feat: add dynamic button text to the prompt

examples/SimpleExample/Gemfile.lock

@@ -0,0 +1,116 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    CFPropertyList (3.0.7)
+      base64
+      nkf
+      rexml
+    activesupport (6.1.7.10)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+      zeitwerk (~> 2.3)
+    addressable (2.8.7)
+      public_suffix (>= 2.0.2, < 7.0)
+    algoliasearch (1.27.5)
+      httpclient (~> 2.8, >= 2.8.3)
+      json (>= 1.5.1)
+    atomos (0.1.3)
+    base64 (0.3.0)
+    benchmark (0.5.0)
+    bigdecimal (3.3.1)
+    claide (1.1.0)
+    cocoapods (1.15.2)
+      addressable (~> 2.8)
+      claide (>= 1.0.2, < 2.0)
+      cocoapods-core (= 1.15.2)
+      cocoapods-deintegrate (>= 1.0.3, < 2.0)
+      cocoapods-downloader (>= 2.1, < 3.0)
+      cocoapods-plugins (>= 1.0.0, < 2.0)
+      cocoapods-search (>= 1.0.0, < 2.0)
+      cocoapods-trunk (>= 1.6.0, < 2.0)
+      cocoapods-try (>= 1.1.0, < 2.0)
+      colored2 (~> 3.1)
+      escape (~> 0.0.4)
+      fourflusher (>= 2.3.0, < 3.0)
+      gh_inspector (~> 1.0)
+      molinillo (~> 0.8.0)
+      nap (~> 1.0)
+      ruby-macho (>= 2.3.0, < 3.0)
+      xcodeproj (>= 1.23.0, < 2.0)
+    cocoapods-core (1.15.2)
+      activesupport (>= 5.0, < 8)
+      addressable (~> 2.8)
+      algoliasearch (~> 1.0)
+      concurrent-ruby (~> 1.1)
+      fuzzy_match (~> 2.0.4)
+      nap (~> 1.0)
+      netrc (~> 0.11)
+      public_suffix (~> 4.0)
+      typhoeus (~> 1.0)
+    cocoapods-deintegrate (1.0.5)
+    cocoapods-downloader (2.1)
+    cocoapods-plugins (1.0.0)
+      nap
+    cocoapods-search (1.0.1)
+    cocoapods-trunk (1.6.0)
+      nap (>= 0.8, < 2.0)
+      netrc (~> 0.11)
+    cocoapods-try (1.2.0)
+    colored2 (3.1.2)
+    concurrent-ruby (1.3.3)
+    escape (0.0.4)
+    ethon (0.15.0)
+      ffi (>= 1.15.0)
+    ffi (1.17.2)
+    fourflusher (2.3.1)
+    fuzzy_match (2.0.4)
+    gh_inspector (1.1.3)
+    httpclient (2.9.0)
+      mutex_m
+    i18n (1.14.7)
+      concurrent-ruby (~> 1.0)
+    json (2.7.6)
+    logger (1.7.0)
+    minitest (5.25.4)
+    molinillo (0.8.0)
+    mutex_m (0.3.0)
+    nanaimo (0.3.0)
+    nap (1.1.0)
+    netrc (0.11.0)
+    nkf (0.2.0)
+    public_suffix (4.0.7)
+    rexml (3.4.4)
+    ruby-macho (2.5.1)
+    typhoeus (1.5.0)
+      ethon (>= 0.9.0, < 0.16.0)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    xcodeproj (1.25.1)
+      CFPropertyList (>= 2.3.3, < 4.0)
+      atomos (~> 0.1.3)
+      claide (>= 1.0.2, < 2.0)
+      colored2 (~> 3.1)
+      nanaimo (~> 0.3.0)
+      rexml (>= 3.3.6, < 4.0)
+    zeitwerk (2.6.18)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  activesupport (>= 6.1.7.5, != 7.1.0)
+  benchmark
+  bigdecimal
+  cocoapods (>= 1.13, != 1.15.1, != 1.15.0)
+  concurrent-ruby (< 1.3.4)
+  logger
+  mutex_m
+  xcodeproj (< 1.26.0)
+
+RUBY VERSION
+   ruby 2.6.10p210
+
+BUNDLED WITH
+   1.17.2

