Added PGLite example [skip ci]

Author: ankane

README.md

@@ -38,6 +38,7 @@ Or check out some examples:
 - [Morgan fingerprints](examples/rdkit/example.js) with RDKit.js
 - [Recommendations](examples/disco/example.js) with Disco
 - [Horizontal scaling](examples/citus/example.js) with Citus
+- [WebAssembly](examples/pglite/example.js) with PGLite
 - [Bulk loading](examples/loading/example.js) with `COPY`
 
 ## node-postgres

examples/pglite/example.js

@@ -0,0 +1,12 @@
+import { PGlite } from '@electric-sql/pglite';
+import { vector } from '@electric-sql/pglite/vector';
+
+const db = new PGlite({extensions: {vector}});
+
+await db.query('CREATE EXTENSION IF NOT EXISTS vector');
+await db.query('CREATE TABLE items (id bigserial PRIMARY KEY, embedding vector(3))');
+await db.query("INSERT INTO items (embedding) VALUES ('[1,2,3]'), ('[4,5,6]')");
+await db.query('CREATE INDEX ON items USING hnsw (embedding vector_l2_ops)');
+
+const { rows } = await db.query("SELECT * FROM items ORDER BY embedding <-> '[3,1,2]' LIMIT 5");
+console.log(rows);

examples/pglite/package.json

@@ -0,0 +1,7 @@
+{
+    "private": true,
+    "type": "module",
+    "dependencies": {
+        "@electric-sql/pglite": "^0.2.0"
+    }
+}