diff --git a/.eslintrc.js b/.eslintrc.js
index 32f59c4d6b3db5..2c49bf78c67b16 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -64,63 +64,63 @@ module.exports = {
      * Temporarily disable some react rules for specific plugins, remove in separate PRs
      */
     {
-      files: ['packages/kbn-ui-framework/**/*.{js,ts,tsx}'],
+      files: ['packages/kbn-ui-framework/**/*.{js,mjs,ts,tsx}'],
       rules: {
         'jsx-a11y/no-onchange': 'off',
       },
     },
     {
-      files: ['src/plugins/es_ui_shared/**/*.{js,ts,tsx}'],
+      files: ['src/plugins/es_ui_shared/**/*.{js,mjs,ts,tsx}'],
       rules: {
         'react-hooks/exhaustive-deps': 'off',
       },
     },
     {
-      files: ['src/plugins/kibana_react/**/*.{js,ts,tsx}'],
+      files: ['src/plugins/kibana_react/**/*.{js,mjs,ts,tsx}'],
       rules: {
         'react-hooks/rules-of-hooks': 'off',
         'react-hooks/exhaustive-deps': 'off',
       },
     },
     {
-      files: ['src/plugins/kibana_utils/**/*.{js,ts,tsx}'],
+      files: ['src/plugins/kibana_utils/**/*.{js,mjs,ts,tsx}'],
       rules: {
         'react-hooks/exhaustive-deps': 'off',
       },
     },
     {
-      files: ['x-pack/plugins/canvas/**/*.{js,ts,tsx}'],
+      files: ['x-pack/plugins/canvas/**/*.{js,mjs,ts,tsx}'],
       rules: {
         'jsx-a11y/click-events-have-key-events': 'off',
       },
     },
     {
-      files: ['x-pack/plugins/cross_cluster_replication/**/*.{js,ts,tsx}'],
+      files: ['x-pack/plugins/cross_cluster_replication/**/*.{js,mjs,ts,tsx}'],
       rules: {
         'jsx-a11y/click-events-have-key-events': 'off',
       },
     },
     {
-      files: ['x-pack/legacy/plugins/index_management/**/*.{js,ts,tsx}'],
+      files: ['x-pack/legacy/plugins/index_management/**/*.{js,mjs,ts,tsx}'],
       rules: {
         'react-hooks/exhaustive-deps': 'off',
         'react-hooks/rules-of-hooks': 'off',
       },
     },
     {
-      files: ['x-pack/plugins/lens/**/*.{js,ts,tsx}'],
+      files: ['x-pack/plugins/lens/**/*.{js,mjs,ts,tsx}'],
       rules: {
         'react-hooks/exhaustive-deps': 'off',
       },
     },
     {
-      files: ['x-pack/plugins/ml/**/*.{js,ts,tsx}'],
+      files: ['x-pack/plugins/ml/**/*.{js,mjs,ts,tsx}'],
       rules: {
         'react-hooks/exhaustive-deps': 'off',
       },
     },
     {
-      files: ['x-pack/legacy/plugins/snapshot_restore/**/*.{js,ts,tsx}'],
+      files: ['x-pack/legacy/plugins/snapshot_restore/**/*.{js,mjs,ts,tsx}'],
       rules: {
         'react-hooks/exhaustive-deps': 'off',
       },
@@ -132,7 +132,7 @@ module.exports = {
      * Licence headers
      */
     {
-      files: ['**/*.{js,ts,tsx}', '!plugins/**/*'],
+      files: ['**/*.{js,mjs,ts,tsx}', '!plugins/**/*'],
       rules: {
         '@kbn/eslint/require-license-header': [
           'error',
@@ -153,7 +153,7 @@ module.exports = {
      * New Platform client-side
      */
     {
-      files: ['{src,x-pack}/plugins/*/public/**/*.{js,ts,tsx}'],
+      files: ['{src,x-pack}/plugins/*/public/**/*.{js,mjs,ts,tsx}'],
       rules: {
         'import/no-commonjs': 'error',
       },
@@ -163,7 +163,7 @@ module.exports = {
      * Files that require Elastic license headers instead of Apache 2.0 header
      */
     {
-      files: ['x-pack/**/*.{js,ts,tsx}'],
+      files: ['x-pack/**/*.{js,mjs,ts,tsx}'],
       rules: {
         '@kbn/eslint/require-license-header': [
           'error',
@@ -184,7 +184,7 @@ module.exports = {
      * Restricted paths
      */
     {
-      files: ['**/*.{js,ts,tsx}'],
+      files: ['**/*.{js,mjs,ts,tsx}'],
       rules: {
         '@kbn/eslint/no-restricted-paths': [
           'error',
@@ -251,8 +251,8 @@ module.exports = {
                 ],
                 from: [
                   '(src|x-pack)/plugins/**/(public|server)/**/*',
-                  '!(src|x-pack)/plugins/**/(public|server)/mocks/index.{js,ts}',
-                  '!(src|x-pack)/plugins/**/(public|server)/(index|mocks).{js,ts,tsx}',
+                  '!(src|x-pack)/plugins/**/(public|server)/mocks/index.{js,mjs,ts}',
+                  '!(src|x-pack)/plugins/**/(public|server)/(index|mocks).{js,mjs,ts,tsx}',
                 ],
                 allowSameFolder: true,
                 errorMessage: 'Plugins may only import from top-level public and server modules.',
@@ -264,11 +264,11 @@ module.exports = {
 
