build(replay): Stop preserving modules (getsentry#6817)

Stop preserving JS modules when transpiling the Replay package. With this change, everything is bundled into one `index.js` file (similarly to CDN bundles) which avoids weird bundler/plugin errors that emerge because of our file structure inside our NPM package.

packages/replay/rollup.npm.config.js

@@ -1,5 +1,3 @@
-import path from 'path';
-
 import replace from '@rollup/plugin-replace';
 
 import { makeBaseNPMConfig, makeNPMConfigVariants } from '../../rollup/index';
@@ -23,12 +21,7 @@ export default makeNPMConfigVariants(
         // set exports to 'named' or 'auto' so that rollup doesn't warn about
         // the default export in `worker/worker.js`
         exports: 'named',
-
-        // As we are inlining the rrweb dependency here, we need to ensure the nested folders are correct
-        // Without this config, you get:
-        // * build/npm/esm/node_modules/rrweb/...
-        // * build/npm/esm/packages/replay/...
-        preserveModulesRoot: path.join(process.cwd(), 'src'),
+        preserveModules: false,
       },
     },
   }),

rollup/npmHelpers.js

@@ -95,12 +95,6 @@ export function makeBaseNPMConfig(options = {}) {
       ...Object.keys(packageDotJSON.dependencies || {}),
       ...Object.keys(packageDotJSON.peerDependencies || {}),
     ],
-
-    // TODO `'smallest'` will get rid of `isDebugBuild()` by evaluating it and inlining the result and then treeshaking
-    // from there. The current setting (false) prevents this, in case we want to leave it there for users to use in
-    // their own bundling. That said, we don't yet know for sure that that works, so come back to this.
-    // treeshake: 'smallest',
-    treeshake: false,
   };
 
   return deepMerge(defaultBaseConfig, packageSpecificConfig, {