added test for issue 1470

Author: georgiy.rusanov

.github/workflows/ci.yml

@@ -87,6 +87,9 @@ jobs:
       - name: Run Unit Tests + Coverage
         run: npm run test:coverage
 
+      - name: Run isows Compatibility Test
+        run: npm run test:isows-compatibility
+
       - name: Upload coverage results to Coveralls
         uses: coverallsapp/github-action@v2
         with:

package.json

@@ -36,6 +36,7 @@
     "test:integration": "jest --runInBand --detectOpenHandles test/integration.test.ts",
     "test:integration:browser": "deno test --allow-all test/integration.browser.test.ts",
     "test:edge-functions": "deno test --allow-all --no-check test/deno/edge-functions-integration.test.ts",
+    "test:isows-compatibility": "jest --runInBand --detectOpenHandles test/isowsAbsentsCompatibility.test.ts",
     "test:watch": "jest --watch --verbose false --silent false",
     "test:node:playwright": "cd test/integration/node-browser && npm install && cp ../../../dist/umd/supabase.js . && npm run test",
     "test:bun": "cd test/integration/bun && bun install && bun test",

test/isowsAbsentsCompatibility.test.ts

@@ -0,0 +1,79 @@
+import * as fs from 'fs'
+import * as path from 'path'
+
+// Simulates isows removal (like in server environments)
+function simulateIsowsRemoval(): { backupPath: string; originalPath: string } {
+  const originalPath = path.join(__dirname, '..', 'node_modules', 'isows')
+  const backupPath = path.join(__dirname, '..', 'node_modules', 'isows_backup')
+
+  try {
+    if (fs.existsSync(originalPath)) {
+      fs.renameSync(originalPath, backupPath)
+      console.log('📦 isows temporarily removed (server environment simulation)')
+    }
+  } catch (error) {
+    console.log('⚠️  Failed to remove isows:', (error as Error).message)
+  }
+
+  return { backupPath, originalPath }
+}
+
+// Restores isows
+function restoreIsows(backupPath: string, originalPath: string): void {
+  try {
+    if (fs.existsSync(backupPath)) {
+      fs.renameSync(backupPath, originalPath)
+      console.log('📦 isows restored')
+    }
+  } catch (error) {
+    console.log('⚠️  Failed to restore isows:', (error as Error).message)
+  }
+}
+
+function testIsowsAvailability(): boolean {
+  try {
+    require('isows')
+    return true
+  } catch {
+    console.log('isows is not available')
+    return false
+  }
+}
+
+function testRealtimeClientCreation(): boolean {
+  try {
+    const { RealtimeClient } = require('@supabase/realtime-js')
+    new RealtimeClient('ws://localhost:54321/realtime/v1')
+    return true
+  } catch {
+    console.log('realtime client is not available')
+    return false
+  }
+}
+
+/**
+ * Jest test for isows compatibility
+ */
+
+describe('isows compatibility', () => {
+  let backupPath: string
+  let originalPath: string
+
+  beforeEach(() => {
+    ;({ backupPath, originalPath } = simulateIsowsRemoval())
+    console.log('backupPath', backupPath)
+    console.log('originalPath', originalPath)
+  })
+
+  afterEach(() => {
+    restoreIsows(backupPath, originalPath)
+  })
+
+  it('should work without isows dependency', () => {
+    const isowsAvailable = testIsowsAvailability()
+    const isRealtimeClientWorks = testRealtimeClientCreation()
+
+    expect(isowsAvailable).toBe(false)
+    expect(isRealtimeClientWorks).toBe(true) // should be true because realtime-js doesn't use isows
+  })
+})