Fix some flow errors that appear

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There are some errors I noticed after upgrading my flow version.  I had them in my project, and they were also reported in #11655.  These errors were ignored on master, but I went through and fixed them so the static analysis will work still.

After these changes, I receive no errors using flow `0.60.1` on latest master, or using `0.59` in my local project (which does not have the requisite ignores included).

- init a new project
     `react-native init --version <path-to-repo> helloworld`
- add the flow binary
     `yarn add -D flow-bin`
- run flow
     `yarn flow`
- make sure there are no errors in the project.
     ```
     No errors!
     ✨  Done in 23.60s.
     ```

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[GENERAL][BUGFIX][./Libraries] - Fix up some flow definitions
Closes #17086

Differential Revision: D6509112

Pulled By: hramos

fbshipit-source-id: a61145b5306c666ab6510ccb9eea02d96f3decb3

Author: deecewan

Libraries/Animated/src/Easing.js

@@ -62,22 +62,14 @@ class Easing {
   /**
    * A stepping function, returns 1 for any positive value of `n`.
    */
-  /* $FlowFixMe(>=0.59.0 site=react_native_fb) This comment suppresses an error
-   * caught by Flow 0.59 which was not caught before. Most likely, this error
-   * is because an exported function parameter is missing an annotation.
-   * Without an annotation, these parameters are uncovered by Flow. */
-  static step0(n) {
+  static step0(n: number) {
     return n > 0 ? 1 : 0;
   }
 
   /**
    * A stepping function, returns 1 if `n` is greater than or equal to 1.
    */
-  /* $FlowFixMe(>=0.59.0 site=react_native_fb) This comment suppresses an error
-   * caught by Flow 0.59 which was not caught before. Most likely, this error
-   * is because an exported function parameter is missing an annotation.
-   * Without an annotation, these parameters are uncovered by Flow. */
-  static step1(n) {
+  static step1(n: number) {
     return n >= 1 ? 1 : 0;
   }
 
@@ -87,11 +79,7 @@ class Easing {
    *
    * http://cubic-bezier.com/#0,0,1,1
    */
-  /* $FlowFixMe(>=0.59.0 site=react_native_fb) This comment suppresses an error
-   * caught by Flow 0.59 which was not caught before. Most likely, this error
-   * is because an exported function parameter is missing an annotation.
-   * Without an annotation, these parameters are uncovered by Flow. */
-  static linear(t) {
+  static linear(t: number) {
     return t;
   }
 
@@ -114,11 +102,7 @@ class Easing {
    *
    * http://easings.net/#easeInQuad
    */
-  /* $FlowFixMe(>=0.59.0 site=react_native_fb) This comment suppresses an error
-   * caught by Flow 0.59 which was not caught before. Most likely, this error
-   * is because an exported function parameter is missing an annotation.
-   * Without an annotation, these parameters are uncovered by Flow. */
-  static quad(t) {
+  static quad(t: number) {
     return t * t;
   }
 
@@ -128,11 +112,7 @@ class Easing {
    *
    * http://easings.net/#easeInCubic
    */
-  /* $FlowFixMe(>=0.59.0 site=react_native_fb) This comment suppresses an error
-   * caught by Flow 0.59 which was not caught before. Most likely, this error
-   * is because an exported function parameter is missing an annotation.
-   * Without an annotation, these parameters are uncovered by Flow. */
-  static cubic(t) {
+  static cubic(t: number) {
     return t * t * t;
   }
 
@@ -142,29 +122,16 @@ class Easing {
    * n = 4: http://easings.net/#easeInQuart
    * n = 5: http://easings.net/#easeInQuint
    */
-  /* $FlowFixMe(>=0.59.0 site=react_native_fb) This comment suppresses an error
-   * caught by Flow 0.59 which was not caught before. Most likely, this error
-   * is because an exported function parameter is missing an annotation.
-   * Without an annotation, these parameters are uncovered by Flow. */
-  static poly(n) {
-    /* $FlowFixMe(>=0.59.0 site=react_native_fb) This comment suppresses an
-     * error caught by Flow 0.59 which was not caught before. Most likely, this
-     * error is because an exported function parameter is missing an
-     * annotation. Without an annotation, these parameters are uncovered by
-     * Flow. */
-    return (t) => Math.pow(t, n);
+  static poly(n: number) {
+    return (t: number) => Math.pow(t, n);
   }
 
   /**
    * A sinusoidal function.
    *
    * http://easings.net/#easeInSine
    */
-  /* $FlowFixMe(>=0.59.0 site=react_native_fb) This comment suppresses an error
-   * caught by Flow 0.59 which was not caught before. Most likely, this error
-   * is because an exported function parameter is missing an annotation.
-   * Without an annotation, these parameters are uncovered by Flow. */
-  static sin(t) {
+  static sin(t: number) {
     return 1 - Math.cos(t * Math.PI / 2);
   }
 
@@ -173,11 +140,7 @@ class Easing {
    *
    * http://easings.net/#easeInCirc
    */
-  /* $FlowFixMe(>=0.59.0 site=react_native_fb) This comment suppresses an error
-   * caught by Flow 0.59 which was not caught before. Most likely, this error
-   * is because an exported function parameter is missing an annotation.
-   * Without an annotation, these parameters are uncovered by Flow. */
-  static circle(t) {
+  static circle(t: number) {
     return 1 - Math.sqrt(1 - t * t);
   }
 
