如何将 Material UI 集成到 Svelte 项目中

我想整合材质用户界面 https://sveltematerialui.com/进入我的 Svelte 项目。

我尝试遵循官方文档here https://github.com/hperrin/svelte-material-ui，但我不知道为什么在尝试运行我的项目时遇到奇怪的错误：

loaded rollup.config.js with warnings
(!) Unused external imports
default imported from external module 'rollup-plugin-postcss' but never used
rollup v1.27.13
bundles src/main.js → public/build/bundle.js...
[!] Error: Unexpected token (Note that you need plugins to import files that are not JavaScript)
src/views/App.css (1:0)
1: .footer.svelte-1xl6ht0{position:fixed;left:0;bottom:0;width:100%;background-color:#569e3e;color:white;text-align:center;height:15px}.footer.us.svelte-1xl6ht0,.footer.europe.svelte-1xl6ht0,.footer.central.svelte-1xl6ht0,.footer.south.svelte-1xl6ht0,.footer.apac.svelte-1xl6ht0,.footer.baldr.svelte-1xl6ht0{background-color:#ca4a4a}.footer
....

问题似乎与 CSS 有关。

In my src目录 我有一个名为theme其中包含一个名为_smui-theme.scss这是文件的内容：

@import "@material/theme/color-palette";

// Svelte Colors!
$mdc-theme-primary: #ff3e00;
$mdc-theme-secondary: #676778;
// Other Svelte color: #40b3ff

$mdc-theme-background: #fff;
$mdc-theme-surface: #fff;

$mdc-theme-error: $material-color-red-900;

这是我的rollup.config.json file:

import svelte from 'rollup-plugin-svelte';
import resolve from 'rollup-plugin-node-resolve';
import commonjs from 'rollup-plugin-commonjs';
import livereload from 'rollup-plugin-livereload';
import { terser } from 'rollup-plugin-terser';
import json from '@rollup/plugin-json';

const production = !process.env.ROLLUP_WATCH;

export default {
    input: 'src/main.js',
    output: {
        sourcemap: true,
        format: 'iife',
        name: 'app',
        file: 'public/build/bundle.js',
    },
    plugins: [
        json(),
        svelte({
            // Enables run-time checks when not in production.
            dev: !production,

            // Extracts any component CSS out into a separate file — better for performance.
            css: css => css.write('public/build/bundle.css'),

            // Emit CSS as "files" for other plugins to process
            emitCss: true,
        }),

        resolve({
            browser: true,
            dedupe: importee => importee === 'svelte' || importee.startsWith('svelte/')
        }),
        commonjs(),

        // In dev mode, call `npm run start` once the bundle has been generated
        !production && serve(),

        // Watches the `public` directory and refresh the browser on changes when not in production.
        !production && livereload('public'),

        // Minify for production.
        production && terser()
    ],
    watch: {
        clearScreen: false
    }
};

function serve() {
    let started = false;

    return {
        writeBundle() {
            if (!started) {
                started = true;

                require('child_process').spawn('npm', ['run', 'start', '--', '--dev'], {
                    stdio: ['ignore', 'inherit', 'inherit'],
                    shell: true
                });
            }
        }
    };
}

为了解决这个问题postcss汇总需要插件。
我还添加了一个精简的预处理器（我认为这是可选的，但我想确定一下）。

确保安装此软件包npm or yarn:

rollup-plugin-postcss and svelte-preprocess

然后插件应该被添加到rollup.config.js像这样：

import svelte from 'rollup-plugin-svelte';
import resolve from 'rollup-plugin-node-resolve';
import commonjs from 'rollup-plugin-commonjs';
import livereload from 'rollup-plugin-livereload';
import { terser } from 'rollup-plugin-terser';
import postcss from 'rollup-plugin-postcss';      <<<------------- Add this
import autoPreprocess from 'svelte-preprocess';   <<<------------- Add this
import json from '@rollup/plugin-json';

const production = !process.env.ROLLUP_WATCH;

export default {
    input: 'src/main.js',
    output: {
        sourcemap: true,
        format: 'iife',
        name: 'app',
        file: 'public/build/bundle.js',
    },
    plugins: [
        json(),
        svelte({
            // Enables run-time checks when not in production.
            dev: !production,

            // Extracts any component CSS out into a separate file — better for performance.
            css: css => css.write('public/build/bundle.css'),

            // Emit CSS as "files" for other plugins to process
            emitCss: true,

            preprocess: autoPreprocess()          <<<------------- Add this
        }),

        resolve({
            browser: true,
            dedupe: importee => importee === 'svelte' || importee.startsWith('svelte/')
        }),
        commonjs(),

        postcss({                               <<<------------- Add this
            extract: true,
            minimize: true,
            use: [
                ['sass', {
                includePaths: [
                    './src/theme',
                    './node_modules'
                ]
                }]
            ]
        }),

        // In dev mode, call `npm run start` once the bundle has been generated
        !production && serve(),

        // Watches the `public` directory and refresh the browser on changes when not in production.
        !production && livereload('public'),

        // Minify for production.
        production && terser()
    ],
    watch: {
        clearScreen: false
    }
};

function serve() {
    let started = false;

    return {
        writeBundle() {
            if (!started) {
                started = true;

                require('child_process').spawn('npm', ['run', 'start', '--', '--dev'], {
                    stdio: ['ignore', 'inherit', 'inherit'],
                    shell: true
                });
            }
        }
    };
}

现在一切都应该与 css 一起正常工作，并且可以使用 Material UI。