in pure-js.\n\n // 22. Return F.\n return bound;\n }\n });\n})\n.call('object' === typeof window && window || 'object' === typeof self && self || 'object' === typeof global && global || 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