@@ -186,11 +149,7 @@ class Easing {
    *
    * http://easings.net/#easeInExpo
    */
-  /* $FlowFixMe(>=0.59.0 site=react_native_fb) This comment suppresses an error
-   * caught by Flow 0.59 which was not caught before. Most likely, this error
-   * is because an exported function parameter is missing an annotation.
-   * Without an annotation, these parameters are uncovered by Flow. */
-  static exp(t) {
+  static exp(t: number) {
     return Math.pow(2, 10 * (t - 1));
   }
 

Libraries/CameraRoll/CameraRoll.js

@@ -35,6 +35,15 @@ const ASSET_TYPE_OPTIONS = {
   Photos: 'Photos',
 };
 
+type GetPhotosParams = {
+  first: number,
+  after?: string,
+  groupTypes?: $Keys<typeof GROUP_TYPES_OPTIONS>,
+  groupName?: string,
+  assetType?: $Keys<typeof ASSET_TYPE_OPTIONS>,
+  mimeTypes?: Array<string>,
+};
+
 /**
  * Shape of the param arg for the `getPhotos` function.
  */
@@ -73,6 +82,35 @@ const getPhotosParamChecker = createStrictShapeTypeChecker({
   mimeTypes: PropTypes.arrayOf(PropTypes.string),
 });
 
+type GetPhotosReturn = Promise<{
+  edges: Array<{
+    node: {
+      type: string,
+      group_name: string,
+      image: {
+        uri: string,
+        height: number,
+        width: number,
+        isStored?: boolean,
+        playableDuration: number,
+      },
+      timestamp: number,
+      location?: {
+        latitude?: number,
+        longitude?: number,
+        altitude?: number,
+        heading?: number,
+        speed?: number,
+      },
+    },
+  }>,
+  page_info: {
+    has_next_page: boolean,
+    start_cursor?: string,
+    end_cursor?: string,
+  },
+}>;
+
 /**
  * Shape of the return value of the `getPhotos` function.
  */
@@ -162,8 +200,8 @@ class CameraRoll {
 
     invariant(
       type === 'photo' || type === 'video' || type === undefined,
-      // $FlowFixMe(>=0.28.0)
-      `The second argument to saveToCameraRoll must be 'photo' or 'video'. You passed ${type}`,
+      `The second argument to saveToCameraRoll must be 'photo' or 'video'. You passed ${type ||
+        'unknown'}`,
     );
 
     let mediaType = 'photo';
@@ -259,11 +297,7 @@ class CameraRoll {
    * }
    * ```
    */
-  /* $FlowFixMe(>=0.59.0 site=react_native_fb) This comment suppresses an error
-   * caught by Flow 0.59 which was not caught before. Most likely, this error
-   * is because an exported function parameter is missing an annotation.
-   * Without an annotation, these parameters are uncovered by Flow. */
-  static getPhotos(params) {
+  static getPhotos(params: GetPhotosParams): GetPhotosReturn {
     if (__DEV__) {
       checkPropTypes(
         {params: getPhotosParamChecker},

Libraries/StyleSheet/StyleSheetValidation.js

@@ -24,21 +24,14 @@ var invariant = require('fbjs/lib/invariant');
 const ReactPropTypesSecret = 'SECRET_DO_NOT_PASS_THIS_OR_YOU_WILL_BE_FIRED';
 
 class StyleSheetValidation {
-  /* $FlowFixMe(>=0.59.0 site=react_native_fb) This comment suppresses an error
-   * caught by Flow 0.59 which was not caught before. Most likely, this error
-   * is because an exported function parameter is missing an annotation.
-   * Without an annotation, these parameters are uncovered by Flow. */
-  static validateStyleProp(prop, style, caller) {
+  static validateStyleProp(prop: string, style: Object, caller: string) {
     if (!__DEV__) {
       return;
     }
     if (allStylePropTypes[prop] === undefined) {
       var message1 = '"' + prop + '" is not a valid style property.';
       var message2 = '\nValid style props: ' +
         JSON.stringify(Object.keys(allStylePropTypes).sort(), null, '  ');
-      /* $FlowFixMe(>=0.56.0 site=react_native_oss) This comment suppresses an
-       * error found when Flow v0.56 was deployed. To see the error delete this
-       * comment and run Flow. */
       styleError(message1, style, caller, message2);
     }
     var error = allStylePropTypes[prop](
@@ -50,21 +43,11 @@ class StyleSheetValidation {
       ReactPropTypesSecret,
     );
     if (error) {
-      /* $FlowFixMe(>=0.56.0 site=react_native_oss) This comment suppresses an
-       * error found when Flow v0.56 was deployed. To see the error delete this
-       * comment and run Flow. */
-      /* $FlowFixMe(>=0.56.0 site=react_native_fb,react_native_oss) This
-       * comment suppresses an error found when Flow v0.56 was deployed. To see
-       * the error delete this comment and run Flow. */
       styleError(error.message, style, caller);
     }
   }
 
-  /* $FlowFixMe(>=0.59.0 site=react_native_fb) This comment suppresses an error
-   * caught by Flow 0.59 which was not caught before. Most likely, this error
-   * is because an exported function parameter is missing an annotation.
-   * Without an annotation, these parameters are uncovered by Flow. */
-  static validateStyle(name, styles) {
+  static validateStyle(name: string, styles: Object) {
     if (!__DEV__) {
       return;
     }