initial commit for linux support

test/capture-support.test.ts

@@ -0,0 +1,66 @@
+import assert from 'node:assert/strict'
+import { readFile } from 'node:fs/promises'
+import { join } from 'node:path'
+import test from 'node:test'
+import { getCaptureBackendSupport, resolveNativeCaptureSupport } from '../src/preload/captureSupport'
+import type { NativeCaptureSupport, NativeSystemCaptureAPI } from '../src/types/nativeCapture'
+
+function createNativeSystemCaptureAPI(support: NativeCaptureSupport): NativeSystemCaptureAPI {
+  return {
+    getSupport: () => support,
+    listOutputDevices: () => [],
+    start: () => ({
+      sampleRate: 48000,
+      channelCount: 2,
+      deviceId: 'default',
+      deviceLabel: 'Default',
+    }),
+    stop: () => {},
+    drain: () => ({
+      chunks: [],
+      overwriteCount: 0,
+      queueDepth: 0,
+    }),
+    nowMilliseconds: () => 0,
+  }
+}
+
+test('getCaptureBackendSupport resolves Linux native support from the addon surface', () => {
+  const support = getCaptureBackendSupport('linux', {
+    macosCapture: createNativeSystemCaptureAPI({ available: false, reason: 'macOS only' }),
+    windowsCapture: createNativeSystemCaptureAPI({ available: false, reason: 'Windows only' }),
+    linuxCapture: createNativeSystemCaptureAPI({
+      available: false,
+      reason: 'PulseAudio connection failed.',
+    }),
+  })
+
+  assert.deepEqual(support, {
+    nativeBackend: {
+      kind: 'native-linux',
+      available: false,
+      reason: 'PulseAudio connection failed.',
+    },
+    deviceInput: {
+      kind: 'device-input',
+      available: true,
+      reason: null,
+    },
+  })
+})
+
+test('resolveNativeCaptureSupport returns a module-unavailable reason when the addon is missing', () => {
+  assert.deepEqual(resolveNativeCaptureSupport('linux', null), {
+    kind: 'native-linux',
+    available: false,
+    reason: 'Native capture module is not available in this build.',
+  })
+})
+
+test('preload no longer exposes desktop source capture APIs', async () => {
+  const preloadSource = await readFile(join(process.cwd(), 'src', 'preload', 'index.ts'), 'utf8')
+
+  assert.doesNotMatch(preloadSource, /getDesktopSources/)
+  assert.doesNotMatch(preloadSource, /capture:get-backend-support/)
+  assert.doesNotMatch(preloadSource, /audio:get-desktop-sources/)
+})