我正在使用Sapper运行sapper export，它会生成静态文件。我试过了：
在其自己的文件中创建firebase实例，然后导出firebase.auth()和firebase.firestore()模块。
尝试调整rollup.config.js以解决不同的依赖关系，如以下错误消息所建议。这带来了更多的头痛。
在中创建Firebase实例client.js。不成功。
在中创建实例stores.js。不成功。
声明变量并将其分配给onMount()。这使我不得不在不同的块范围内工作。而且感觉有点。
应用程序的初始化工作正常：
import firebase from 'firebase/app'
const config = {...}
firebase.initializeApp(config);
import firebase from 'firebase'，则不会出现此服务器错误：import firebase from 'firebase/app'
const config = {...}
firebase.initializeApp(config);
我希望只从文件中导出这些firebase功能并将它们导入到我的组件中，例如：
@firebase/app:
Warning: This is a browser-targeted Firebase bundle but it appears it is being run in a Node environment. If running in a Node environment, make sure you are using the bundle specified by the "main" field in package.json.
If you are using Webpack, you can specify "main" as the first item in
"resolve.mainFields": https://webpack.js.org/configuration/resolve/#resolvemainfields
If using Rollup, use the rollup-plugin-node-resolve plugin and set "module" to false and "main" to true: https://github.com/rollup/rollup-plugin-node-resolve
但是，一旦包含该导入，开发服务器就会崩溃。我不想在服务器上使用它，因为我只是生成静态文件。
是否有人对如何仅在客户端实现导入有任何想法？
Tia*_*ega 11
我能够使用 ES6 导入 firebase。如果你使用 rollup，你需要在 commonjs 插件中配置 namedExports：
//--- rollup.config.js ---
...
commonjs({
namedExports: {
// left-hand side can be an absolute path, a path
// relative to the current directory, or the name
// of a module in node_modules
'node_modules/idb/build/idb.js': ['openDb'],
'node_modules/firebase/dist/index.cjs.js': ['initializeApp', 'firestore'],
},
}),
你可以像这样使用它：
//--- db.js ---
import * as firebase from 'firebase';
import 'firebase/database';
import { firebaseConfig } from '../config'; //<-- Firebase initialization config json
// Initialize Firebase
firebase.initializeApp(firebaseConfig);
export { firebase };
// Initialize db
export const db = firebase.firestore();
也许在这样的服务中使用它：
// --- userService.js ----
import { db } from './common';
const usersCol = db.collection('users');
export default {
async login(username, password) {
const userDoc = await usersCol.doc(username).get();
const user = userDoc.data();
if (user && user.password === password) {
return user;
}
return null;
},
};
编辑 完整汇总配置
/* eslint-disable global-require */
import resolve from 'rollup-plugin-node-resolve';
import replace from 'rollup-plugin-replace';
import commonjs from 'rollup-plugin-commonjs';
import svelte from 'rollup-plugin-svelte';
import babel from 'rollup-plugin-babel';
import { terser } from 'rollup-plugin-terser';
import config from 'sapper/config/rollup';
import { sass } from 'svelte-preprocess-sass';
import pkg from './package.json';
const mode = process.env.NODE_ENV;
const dev = mode === 'development';
const legacy = !!process.env.SAPPER_LEGACY_BUILD;
// eslint-disable-next-line no-shadow
const onwarn = (warning, onwarn) =>
(warning.code === 'CIRCULAR_DEPENDENCY' && warning.message.includes('/@sapper/')) || onwarn(warning);
export default {
client: {
input: config.client.input(),
output: config.client.output(),
plugins: [
replace({
'process.browser': true,
'process.env.NODE_ENV': JSON.stringify(mode),
}),
svelte({
dev,
hydratable: true,
emitCss: true,
preprocess: {
style: sass(),
},
}),
resolve({
browser: true,
}),
commonjs({
namedExports: {
// left-hand side can be an absolute path, a path
// relative to the current directory, or the name
// of a module in node_modules
'node_modules/idb/build/idb.js': ['openDb'],
'node_modules/firebase/dist/index.cjs.js': ['initializeApp', 'firestore'],
},
}),
legacy &&
babel({
extensions: ['.js', '.mjs', '.html', '.svelte'],
runtimeHelpers: true,
exclude: ['node_modules/@babel/**'],
presets: [
[
'@babel/preset-env',
{
targets: '> 0.25%, not dead',
},
],
],
plugins: [
'@babel/plugin-syntax-dynamic-import',
[
'@babel/plugin-transform-runtime',
{
useESModules: true,
},
],
],
}),
!dev &&
terser({
module: true,
}),
],
onwarn,
},
server: {
input: config.server.input(),
output: config.server.output(),
plugins: [
replace({
'process.browser': false,
'process.env.NODE_ENV': JSON.stringify(mode),
}),
svelte({
generate: 'ssr',
dev,
}),
resolve(),
commonjs(),
],
external: Object.keys(pkg.dependencies).concat(require('module').builtinModules || Object.keys(process.binding('natives'))),
onwarn,
},
serviceworker: {
input: config.serviceworker.input(),
output: config.serviceworker.output(),
plugins: [
resolve(),
replace({
'process.browser': true,
'process.env.NODE_ENV': JSON.stringify(mode),
}),
commonjs(),
!dev && terser(),
],
onwarn,
},
};
所以我花了太多时间在这上面。确实没有比onMOunt更好的解决方案。
但是，我的确意识到必须使用Sapper的SSR功能。我写了一篇有关如何使用Sapper SSR和Cloud Functions在Firebase上进行设置的文章：
https://dev.to/eckhardtd/how-to-host-a-sapper-js-ssr-app-on-firebase-hmb
原始问题的另一个解决方案是通过src/template.html文件将Firebase CDN放在全局范围内。
<body>
<!-- The application will be rendered inside this element,
because `app/client.js` references it -->
<div id='sapper'>%sapper.html%</div>
<!-- Sapper creates a <script> tag containing `app/client.js`
and anything else it needs to hydrate the app and
initialise the router -->
%sapper.scripts%
<!-- Insert these scripts at the bottom of the HTML, but before you use any Firebase services -->
<!-- Firebase App (the core Firebase SDK) is always required and must be listed first -->
<script src="https://www.gstatic.com/firebasejs/6.0.4/firebase-app.js"></script>
<!-- Add Firebase products that you want to use -->
<script src="https://www.gstatic.com/firebasejs/6.0.4/firebase-auth.js"></script>
<script src="https://www.gstatic.com/firebasejs/6.0.4/firebase-firestore.js"></script>
</body>
</html>
并在组件中：
<script>
import { onMount } from 'svelte';
let database, authentication;
onMount(() => {
database = firebase.firestore();
authentication = firebase.auth();
});
const authHandler = () => {
if (process.browser) {
authentication
.createUserWithEmailAndPassword()
.catch(e => console.error(e));
}
}
</script>
<button on:click={authHandler}>Sign up</button>