jestjs · SimenB · May 2, 2020 · May 2, 2020
diff --git a/package.json b/package.json
@@ -18,8 +18,8 @@
     "@types/jest": "24.0.2",
     "@types/node": "*",
     "@types/which": "^1.3.2",
-    "@typescript-eslint/eslint-plugin": "^2.19.0",
-    "@typescript-eslint/parser": "^2.19.0",
+    "@typescript-eslint/eslint-plugin": "^2.30.0",
+    "@typescript-eslint/parser": "^2.30.0",
     "ansi-regex": "^5.0.0",
     "ansi-styles": "^4.2.0",
     "babel-eslint": "^10.0.3",

diff --git a/packages/expect/src/extractExpectedAssertionsErrors.ts b/packages/expect/src/extractExpectedAssertionsErrors.ts
@@ -23,10 +23,16 @@ const resetAssertionsLocalState = () => {
   });
 };
 
+type AssertionsErrors = Array<{
+  actual: string;
+  error: string;
+  expected: string | number;
+}>;
+
 // Create and format all errors related to the mismatched number of `expect`
 // calls and reset the matcher's state.
-const extractExpectedAssertionsErrors = () => {
-  const result = [];
+const extractExpectedAssertionsErrors: () => AssertionsErrors = () => {
+  const result: AssertionsErrors = [];
   const {
     assertionCalls,
     expectedAssertionsNumber,

diff --git a/packages/jest-circus/src/formatNodeAssertErrors.ts b/packages/jest-circus/src/formatNodeAssertErrors.ts
@@ -38,7 +38,10 @@ const humanReadableOperators: Record<string, string> = {
   strictEqual: 'to strictly be equal',
 };
 
-const formatNodeAssertErrors = (event: Circus.Event, state: Circus.State) => {
+const formatNodeAssertErrors = (
+  event: Circus.Event,
+  state: Circus.State,
+): void => {
   if (event.name === 'test_done') {
     event.test.errors = event.test.errors.map((errors: Circus.TestError) => {
       let error;

diff --git a/packages/jest-core/src/lib/active_filters_message.ts b/packages/jest-core/src/lib/active_filters_message.ts
@@ -11,7 +11,7 @@ import type {Config} from '@jest/types';
 const activeFilters = (
   globalConfig: Config.GlobalConfig,
   delimiter: string = '\n',
-) => {
+): string => {
   const {testNamePattern, testPathPattern} = globalConfig;
   if (testNamePattern || testPathPattern) {
     const filters = [

diff --git a/packages/jest-core/src/plugins/quit.ts b/packages/jest-core/src/plugins/quit.ts
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import {BaseWatchPlugin} from 'jest-watcher';
+import {BaseWatchPlugin, UsageData} from 'jest-watcher';
 
 class QuitPlugin extends BaseWatchPlugin {
   isInternal: true;
@@ -15,15 +15,15 @@ class QuitPlugin extends BaseWatchPlugin {
     this.isInternal = true;
   }
 
-  async run() {
+  async run(): Promise<void> {
     if (typeof this._stdin.setRawMode === 'function') {
       this._stdin.setRawMode(false);
     }
     this._stdout.write('\n');
     process.exit(0);
   }
 
-  getUsageInfo() {
+  getUsageInfo(): UsageData {
     return {
       key: 'q',
       prompt: 'quit watch mode',

diff --git a/packages/jest-core/src/plugins/test_name_pattern.ts b/packages/jest-core/src/plugins/test_name_pattern.ts
@@ -6,7 +6,12 @@
  */
 
 import type {Config} from '@jest/types';
-import {BaseWatchPlugin, Prompt, UpdateConfigCallback} from 'jest-watcher';
+import {
+  BaseWatchPlugin,
+  Prompt,
+  UpdateConfigCallback,
+  UsageData,
+} from 'jest-watcher';
 import TestNamePatternPrompt from '../TestNamePatternPrompt';
 import activeFilters from '../lib/active_filters_message';
 
@@ -20,14 +25,14 @@ class TestNamePatternPlugin extends BaseWatchPlugin {
     this.isInternal = true;
   }
 
-  getUsageInfo() {
+  getUsageInfo(): UsageData {
     return {
       key: 't',
       prompt: 'filter by a test name regex pattern',
     };
   }
 
-  onKey(key: string) {
+  onKey(key: string): void {
     this._prompt.put(key);
   }
 

diff --git a/packages/jest-core/src/plugins/test_path_pattern.ts b/packages/jest-core/src/plugins/test_path_pattern.ts
@@ -6,7 +6,12 @@
  */
 
 import type {Config} from '@jest/types';
-import {BaseWatchPlugin, Prompt, UpdateConfigCallback} from 'jest-watcher';
+import {
+  BaseWatchPlugin,
+  Prompt,
+  UpdateConfigCallback,
+  UsageData,
+} from 'jest-watcher';
 import TestPathPatternPrompt from '../TestPathPatternPrompt';
 import activeFilters from '../lib/active_filters_message';
 
