Transferring css to an external file within an angular 4 component by utilizing webpack

I encountered this specific error message:

Error: Anticipated 'styles' to be a collection of strings.

Despite the fact that I have clearly defined the styles as an array of strings:

styleUrls: ['./app.component.css']

Can anyone pinpoint what mistake I might be making?

app.component.ts

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

@Component({
  selector: 'my-app',
  template: `<h2 class="float-left">Hey</h2>`,
  styleUrls: ['./app.component.css']
})
export class AppComponent { }

app.component.css

.float-left {
  float: left;
}

Excerpt from webpack.common.js

module: {
  rules: [{
    test: /\.ts$/,
    loaders: ['awesome-typescript-loader', 'angular2-template-loader']
  },
  {
    test: /\.html$/,
    loader: 'html-loader'
  },
  {
    test: /\.css$/,
    loader: 'css-loader'
  }]
},

Answer №1

Although I haven't personally faced this issue myself, I came across a previous discussion thread that might provide some insight into resolving your problem.

https://github.com/webpack-contrib/style-loader/issues/456

The most recommended solution that caught my attention was:

{ test: /\.scss$/, loaders: ['style-loader', 'css-loader'] }

Further down the thread, there are other suggestions and solutions that could potentially help you fix your issue.

It's worth mentioning that the use of angular-cli may or may not affect the resolution process. If you are using it, make sure to follow their webpack guidelines as they have specific requirements compared to a non-angular-cli setup.

Answer №2

For proper CSS loading, make sure to use style-loader after css-loader.

test: /\.css$/,
use: [{loader: 'css-loader'},{loader: 'style-loader'}]

The loaders in the "use" array execute in reverse order, starting with the last one and ending with the first one. This means that css-loader processes the CSS first, then style-loader embeds the styles into the page.

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