Fix normalization of degrees in AnimatedInterpolation (facebook#36645)

Summary:
Pull Request resolved: facebook#36645

This broke while changing the AnimatedInterpolation back in D40571873 and D40632443, as I assumed the native side would be able to correctly handle values such as '1rad'. However these were being sent over as strings, and were thus using the string interpolation path, which does not work here.

Instead, handle both `deg` and `rad` explicitly when generating the config in JS.

Resolves issue facebook#36608

Changelog: [General][Fixed] Resolves Animated.Value.interpolate results in NaN when output is in radians

Reviewed By: yungsters

Differential Revision: D44406034

fbshipit-source-id: ea0eec9421b91d200024371696d4d2406a4f8767

packages/react-native/Libraries/Animated/NativeAnimatedHelper.js

@@ -562,10 +562,13 @@ function transformDataType(value: number | string): number | string {
   if (typeof value !== 'string') {
     return value;
   }
-  if (/deg$/.test(value)) {
+
+  // Normalize degrees and radians to a number expressed in radians
+  if (value.endsWith('deg')) {
     const degrees = parseFloat(value) || 0;
-    const radians = (degrees * Math.PI) / 180.0;
-    return radians;
+    return (degrees * Math.PI) / 180.0;
+  } else if (value.endsWith('rad')) {
+    return parseFloat(value) || 0;
   } else {
     return value;
   }

packages/react-native/Libraries/Animated/__tests__/Interpolation-test.js

@@ -349,4 +349,20 @@ describe('Interpolation', () => {
     expect(interpolation(1e-12)).toBe('rgba(0, 0, 0, 0)');
     expect(interpolation(2 / 3)).toBe('rgba(0, 0, 0, 0.667)');
   });
+
+  it.each([
+    ['radians', ['1rad', '2rad'], [1, 2]],
+    ['degrees', ['90deg', '180deg'], [Math.PI / 2, Math.PI]],
+    ['numbers', [1024, Math.PI], [1024, Math.PI]],
+    ['unknown', ['5foo', '10foo'], ['5foo', '10foo']],
+  ])(
+    'should convert %s to numbers in the native config',
+    (_, outputRange, expected) => {
+      const config = new AnimatedInterpolation(
+        {},
+        {inputRange: [0, 1], outputRange},
+      ).__getNativeConfig();
+      expect(config.outputRange).toEqual(expected);
+    },
+  );
 });