Lets the user override any of the snapshot formatting options

e2e/snapshot-formatting-changes/__tests__/__snapshots__/snapshot.test.js.snap

@@ -0,0 +1,11 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`snapshot serializer prototypes for object and array: no prototypes 1`] = `
+{
+        "array": [
+                {
+                        "hello": "Danger",
+                },
+        ],
+}
+`;

e2e/snapshot-inline-basic-formatting/__tests__/snapshot.test.js → e2e/snapshot-formatting-changes/__tests__/snapshot.test.js

@@ -7,8 +7,8 @@
  */
 'use strict';
 
-describe('inline snapshot serializer', () => {
-  it('does not show prototypes for object and array', () => {
+describe('snapshot serializer', () => {
+  it('does not show prototypes for object and array inline', () => {
     const object = {
       array: [{hello: 'Danger'}],
     };
@@ -22,4 +22,11 @@ describe('inline snapshot serializer', () => {
 }
 `);
   });
+
+  it('prototypes for object and array', () => {
+    const object = {
+      array: [{hello: 'Danger'}],
+    };
+    expect(object).toMatchSnapshot('no prototypes');
+  });
 });

e2e/snapshot-formatting-changes/package.json

@@ -0,0 +1,12 @@
+{
+  "jest": {
+    "testEnvironment": "node",
+    "inlineSnapshotFormat": {
+      "printBasicPrototype": false
+    },
+    "snapshotFormat": {
+      "printBasicPrototype": false,
+      "indent": 8
+    }
+  }
+}

packages/jest-circus/src/legacy-code-todo-rewrite/jestAdapterInit.ts

@@ -155,8 +155,9 @@ export const initialize = async ({
   const snapshotPath = snapshotResolver.resolveSnapshotPath(testPath);
   const snapshotState = new SnapshotState(snapshotPath, {
     expand,
-    preferSimpleForInline: config.inlineSnapshotFormatter === 'simple',
+    inlineSnapshotFormat: config.inlineSnapshotFormat,
     prettierPath: config.prettierPath,
+    snapshotFormat: config.snapshotFormat,
     updateSnapshot,
   });
   // @ts-expect-error: snapshotState is a jest extension of `expect`

packages/jest-config/src/ValidConfig.ts

@@ -8,6 +8,7 @@
 import type {Config} from '@jest/types';
 import {replacePathSepForRegex} from 'jest-regex-util';
 import {multipleValidOptions} from 'jest-validate';
+import {DEFAULT_OPTIONS as PRETTY_FORMAT_DEFAULTS} from 'pretty-format';
 import {NODE_MODULES} from './constants';
 
 const NODE_MODULES_REGEXP = replacePathSepForRegex(NODE_MODULES);
@@ -66,10 +67,7 @@ const initialOptions: Config.InitialOptions = {
     throwOnModuleCollision: false,
   },
   injectGlobals: true,
-  inlineSnapshotFormatter: multipleValidOptions(
-    'exposed prototypes',
-    'simple',
-  ) as any,
+  inlineSnapshotFormat: PRETTY_FORMAT_DEFAULTS,
   json: false,
   lastCommit: false,
   listTests: false,
@@ -113,6 +111,7 @@ const initialOptions: Config.InitialOptions = {
   skipFilter: false,
   skipNodeResolution: false,
   slowTestThreshold: 5,
+  snapshotFormat: PRETTY_FORMAT_DEFAULTS,
   snapshotResolver: '<rootDir>/snapshotResolver.js',
   snapshotSerializers: ['my-serializer-module'],
   testEnvironment: 'jest-environment-jsdom',

packages/jest-config/src/index.ts

@@ -127,7 +127,7 @@ const groupOptions = (
     forceExit: options.forceExit,
     globalSetup: options.globalSetup,
     globalTeardown: options.globalTeardown,
-    inlineSnapshotFormatter: options.inlineSnapshotFormatter,
+    inlineSnapshotFormat: options.inlineSnapshotFormat,
     json: options.json,
     lastCommit: options.lastCommit,
     listTests: options.listTests,
@@ -150,6 +150,7 @@ const groupOptions = (
     runTestsByPath: options.runTestsByPath,
     silent: options.silent,
     skipFilter: options.skipFilter,
+    snapshotFormat: options.snapshotFormat,
     testFailureExitCode: options.testFailureExitCode,
     testNamePattern: options.testNamePattern,
     testPathPattern: options.testPathPattern,
@@ -185,7 +186,7 @@ const groupOptions = (
     globals: options.globals,
     haste: options.haste,
     injectGlobals: options.injectGlobals,
-    inlineSnapshotFormatter: options.inlineSnapshotFormatter,
+    inlineSnapshotFormat: options.inlineSnapshotFormat,
     moduleDirectories: options.moduleDirectories,
     moduleFileExtensions: options.moduleFileExtensions,
     moduleLoader: options.moduleLoader,
@@ -206,6 +207,7 @@ const groupOptions = (
     skipFilter: options.skipFilter,
     skipNodeResolution: options.skipNodeResolution,
     slowTestThreshold: options.slowTestThreshold,
+    snapshotFormat: options.snapshotFormat,
     snapshotResolver: options.snapshotResolver,
     snapshotSerializers: options.snapshotSerializers,
     testEnvironment: options.testEnvironment,

