Question

在Ionic中，我在执行以下命令时遇到问题：

离子cordova build ios --prod

之后，在＆＃34; ngc开始＆＃34;将显示以下消息：

TypeError: Cannot read property 'assertNoMembers' of null
at AotSummaryResolver.resolveSummary (/dir/node_modules/@angular/compiler/bundles/compiler.umd.js:31986:21)
at CompileMetadataResolver._loadSummary (/dir/node_modules/@angular/compiler/bundles/compiler.umd.js:14710:66)
at CompileMetadataResolver._getEntryComponentMetadata (/dir/node_modules/@angular/compiler/bundles/compiler.umd.js:15742:66)
at /dir/node_modules/@angular/compiler/bundles/compiler.umd.js:14904:76
at Array.map (native)
at CompileMetadataResolver.getNonNormalizedDirectiveMetadata (/dir/node_modules/@angular/compiler/bundles/compiler.umd.js:14904:22)
at /dir/node_modules/@angular/compiler/bundles/compiler.umd.js:29359:88
at Array.forEach (native)
at AotCompiler.findGeneratedFileNames (/dir/node_modules/@angular/compiler/bundles/compiler.umd.js:29358:25)
at Object.findGeneratedFileNames (/dir/node_modules/@angular/compiler-cli/src/transformers/program.js:392:82)

命令没有＆＃34; - prod＆＃34;工作良好。另外＆＃34;离子服务＆＃34;工作正常

Answer 1

今天早上我遇到了同样的错误，对我来说问题是我的模块中有这样的错误：

@NgModule({
  imports: [...],
  declarations: [...],
  entryComponents: components.filter(x => x.entryComponent)],
})

entryComponents应该是一个类型数组，以便编译器可以在编译时解析它。改变它来解决问题：

@NgModule({
  imports: [...],
  declarations: [...],
  entryComponents: [MyComponent],
})

注意：如果您在使用ng服务时遇到此问题，则更改文件时会出现错误，并且角度会重新编译您的项目。

Answer 2

我有Simon's problem的变体。修正案的扩展名相同。

// sidenavs is an object with keys and values, and values() is a lodash method that extracts only the values, which are components in this case
const mySidenavs = values(sidenavs)

@NgModule({
   imports: [...],
   declarations: [...],
   entryComponents: [
    // Spread operator breaks
    ...mySidenavs
   ]
})

只需导入每个单独修复的AOT版本。

@NgModule({
   imports: [...],
   declarations: [...],
   entryComponents: [
      Sidenav1,
      ...
      SidenavN
   ]
})

TypeError：无法读取属性＆＃39; assertNoMembers＆＃39;为null

2 个答案: