diff --git a/packages/jest-reporters/src/base_reporter.ts b/packages/jest-reporters/src/BaseReporter.ts
similarity index 100%
rename from packages/jest-reporters/src/base_reporter.ts
rename to packages/jest-reporters/src/BaseReporter.ts
diff --git a/packages/jest-reporters/src/coverage_reporter.ts b/packages/jest-reporters/src/CoverageReporter.ts
similarity index 98%
rename from packages/jest-reporters/src/coverage_reporter.ts
rename to packages/jest-reporters/src/CoverageReporter.ts
index 9e1918bc8726..612cdedaae40 100644
--- a/packages/jest-reporters/src/coverage_reporter.ts
+++ b/packages/jest-reporters/src/CoverageReporter.ts
@@ -25,14 +25,14 @@ import Worker from 'jest-worker';
 import glob = require('glob');
 import v8toIstanbul = require('v8-to-istanbul');
 import type {RawSourceMap} from 'source-map';
-import BaseReporter from './base_reporter';
+import BaseReporter from './BaseReporter';
 import type {
   Context,
   CoverageReporterOptions,
   CoverageWorker,
   Test,
 } from './types';
-import getWatermarks from './get_watermarks';
+import getWatermarks from './getWatermarks';
 
 // This is fixed in a newer versions of source-map, but our dependencies are still stuck on old versions
 interface FixedRawSourceMap extends Omit<RawSourceMap, 'version'> {
@@ -149,9 +149,9 @@ export default class CoverageReporter extends BaseReporter {
     let worker: CoverageWorker | Worker;
 
     if (this._globalConfig.maxWorkers <= 1) {
-      worker = require('./coverage_worker');
+      worker = require('./CoverageWorker');
     } else {
-      worker = new Worker(require.resolve('./coverage_worker'), {
+      worker = new Worker(require.resolve('./CoverageWorker'), {
         exposedMethods: ['worker'],
         maxRetries: 2,
         numWorkers: this._globalConfig.maxWorkers,
diff --git a/packages/jest-reporters/src/coverage_worker.ts b/packages/jest-reporters/src/CoverageWorker.ts
similarity index 100%
rename from packages/jest-reporters/src/coverage_worker.ts
rename to packages/jest-reporters/src/CoverageWorker.ts
diff --git a/packages/jest-reporters/src/default_reporter.ts b/packages/jest-reporters/src/DefaultReporter.ts
similarity index 97%
rename from packages/jest-reporters/src/default_reporter.ts
rename to packages/jest-reporters/src/DefaultReporter.ts
index 7c7f496856f8..d45c07138ab9 100644
--- a/packages/jest-reporters/src/default_reporter.ts
+++ b/packages/jest-reporters/src/DefaultReporter.ts
@@ -16,10 +16,10 @@ import {clearLine, isInteractive} from 'jest-util';
 import {getConsoleOutput} from '@jest/console';
 import chalk = require('chalk');
 import type {ReporterOnStartOptions, Test} from './types';
-import BaseReporter from './base_reporter';
+import BaseReporter from './BaseReporter';
 import Status from './Status';
-import getResultHeader from './get_result_header';
-import getSnapshotStatus from './get_snapshot_status';
+import getResultHeader from './getResultHeader';
+import getSnapshotStatus from './getSnapshotStatus';
 
 type write = NodeJS.WriteStream['write'];
 type FlushBufferedOutput = () => void;
diff --git a/packages/jest-reporters/src/notify_reporter.ts b/packages/jest-reporters/src/NotifyReporter.ts
similarity index 99%
rename from packages/jest-reporters/src/notify_reporter.ts
rename to packages/jest-reporters/src/NotifyReporter.ts
index f6f0bd367924..0c9012282a1c 100644
--- a/packages/jest-reporters/src/notify_reporter.ts
+++ b/packages/jest-reporters/src/NotifyReporter.ts
@@ -12,7 +12,7 @@ import type {Config} from '@jest/types';
 import type {AggregatedResult} from '@jest/test-result';
 import {pluralize} from 'jest-util';
 import type {Context, TestSchedulerContext} from './types';
-import BaseReporter from './base_reporter';
+import BaseReporter from './BaseReporter';
 
