Fix normalization of degrees in AnimatedInterpolation

Summary:
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

Differential Revision: D44406034

fbshipit-source-id: ea95f557d594a1f55bedd7c5e3a95ef36bc68ff2

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

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