Update types exposed by Alert and the module structure (#49157)

Summary:

Changelog: [Internal]

Differential Revision: D69044715

Author: j-piasecki

packages/react-native/Libraries/Alert/Alert.flow.js

@@ -9,18 +9,61 @@
  */
 
 import type {DialogOptions} from '../NativeModules/specs/NativeDialogManagerAndroid';
-import type {AlertOptions, AlertType, Buttons} from './Alert.flow';
 
 import Platform from '../Utilities/Platform';
 import RCTAlertManager from './RCTAlertManager';
 
-export type * from './Alert.flow';
+/**
+ * @platform ios
+ */
+export type AlertType =
+  | 'default'
+  | 'plain-text'
+  | 'secure-text'
+  | 'login-password';
+
+/**
+ * @platform ios
+ */
+export type AlertButtonStyle = 'default' | 'cancel' | 'destructive';
+
+export type AlertButton = {
+  text?: string,
+  onPress?: ?((value?: string) => any) | ?Function,
+  isPreferred?: boolean,
+  style?: AlertButtonStyle,
+  ...
+};
+
+export type AlertButtons = Array<AlertButton>;
 
+export type AlertOptions = {
+  /** @platform android */
+  cancelable?: ?boolean,
+  userInterfaceStyle?: 'unspecified' | 'light' | 'dark',
+  /** @platform android */
+  onDismiss?: ?() => void,
+  ...
+};
+
+/**
+ * Launches an alert dialog with the specified title and message.
+ *
+ * Optionally provide a list of buttons. Tapping any button will fire the
+ * respective onPress callback and dismiss the alert. By default, the only
+ * button will be an 'OK' button.
+ *
+ * This is an API that works both on iOS and Android and can show static
+ * alerts. On iOS, you can show an alert that prompts the user to enter
+ * some information.
+ *
+ * See https://reactnative.dev/docs/alert
+ */
 class Alert {
   static alert(
     title: ?string,
     message?: ?string,
-    buttons?: Buttons,
+    buttons?: AlertButtons,
     options?: AlertOptions,
   ): void {
     if (Platform.OS === 'ios') {
@@ -53,7 +96,7 @@ class Alert {
       // At most three buttons (neutral, negative, positive). Ignore rest.
       // The text 'OK' should be probably localized. iOS Alert does that in native.
       const defaultPositiveText = 'OK';
-      const validButtons: Buttons = buttons
+      const validButtons: AlertButtons = buttons
         ? buttons.slice(0, 3)
         : [{text: defaultPositiveText}];
       const buttonPositive = validButtons.pop();
@@ -93,10 +136,13 @@ class Alert {
     }
   }
 
+  /**
+   * @platform ios
+   */
   static prompt(
     title: ?string,
     message?: ?string,
-    callbackOrButtons?: ?(((text: string) => void) | Buttons),
+    callbackOrButtons?: ?(((text: string) => void) | AlertButtons),
     type?: ?AlertType = 'plain-text',
     defaultValue?: string,
     keyboardType?: string,

packages/react-native/Libraries/Alert/Alert.js

@@ -53,7 +53,7 @@ declare export default typeof NativeActionSheetManager;
 "
 `;
 
-exports[`public API should not change unintentionally Libraries/Alert/Alert.flow.js 1`] = `
+exports[`public API should not change unintentionally Libraries/Alert/Alert.js 1`] = `
 "export type AlertType =
   | \\"default\\"
   | \\"plain-text\\"
@@ -67,7 +67,7 @@ export type AlertButton = {
   style?: AlertButtonStyle,
   ...
 };
-export type Buttons = Array<AlertButton>;
+export type AlertButtons = Array<AlertButton>;
 export type AlertOptions = {
   cancelable?: ?boolean,
   userInterfaceStyle?: \\"unspecified\\" | \\"light\\" | \\"dark\\",
@@ -78,36 +78,13 @@ declare class Alert {
   static alert(
     title: ?string,
     message?: ?string,
-    buttons?: Buttons,
+    buttons?: AlertButtons,
     options?: AlertOptions
   ): void;
   static prompt(
     title: ?string,
     message?: ?string,
-    callbackOrButtons?: ?(((text: string) => void) | Buttons),
-    type?: ?AlertType,
-    defaultValue?: string,
-    keyboardType?: string,
-    options?: AlertOptions
-  ): void;
-}
-declare export default typeof Alert;
-"
-`;
-
-exports[`public API should not change unintentionally Libraries/Alert/Alert.js 1`] = `
-"export type * from \\"./Alert.flow\\";
-declare class Alert {
-  static alert(
-    title: ?string,
-    message?: ?string,
-    buttons?: Buttons,
-    options?: AlertOptions
-  ): void;
-  static prompt(
-    title: ?string,
-    message?: ?string,
-    callbackOrButtons?: ?(((text: string) => void) | Buttons),
+    callbackOrButtons?: ?(((text: string) => void) | AlertButtons),
     type?: ?AlertType,
     defaultValue?: string,
     keyboardType?: string,
@@ -124,17 +101,6 @@ declare export default typeof NativeAlertManager;
 "
 `;
 
-exports[`public API should not change unintentionally Libraries/Alert/RCTAlertManager.flow.js 1`] = `
-"declare const RCTAlertManager: {
-  alertWithArgs(
-    args: Args,
-    callback: (id: number, value: string) => void
-  ): void,
-};
-declare export default typeof RCTAlertManager;
-"
-`;
-
 exports[`public API should not change unintentionally Libraries/Alert/RCTAlertManager.js.flow 1`] = `
 "declare export default {
   alertWithArgs(

packages/react-native/Libraries/Alert/RCTAlertManager.flow.js

@@ -21,11 +21,11 @@ const path = require('path');
 const {parseArgs} = require('util');
 
 const TYPES_DIR = 'types_generated';
-const IGNORE_PATTERN = '**/__{tests,mocks,fixtures}__/**';
+const IGNORE_PATTERN = '**/__{tests,mocks,fixtures,flowtests}__/**';
 
 const SOURCE_PATTERNS = [
   // Start with Animated only
-  'react-native/Libraries/Alert/**/*.js',
+  'react-native/Libraries/Alert/**/*.{js,flow}',
   'react-native/Libraries/ActionSheetIOS/**/*.js',
   'react-native/Libraries/TurboModule/RCTExport.js',
   'react-native/Libraries/Types/RootTagTypes.js',
@@ -115,7 +115,7 @@ function getBuildPath(file /*: string */) /*: string */ {
     packageDir,
     file
       .replace(packageDir, TYPES_DIR)
-      .replace(/\.flow\.js$/, '.js')
+      .replace(/\.js\.flow$/, '.js')
       .replace(/\.js$/, '.d.ts'),
   );
 }
@@ -126,15 +126,15 @@ function ignoreShadowedFiles(files /*: Array<string> */) /*: Array<string> */ {
 
   // Find all flow definition files that shadow other files
   for (const file of files) {
-    if (/\.flow\.js$/.test(file)) {
+    if (/\.js\.flow$/.test(file)) {
       shadowedPrefixes[file.substring(0, file.length - 8)] = true;
     }
   }
 
   // Filter out all files shadowed by flow definition files
   for (const file of files) {
     const prefix = file.split('.')[0];
-    if (/\.flow\.js$/.test(file) || !shadowedPrefixes[prefix]) {
+    if (/\.js\.flow$/.test(file) || !shadowedPrefixes[prefix]) {
       result.push(file);
     }
   }