ESLint: fromEvent 已定义但从未使用 (no-unused-vars)

Question

import { Observable } from 'rxjs/Observable';
import { fromEvent } from 'rxjs/add/observable/fromEvent';
import { merge } from 'rxjs/add/observable/merge';

const touchstart = (input) => Observable.merge(
    Observable.fromEvent(input, 'pointerdown')
      .filter(event => event.pointerType === 'touch'),
    Observable.fromEvent(input, 'touchstart'));

我收到以下 linting 错误：ESLint: fromEvent is defined but never used (no-unused-vars)

和上一样merge。问题是我需要导入fromEvent，merge否则它不包含它们。

Answer 1

尝试只导入这些模块，而不将它们分配给任何东西：

import 'rxjs/add/observable/fromEvent';
import 'rxjs/add/observable/merge';