examples/SimpleExample/ios/Podfile.lock

@@ -2389,7 +2389,7 @@ DEPENDENCIES:
   - React-logger (from `../node_modules/react-native/ReactCommon/logger`)
   - React-Mapbuffer (from `../node_modules/react-native/ReactCommon`)
   - React-microtasksnativemodule (from `../node_modules/react-native/ReactCommon/react/nativemodule/microtasks`)
-  - react-native-encrypted-storage (from `../../../node_modules/react-native-encrypted-storage`)
+  - react-native-encrypted-storage (from `../node_modules/react-native-encrypted-storage`)
   - react-native-safe-area-context (from `../node_modules/react-native-safe-area-context`)
   - react-native-webview (from `../node_modules/react-native-webview`)
   - React-NativeModulesApple (from `../node_modules/react-native/ReactCommon/react/nativemodule/core/platform/ios`)
@@ -2512,7 +2512,7 @@ EXTERNAL SOURCES:
   React-microtasksnativemodule:
     :path: "../node_modules/react-native/ReactCommon/react/nativemodule/microtasks"
   react-native-encrypted-storage:
-    :path: "../../../node_modules/react-native-encrypted-storage"
+    :path: "../node_modules/react-native-encrypted-storage"
   react-native-safe-area-context:
     :path: "../node_modules/react-native-safe-area-context"
   react-native-webview:
@@ -2588,75 +2588,75 @@ SPEC CHECKSUMS:
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   glog: 5683914934d5b6e4240e497e0f4a3b42d1854183
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+  RCT-Folly: 59ec0ac1f2f39672a0c6e6cecdd39383b764646f
   RCTDeprecation: c4b9e2fd0ab200e3af72b013ed6113187c607077
   RCTRequired: e97dd5dafc1db8094e63bc5031e0371f092ae92a
   RCTTypeSafety: 720403058b7c1380c6a3ae5706981d6362962c89
   React: f1486d005993b0af01943af1850d3d4f3b597545
   React-callinvoker: 133f69368c8559e744efa345223625d412f5dfbe
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-  React-cxxreact: 9cb9fa738274a1b36b97ede09c8a6717dec1a20b
+  React-Core: d6d8c1fd33697cec596d33b820456505ee305686
+  React-CoreModules: 81ab751a7668ba161440f9623b994e1a6a3019fe
+  React-cxxreact: 16f2a2751d0dce8b569f23c1914edc90f655b01b
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-  Yoga: 11c9686a21e2cd82a094a723649d9f4507200fb0
+  Yoga: fa23995c18b65978347b096d0836f4f5093df545
 
 PODFILE CHECKSUM: caa3b1c0eb720af4b5b95ccf1991b4f988d100f0
 
-COCOAPODS: 1.16.2
+COCOAPODS: 1.15.2

src/components/Prompt/Button.tsx

@@ -18,6 +18,30 @@ interface Props {
   survey?: Survey;
 }
 
+const calculateLuminance = (hexColor: string): number => {
+  // Remove # if present
+  const hex = hexColor.replace('#', '');
+
+  // Convert hex to RGB (0-255)
+  const r = parseInt(hex.substring(0, 2), 16);
+  const g = parseInt(hex.substring(2, 4), 16);
+  const b = parseInt(hex.substring(4, 6), 16);
+
+  // Linearize sRGB values (gamma correction) per WCAG spec
+  const linearize = (channel: number): number => {
+    const c = channel / 255;
+    return c <= 0.03928 ? c / 12.92 : Math.pow((c + 0.055) / 1.055, 2.4);
+  };
+
+  const rLinear = linearize(r);
+  const gLinear = linearize(g);
+  const bLinear = linearize(b);
+
+  // Calculate relative luminance using WCAG formula
+  // https://www.w3.org/TR/WCAG20/#relativeluminancedef
+  return 0.2126 * rLinear + 0.7152 * gLinear + 0.0722 * bLinear;
+};
+
 const PromptButton: (Props: Props) => React.ReactElement = ({
   color,
   colorDark,
@@ -26,23 +50,24 @@ const PromptButton: (Props: Props) => React.ReactElement = ({
   survey,
 }) => {
   let backgroundColor;
-  let textColor;
 
   switch (survey?.appearance) {
     case Themes.Dark:
       backgroundColor = colorDark || color;
-      textColor = Colors.Black;
       break;
     case Themes.Light:
       backgroundColor = color;
-      textColor = Colors.White;
       break;
     default:
-      Appearance.getColorScheme() === Themes.Dark
-        ? ((backgroundColor = colorDark || color), (textColor = Colors.Black))
-        : ((backgroundColor = color), (textColor = Colors.White));
+      backgroundColor =
+        Appearance.getColorScheme() === Themes.Dark
+          ? colorDark || color
+          : color;
   }
 
+  const luminance = calculateLuminance(backgroundColor);
+  const textColor = luminance < 0.5 ? Colors.White : Colors.Black;
+
   return (
     <View>
       <TouchableHighlight