未捕获的TypeError:svmd_es.Button不是在svelte中实现UI工具包的构造函数

问题描述

我是svelte的新手,并且在我的第一个实验中试用了Material Design工具包。我发现https://github.com/hkh12/svmd看起来不错,然后将其添加到我的svelte项目中。

根据文档,除了导入组件和使用它们外,没有其他内容。但是,这在浏览器中给了我以下错误

Uncaught TypeError: svmd_es.Button is not a constructor
    create_fragment bundle.js:798
    init index.mjs:1451
    App bundle.js:873
    app main.js:4
    <anonymous> bundle.js:890

在Node svmd模块文件夹中,我发现这些组件本身就是.svelte文件;格式为.svelte,也可以是已编译的格式。我不知道为什么简单地导入它们并使用它们是行不通的。

我唯一想到的就是我的汇总文件中可能缺少什么?也许首先需要翻译一些东西,或者应该(不是)对node_modules文件夹中的.svelte文件进行预处理(或者不进行预处理)?

要尝试解决此问题,我已经尝试过:

  • 在汇总中的resolve配置中添加苗条
  • 将svmd节点文件夹的路径添加到汇总中的svelte include配置中

两个都不起作用。这是我现在使用的文件

main.js

import App from './App.svelte';

const app = new App({
    target: document.body
});

export default app;

App.svelte

<script>
    import { Button,Slider,Fab } from 'svmd';
    import 'svmd/dist/svmd.css';
</script>

<main>
    <Button>flat button</Button>
    Lets see a button.
</main>

<style>
</style>

Rollup.config.js

import svelte from 'rollup-plugin-svelte';
import scss from 'rollup-plugin-scss';
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';

const production = !process.env.ROLLUP_WATCH;

function serve() {
    let server;
    
    function toExit() {
        if (server) server.kill(0);
    }

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

            process.on('SIGTERM',toExit);
            process.on('exit',toExit);
        }
    };
}

export default {
    input: 'src/main.js',output: {
        sourcemap: true,format: 'iife',name: 'app',file: 'public/build/bundle.js'
    },plugins: [
        svelte({
            // enable run-time checks when not in production
            dev: !production,// we'll extract any component CSS out into
            // a separate file - better for performance
            css: css => {
                css.write('public/build/bundle.css');
            }
        }),// If you have external dependencies installed from
        // npm,you'll most likely need these plugins. In
        // some cases you'll need additional configuration -
        // consult the documentation for details:
        // https://github.com/rollup/plugins/tree/master/packages/commonjs
        scss(),resolve({
            browser: true,dedupe: ['svelte']
        }),commonjs(),// In dev mode,call `npm run start` once
        // the bundle has been generated
        !production && serve(),// Watch the `public` directory and refresh the
        // browser on changes when not in production
        !production && livereload('public'),// If we're building for production (npm run build
        // instead of npm run dev),minify
        production && terser()
    ],watch: {
        clearScreen: false
    }
};

package.json

{
  "name": "svelteapp","version": "1.0.0","scripts": {
    "build": "rollup -c","dev": "rollup -c -w","start": "sirv public"
  },"devDependencies": {
    "@rollup/plugin-commonjs": "^14.0.0","@rollup/plugin-node-resolve": "^8.4.0","rollup": "^2.3.4","rollup-plugin-livereload": "^1.0.0","rollup-plugin-scss": "^2.6.0","rollup-plugin-svelte": "^5.0.3","rollup-plugin-terser": "^7.0.0","svelte": "^3.0.0","svmd": "^0.3.1"
  },"dependencies": {
    "sirv-cli": "^1.0.0"
  }
}

希望有人可以帮助我。

解决方法

您提到的库似乎在捆绑发布时出现了一些错误。如果直接引用源组件本身,那么运气会更好

import { Button,Slider,Fab } from 'svmd/src';

也就是说,它似乎不再活跃了。

如果您要进行材质设计,则可能需要看看https://sveltematerialui.com/