fix: Revert Web Vite Config Breaking changes

[stevensJourney]

Overview

Some changes introduced in #753
unintentionally caused breakages for consumers using Vite’s development build process.

That refactor externalised event-iterator and buffer for non-Node.js builds of @powersync/common. As a result, Vite dev servers can fail with errors such as:

The requested module '/@fs/private/tmp/example-vite/node_modules/buffer/index.js?v=7f9815bf' does not provide an export named 'Buffer'

and

SyntaxError: The requested module '/@fs/private/tmp/example-vite/node_modules/event-iterator/lib/dom.js?v=9b401c16' does not provide an export named 'EventIterator'

While consumers can work around this by updating their Vite configs, requiring manual configuration changes is potentially a breaking change. For example:

optimizeDeps: {
  // Don't optimize these packages as they contain web workers and WASM files.
  // https://github.com/vitejs/vite/issues/11672#issuecomment-1415820673
  exclude: ["@journeyapps/wa-sqlite", "@powersync/web"],
  include: [
+    "@powersync/web > event-iterator",
  ],
},
plugins: [wasm(), topLevelAwait()],
worker: {
  format: "es",
  plugins: () => [wasm(), topLevelAwait()],
},
+resolve: {
+  alias: {
+    buffer: "buffer",
+  },
+},

This PR reverts the externalisation to prevent consumers from running into these issues.

This problem didn’t surface within the monorepo because of how our package structure behaves during local development. To prevent regressions going forward, the isolated tests have been expanded to include Vite unit tests for the example-vite demo. These tests run against a real Vite dev server and will fail with the same errors if the configuration becomes invalid again.

[changeset-bot]

🦋 Changeset detected

Latest commit: 63f5a38

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 8 packages

Name	Type
@powersync/common	Minor
@powersync/react-native	Minor
@powersync/web	Minor
@powersync/adapter-sql-js	Patch
@powersync/node	Patch
@powersync/op-sqlite	Patch
@powersync/tanstack-react-query	Patch
@powersync/diagnostics-app	Patch

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