import { PipeTransform, Pipe } from '@angular/core';
import { CurrencyPipe } from '@angular/common';

/**
 * 内置 `_currency` 货币格式化
 * 简化原 `currency` 针对中文货币格式化问题
 * 别忘记在根模块中注册语言环境：
 *
 * ```typescript
 * import { registerLocaleData } from '@angular/common';
 * import localeZhHans from '@angular/common/locales/zh-Hans';
 * registerLocaleData(localeZhHans);
 * ```
 */
@Pipe({ name: '_currency' })
export class CNCurrencyPipe extends CurrencyPipe implements PipeTransform {
    transform(
        value: any,
        currencyCode: string = '￥',
        display: 'code' | 'symbol' | 'symbol-narrow' | boolean = 'code',
        digits?: string): string | null {
        return super.transform(value, currencyCode, <any>display, digits);
    }
}