Add spec on Javascript side

Author: sidorchukandrew

src/specs/NativeModuleMaterialRangePicker.js

@@ -0,0 +1,34 @@
+// @flow strict-local
+
+import type {TurboModule} from 'react-native/Libraries/TurboModule/RCTExport';
+import {TurboModuleRegistry} from 'react-native';
+
+export type RangePickerOpenParams = $ReadOnly<{
+  dialogButtons?: $ReadOnly<{string: string}>,
+  initialInputMode?: string,
+  title?: string,
+  maximumDate?: number,
+  minimumDate?: number,
+  startTimestamp?: number,
+  endTimestamp?: number,
+  testID?: string,
+  timeZoneName?: number,
+  timeZoneOffsetInMinutes?: number,
+}>;
+
+type RangeSetAction = 'rangeSetAction' | 'dismissedAction';
+type RangePickerResult = $ReadOnly<{
+  action: RangeSetAction,
+  startTimestamp: number,
+  endTimestamp: number,
+  utcOffset: number,
+}>;
+
+export interface Spec extends TurboModule {
+  +dismiss: () => Promise<boolean>;
+  +open: (params: RangePickerOpenParams) => Promise<RangePickerResult>;
+}
+
+export default (TurboModuleRegistry.getEnforcing<Spec>(
+  'RNCMaterialRangePicker',
+): ?Spec);