@@ -20,14 +25,14 @@ class TestPathPatternPlugin extends BaseWatchPlugin {
     this.isInternal = true;
   }
 
-  getUsageInfo() {
+  getUsageInfo(): UsageData {
     return {
       key: 'p',
       prompt: 'filter by a filename regex pattern',
     };
   }
 
-  onKey(key: string) {
+  onKey(key: string): void {
     this._prompt.put(key);
   }
 

diff --git a/packages/jest-core/src/plugins/update_snapshots.ts b/packages/jest-core/src/plugins/update_snapshots.ts
@@ -10,6 +10,7 @@ import {
   BaseWatchPlugin,
   JestHookSubscriber,
   UpdateConfigCallback,
+  UsageData,
 } from 'jest-watcher';
 
 class UpdateSnapshotsPlugin extends BaseWatchPlugin {
@@ -30,13 +31,13 @@ class UpdateSnapshotsPlugin extends BaseWatchPlugin {
     return Promise.resolve(false);
   }
 
-  apply(hooks: JestHookSubscriber) {
+  apply(hooks: JestHookSubscriber): void {
     hooks.onTestRunComplete(results => {
       this._hasSnapshotFailure = results.snapshot.failure;
     });
   }
 
-  getUsageInfo() {
+  getUsageInfo(): UsageData | null {
     if (this._hasSnapshotFailure) {
       return {
         key: 'u',

diff --git a/packages/jest-core/src/plugins/update_snapshots_interactive.ts b/packages/jest-core/src/plugins/update_snapshots_interactive.ts
@@ -7,7 +7,7 @@
 
 import type {Config} from '@jest/types';
 import type {AggregatedResult, AssertionLocation} from '@jest/test-result';
-import {BaseWatchPlugin, JestHookSubscriber} from 'jest-watcher';
+import {BaseWatchPlugin, JestHookSubscriber, UsageData} from 'jest-watcher';
 import SnapshotInteractiveMode from '../SnapshotInteractiveMode';
 
 class UpdateSnapshotInteractivePlugin extends BaseWatchPlugin {
@@ -41,7 +41,7 @@ class UpdateSnapshotInteractivePlugin extends BaseWatchPlugin {
     return failedTestPaths;
   }
 
-  apply(hooks: JestHookSubscriber) {
+  apply(hooks: JestHookSubscriber): void {
     hooks.onTestRunComplete(results => {
       this._failedSnapshotTestAssertions = this.getFailedSnapshotTestAssertions(
         results,
@@ -52,7 +52,7 @@ class UpdateSnapshotInteractivePlugin extends BaseWatchPlugin {
     });
   }
 
-  onKey(key: string) {
+  onKey(key: string): void {
     if (this._snapshotInteractiveMode.isActive()) {
       this._snapshotInteractiveMode.put(key);
     }
@@ -85,11 +85,8 @@ class UpdateSnapshotInteractivePlugin extends BaseWatchPlugin {
     }
   }
 
-  getUsageInfo() {
-    if (
-      this._failedSnapshotTestAssertions &&
-      this._failedSnapshotTestAssertions.length > 0
-    ) {
+  getUsageInfo(): UsageData | null {
+    if (this._failedSnapshotTestAssertions?.length > 0) {
       return {
         key: 'i',
         prompt: 'update failing snapshots interactively',

diff --git a/packages/jest-diff/src/index.ts b/packages/jest-diff/src/index.ts
@@ -50,6 +50,7 @@ const FALLBACK_FORMAT_OPTIONS_0 = {...FALLBACK_FORMAT_OPTIONS, indent: 0};
 
 // Generate a string that will highlight the difference between two values
 // with green and red. (similar to how github does code diffing)
+// eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
 function diff(a: any, b: any, options?: DiffOptions): string | null {
   if (Object.is(a, b)) {
     return NO_DIFF_MESSAGE;

diff --git a/packages/jest-each/src/index.ts b/packages/jest-each/src/index.ts
@@ -49,8 +49,10 @@ const install = (
   return {describe, fdescribe, fit, it, test, xdescribe, xit, xtest};
 };
 
