使用 Webpacker 和 Rails 导入 npm 包的图像

Question

我正在尝试使用 yarn 和 webpacker 安装软件包 lightslider。

这是我目前所做的：

yarn add lightslider

// app/webpacker/packs/application.js

require('lightslider');

// app/webpacker/src/application.scss

@import '~lightslider/dist/css/lightslider.min';

但是，由于以下错误，Webpack 编译失败：

Module not found: Error: Can't resolve '../img/controls.png'

这是lightslider正常工作需要的图片，位于node_modules/lightslider/dist/img/controls.png:

// node_modules/lightslider/dist/css/lightslider.css

.lSAction > a {
    width: 32px;
    display: block;
    top: 50%;
    height: 32px;
    background-image: url('../img/controls.png');
    cursor: pointer;
    position: absolute;
    z-index: 99;
    margin-top: -16px;
    opacity: 0.5;
    -webkit-transition: opacity 0.35s linear 0s;
    transition: opacity 0.35s linear 0s;
}

如何将此图像导入我的包中以便 lightslider 找到它？

Answer 1

来自 WebpackER 文档：https://github.com/rails/webpacker/blob/76b491750993fada8b0b0cc2546dfcfbc4aaae13/docs/css.md#resolve-url-loader

Since Sass/libsass does not provide url rewriting, all linked assets must be relative to the output. Add the missing url rewriting using the resolve-url-loader. Place it directly after the sass-loader in the loader chain.

// webpack/environment.js
const { environment } = require('@rails/webpacker')

// resolve-url-loader must be used before sass-loader
environment.loaders.get('sass').use.splice(-1, 0, {
  loader: 'resolve-url-loader'
});

我能够 reproduce/fix 您描述的问题 without/with 使用 @rails/webpacker@4.0.7 和 resolve-url-loader@3.1.0 进行上述修改。

使用 Webpacker 和 Rails 导入 npm 包的图像

Import images of an npm package with Webpacker and Rails

ruby-on-rails

npm

webpack

yarnpkg

webpacker