feat: create new @jest/schemas type

CHANGELOG.md

@@ -10,6 +10,7 @@
 - `[jest-environment-node]` [**BREAKING**] Add default `node` and `node-addon` conditions to `exportConditions` for `node` environment ([#11924](https://github.com/facebook/jest/pull/11924))
 - `[@jest/expect-utils]` New module exporting utils for `expect` ([#12323](https://github.com/facebook/jest/pull/12323))
 - `[jest-resolver]` [**BREAKING**] Add support for `package.json` `exports` ([11961](https://github.com/facebook/jest/pull/11961))
+- `[@jes/schemas]` New module for JSON schemas for Jest's config ([#12384](https://github.com/facebook/jest/pull/12384))
 - `[jest-worker]` [**BREAKING**] Allow only absolute `workerPath` ([#12343](https://github.com/facebook/jest/pull/12343))
 
 ### Fixes

packages/jest-schemas/.npmignore

@@ -0,0 +1,6 @@
+**/__mocks__/**
+**/__tests__/**
+src
+tsconfig.json
+tsconfig.tsbuildinfo
+api-extractor.json

packages/jest-schemas/README.md

@@ -0,0 +1,3 @@
+# `@jest/schemas`
+
+Experimental and currently incomplete module for JSON schemas for [Jest's](https://jestjs.io/) configuration.

packages/jest-schemas/package.json

@@ -0,0 +1,28 @@
+{
+  "name": "@jest/schemas",
+  "version": "28.0.0-alpha.0",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/facebook/jest.git",
+    "directory": "packages/jest-schemas"
+  },
+  "license": "MIT",
+  "main": "./build/index.js",
+  "types": "./build/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./build/index.d.ts",
+      "default": "./build/index.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "dependencies": {
+    "@sinclair/typebox": "^0.23.3"
+  },
+  "engines": {
+    "node": "^12.13.0 || ^14.15.0 || ^16.13.0 || >=17.0.0"
+  },
+  "publishConfig": {
+    "access": "public"
+  }
+}

packages/jest-schemas/src/index.ts

@@ -0,0 +1,36 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import {Static, Type} from '@sinclair/typebox';
+
+const RawSnapshotFormat = Type.Partial(
+  Type.Object({
+    callToJSON: Type.Readonly(Type.Boolean()),
+    escapeRegex: Type.Readonly(Type.Boolean()),
+    escapeString: Type.Readonly(Type.Boolean()),
+    highlight: Type.Readonly(Type.Boolean()),
+    indent: Type.Readonly(Type.Number({minimum: 0})),
+    maxDepth: Type.Readonly(Type.Number({minimum: 0})),
+    min: Type.Readonly(Type.Boolean()),
+    printBasicPrototype: Type.Readonly(Type.Boolean()),
+    printFunctionName: Type.Readonly(Type.Boolean()),
+    theme: Type.Readonly(
+      Type.Partial(
+        Type.Object({
+          comment: Type.Readonly(Type.String()),
+          content: Type.Readonly(Type.String()),
+          prop: Type.Readonly(Type.String()),
+          tag: Type.Readonly(Type.String()),
+          value: Type.Readonly(Type.String()),
+        }),
+      ),
+    ),
+  }),
+);
+
+export const SnapshotFormat = Type.Strict(RawSnapshotFormat);
+export type SnapshotFormat = Static<typeof RawSnapshotFormat>;

packages/jest-schemas/tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "build"
+  },
+  "include": ["./src/**/*"],
+  "exclude": ["./**/__mocks__/**/*", "./**/__tests__/**/*"]
+}

packages/jest-types/package.json

@@ -20,6 +20,7 @@
     "./package.json": "./package.json"
   },
   "dependencies": {
+    "@jest/schemas": "28.0.0-alpha.0",
     "@types/istanbul-lib-coverage": "^2.0.0",
     "@types/istanbul-reports": "^3.0.0",
     "@types/node": "*",

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 {SnapshotFormat} from '@jest/schemas';
 
 type CoverageProvider = 'babel' | 'v8';
 
@@ -60,9 +61,6 @@ export interface ConfigGlobals {
   [K: string]: unknown;
 }
 
-// This interface gets filled out when pretty-format is included
-export interface PrettyFormatOptions {}
-
 export type DefaultOptions = {
   automock: boolean;
   bail: number;
@@ -228,7 +226,7 @@ export type InitialOptions = Partial<{
   slowTestThreshold: number;
   snapshotResolver: Path;
   snapshotSerializers: Array<Path>;
-  snapshotFormat: PrettyFormatOptions;
+  snapshotFormat: SnapshotFormat;
   errorOnDeprecated: boolean;
   testEnvironment: string;
   testEnvironmentOptions: Record<string, unknown>;
@@ -330,7 +328,7 @@ export type GlobalConfig = {
   rootDir: Path;
   silent?: boolean;
   skipFilter: boolean;
-  snapshotFormat: PrettyFormatOptions;
+  snapshotFormat: SnapshotFormat;
   errorOnDeprecated: boolean;
   testFailureExitCode: number;
   testNamePattern?: string;
@@ -393,7 +391,7 @@ export type ProjectConfig = {
   slowTestThreshold: number;
   snapshotResolver?: Path;
   snapshotSerializers: Array<Path>;
-  snapshotFormat: PrettyFormatOptions;
+  snapshotFormat: SnapshotFormat;
   testEnvironment: string;
   testEnvironmentOptions: Record<string, unknown>;
   testMatch: Array<Glob>;

