为组件 AppComponent 指定的模板不是字符串 [英] The template specified for component AppComponent is not a string

问题描述

免责声明:是的，我看到有更多为组件 AppComponent 指定的模板不是字符串"相关问题，但没有一个描述我遇到的具体问题.

当我在 ng build 中不使用 AoT 进行编译时出现此运行时错误:

未捕获的错误:为组件 AppComponent 指定的模板不是字符串

这个错误实际上是有道理的，因为在生成的捆绑代码(main.ts)中我看到:

template: __webpack_require__(/*!raw-loader!./app.component.html */"../node_modules/raw-loader/dist/cjs.js!../Scripts/app/app.component.html"),

在一个新的 Angular 应用程序中，我看到:

模板:__webpack_require__(/*!./app.component.html */"./src/app/app.component.html")

以某种方式将 raw-loader 作为加载器添加到我的 .html 文件中.

现在也许重要的是要提到我正在将我的 webpack 4 AngularJs 项目迁移到 Angular 8.但是当我调试我的 webpack 构建时，我看不到它的 test 包含 .html 的规则 和一个 loader. 包含 raw-loader.

加载器规则调试图

所以我的加载器规则不会影响这个添加到 app.component.html 的原始加载器

app.component.ts:

import { Component } from '@angular/core';@成分({选择器:'app-root'，templateUrl: './app.component.html',styleUrls: ['./app.component.scss']})导出类 AppComponent {}

app.component.html:

我将不胜感激，谢谢.

解决方案

将 raw-loader 从 2.0.0 降级到 1.0.0 修复了这个问题.

首先我从 angular 源代码中了解到，他们默认在 从 Angular 8 开始.然后它稍后在这里.

raw-loader 2.0.0 生成:

/***/"../node_modules/raw-loader/dist/cjs.js!../Scripts/app/app.component.html":/******************************************************************************************！*\!*** ../node_modules/raw-loader/dist/cjs.js!../Scripts/app/app.component.html ***！\************************************************************************************//*!提供的出口:默认 *//***/(功能(模块，__webpack_exports__，__webpack_require__){严格使用"；__webpack_require__.r(__webpack_exports__);/* 和谐默认导出 */__webpack_exports__["default"] = ("<div>\r\n app 组件工作！\r\n</div>\r\n");/***/}),

而 raw-loader 1.0.0 生成:

/***/"../node_modules/raw-loader/index.js!../Scripts/app/app.component.html":/******************************************************************************！*\!*** ../node_modules/raw-loader!../Scripts/app/app.component.html ***！\***********************************************************************//*!没有找到静态导出 *//***/(功能(模块，出口){module.exports = "
\r\n 应用组件有效！\r\n
\r\n"/***/}),

哪个好.Angular 需要在这里将 module.exports 设为字符串.

disclaimer: Yes, I saw that there are more "The template specified for component AppComponent is not a string" related questions but none of them describes the specific problem I'm experiencing.

I get this runtime error when I compile without AoT in ng build:

Uncaught Error: The template specified for component AppComponent is not a string

This error actually make sense because in the generated bundled code (main.ts) I see:

template: __webpack_require__(/*! raw-loader!./app.component.html */ "../node_modules/raw-loader/dist/cjs.js!../Scripts/app/app.component.html"),

while in a new Angular app I see:

template: __webpack_require__(/*! ./app.component.html */ "./src/app/app.component.html")

Somehow the raw-loader gets added as a loader to my .html files.

Now maybe it's important to mention that i'm migrating my webpack 4 AngularJs project to Angular 8. BUT When I debug my webpack build I see no rule that its test contains .html and a loader. that contains raw-loader.

Debug picture of loader rules

So my loaders rules doesn't affect this raw-loader addition to app.component.html

app.component.ts:

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent {
}

app.component.html:

 <div></div>

I'll appreciate any help, thanks.

解决方案

Downgrading raw-loader from 2.0.0 to 1.0.0 fixed this issue.

First I learned from angular source code that they added raw-loader to templateUrl by default in here since Angular 8. Then it's later used in here.

raw-loader 2.0.0 generated:

/***/ "../node_modules/raw-loader/dist/cjs.js!../Scripts/app/app.component.html":
/*!********************************************************************************!*\
  !*** ../node_modules/raw-loader/dist/cjs.js!../Scripts/app/app.component.html ***!
  \********************************************************************************/
/*! exports provided: default */
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony default export */ __webpack_exports__["default"] = ("<div>\r\n    app componenets works!\r\n</div>\r\n");

/***/ }),

And raw-loader 1.0.0 generates:

    /***/ "../node_modules/raw-loader/index.js!../Scripts/app/app.component.html":
/*!********************************************************************!*\
  !*** ../node_modules/raw-loader!../Scripts/app/app.component.html ***!
  \********************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

module.exports = "<div>\r\n    app componenets works!\r\n</div>\r\n"

/***/ }),

which is good. Angular needs module.exports to be string here.

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