Add additional ESLint rules

.eslintrc.js

@@ -69,12 +69,23 @@ module.exports = {
     'react-native/no-color-literals': 'off',
     'react-native/no-raw-text': 'off',
     'react-native/no-single-element-style-arrays': 'warn',
+    '@typescript-eslint/strict-boolean-expressions': [
+      'error',
+      {
+        allowString: false,
+        allowNullableObject: false,
+        allowNumber: false,
+        allowNullableBoolean: true,
+      },
+    ],
+    '@typescript-eslint/no-non-null-assertion': 'error',
+    '@typescript-eslint/no-unnecessary-condition': 'error',
 
     // react hooks
     'react-hooks/exhaustive-deps': [
       'error',
       {
-        additionalHooks: '(useDerivedValue|useAnimatedStyle|useAnimatedProps|useWorkletCallback)',
+        additionalHooks: '(useDerivedValue|useAnimatedStyle|useAnimatedProps|useWorkletCallback|useFrameProcessor)',
       },
     ],
   },

example/src/views/CaptureButton.tsx

@@ -76,6 +76,7 @@ const _CaptureButton: React.FC<Props> = ({
       // If we're on Android and flash is disabled, we can use the "snapshot" method.
       // this will take a snapshot of the current SurfaceView, which results in faster image
       // capture rate at the cost of greatly reduced quality.
+      // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
       const photoMethod = USE_SNAPSHOT_ON_ANDROID && IS_ANDROID && takePhotoOptions.flash === 'off' ? 'snapshot' : 'photo';
       console.log(`Taking ${photoMethod}...`);
       const photo =

ios/CameraView.swift

@@ -103,6 +103,7 @@ public final class CameraView: UIView {
     // swiftlint:disable force_cast
     return layer as! AVCaptureVideoPreviewLayer
   }
+
   override public class var layerClass: AnyClass {
     return AVCaptureVideoPreviewLayer.self
   }

src/Camera.tsx

@@ -357,8 +357,6 @@ export class Camera extends React.PureComponent<CameraProps, CameraState> {
 
   //#region Events (Wrapped to maintain reference equality)
   private onError(event: NativeSyntheticEvent<OnErrorEvent>): void {
-    if (event == null) throw new Error('onError() was invoked but event was null!');
-
     if (this.props.onError != null) {
       const error = event.nativeEvent;
       const cause = isErrorWithCause(error.cause) ? error.cause : undefined;

src/CameraError.ts

@@ -116,7 +116,7 @@ class CameraError<TCode extends CameraErrorCode> extends Error {
    * @internal
    */
   constructor(code: TCode, message: string, cause?: ErrorWithCause) {
-    super(`[${code}]: ${message}${cause ? ` (Cause: ${cause.message})` : ''}`);
+    super(`[${code}]: ${message}${cause != null ? ` (Cause: ${cause.message})` : ''}`);
     this._code = code;
     this._message = message;
     this._cause = cause;