fix: detect Node via process.type to keep Electron main process working (#1033)

* fix: detect Node via process.type, not process.versions.electron

The Electron guard added in #951 (!process.versions.electron) also
disabled the Node code path in the Electron main and utility processes,
which are real Node environments that need it. process.versions.electron
is set in every Electron process, not just the renderer.

Key off process.type instead: exclude only Electron's web contexts
('renderer', 'worker', 'service-worker'), keeping the Node path for the
main ('browser') and utility processes, and for plain Node (no
process.type). Fixes the renderer crash from #813 without regressing
PGlite in the Electron main process.

Refs #951, #813

* refactor: extract isElectronWebContext helper, trim comment

Address review feedback on #1033: move the Electron/Node detection out of the
IN_NODE expression into a small named helper and trim the explanatory comment
from 9 lines to 3. Behavior is unchanged.

Author: claygeo

.changeset/electron-main-process-in-node.md

@@ -0,0 +1,5 @@
+---
+'@electric-sql/pglite': patch
+---
+
+Detect the Node environment via `process.type` instead of `process.versions.electron`. The previous Electron guard (#951) also treated the Electron main and utility processes as non-Node, which broke PGlite's filesystem code path there. `process.type` only excludes Electron's web contexts (renderer, web worker, service worker), so PGlite keeps using the Node.js path in the Electron main and utility processes. Follow-up to #951 / #813.

packages/pglite-utils/src/utils.ts

@@ -1,8 +1,16 @@
+// Electron exposes a Node-like `process` in its renderer/worker/service-worker
+// contexts, which must use the browser fs path. Its main and utility processes
+// are real Node environments (#813).
+function isElectronWebContext(): boolean {
+  const type = (process as { type?: string }).type
+  return type === 'renderer' || type === 'worker' || type === 'service-worker'
+}
+
 export const IN_NODE =
   typeof process === 'object' &&
   typeof process.versions === 'object' &&
   typeof process.versions.node === 'string' &&
-  !process.versions.electron
+  !isElectronWebContext()
 
 export const WASM_PREFIX = '/pglite'