feat: named error when Stream API not supported

Author: gruhn

src/misc/camera.js

@@ -1,3 +1,4 @@
+import { StreamApiNotSupportedError } from './errors.js'
 import { imageDataFromVideo } from './image-data.js'
 import { hasFired } from './promisify.js'
 
@@ -22,7 +23,7 @@ class Camera {
 
 export default async function (constraints, videoEl) {
   if (!(navigator.mediaDevices && navigator.mediaDevices.getUserMedia)) {
-    throw new Error('WebRTC API not supported in this browser')
+    throw new StreamApiNotSupportedError()
   }
 
   const stream = await navigator.mediaDevices.getUserMedia(constraints)

src/misc/errors.js

@@ -14,3 +14,11 @@ export class DropImageDecodeError extends Error {
     this.name = 'DropImageDecodeError'
   }
 }
+
+export class StreamApiNotSupportedError extends Error {
+  constructor () {
+    super('this browser has no Stream API support')
+
+    this.name = 'StreamApiNotSupportedError'
+  }
+}