 const isDarwin = process.platform === 'darwin';
 
diff --git a/packages/jest-reporters/src/summary_reporter.ts b/packages/jest-reporters/src/SummaryReporter.ts
similarity index 97%
rename from packages/jest-reporters/src/summary_reporter.ts
rename to packages/jest-reporters/src/SummaryReporter.ts
index 73e17cb93087..203b365ead9a 100644
--- a/packages/jest-reporters/src/summary_reporter.ts
+++ b/packages/jest-reporters/src/SummaryReporter.ts
@@ -10,10 +10,10 @@ import type {AggregatedResult, SnapshotSummary} from '@jest/test-result';
 import chalk = require('chalk');
 import {testPathPatternToRegExp} from 'jest-util';
 import type {Context, ReporterOnStartOptions} from './types';
-import BaseReporter from './base_reporter';
+import BaseReporter from './BaseReporter';
 import {getSummary} from './utils';
-import getResultHeader from './get_result_header';
-import getSnapshotSummary from './get_snapshot_summary';
+import getResultHeader from './getResultHeader';
+import getSnapshotSummary from './getSnapshotSummary';
 
 const TEST_SUMMARY_THRESHOLD = 20;
 
diff --git a/packages/jest-reporters/src/verbose_reporter.ts b/packages/jest-reporters/src/VerboseReporter.ts
similarity index 98%
rename from packages/jest-reporters/src/verbose_reporter.ts
rename to packages/jest-reporters/src/VerboseReporter.ts
index 61620532170a..d6c5f986e3b8 100644
--- a/packages/jest-reporters/src/verbose_reporter.ts
+++ b/packages/jest-reporters/src/VerboseReporter.ts
@@ -15,7 +15,7 @@ import type {
 import chalk = require('chalk');
 import {formatTime, specialChars} from 'jest-util';
 import type {Test} from './types';
-import DefaultReporter from './default_reporter';
+import DefaultReporter from './DefaultReporter';
 
 const {ICONS} = specialChars;
 
diff --git a/packages/jest-reporters/src/__tests__/coverage_reporter.test.js b/packages/jest-reporters/src/__tests__/CoverageReporter.test.js
similarity index 99%
rename from packages/jest-reporters/src/__tests__/coverage_reporter.test.js
rename to packages/jest-reporters/src/__tests__/CoverageReporter.test.js
index e15df8cbdd59..1c99e9a9680c 100644
--- a/packages/jest-reporters/src/__tests__/coverage_reporter.test.js
+++ b/packages/jest-reporters/src/__tests__/CoverageReporter.test.js
@@ -26,7 +26,7 @@ import path from 'path';
 import mock from 'mock-fs';
 
 beforeEach(() => {
-  CoverageReporter = require('../coverage_reporter').default;
+  CoverageReporter = require('../CoverageReporter').default;
   libCoverage = require('istanbul-lib-coverage');
   libSourceMaps = require('istanbul-lib-source-maps');
   istanbulReports = require('istanbul-reports');
diff --git a/packages/jest-reporters/src/__tests__/coverage_worker.test.js b/packages/jest-reporters/src/__tests__/CoverageWorker.test.js
similarity index 96%
rename from packages/jest-reporters/src/__tests__/coverage_worker.test.js
rename to packages/jest-reporters/src/__tests__/CoverageWorker.test.js
index 913cf4753c9a..d8b83408f52e 100644
--- a/packages/jest-reporters/src/__tests__/coverage_worker.test.js
+++ b/packages/jest-reporters/src/__tests__/CoverageWorker.test.js
@@ -22,7 +22,7 @@ beforeEach(() => {
 
   fs = require('graceful-fs');
   generateEmptyCoverage = require('../generateEmptyCoverage').default;
-  worker = require('../coverage_worker').worker;
+  worker = require('../CoverageWorker').worker;
 });
 
