Add ignoredPaths option to ignore serializability check (#320)

* Support ignoredSlices in serializableStateInvariantMiddleware

* Don't need to check for length

* Change to ignoredPaths

* Update doc

* Check hasIgnoredPaths first to skip checking indexOf

docs/api/otherExports.md

@@ -15,7 +15,26 @@ Redux Toolkit exports some of its internal utilities, and re-exports additional
 
 Creates an instance of the `serializable-state-invariant` middleware described in [`getDefaultMiddleware`](./getDefaultMiddleware.md).
 
-Accepts an options object with `isSerializable` and `getEntries` parameters. The former, `isSerializable`, will be used to determine if a value is considered serializable or not. If not provided, this defaults to `isPlain`. The latter, `getEntries`, will be used to retrieve nested values. If not provided, `Object.entries` will be used by default.
+Accepts a single configuration object parameter, with the following options:
+
+```ts
+function createSerializableStateInvariantMiddleware({
+  // The function to check if a value is considered serializable.
+  // This function is applied recursively to every value contained in the state.
+  // Defaults to `isPlain()`.
+  isSerializable?: (value: any) => boolean
+  // The function that will be used to retrieve entries from each value.
+  // If unspecified, `Object.entries` will be used.
+  // Defaults to `undefined`.
+  getEntries?: (value: any) => [string, any][]
+  // An array of action types to ignore when checking for serializability.
+  // Defaults to []
+  ignoredActions?: string[]
+  // An array of dot-separated path strings to ignore when checking for serializability.
+  // Defaults to []
+  ignoredPaths?: string[]
+})
+```
 
 Example:
 

etc/redux-toolkit.api.md

@@ -130,7 +130,7 @@ export interface EnhancedStore<S = any, A extends Action = AnyAction, M extends
 }
 
 // @public (undocumented)
-export function findNonSerializableValue(value: unknown, path?: ReadonlyArray<string>, isSerializable?: (value: unknown) => boolean, getEntries?: (value: unknown) => [string, any][]): NonSerializableValue | false;
+export function findNonSerializableValue(value: unknown, path?: ReadonlyArray<string>, isSerializable?: (value: unknown) => boolean, getEntries?: (value: unknown) => [string, any][], ignoredPaths?: string[]): NonSerializableValue | false;
 
 // @public
 export function getDefaultMiddleware<S = any, O extends Partial<GetDefaultMiddlewareOptions> = {
@@ -177,6 +177,7 @@ export type PrepareAction<P> = ((...args: any[]) => {
 export interface SerializableStateInvariantMiddlewareOptions {
     getEntries?: (value: any) => [string, any][];
     ignoredActions?: string[];
+    ignoredPaths?: string[];
     isSerializable?: (value: any) => boolean;
 }
 

src/serializableStateInvariantMiddleware.test.ts

@@ -329,4 +329,60 @@ describe('serializableStateInvariantMiddleware', () => {
 
     expect(numTimesCalled).toBeGreaterThan(0)
   })
+
+  it('should not check serializability for ignored slice names', () => {
+    const ACTION_TYPE = 'TEST_ACTION'
+
+    const initialState = {
+      a: 0
+    }
+
+    const badValue = new Map()
+
+    const reducer: Reducer = (state = initialState, action) => {
+      switch (action.type) {
+        case ACTION_TYPE: {
+          return {
+            a: badValue,
+            b: {
+              c: badValue,
+              d: badValue
+            },
+            e: { f: badValue }
+          }
+        }
+        default:
+          return state
+      }
+    }
+
+    const serializableStateInvariantMiddleware = createSerializableStateInvariantMiddleware(
+      {
+        ignoredPaths: [
+          // Test for ignoring a single value
+          'testSlice.a',
+          // Test for ignoring a single nested value
+          'testSlice.b.c',
+          // Test for ignoring an object and its children
+          'testSlice.e'
+        ]
+      }
+    )
+
+    const store = configureStore({
+      reducer: {
+        testSlice: reducer
+      },
+      middleware: [serializableStateInvariantMiddleware]
+    })
+
+    store.dispatch({ type: ACTION_TYPE })
+
+    // testSlice.b.d was not covered in ignoredPaths, so will still log the error
+    expect(getLog().log).toMatchInlineSnapshot(`
+      "A non-serializable value was detected in the state, in the path: \`testSlice.b.d\`. Value: Map {} 
+      Take a look at the reducer(s) handling this action type: TEST_ACTION.
+      (See https://redux.js.org/faq/organizing-state#can-i-put-functions-promises-or-other-non-serializable-items-in-my-store-state)"
+    `)
+  })
 })

src/serializableStateInvariantMiddleware.ts

@@ -34,7 +34,8 @@ export function findNonSerializableValue(
   value: unknown,
   path: ReadonlyArray<string> = [],
   isSerializable: (value: unknown) => boolean = isPlain,
-  getEntries?: (value: unknown) => [string, any][]
+  getEntries?: (value: unknown) => [string, any][],
+  ignoredPaths: string[] = []
 ): NonSerializableValue | false {
   let foundNestedSerializable: NonSerializableValue | false
 
@@ -51,9 +52,15 @@ export function findNonSerializableValue(
 
   const entries = getEntries != null ? getEntries(value) : Object.entries(value)
 
+  const hasIgnoredPaths = ignoredPaths.length > 0
+
   for (const [property, nestedValue] of entries) {
     const nestedPath = path.concat(property)
 
+    if (hasIgnoredPaths && ignoredPaths.indexOf(nestedPath.join('.')) >= 0) {
+      continue
+    }
+
     if (!isSerializable(nestedValue)) {
       return {
         keyPath: nestedPath.join('.'),
@@ -66,7 +73,8 @@ export function findNonSerializableValue(
         nestedValue,
         nestedPath,
         isSerializable,
-        getEntries
+        getEntries,
+        ignoredPaths
       )
 
       if (foundNestedSerializable) {
@@ -101,6 +109,11 @@ export interface SerializableStateInvariantMiddlewareOptions {
    * An array of action types to ignore when checking for serializability, Defaults to []
    */
   ignoredActions?: string[]
+
+  /**
+   * An array of dot-separated path strings to ignore when checking for serializability, Defaults to []
+   */
+  ignoredPaths?: string[]
 }
 
 /**
@@ -115,7 +128,12 @@ export interface SerializableStateInvariantMiddlewareOptions {
 export function createSerializableStateInvariantMiddleware(
   options: SerializableStateInvariantMiddlewareOptions = {}
 ): Middleware {
-  const { isSerializable = isPlain, getEntries, ignoredActions = [] } = options
+  const {
+    isSerializable = isPlain,
+    getEntries,
+    ignoredActions = [],
+    ignoredPaths = []
+  } = options
 
   return storeAPI => next => action => {
     if (ignoredActions.length && ignoredActions.indexOf(action.type) !== -1) {
@@ -149,7 +167,8 @@ export function createSerializableStateInvariantMiddleware(
       state,
       [],
       isSerializable,
-      getEntries
+      getEntries,
+      ignoredPaths
     )
 
     if (foundStateNonSerializableValue) {