fix jest's test.table flow type

Summary:
The current flow type disallows passing in an `Array<string>` since the current
type signature would allow just to append to the `Array`, `$ReadOnlyArray`
doesn't allow writing.

@public

Reviewed By: jstejada

Differential Revision: D16354977

fbshipit-source-id: a83c1227c1a15225487ac8672818d8b319dce32f

flow/jest.js

@@ -953,7 +953,7 @@ declare var describe: {
    * @param {table} table of Test
    */
   each(
-    table: Array<Array<mixed> | mixed>,
+    table: $ReadOnlyArray<mixed | $ReadOnlyArray<mixed>>,
   ): (
     name: JestTestName,
     fn?: (...args: Array<any>) => ?Promise<mixed>,
@@ -980,7 +980,7 @@ declare var it: {
    * @param {table} table of Test
    */
   each(
-    table: Array<Array<mixed> | mixed>,
+    table: $ReadOnlyArray<mixed | $ReadOnlyArray<mixed>>,
   ): (
     name: JestTestName,
     fn?: (...args: Array<any>) => ?Promise<mixed>,
@@ -998,7 +998,7 @@ declare var it: {
     timeout?: number,
   ): {
     each(
-      table: Array<Array<mixed> | mixed>,
+      table: $ReadOnlyArray<mixed | $ReadOnlyArray<mixed>>,
     ): (
       name: JestTestName,
       fn?: (...args: Array<any>) => ?Promise<mixed>,
@@ -1034,7 +1034,7 @@ declare var it: {
    * @param {table} table of Test
    */
   each(
-    table: Array<Array<mixed> | mixed>,
+    table: $ReadOnlyArray<mixed | $ReadOnlyArray<mixed>>,
   ): (
     name: JestTestName,
     fn?: (...args: Array<any>) => ?Promise<mixed>,
@@ -1065,9 +1065,7 @@ type JestPrettyFormatColors = {
 };
 
 type JestPrettyFormatIndent = string => string;
-type JestPrettyFormatRefs = Array<any>;
 type JestPrettyFormatPrint = any => string;
-type JestPrettyFormatStringOrNull = string | null;
 
 type JestPrettyFormatOptions = {|
   callToJSON: boolean,