ng serve --prod

lib项目中的example调试时要加上--prod参数，使得开发环境和生产环境保持一致

Please add a @NgModule annotation.

使用ng-packagr打包时export需要加上index

// previous
export * from './src'
// now
export * from './src/index'

在源代码中导入源代码文件时要指定文件名

// previous
import { Comp } from '../comp';
// now
import { Comp } from '../comp/comp.component';

since the query selector wasn't defined.

使用viewChild时加上forwardRef

// previous
@ViewChild(SelectComponent)
compSelect: SelectComponent;
// now
import { forwardRef } from '@angular/core';
@ViewChild(forwardRef(() => SelectComponent))
compSelect: SelectComponent;