packages/jest-config/src/normalize.ts

@@ -27,6 +27,7 @@ import {
   tryRealpath,
 } from 'jest-util';
 import {ValidationError, validate} from 'jest-validate';
+import {DEFAULT_OPTIONS as PRETTY_FORMAT_DEFAULTS} from 'pretty-format';
 import DEFAULT_CONFIG from './Defaults';
 import DEPRECATED_CONFIG from './Deprecated';
 import {validateReporters} from './ReporterValidationErrors';
@@ -970,6 +971,7 @@ export default async function normalize(
       case 'extensionsToTreatAsEsm':
       case 'extraGlobals':
       case 'globals':
+      case 'inlineSnapshotFormat':
       case 'findRelatedTests':
       case 'forceCoverageMatch':
       case 'forceExit':
@@ -997,6 +999,7 @@ export default async function normalize(
       case 'skipFilter':
       case 'skipNodeResolution':
       case 'slowTestThreshold':
+      case 'snapshotFormat':
       case 'testEnvironment':
       case 'testEnvironmentOptions':
       case 'testFailureExitCode':

packages/jest-snapshot/src/State.ts

@@ -8,6 +8,7 @@
 import * as fs from 'graceful-fs';
 import type {Config} from '@jest/types';
 import {getStackTraceLines, getTopFrame} from 'jest-message-util';
+import type {OptionsReceived as PrettyFormatOptions} from 'pretty-format';
 import {InlineSnapshot, saveInlineSnapshots} from './InlineSnapshots';
 import type {SnapshotData} from './types';
 import {
@@ -26,6 +27,8 @@ export type SnapshotStateOptions = {
   prettierPath: Config.Path;
   expand?: boolean;
   preferSimpleForInline?: boolean;
+  snapshotFormat: PrettyFormatOptions;
+  inlineSnapshotFormat: PrettyFormatOptions;
 };
 
 export type SnapshotMatchOptions = {
@@ -62,7 +65,8 @@ export default class SnapshotState {
   private _inlineSnapshots: Array<InlineSnapshot>;
   private _uncheckedKeys: Set<string>;
   private _prettierPath: Config.Path;
-  private _preferSimpleInlineSnapshots: boolean;
+  private _snapshotFormat: PrettyFormatOptions;
+  private _inlineSnapshotFormat: PrettyFormatOptions;
 
   added: number;
   expand: boolean;
@@ -90,7 +94,9 @@ export default class SnapshotState {
     this.unmatched = 0;
     this._updateSnapshot = options.updateSnapshot;
     this.updated = 0;
-    this._preferSimpleInlineSnapshots = options.preferSimpleForInline || false;
+
+    this._snapshotFormat = options.snapshotFormat;
+    this._inlineSnapshotFormat = options.inlineSnapshotFormat;
   }
 
   markSnapshotsAsCheckedForTest(testName: string): void {
@@ -204,13 +210,12 @@ export default class SnapshotState {
       this._uncheckedKeys.delete(key);
     }
 
-    // There is an option to allow for not showing 'Object' and 'Array' on
-    // snapshots, which we'd like to allow for opting into with inline snapshots.
-    const hasOptedInToSimpleInline =
-      isInline && this._preferSimpleInlineSnapshots;
+    const customFormat = isInline
+      ? this._inlineSnapshotFormat
+      : this._snapshotFormat;
 
     const receivedSerialized = addExtraLineBreaks(
-      serialize(received, undefined, hasOptedInToSimpleInline),
+      serialize(received, undefined, customFormat),
     );
     const expected = isInline ? inlineSnapshot : this._snapshotData[key];
     const pass = expected === receivedSerialized;

packages/jest-snapshot/src/utils.ts

@@ -10,7 +10,10 @@ import chalk = require('chalk');
 import * as fs from 'graceful-fs';
 import naturalCompare = require('natural-compare');
 import type {Config} from '@jest/types';
-import {format as prettyFormat} from 'pretty-format';
+import {
+  OptionsReceived as PrettyFormatOptions,
+  format as prettyFormat,
+} from 'pretty-format';
 import {getSerializers} from './plugins';
 import type {SnapshotData} from './types';
 