-const each = (table: Global.EachTable, ...data: Global.TemplateData) =>
-  install(global as Global, table, ...data);
+const each = (
+  table: Global.EachTable,
+  ...data: Global.TemplateData
+): ReturnType<typeof install> => install(global as Global, table, ...data);
 
 each.withGlobal = (g: Global) => (
   table: Global.EachTable,

diff --git a/packages/jest-environment-jsdom/src/index.ts b/packages/jest-environment-jsdom/src/index.ts
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import type {Script} from 'vm';
+import type {Context, Script} from 'vm';
 import type {Config, Global} from '@jest/types';
 import {installCommonGlobals} from 'jest-util';
 import {ModuleMocker} from 'jest-mock';
@@ -135,7 +135,7 @@ class JSDOMEnvironment implements JestEnvironment {
     return null;
   }
 
-  getVmContext() {
+  getVmContext(): Context | null {
     if (this.dom) {
       return this.dom.getInternalVMContext();
     }

diff --git a/packages/jest-haste-map/src/getMockName.ts b/packages/jest-haste-map/src/getMockName.ts
@@ -9,7 +9,7 @@ import * as path from 'path';
 
 const MOCKS_PATTERN = path.sep + '__mocks__' + path.sep;
 
-const getMockName = (filePath: string) => {
+const getMockName = (filePath: string): string => {
   const mockPath = filePath.split(MOCKS_PATTERN)[1];
   return mockPath
     .substring(0, mockPath.lastIndexOf(path.extname(mockPath)))

diff --git a/packages/jest-haste-map/src/lib/normalizePathSep.ts b/packages/jest-haste-map/src/lib/normalizePathSep.ts
@@ -9,9 +9,10 @@ import * as path from 'path';
 
 let normalizePathSep: (string: string) => string;
 if (path.sep === '/') {
-  normalizePathSep = (filePath: string) => filePath;
+  normalizePathSep = (filePath: string): string => filePath;
 } else {
-  normalizePathSep = (filePath: string) => filePath.replace(/\//g, path.sep);
+  normalizePathSep = (filePath: string): string =>
+    filePath.replace(/\//g, path.sep);
 }
 
 export default normalizePathSep;
diff --git a/packages/jest-jasmine2/src/assertionErrorMessage.ts b/packages/jest-jasmine2/src/assertionErrorMessage.ts
@@ -95,7 +95,7 @@ const assertMatcherHint = (
 function assertionErrorMessage(
   error: AssertionErrorWithStack,
   options: DiffOptions,
-) {
+): string {
   const {expected, actual, generatedMessage, message, operator, stack} = error;
   const diffString = diff(expected, actual, options);
   const hasCustomMessage = !generatedMessage;

diff --git a/packages/jest-types/src/Circus.ts b/packages/jest-types/src/Circus.ts
@@ -208,7 +208,7 @@ export type DescribeBlock = {
   tests: Array<TestEntry>;
 };
 
-export type TestError = Exception | Array<[Exception | undefined, Exception]>; // the error from the test, as well as a backup error for async
+export type TestError = Exception | [Exception | undefined, Exception]; // the error from the test, as well as a backup error for async
 
 export type TestEntry = {
   asyncError: Exception; // Used if the test failure contains no usable stack trace

diff --git a/packages/jest-validate/src/validate.ts b/packages/jest-validate/src/validate.ts
@@ -95,7 +95,10 @@ const allowsMultipleTypes = (key: string): boolean => key === 'maxWorkers';
 const isOfTypeStringOrNumber = (value: any): boolean =>
   typeof value === 'number' || typeof value === 'string';
 
-const validate = (config: Record<string, any>, options: ValidationOptions) => {
+const validate = (
+  config: Record<string, any>,
+  options: ValidationOptions,
+): {hasDeprecationWarnings: boolean; isValid: boolean} => {
   hasDeprecationWarnings = false;
 
   // Preserve default blacklist entries even with user-supplied blacklist

diff --git a/packages/jest-watcher/src/BaseWatchPlugin.ts b/packages/jest-watcher/src/BaseWatchPlugin.ts
@@ -28,13 +28,13 @@ class BaseWatchPlugin implements WatchPlugin {
     this._stdout = stdout;
   }
 
-  apply(_hooks: JestHookSubscriber) {}
+  apply(_hooks: JestHookSubscriber): void {}
 
   getUsageInfo(_globalConfig: Config.GlobalConfig): UsageData | null {
     return null;
   }
 
-  onKey(_key: string) {}
+  onKey(_key: string): void {}
 
   run(
     _globalConfig: Config.GlobalConfig,

diff --git a/packages/jest-watcher/src/JestHooks.ts b/packages/jest-watcher/src/JestHooks.ts
@@ -66,8 +66,8 @@ class JestHooks {
     };
   }
 
-  isUsed(hook: AvailableHooks) {
-    return this._listeners[hook] && this._listeners[hook].length;
+  isUsed(hook: AvailableHooks): boolean {
+    return this._listeners[hook]?.length > 0;
   }
 
   getSubscriber(): Readonly<JestHookSubscriber> {

diff --git a/yarn.lock b/yarn.lock
@@ -2779,40 +2779,40 @@
   dependencies:
     "@types/yargs-parser" "*"
 
