本文整理匯總了TypeScript中@ember/-internals/meta.Meta.writeDescriptors方法的典型用法代碼示例。如果您正苦於以下問題：TypeScript Meta.writeDescriptors方法的具體用法？TypeScript Meta.writeDescriptors怎麽用？TypeScript Meta.writeDescriptors使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類@ember/-internals/meta.Meta的用法示例。
在下文中一共展示了Meta.writeDescriptors方法的2個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的TypeScript代碼示例。
示例1: defineProperty
export function defineProperty(
obj: object,
keyName: string,
desc: Descriptor | undefined | null,
data?: any | undefined | null,
meta?: Meta
) {
if (meta === undefined) {
meta = metaFor(obj);
}
let watching = meta.peekWatching(keyName) > 0;
let previousDesc = descriptorFor(obj, keyName, meta);
let wasDescriptor = previousDesc !== undefined;
if (wasDescriptor) {
previousDesc.teardown(obj, keyName, meta);
meta.removeDescriptors(keyName);
}
// used to track if the the property being defined be enumerable
let enumerable = true;
// Ember.NativeArray is a normal Ember.Mixin that we mix into `Array.prototype` when prototype extensions are enabled
// mutating a native object prototype like this should _not_ result in enumerable properties being added (or we have significant
// issues with things like deep equality checks from test frameworks, or things like jQuery.extend(true, [], [])).
//
// this is a hack, and we should stop mutating the array prototype by default 😫
if (obj === Array.prototype) {
enumerable = false;
}
let value;
if (desc instanceof Descriptor) {
value = desc;
Object.defineProperty(obj, keyName, {
configurable: true,
enumerable,
get: DESCRIPTOR_GETTER_FUNCTION(keyName, value),
});
meta.writeDescriptors(keyName, value);
desc.setup(obj, keyName);
} else if (desc === undefined || desc === null) {
value = data;
if (DEBUG && watching) {
meta.writeValues(keyName, data);
let defaultDescriptor = {
configurable: true,
enumerable,
set: MANDATORY_SETTER_FUNCTION(keyName),
get: DEFAULT_GETTER_FUNCTION(keyName),
};
Object.defineProperty(obj, keyName, defaultDescriptor);
} else if (wasDescriptor || enumerable === false) {
Object.defineProperty(obj, keyName, {
configurable: true,
enumerable,
writable: true,
value,
});
} else {
obj[keyName] = data;
}
} else {
value = desc;
// fallback to ES5
Object.defineProperty(obj, keyName, desc);
}
// if key is being watched, override chains that
// were initialized with the prototype
if (watching) {
overrideChains(obj, keyName, meta);
}
// The `value` passed to the `didDefineProperty` hook is
// either the descriptor or data, whichever was passed.
if (typeof (obj as ExtendedObject).didDefineProperty === 'function') {
(obj as ExtendedObject).didDefineProperty!(obj, keyName, value);
}
}示例2: setup
setup(obj: object, key: string, meta: Meta) {
Object.defineProperty(obj, key, this.desc);
meta.writeDescriptors(key, this);
}