Validate build

src/core/session.ts

 import { SpeedyMedia } from 'speedy-vision/types/core/speedy-media';
 import { SpeedyMediaSourceNativeElement } from 'speedy-vision/types/core/speedy-media-source';
 import { SpeedyPromise } from 'speedy-vision/types/core/speedy-promise';
+import { AR } from '../main';
 import { Nullable, Utils } from '../utils/utils';
 import { AREvent, AREventTarget } from '../utils/ar-events';
-import { IllegalArgumentError, IllegalOperationError, NotSupportedError } from '../utils/errors';
+import { IllegalArgumentError, IllegalOperationError, NotSupportedError, AccessDeniedError } from '../utils/errors';
 import { Viewport } from './viewport';
 import { Settings } from './settings';
 import { Stats } from './stats';
             if(mode !== 'inline' && Session.count > 0)
                 throw new IllegalOperationError(`Can't start more than one immersive session`);
 
+            // dev build? work-in-progress
+            const isStableBuild = /^\d+\.\d+(\.\d+)*$/.test(AR.version);
+            if(!isStableBuild) {
+                if(!(['localhost', '127.0.0.1', '[::1]', '', 'encantar.dev', 'alemart.github.io'].includes(location.hostname))) {
+                    if(!(location.hostname.startsWith('192.168.') || location.hostname.startsWith('10.') || /^172\.(1[6-9]|2[0-9]|3[01])\./.test(location.hostname))) {
+                        const message = 'This is a development build (unstable). Do not use it in production.';
+                        Utils.warning(message);
+                        if(!confirm(message + '\n\nAre you sure you want to continue?'))
+                            throw new AccessDeniedError('Aborted');
+                    }
+                }
+            }
+
             // initialize matrix routines
             return Speedy.Matrix.ready();