ts-metadata-helper

An implementation of wrapper ES7 reflect metadata at TypeScript 2.0.

Features

Compatible with the Angular 2.0.0 annotations.

Dependencies

• core-js

Installation

First you need to install the npm module:

npm install ts-metadata-helper --save

Use

import {Input, Output, Component} from '@angular/core';
import {PropertyAnnotationFactory, IAnnotation, MetadataHelper} from 'ts-metadata-helper/index';
 
...
 
class ViewFieldMetadata {
    configValue:number;
 
    constructor(config) {
        this.configValue = config.configValue;
    }
}
 
const ViewField:IAnnotation = PropertyAnnotationFactory(ViewFieldMetadata);
 
@Component({
    template: '<div>Template</div>'
})
class View {
    @ViewField({configValue: 100})
    private field1:string;
 
    @ViewField({configValue: 200})
    private field2:number;
 
    @Input()
    private field3:number;
 
    @Input()
    private field4:number;
 
    @Output()
    private field5:number;
}
 
const viewInstance:View = new View();
 
expect(Object.keys(MetadataHelper.findPropertyMetadata(viewInstance, ViewField))).toEqual(['field1', 'field2']);
expect(Object.keys(MetadataHelper.findPropertyMetadata(viewInstance, Input))).toEqual(['field3', 'field4']);
expect(Object.keys(MetadataHelper.findPropertyMetadata(viewInstance, Output))).toEqual(['field5']);
 
const annotationMetadataHolder:IAnnotationMetadataHolder = MetadataHelper.findPropertyMetadata(viewInstance, ViewField);
expect(Reflect.get(Reflect.get(annotationMetadataHolder, 'field1'), 'configValue')).toBe(100);
expect(Reflect.get(Reflect.get(annotationMetadataHolder, 'field2'), 'configValue')).toBe(200);
 
expect(
    Reflect.get(MetadataHelper.findAnnotationsMetaData(View, Component)[0], 'template')
).toEqual('<div>Template</div>');

Publish

npm run deploy

License

Licensed under MIT.