 test('resolves to the result of generateEmptyCoverage upon success', async () => {
diff --git a/packages/jest-reporters/src/__tests__/default_reporter.test.js b/packages/jest-reporters/src/__tests__/DefaultReporter.test.js
similarity index 97%
rename from packages/jest-reporters/src/__tests__/default_reporter.test.js
rename to packages/jest-reporters/src/__tests__/DefaultReporter.test.js
index c714842eb3a9..8bf82aacb72f 100644
--- a/packages/jest-reporters/src/__tests__/default_reporter.test.js
+++ b/packages/jest-reporters/src/__tests__/DefaultReporter.test.js
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import DefaultReporter from '../default_reporter';
+import DefaultReporter from '../DefaultReporter';
 
 jest.mock('jest-util', () => ({
   ...jest.requireActual('jest-util'),
diff --git a/packages/jest-reporters/src/__tests__/notify_reporter.test.ts b/packages/jest-reporters/src/__tests__/NotifyReporter.test.ts
similarity index 98%
rename from packages/jest-reporters/src/__tests__/notify_reporter.test.ts
rename to packages/jest-reporters/src/__tests__/NotifyReporter.test.ts
index 3e0e112a48d0..137a264483d1 100644
--- a/packages/jest-reporters/src/__tests__/notify_reporter.test.ts
+++ b/packages/jest-reporters/src/__tests__/NotifyReporter.test.ts
@@ -8,10 +8,10 @@
 import type {AggregatedResult} from '@jest/test-result';
 import type {Config} from '@jest/types';
 import Resolver from 'jest-resolve';
-import NotifyReporter from '../notify_reporter';
+import NotifyReporter from '../NotifyReporter';
 import {makeGlobalConfig} from '../../../../TestUtils';
 
-jest.mock('../default_reporter');
+jest.mock('../DefaultReporter');
 jest.mock('node-notifier', () => ({
   notify: jest.fn(),
 }));
diff --git a/packages/jest-reporters/src/__tests__/summary_reporter.test.js b/packages/jest-reporters/src/__tests__/SummaryReporter.test.js
similarity index 98%
rename from packages/jest-reporters/src/__tests__/summary_reporter.test.js
rename to packages/jest-reporters/src/__tests__/SummaryReporter.test.js
index ead47477fc61..118f21f58a89 100644
--- a/packages/jest-reporters/src/__tests__/summary_reporter.test.js
+++ b/packages/jest-reporters/src/__tests__/SummaryReporter.test.js
@@ -20,7 +20,7 @@ let results = [];
 
 function requireReporter() {
   jest.isolateModules(() => {
-    SummaryReporter = require('../summary_reporter').default;
+    SummaryReporter = require('../SummaryReporter').default;
   });
 }
 
diff --git a/packages/jest-reporters/src/__tests__/verbose_reporter.test.js b/packages/jest-reporters/src/__tests__/VerboseReporter.test.js
similarity index 99%
rename from packages/jest-reporters/src/__tests__/verbose_reporter.test.js
rename to packages/jest-reporters/src/__tests__/VerboseReporter.test.js
index a13f6bd614bb..21aab8862b4a 100644
--- a/packages/jest-reporters/src/__tests__/verbose_reporter.test.js
+++ b/packages/jest-reporters/src/__tests__/VerboseReporter.test.js
@@ -12,7 +12,7 @@ const wrap = obj => ({suites: obj, tests: [], title: ''});
 let groupTestsBySuites;
 
 beforeEach(() => {
-  const VerboseReporter = require('../verbose_reporter').default;
+  const VerboseReporter = require('../VerboseReporter').default;
   groupTestsBySuites = VerboseReporter.groupTestsBySuites;
 });
 