-"@typescript-eslint/eslint-plugin@^2.19.0":
-  version "2.27.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-2.27.0.tgz#e479cdc4c9cf46f96b4c287755733311b0d0ba4b"
-  integrity sha512-/my+vVHRN7zYgcp0n4z5A6HAK7bvKGBiswaM5zIlOQczsxj/aiD7RcgD+dvVFuwFaGh5+kM7XA6Q6PN0bvb1tw==
+"@typescript-eslint/eslint-plugin@^2.30.0":
+  version "2.30.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-2.30.0.tgz#312a37e80542a764d96e8ad88a105316cdcd7b05"
+  integrity sha512-PGejii0qIZ9Q40RB2jIHyUpRWs1GJuHP1pkoCiaeicfwO9z7Fx03NQzupuyzAmv+q9/gFNHu7lo1ByMXe8PNyg==
   dependencies:
-    "@typescript-eslint/experimental-utils" "2.27.0"
+    "@typescript-eslint/experimental-utils" "2.30.0"
     functional-red-black-tree "^1.0.1"
     regexpp "^3.0.0"
     tsutils "^3.17.1"
 
-"@typescript-eslint/experimental-utils@2.27.0", "@typescript-eslint/experimental-utils@^2.5.0":
-  version "2.27.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-2.27.0.tgz#801a952c10b58e486c9a0b36cf21e2aab1e9e01a"
-  integrity sha512-vOsYzjwJlY6E0NJRXPTeCGqjv5OHgRU1kzxHKWJVPjDYGbPgLudBXjIlc+OD1hDBZ4l1DLbOc5VjofKahsu9Jw==
+"@typescript-eslint/experimental-utils@2.30.0", "@typescript-eslint/experimental-utils@^2.5.0":
+  version "2.30.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-2.30.0.tgz#9845e868c01f3aed66472c561d4b6bac44809dd0"
+  integrity sha512-L3/tS9t+hAHksy8xuorhOzhdefN0ERPDWmR9CclsIGOUqGKy6tqc/P+SoXeJRye5gazkuPO0cK9MQRnolykzkA==
   dependencies:
     "@types/json-schema" "^7.0.3"
-    "@typescript-eslint/typescript-estree" "2.27.0"
+    "@typescript-eslint/typescript-estree" "2.30.0"
     eslint-scope "^5.0.0"
     eslint-utils "^2.0.0"
 
-"@typescript-eslint/parser@^2.19.0":
-  version "2.27.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-2.27.0.tgz#d91664335b2c46584294e42eb4ff35838c427287"
-  integrity sha512-HFUXZY+EdwrJXZo31DW4IS1ujQW3krzlRjBrFRrJcMDh0zCu107/nRfhk/uBasO8m0NVDbBF5WZKcIUMRO7vPg==
+"@typescript-eslint/parser@^2.30.0":
+  version "2.30.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-2.30.0.tgz#7681c305a6f4341ae2579f5e3a75846c29eee9ce"
+  integrity sha512-9kDOxzp0K85UnpmPJqUzdWaCNorYYgk1yZmf4IKzpeTlSAclnFsrLjfwD9mQExctLoLoGAUXq1co+fbr+3HeFw==
   dependencies:
     "@types/eslint-visitor-keys" "^1.0.0"
-    "@typescript-eslint/experimental-utils" "2.27.0"
-    "@typescript-eslint/typescript-estree" "2.27.0"
+    "@typescript-eslint/experimental-utils" "2.30.0"
+    "@typescript-eslint/typescript-estree" "2.30.0"
     eslint-visitor-keys "^1.1.0"
 
-"@typescript-eslint/typescript-estree@2.27.0":
-  version "2.27.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-2.27.0.tgz#a288e54605412da8b81f1660b56c8b2e42966ce8"
-  integrity sha512-t2miCCJIb/FU8yArjAvxllxbTiyNqaXJag7UOpB5DVoM3+xnjeOngtqlJkLRnMtzaRcJhe3CIR9RmL40omubhg==
+"@typescript-eslint/typescript-estree@2.30.0":
+  version "2.30.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-2.30.0.tgz#1b8e848b55144270255ffbfe4c63291f8f766615"
+  integrity sha512-nI5WOechrA0qAhnr+DzqwmqHsx7Ulr/+0H7bWCcClDhhWkSyZR5BmTvnBEyONwJCTWHfc5PAQExX24VD26IAVw==
   dependencies:
     debug "^4.1.1"
     eslint-visitor-keys "^1.1.0"