PouchDB 和 SvelteKit

Question

I want to use PouchDB with SvelteKit.我想将 PouchDB 与 SvelteKit 一起使用。 I have copied pouchdb-7.2.1.js to /src/lib d in SvelteKit and renamed it to pouchdb.js.我已将 pouchdb-7.2.1.js 复制到 SvelteKit 中的/src/lib d 并将其重命名为 pouchdb.js。 Pouchdb should run in the browser. Pouchdb 应该在浏览器中运行。 Therefore I have used ssr=false to suppress server side rendering.因此我使用 ssr=false 来抑制服务器端渲染。 I get the first error at the import statement.我在导入语句中收到第一个错误。 This is my first very short page (couchdb.svelte):这是我的第一个非常短的页面（couchdb.svelte）：

<script context="module">
    export const ssr = false;
</script>

<script>
    import PouchDB from '$lib/pouchdb.js'; 
</script>

I get an error 500我收到错误 500

import not found: PouchDB

I have tried a lot of diffent version without any success.我尝试了很多不同的版本，但都没有成功。 For example:例如：

import PouchDB from 'pouchdb-browser';  (After npm i pouchdb-browser)
import PouchDB from 'pouchdb';          (After npm i pouchdb)

What is the correct way to use pouchdb?使用 pouchdb 的正确方法是什么？

Answer 1

Here is a work-around that uses PouchDB via a script tag:这是通过脚本标签使用 PouchDB 的解决方法：

index.svelte: index.svelte：

<script>
    import { onMount } from 'svelte'

    // Ensure execution only on the browser, after the pouchdb script has loaded.
    onMount(async function() {
        var db = new PouchDB('my_database');
        console.log({PouchDB})
        console.log({db})
    });
</script>


<svelte:head>
    <script src="//cdn.jsdelivr.net/npm/pouchdb@7.2.1/dist/pouchdb.min.js"></script>
</svelte:head>

When import ed, PouchDB seems to expect a certain environment that Svelte/Vite/Rollup does not provide.当import ed 时，PouchDB 似乎期望 Svelte/Vite/Rollup 不提供的某个环境。 (Svelte/Vite is happiest with proper ESM modules; PouchDB seems to be a "window.global" script that was converted to a JS module.) （Svelte/Vite 对正确的 ESM 模块最满意；PouchDB 似乎是一个转换为 JS 模块的“window.global”脚本。）

There may be a way to modify the configuration to create the environment expected by PouchDB.可能有一种方法可以修改配置以创建 PouchDB 期望的环境。 I think you would have to modify the svelte.config.cjs file.我认为您必须修改svelte.config.cjs文件。 (Specifically the vite section that determines the rollup configuration. ) （特别是决定rollup 配置的vite部分。）

You might find some hints in this related issue for PouchDB + Angular .您可能会在PouchDB + Angular 的相关问题中找到一些提示。

I would just use the <script> work-around above.我只会使用上面的<script>解决方法。

Answer 2

For future googlers trying to integrate pouchdb-browser and/or RxDB with sveltekit here are the changes to "fix" the enviornment for pouchdb in the browser when using vite.对于未来尝试将pouchdb-browser和/或RxDB与 sveltekit 集成的谷歌用户，这里是使用 vite 时“修复”浏览器中 pouchdb 环境的更改。

Add to your <head> section before %svelte.head%在%svelte.head%之前添加到您的<head>部分

<script>
    window.process = window.process || {env: {NODE_DEBUG:undefined, DEBUG:undefined}};
    window.global = window;
</script>

In svelte.config.js add the optimizeDeps to config.kit.vite.optimizeDeps在svelte.config.js中将optimizeDeps添加到config.kit.vite.optimizeDeps

optimizeDeps: {
    allowNodeBuiltins: ['pouchdb-browser', 'pouchdb-utils', 'base64id', 'mime-types']
}

Here is a commit that makes these changes to my app: https://github.com/TechplexEngineer/bionic-scouting/commit/d1c4a4dcdc7096ae40937501d97a7ef9ee10ab66这是对我的应用程序进行这些更改的提交： https://github.com/TechplexEngineer/bionic-scouting/commit/d1c4a4dcdc7096ae40937501d97a7ef9ee10ab66

Thanks to: pouchdb/pouchdb#8266 (comment)感谢： pouchdb/pouchdb#8266（评论）

Answer 3

I have been battling this very same problem for a while.我一直在与同样的问题作斗争一段时间。 I decided to go a different route.我决定 go 一条不同的路线。 This may not be right, but it is working.这可能不正确，但它正在工作。

I added two scripts to my app.html head:我在 app.html 头中添加了两个脚本：

<head>
    <meta charset="utf-8" />
    <meta name="description" content="" />
    <link rel="icon" href="%svelte.assets%/favicon.png" />
    <meta name="viewport" content="width=device-width, initial- 
    scale=1" />
    <!-- Call the Pouchdb import -->
    <script type="text/javascript" src="../src/lib/pouchdb.js">
    </script>
    <!-- create new databases for use in the app -->
    <script>
        const user = new PouchDB('user');
    </script>
    %svelte.head%
</head>

Then in any component that I want to use the database, I add an additional script tag to define the variable "user":然后在我想使用数据库的任何组件中，我添加一个额外的脚本标签来定义变量“user”：

<script lang="ts" context="module">
    //Declare the database name so that it is recognized.
    declare const user;
</script>

<script lang="ts">
//Example use of database.
const addUser = () => {
    //Call the database by name established in app.html
    user.put({
        _id: 'someid',
        firstName: 'Jon',
        lastName: 'doe'
    });
};
</script>

That has been the easiest method for me to employ PouchDB with SvelteKit.这对我来说是使用 PouchDB 和 SvelteKit 最简单的方法。 Every other solution required significant modifications to configuration files, changes to environment variables, and unnecessary adaptations of code throughout the application.所有其他解决方案都需要对配置文件进行重大修改、更改环境变量以及在整个应用程序中对代码进行不必要的调整。 I hope this helps.我希望这有帮助。

PouchDB 和 SvelteKit

问题描述

3 个解决方案

解决方案1
5 已采纳 2021-04-26 23:46:55

解决方案2
0 2021-12-18 04:11:00

解决方案3
0 2022-02-04 06:09:48

PouchDB 和 SvelteKit

问题描述

3 个解决方案

解决方案1 5 已采纳 2021-04-26 23:46:55

解决方案2 0 2021-12-18 04:11:00

解决方案3 0 2022-02-04 06:09:48

解决方案1
5 已采纳 2021-04-26 23:46:55

解决方案2
0 2021-12-18 04:11:00

解决方案3
0 2022-02-04 06:09:48