81 lines
2.5 KiB
JavaScript
81 lines
2.5 KiB
JavaScript
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// Original author: ClearCode Inc.
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// License: MIT
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// Repository: https://github.com/clear-code/js-extended-immutable
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var EXPORTED_SYMBOLS = ['ExtendedImmutable'];
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function ExtendedImmutable(aImmutable, aExtraProperties) {
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var descriptors = {};
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Object.keys(aExtraProperties).forEach(function(aName) {
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descriptors[aName] = Object.getOwnPropertyDescriptor(aExtraProperties, aName);
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});
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var base = Object.create({}, descriptors);
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return new Proxy(base, {
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getPrototypeOf: function(aTarget) {
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return Object.getPrototypeOf(aImmutable);
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},
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setPrototypeOf: function(aTarget, aPrototype) {
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return Object.setPrototypeOf(aImmutable, aPrototype);
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},
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isExtensible: function(aTarget) {
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return Object.isExtensible(aImmutable);
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},
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preventExtensions: function(aTarget) {
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return Object.preventExtensions(aImmutable);
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},
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getOwnPropertyDescriptor: function(aTarget, aProperty) {
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return Object.getOwnPropertyDescriptor(aImmutable, aProperty);
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},
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defineProperty: function(aTarget, aProperty, aDescriptor) {
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return Object.defineProperty(aImmutable, aProperty, aDescriptor);
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},
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has: function(aTarget, aProperty) {
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return aProperty in aImmutable;
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},
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get: function(aTarget, aName, aReceiver) {
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if (descriptors.hasOwnProperty(aName)) {
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let value;
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if (typeof descriptors[aName].get == 'function')
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value = descriptors[aName].get.call(base);
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else
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value = descriptors[aName].value;
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if (typeof value == 'function')
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return value.bind(base);
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else
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return value;
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}
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var value = aImmutable[aName];
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if (typeof value == 'function')
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return value.bind(aImmutable);
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else
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return value;
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},
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set: function(aTarget, aName, aValue, aReceiver) {
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if (descriptors.hasOwnProperty(aName)) {
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if (typeof descriptors[aName].set == 'function')
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return descriptors[aName].set.call(base, aValue);
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else
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return descriptors[aName].value = aValue;
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}
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return aImmutable[aName] = aValue;
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},
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deleteProperty: function(aTarget, aProperty) {
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delete aImmutable[aProperty];
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},
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enumerate: function(aTarget) {
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return Reflect.enumerate(aImmutable);
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},
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ownKeys: function(aTarget) {
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return Object.getOwnPropertyNames(aImmutable);
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},
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apply: function(aTarget, aThis, aArgs) {
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return aImmutable.apply(aThis, aArgs);
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},
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construct: function(aTarget, aArgs) {
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return new aImmutable(...aArgs);
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}
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});
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}
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