diff --git a/packages/jest-reporters/src/__tests__/__snapshots__/notify_reporter.test.ts.snap b/packages/jest-reporters/src/__tests__/__snapshots__/NotifyReporter.test.ts.snap
similarity index 100%
rename from packages/jest-reporters/src/__tests__/__snapshots__/notify_reporter.test.ts.snap
rename to packages/jest-reporters/src/__tests__/__snapshots__/NotifyReporter.test.ts.snap
diff --git a/packages/jest-reporters/src/__tests__/__snapshots__/summary_reporter.test.js.snap b/packages/jest-reporters/src/__tests__/__snapshots__/SummaryReporter.test.js.snap
similarity index 100%
rename from packages/jest-reporters/src/__tests__/__snapshots__/summary_reporter.test.js.snap
rename to packages/jest-reporters/src/__tests__/__snapshots__/SummaryReporter.test.js.snap
diff --git a/packages/jest-reporters/src/__tests__/__snapshots__/get_snapshot_status.test.js.snap b/packages/jest-reporters/src/__tests__/__snapshots__/getSnapshotStatus.test.js.snap
similarity index 100%
rename from packages/jest-reporters/src/__tests__/__snapshots__/get_snapshot_status.test.js.snap
rename to packages/jest-reporters/src/__tests__/__snapshots__/getSnapshotStatus.test.js.snap
diff --git a/packages/jest-reporters/src/__tests__/__snapshots__/get_snapshot_summary.test.js.snap b/packages/jest-reporters/src/__tests__/__snapshots__/getSnapshotSummary.test.js.snap
similarity index 100%
rename from packages/jest-reporters/src/__tests__/__snapshots__/get_snapshot_summary.test.js.snap
rename to packages/jest-reporters/src/__tests__/__snapshots__/getSnapshotSummary.test.js.snap
diff --git a/packages/jest-reporters/src/__tests__/get_result_header.test.js b/packages/jest-reporters/src/__tests__/getResultHeader.test.js
similarity index 97%
rename from packages/jest-reporters/src/__tests__/get_result_header.test.js
rename to packages/jest-reporters/src/__tests__/getResultHeader.test.js
index a15a4e3df424..c4703f85e783 100644
--- a/packages/jest-reporters/src/__tests__/get_result_header.test.js
+++ b/packages/jest-reporters/src/__tests__/getResultHeader.test.js
@@ -6,7 +6,7 @@
  */
 
 import {makeGlobalConfig} from '../../../../TestUtils';
-import getResultHeader from '../get_result_header';
+import getResultHeader from '../getResultHeader';
 const terminalLink = require('terminal-link');
 
 jest.mock('terminal-link', () => jest.fn(() => 'wannabehyperlink'));
diff --git a/packages/jest-reporters/src/__tests__/get_snapshot_status.test.js b/packages/jest-reporters/src/__tests__/getSnapshotStatus.test.js
similarity index 95%
rename from packages/jest-reporters/src/__tests__/get_snapshot_status.test.js
rename to packages/jest-reporters/src/__tests__/getSnapshotStatus.test.js
index dbbaee15773b..cffbad6e24c4 100644
--- a/packages/jest-reporters/src/__tests__/get_snapshot_status.test.js
+++ b/packages/jest-reporters/src/__tests__/getSnapshotStatus.test.js
@@ -7,7 +7,7 @@
 
 'use strict';
 
-import getSnapshotStatus from '../get_snapshot_status';
+import getSnapshotStatus from '../getSnapshotStatus';
 
 test('Retrieves the snapshot status', () => {
   const snapshotResult = {
diff --git a/packages/jest-reporters/src/__tests__/get_snapshot_summary.test.js b/packages/jest-reporters/src/__tests__/getSnapshotSummary.test.js
similarity index 97%
rename from packages/jest-reporters/src/__tests__/get_snapshot_summary.test.js
rename to packages/jest-reporters/src/__tests__/getSnapshotSummary.test.js
index fb76b156b1e2..7814c335abb2 100644
--- a/packages/jest-reporters/src/__tests__/get_snapshot_summary.test.js
+++ b/packages/jest-reporters/src/__tests__/getSnapshotSummary.test.js
@@ -7,7 +7,7 @@
 
