我正在尝试使用this SO answer中使用ComponentMetadata
的代码。看起来它曾经是角度/核心,但我想它已经不再可用了?
这是代码。我该怎么做才能在最后一行中使用metadata
?
function ExtendComponent(annotation: any) {
return function (target: Function) {
var parentTarget = Object.getPrototypeOf(target.prototype).constructor;
var parentAnnotations = Reflect.getMetadata('annotations', parentTarget);
var parentAnnotation = parentAnnotations[0];
Object.keys(parentAnnotation).forEach(key => {
if (isPresent(parentAnnotation[key])) {
// verify is annotation typeof function
if(typeof annotation[key] === 'function'){
annotation[key] = annotation[key].call(this, parentAnnotation[key]);
}else if(
// force override in annotation base
!isPresent(annotation[key])
){
annotation[key] = parentAnnotation[key];
}
}
});
var metadata = new ComponentMetadata(annotation);
Reflect.defineMetadata('annotations', [ metadata ], target);
}
}
我真的在黑暗中拍摄,但我在角度来源中找到了这个测试,使用了MetadataCollector
。
import { MetadataCollector } from '@angular/tsc-wrapped';
...
const collector = new MetadataCollector({quotedNames: true});
...
const metadata = collector.getMetadata(source);
const componentMetadata = metadata.metadata['MyComponent'];
这甚至可以替代吗?我试着检查一下,但在new MetadataCollector({quotedNames: true})
我得到了
Supplied parameters do not match any signature of call target.
即使我尝试new MetadataCollector()
,我也会收到此累积警告并且捆绑更新失败错误:
rollup: Treating 'fs' as external dependency
bundle update failed: Error transforming .../node_modules/typescript/lib/typescript.js
with 'commonjs' plugin: The keyword 'package' is reserved (57066:28) in .../node_modules/typescript/lib/typescript.js
答案 0 :(得分:4)
由于不推荐使用ComponentMetadata,我们需要使用
var metadata = new Component(annotation);