packages/jest-types/tsconfig.json

@@ -4,5 +4,6 @@
     "rootDir": "src",
     "outDir": "build"
   },
-  "include": ["./src/**/*"]
+  "include": ["./src/**/*"],
+  "references": [{"path": "../jest-schemas"}]
 }

packages/pretty-format/package.json

@@ -20,6 +20,7 @@
   },
   "author": "James Kyle <me@thejameskyle.com>",
   "dependencies": {
+    "@jest/schemas": "28.0.0-alpha.0",
     "ansi-regex": "^5.0.1",
     "ansi-styles": "^5.0.0",
     "react-is": "^17.0.1"

packages/pretty-format/src/types.ts

@@ -5,6 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+import type {SnapshotFormat} from '@jest/schemas';
+
 export type Colors = {
   comment: {close: string; open: string};
   content: {close: string; open: string};
@@ -16,52 +18,21 @@ type Indent = (arg0: string) => string;
 export type Refs = Array<unknown>;
 type Print = (arg0: unknown) => string;
 
-export type Theme = {
-  comment: string;
-  content: string;
-  prop: string;
-  tag: string;
-  value: string;
-};
-
-type ThemeReceived = {
-  comment?: string;
-  content?: string;
-  prop?: string;
-  tag?: string;
-  value?: string;
-};
+export type Theme = Options['theme'];
 
 export type CompareKeys = ((a: string, b: string) => number) | undefined;
 
-export type Options = {
-  callToJSON: boolean;
+type RequiredOptions = Required<PrettyFormatOptions>;
+
+export interface Options
+  extends Omit<RequiredOptions, 'compareKeys' | 'theme'> {
   compareKeys: CompareKeys;
-  escapeRegex: boolean;
-  escapeString: boolean;
-  highlight: boolean;
-  indent: number;
-  maxDepth: number;
-  min: boolean;
-  plugins: Plugins;
-  printBasicPrototype: boolean;
-  printFunctionName: boolean;
-  theme: Theme;
-};
+  theme: Required<RequiredOptions['theme']>;
+}
 
-export interface PrettyFormatOptions {
-  callToJSON?: boolean;
+export interface PrettyFormatOptions extends SnapshotFormat {
   compareKeys?: CompareKeys;
-  escapeRegex?: boolean;
-  escapeString?: boolean;
-  highlight?: boolean;
-  indent?: number;
-  maxDepth?: number;
-  min?: boolean;
   plugins?: Plugins;
-  printBasicPrototype?: boolean;
-  printFunctionName?: boolean;
-  theme?: ThemeReceived;
 }
 
 export type OptionsReceived = PrettyFormatOptions;

packages/pretty-format/tsconfig.json

@@ -6,5 +6,5 @@
   },
   "include": ["./src/**/*"],
   "exclude": ["./**/__tests__/**/*"],
-  "references": [{"path": "../jest-util"}]
+  "references": [{"path": "../jest-schemas"}, {"path": "../jest-util"}]
 }

yarn.lock

@@ -2753,6 +2753,14 @@ __metadata:
   languageName: unknown
   linkType: soft
 
+"@jest/schemas@28.0.0-alpha.0, @jest/schemas@workspace:packages/jest-schemas":
+  version: 0.0.0-use.local
+  resolution: "@jest/schemas@workspace:packages/jest-schemas"
+  dependencies:
+    "@sinclair/typebox": ^0.23.3
+  languageName: unknown
+  linkType: soft
+
 "@jest/source-map@^28.0.0-alpha.0, @jest/source-map@workspace:packages/jest-source-map":
   version: 0.0.0-use.local
   resolution: "@jest/source-map@workspace:packages/jest-source-map"
@@ -2847,6 +2855,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@jest/types@workspace:packages/jest-types"
   dependencies:
+    "@jest/schemas": 28.0.0-alpha.0
     "@tsd/typescript": ~4.5.5
     "@types/istanbul-lib-coverage": ^2.0.0
     "@types/istanbul-reports": ^3.0.0
@@ -4359,6 +4368,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@sinclair/typebox@npm:^0.23.3":
+  version: 0.23.3
+  resolution: "@sinclair/typebox@npm:0.23.3"
+  checksum: c8d961c8af1b701e67641770376010634730076f0412dda34b01f1d6f54d98916414335b51929285ade43ab85bb14a372bbc287575ce4b1e0179d8af808ec4d7
+  languageName: node
+  linkType: hard
+
 "@sindresorhus/is@npm:^0.14.0":
   version: 0.14.0
   resolution: "@sindresorhus/is@npm:0.14.0"
@@ -17802,6 +17818,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "pretty-format@workspace:packages/pretty-format"
   dependencies:
+    "@jest/schemas": 28.0.0-alpha.0
     "@types/react": "*"
     "@types/react-is": ^17.0.0
     "@types/react-test-renderer": "*"