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