@@ -155,15 +158,15 @@ const printFunctionName = false;
 export const serialize = (
   val: unknown,
   indent = 2,
-  printBasicPrototype: boolean = true,
+  formatOverrides: PrettyFormatOptions = {},
 ): string =>
   normalizeNewlines(
     prettyFormat(val, {
       escapeRegex,
       indent,
       plugins: getSerializers(),
-      printBasicPrototype,
       printFunctionName,
+      ...formatOverrides,
     }),
   );
 

packages/jest-types/src/Config.ts

@@ -8,6 +8,7 @@
 import type {ForegroundColor} from 'chalk';
 import type {ReportOptions} from 'istanbul-reports';
 import type {Arguments} from 'yargs';
+import type {OptionsReceived as PrettyFormatOptions} from 'pretty-format';
 
 type CoverageProvider = 'babel' | 'v8';
 
@@ -171,7 +172,7 @@ export type InitialOptions = Partial<{
   globalTeardown: string | null | undefined;
   haste: HasteConfig;
   injectGlobals: boolean;
-  inlineSnapshotFormatter: 'exposed prototypes' | 'simple';
+  inlineSnapshotFormat: PrettyFormatOptions;
   reporters: Array<string | ReporterConfig>;
   logHeapUsage: boolean;
   lastCommit: boolean;
@@ -217,6 +218,7 @@ export type InitialOptions = Partial<{
   slowTestThreshold: number;
   snapshotResolver: Path;
   snapshotSerializers: Array<Path>;
+  snapshotFormat: PrettyFormatOptions;
   errorOnDeprecated: boolean;
   testEnvironment: string;
   testEnvironmentOptions: Record<string, unknown>;
@@ -293,7 +295,7 @@ export type GlobalConfig = {
   json: boolean;
   globalSetup?: string;
   globalTeardown?: string;
-  inlineSnapshotFormatter: 'exposed prototypes' | 'simple';
+  inlineSnapshotFormat: PrettyFormatOptions;
   lastCommit: boolean;
   logHeapUsage: boolean;
   listTests: boolean;
@@ -315,6 +317,7 @@ export type GlobalConfig = {
   rootDir: Path;
   silent?: boolean;
   skipFilter: boolean;
+  snapshotFormat: PrettyFormatOptions;
   errorOnDeprecated: boolean;
   testFailureExitCode: number;
   testNamePattern?: string;
@@ -354,7 +357,7 @@ export type ProjectConfig = {
   globalTeardown?: string;
   globals: ConfigGlobals;
   haste: HasteConfig;
-  inlineSnapshotFormatter: 'exposed prototypes' | 'simple';
+  inlineSnapshotFormat: PrettyFormatOptions;
   injectGlobals: boolean;
   moduleDirectories: Array<string>;
   moduleFileExtensions: Array<string>;
@@ -378,6 +381,7 @@ export type ProjectConfig = {
   slowTestThreshold: number;
   snapshotResolver?: Path;
   snapshotSerializers: Array<Path>;
+  snapshotFormat: PrettyFormatOptions;
   testEnvironment: string;
   testEnvironmentOptions: Record<string, unknown>;
   testMatch: Array<Glob>;

packages/pretty-format/src/index.ts

@@ -394,7 +394,7 @@ const DEFAULT_THEME_KEYS = Object.keys(DEFAULT_THEME) as Array<
   keyof typeof DEFAULT_THEME
 >;
 
-const DEFAULT_OPTIONS: Options = {
+export const DEFAULT_OPTIONS: Options = {
   callToJSON: true,
   escapeRegex: false,
   escapeString: true,

packages/test-utils/src/config.ts

@@ -27,7 +27,7 @@ const DEFAULT_GLOBAL_CONFIG: Config.GlobalConfig = {
   forceExit: false,
   globalSetup: undefined,
   globalTeardown: undefined,
-  inlineSnapshotFormatter: 'exposed prototypes',
+  inlineSnapshotFormat: {},
   json: false,
   lastCommit: false,
   listTests: false,
@@ -50,6 +50,7 @@ const DEFAULT_GLOBAL_CONFIG: Config.GlobalConfig = {
   runTestsByPath: false,
   silent: false,
   skipFilter: false,
+  snapshotFormat: {},
   testFailureExitCode: 1,
   testNamePattern: '',
   testPathPattern: '',
@@ -85,7 +86,7 @@ const DEFAULT_PROJECT_CONFIG: Config.ProjectConfig = {
   globals: {},
   haste: {},
   injectGlobals: true,
-  inlineSnapshotFormatter: 'exposed prototypes',
+  inlineSnapshotFormat: {},
   moduleDirectories: [],
   moduleFileExtensions: ['js'],
   moduleLoader: '/test_module_loader_path',
@@ -106,6 +107,7 @@ const DEFAULT_PROJECT_CONFIG: Config.ProjectConfig = {
   skipFilter: false,
   skipNodeResolution: false,
   slowTestThreshold: 5,
+  snapshotFormat: {},
   snapshotResolver: undefined,
   snapshotSerializers: [],
   testEnvironment: 'node',