fix: add setSerializers and defaultSerializers to TS types (#95)

Author: thymikee

index.d.ts

@@ -1,42 +1,60 @@
 /// <reference types="jest"/>
 
 type DiffOptions = {
-  expand?: boolean
-  colors?: boolean
-  contextLines?: number
-  stablePatchmarks?: boolean
-  aAnnotation?: string
-  bAnnotation?: string
-}
+  expand?: boolean;
+  colors?: boolean;
+  contextLines?: number;
+  stablePatchmarks?: boolean;
+  aAnnotation?: string;
+  bAnnotation?: string;
+};
 
 declare namespace jest {
   interface Matchers<R, T> {
     /**
      * Compare the difference between the actual in the `expect()`
      * vs the object inside `valueB` with some extra options.
      */
-    toMatchDiffSnapshot(valueB: any, options?: DiffOptions, testName?: string): R
+    toMatchDiffSnapshot(
+      valueB: any,
+      options?: DiffOptions,
+      testName?: string
+    ): R;
   }
 }
 
-declare module "snapshot-diff" {
+interface Serializer {
+  test: (value: any) => boolean;
+  print: (value: any, _serializer?: Function) => string;
+  diffOptions: (valueA: any, valueB: any) => DiffOptions;
+}
+
+declare module 'snapshot-diff' {
   interface SnapshotDiff {
     /**
      * Compare the changes from a, to b
      */
-    (a: any, b: any, options?: DiffOptions): string
+    (a: any, b: any, options?: DiffOptions): string;
     /**
      * Allows you to pull out toMatchDiffSnapshot and
      * make it available via `expect.extend({ toMatchDiffSnapshot })`.
      */
-    toMatchDiffSnapshot: jest.CustomMatcher
+    toMatchDiffSnapshot: jest.CustomMatcher;
     /**
      * By default Jest adds extra quotes around strings so it makes diff
      * snapshots of objects too noisy. To fix this – snapshot-diff comes
      * with custom serializer.
      */
-    getSnapshotDiffSerializer: () => jest.SnapshotSerializerPlugin
+    getSnapshotDiffSerializer: () => jest.SnapshotSerializerPlugin;
+    /**
+     * Add new serializers for unsupported data types, or to set a different
+     * serializer for React components. If you want to keep the default React
+     * serializer in place, don't forget to add the default serializers to your
+     * list of serializers.
+     */
+    setSerializers: (serializers: Array<Serializer>) => void;
+    defaultSerializers: Array<Serializer>;
   }
-  const diff: SnapshotDiff
-  export = diff
+  const diff: SnapshotDiff;
+  export = diff;
 }