68 lines
1.8 KiB
TypeScript
68 lines
1.8 KiB
TypeScript
import {zoneSymbol} from "./utils";
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// might need similar for object.freeze
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// i regret nothing
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var _defineProperty = Object.defineProperty;
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var _getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
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var _create = Object.create;
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var unconfigurablesKey = zoneSymbol('unconfigurables');
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export function propertyPatch() {
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Object.defineProperty = function (obj, prop, desc) {
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if (isUnconfigurable(obj, prop)) {
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throw new TypeError('Cannot assign to read only property \'' + prop + '\' of ' + obj);
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}
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if (prop !== 'prototype') {
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desc = rewriteDescriptor(obj, prop, desc);
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}
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return _defineProperty(obj, prop, desc);
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};
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Object.defineProperties = function (obj, props) {
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Object.keys(props).forEach(function (prop) {
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Object.defineProperty(obj, prop, props[prop]);
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});
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return obj;
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};
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Object.create = function (obj, proto) {
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if (typeof proto === 'object') {
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Object.keys(proto).forEach(function (prop) {
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proto[prop] = rewriteDescriptor(obj, prop, proto[prop]);
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});
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}
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return _create(obj, proto);
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};
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Object.getOwnPropertyDescriptor = function (obj, prop) {
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var desc = _getOwnPropertyDescriptor(obj, prop);
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if (isUnconfigurable(obj, prop)) {
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desc.configurable = false;
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}
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return desc;
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};
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};
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export function _redefineProperty(obj, prop, desc) {
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desc = rewriteDescriptor(obj, prop, desc);
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return _defineProperty(obj, prop, desc);
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};
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function isUnconfigurable (obj, prop) {
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return obj && obj[unconfigurablesKey] && obj[unconfigurablesKey][prop];
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}
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function rewriteDescriptor (obj, prop, desc) {
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desc.configurable = true;
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if (!desc.configurable) {
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if (!obj[unconfigurablesKey]) {
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_defineProperty(obj, unconfigurablesKey, { writable: true, value: {} });
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}
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obj[unconfigurablesKey][prop] = true;
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}
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return desc;
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}
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