Angular compiler报的一个错误消息：Component XX is not part of any NgModule
Error in /turbo_modules/@angular/[email protected]/bundles/compiler.umd.js (29363:23)
Component ProductListComponent is not part of any NgModule or the module has not been imported into your module.
错误分析
app.module.ts里，只import了ProductListComponent，但却未申明到declarations区域内：
添加之后错误消失：
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