119 lines
3.8 KiB
TypeScript
119 lines
3.8 KiB
TypeScript
/**
|
|
* @license
|
|
* Copyright Google LLC All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by an MIT-style license that can be
|
|
* found in the LICENSE file at https://angular.io/license
|
|
*/
|
|
|
|
/*
|
|
* This is necessary for Chrome and Chrome mobile, to enable
|
|
* things like redefining `createdCallback` on an element.
|
|
*/
|
|
|
|
let zoneSymbol: any;
|
|
let _defineProperty: any;
|
|
let _getOwnPropertyDescriptor: any;
|
|
let _create: any;
|
|
let unconfigurablesKey: any;
|
|
|
|
export function propertyPatch() {
|
|
zoneSymbol = Zone.__symbol__;
|
|
_defineProperty = (Object as any)[zoneSymbol('defineProperty')] = Object.defineProperty;
|
|
_getOwnPropertyDescriptor = (Object as any)[zoneSymbol('getOwnPropertyDescriptor')] =
|
|
Object.getOwnPropertyDescriptor;
|
|
_create = Object.create;
|
|
unconfigurablesKey = zoneSymbol('unconfigurables');
|
|
Object.defineProperty = function(obj: any, prop: string, desc: any) {
|
|
if (isUnconfigurable(obj, prop)) {
|
|
throw new TypeError('Cannot assign to read only property \'' + prop + '\' of ' + obj);
|
|
}
|
|
const originalConfigurableFlag = desc.configurable;
|
|
if (prop !== 'prototype') {
|
|
desc = rewriteDescriptor(obj, prop, desc);
|
|
}
|
|
return _tryDefineProperty(obj, prop, desc, originalConfigurableFlag);
|
|
};
|
|
|
|
Object.defineProperties = function(obj, props) {
|
|
Object.keys(props).forEach(function(prop) {
|
|
Object.defineProperty(obj, prop, props[prop]);
|
|
});
|
|
return obj;
|
|
};
|
|
|
|
Object.create = <any>function(obj: any, proto: any) {
|
|
if (typeof proto === 'object' && !Object.isFrozen(proto)) {
|
|
Object.keys(proto).forEach(function(prop) {
|
|
proto[prop] = rewriteDescriptor(obj, prop, proto[prop]);
|
|
});
|
|
}
|
|
return _create(obj, proto);
|
|
};
|
|
|
|
Object.getOwnPropertyDescriptor = function(obj, prop) {
|
|
const desc = _getOwnPropertyDescriptor(obj, prop);
|
|
if (desc && isUnconfigurable(obj, prop)) {
|
|
desc.configurable = false;
|
|
}
|
|
return desc;
|
|
};
|
|
}
|
|
|
|
export function _redefineProperty(obj: any, prop: string, desc: any) {
|
|
const originalConfigurableFlag = desc.configurable;
|
|
desc = rewriteDescriptor(obj, prop, desc);
|
|
return _tryDefineProperty(obj, prop, desc, originalConfigurableFlag);
|
|
}
|
|
|
|
function isUnconfigurable(obj: any, prop: any) {
|
|
return obj && obj[unconfigurablesKey] && obj[unconfigurablesKey][prop];
|
|
}
|
|
|
|
function rewriteDescriptor(obj: any, prop: string, desc: any) {
|
|
// issue-927, if the desc is frozen, don't try to change the desc
|
|
if (!Object.isFrozen(desc)) {
|
|
desc.configurable = true;
|
|
}
|
|
if (!desc.configurable) {
|
|
// issue-927, if the obj is frozen, don't try to set the desc to obj
|
|
if (!obj[unconfigurablesKey] && !Object.isFrozen(obj)) {
|
|
_defineProperty(obj, unconfigurablesKey, {writable: true, value: {}});
|
|
}
|
|
if (obj[unconfigurablesKey]) {
|
|
obj[unconfigurablesKey][prop] = true;
|
|
}
|
|
}
|
|
return desc;
|
|
}
|
|
|
|
function _tryDefineProperty(obj: any, prop: string, desc: any, originalConfigurableFlag: any) {
|
|
try {
|
|
return _defineProperty(obj, prop, desc);
|
|
} catch (error) {
|
|
if (desc.configurable) {
|
|
// In case of errors, when the configurable flag was likely set by rewriteDescriptor(), let's
|
|
// retry with the original flag value
|
|
if (typeof originalConfigurableFlag == 'undefined') {
|
|
delete desc.configurable;
|
|
} else {
|
|
desc.configurable = originalConfigurableFlag;
|
|
}
|
|
try {
|
|
return _defineProperty(obj, prop, desc);
|
|
} catch (error) {
|
|
let descJson: string|null = null;
|
|
try {
|
|
descJson = JSON.stringify(desc);
|
|
} catch (error) {
|
|
descJson = desc.toString();
|
|
}
|
|
console.log(`Attempting to configure '${prop}' with descriptor '${descJson}' on object '${
|
|
obj}' and got error, giving up: ${error}`);
|
|
}
|
|
} else {
|
|
throw error;
|
|
}
|
|
}
|
|
}
|