 'use strict';
 
-import getSnapshotSummary from '../get_snapshot_summary';
+import getSnapshotSummary from '../getSnapshotSummary';
 
 const UPDATE_COMMAND = 'press --u';
 
diff --git a/packages/jest-reporters/src/__tests__/get_watermarks.test.ts b/packages/jest-reporters/src/__tests__/getWatermarks.test.ts
similarity index 96%
rename from packages/jest-reporters/src/__tests__/get_watermarks.test.ts
rename to packages/jest-reporters/src/__tests__/getWatermarks.test.ts
index 2b47c5159e09..9e4f67341e47 100644
--- a/packages/jest-reporters/src/__tests__/get_watermarks.test.ts
+++ b/packages/jest-reporters/src/__tests__/getWatermarks.test.ts
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import getWatermarks from '../get_watermarks';
+import getWatermarks from '../getWatermarks';
 import {makeGlobalConfig} from '../../../../TestUtils';
 
 describe('getWatermarks', () => {
diff --git a/packages/jest-reporters/src/get_result_header.ts b/packages/jest-reporters/src/getResultHeader.ts
similarity index 100%
rename from packages/jest-reporters/src/get_result_header.ts
rename to packages/jest-reporters/src/getResultHeader.ts
diff --git a/packages/jest-reporters/src/get_snapshot_status.ts b/packages/jest-reporters/src/getSnapshotStatus.ts
similarity index 100%
rename from packages/jest-reporters/src/get_snapshot_status.ts
rename to packages/jest-reporters/src/getSnapshotStatus.ts
diff --git a/packages/jest-reporters/src/get_snapshot_summary.ts b/packages/jest-reporters/src/getSnapshotSummary.ts
similarity index 100%
rename from packages/jest-reporters/src/get_snapshot_summary.ts
rename to packages/jest-reporters/src/getSnapshotSummary.ts
diff --git a/packages/jest-reporters/src/get_watermarks.ts b/packages/jest-reporters/src/getWatermarks.ts
similarity index 100%
rename from packages/jest-reporters/src/get_watermarks.ts
rename to packages/jest-reporters/src/getWatermarks.ts
diff --git a/packages/jest-reporters/src/index.ts b/packages/jest-reporters/src/index.ts
index 53c9b8f811c7..d201fbd481f3 100644
--- a/packages/jest-reporters/src/index.ts
+++ b/packages/jest-reporters/src/index.ts
@@ -18,12 +18,12 @@ export type {
   SnapshotSummary,
   TestResult,
 } from '@jest/test-result';
-export {default as BaseReporter} from './base_reporter';
-export {default as CoverageReporter} from './coverage_reporter';
-export {default as DefaultReporter} from './default_reporter';
-export {default as NotifyReporter} from './notify_reporter';
-export {default as SummaryReporter} from './summary_reporter';
-export {default as VerboseReporter} from './verbose_reporter';
+export {default as BaseReporter} from './BaseReporter';
+export {default as CoverageReporter} from './CoverageReporter';
+export {default as DefaultReporter} from './DefaultReporter';
+export {default as NotifyReporter} from './NotifyReporter';
+export {default as SummaryReporter} from './SummaryReporter';
+export {default as VerboseReporter} from './VerboseReporter';
 export type {
   Context,
   Reporter,
diff --git a/packages/jest-reporters/src/types.ts b/packages/jest-reporters/src/types.ts
index 45dc7c5c00f6..2add1587a315 100644
--- a/packages/jest-reporters/src/types.ts
+++ b/packages/jest-reporters/src/types.ts
@@ -14,7 +14,7 @@ import type {
 } from '@jest/test-result';
 import type {FS as HasteFS, ModuleMap} from 'jest-haste-map';
 import type {ResolverType} from 'jest-resolve';
-import type {worker} from './coverage_worker';
+import type {worker} from './CoverageWorker';
 
 export type ReporterOnStartOptions = {
   estimatedTime: number;