Create a new umd folder alongside dist for output of UMD files with a plain .js instead of .cjs extension, as the latter won't be served with the correct mime type by jsdelivr

 - rrweb-io#1687 (just rename `.cjs` to `.js`) was rejected due to the the 'dual package hazard' [1], and produces a warning when run through publint.dev (which was the original motivation for changing to \.cjs)
 - jsdelivr won't be serving `.cjs` with the correct mime type: jsdelivr/jsdelivr#18584

[1] https://nodejs.org/en/learn/modules/publishing-a-package#the-dual-package-hazard

Author: eoghanmurray

guide.md

@@ -15,13 +15,13 @@ You are recommended to install rrweb via jsdelivr's CDN service:
   rel="stylesheet"
   href="https://cdn.jsdelivr.net/npm/rrweb@latest/dist/style.css"
 />
-<script src="https://cdn.jsdelivr.net/npm/rrweb@latest/dist/rrweb.umd.min.cjs"></script>
+<script src="https://cdn.jsdelivr.net/npm/rrweb@latest/umd/rrweb.min.js"></script>
 ```
 
 Also, you can link to a specific version number that you can update manually:
 
 ```html
-<script src="https://cdn.jsdelivr.net/npm/rrweb@2.0.0-alpha.14/dist/rrweb.umd.min.cjs"></script>
+<script src="https://cdn.jsdelivr.net/npm/rrweb@2.0.0-alpha.14/umd/rrweb.min.js"></script>
 ```
 
 #### Only include the recorder code
@@ -30,7 +30,7 @@ rrweb's code includes both the record and the replay parts. Most of the time you
 This also can be done by using the `@rrweb/record` package and the CDN service:
 
 ```html
-<script src="https://cdn.jsdelivr.net/npm/@rrweb/record@latest/dist/record.umd.min.cjs"></script>
+<script src="https://cdn.jsdelivr.net/npm/@rrweb/record@latest/umd/record.min.js"></script>
 ```
 
 #### Other packages

guide.zh_CN.md

@@ -13,21 +13,21 @@
   rel="stylesheet"
   href="https://cdn.jsdelivr.net/npm/rrweb@latest/dist/style.css"
 />
-<script src="https://cdn.jsdelivr.net/npm/rrweb@latest/dist/rrweb.umd.min.cjs"></script>
+<script src="https://cdn.jsdelivr.net/npm/rrweb@latest/umd/rrweb.min.js"></script>
 ```
 
 也可以在 URL 中指定具体的版本号，例如：
 
 ```html
-<script src="https://cdn.jsdelivr.net/npm/rrweb@2.0.0-alpha.14/dist/rrweb.umd.min.cjs"></script>
+<script src="https://cdn.jsdelivr.net/npm/rrweb@2.0.0-alpha.14/umd/rrweb.min.js"></script>
 ```
 
 #### 仅引入录制部分
 
 rrweb 代码分为录制和回放两部分，大多数时候用户在被录制的应用中只需要引入录制部分代码。同样可以通过使用 @rrweb/record 包和 CDN 服务来实现：
 
 ```html
-<script src="https://cdn.jsdelivr.net/npm/@rrweb/record@latest/dist/record.umd.min.cjs"></script>
+<script src="https://cdn.jsdelivr.net/npm/@rrweb/record@latest/umd/record.min.js"></script>
 ```
 
 #### 其他包

packages/rrweb-player/README.md

@@ -19,7 +19,7 @@ rrweb-player can also be included with `<script>`：
   rel="stylesheet"
   href="https://cdn.jsdelivr.net/npm/rrweb-player@latest/dist/style.css"
 />
-<script src="https://cdn.jsdelivr.net/npm/rrweb-player@latest/dist/index.umd.cjs"></script>
+<script src="https://cdn.jsdelivr.net/npm/rrweb-player@latest/umd/index.js"></script>
 ```
 
 Or installed by using NPM：

vite.config.default.ts

@@ -1,9 +1,9 @@
 /// <reference types="vite/client" />
 import dts from 'vite-plugin-dts';
-import { copyFileSync } from 'node:fs';
+import { copyFileSync, mkdirSync } from 'node:fs';
 import { defineConfig, LibraryOptions, LibraryFormats, Plugin } from 'vite';
 import { build, Format } from 'esbuild';
-import { resolve } from 'path';
+import { resolve, dirname } from 'path';
 import { umdWrapper } from 'esbuild-plugin-umd-wrapper';
 import * as fs from 'node:fs';
 import { visualizer } from 'rollup-plugin-visualizer';
@@ -51,22 +51,27 @@ function minifyAndUMDPlugin({
               outDir,
             });
           } else {
+            mkdirSync(dirname(outputFilePath).replace('/dist', '/umd'));
+            const outUmd = `${outputFilePath}.umd.cjs`;
             await buildFile({
               name,
               input: inputFilePath,
-              output: `${outputFilePath}.umd.cjs`,
+              output: outUmd,
               minify: false,
               isCss: false,
               outDir,
             });
+            copyFileSync(outUmd, `${outputFilePath.replace('/dist/', '/umd/')}.js`);
+            const outUmdMin = `${outputFilePath}.umd.min.cjs`;
             await buildFile({
               name,
               input: inputFilePath,
-              output: `${outputFilePath}.umd.min.cjs`,
+              output: outUmdMin,
               minify: true,
               isCss: false,
               outDir,
             });
+            copyFileSync(outUmdMin, `${outputFilePath.replace('/dist/', '/umd/')}.min.js`);
           }
         }
       }