                   'src/legacy/core_plugins/**/*',
                   '!src/legacy/core_plugins/**/server/**/*',
-                  '!src/legacy/core_plugins/**/index.{js,ts,tsx}',
+                  '!src/legacy/core_plugins/**/index.{js,mjs,ts,tsx}',
 
                   'x-pack/legacy/plugins/**/*',
                   '!x-pack/legacy/plugins/**/server/**/*',
-                  '!x-pack/legacy/plugins/**/index.{js,ts,tsx}',
+                  '!x-pack/legacy/plugins/**/index.{js,mjs,ts,tsx}',
 
                   'examples/**/*',
                   '!examples/**/server/**/*',
@@ -530,7 +530,7 @@ module.exports = {
      * Jest specific rules
      */
     {
-      files: ['**/*.test.{js,ts,tsx}'],
+      files: ['**/*.test.{js,mjs,ts,tsx}'],
       rules: {
         'jest/valid-describe': 'error',
       },
@@ -595,8 +595,8 @@ module.exports = {
     {
       // front end and common typescript and javascript files only
       files: [
-        'x-pack/plugins/security_solution/public/**/*.{js,ts,tsx}',
-        'x-pack/plugins/security_solution/common/**/*.{js,ts,tsx}',
+        'x-pack/plugins/security_solution/public/**/*.{js,mjs,ts,tsx}',
+        'x-pack/plugins/security_solution/common/**/*.{js,mjs,ts,tsx}',
       ],
       rules: {
         'import/no-nodejs-modules': 'error',
@@ -646,7 +646,7 @@ module.exports = {
     // {
     //   // will introduced after the other warns are fixed
     //   // typescript and javascript for front end react performance
-    //   files: ['x-pack/plugins/security_solution/public/**/!(*.test).{js,ts,tsx}'],
+    //   files: ['x-pack/plugins/security_solution/public/**/!(*.test).{js,mjs,ts,tsx}'],
     //   plugins: ['react-perf'],
     //   rules: {
     //     // 'react-perf/jsx-no-new-object-as-prop': 'error',
@@ -657,7 +657,7 @@ module.exports = {
     // },
     {
       // typescript and javascript for front and back end
-      files: ['x-pack/{,legacy/}plugins/security_solution/**/*.{js,ts,tsx}'],
+      files: ['x-pack/{,legacy/}plugins/security_solution/**/*.{js,mjs,ts,tsx}'],
       plugins: ['eslint-plugin-node', 'react'],
       env: {
         mocha: true,
@@ -776,8 +776,8 @@ module.exports = {
     {
       // front end and common typescript and javascript files only
       files: [
-        'x-pack/plugins/lists/public/**/*.{js,ts,tsx}',
-        'x-pack/plugins/lists/common/**/*.{js,ts,tsx}',
+        'x-pack/plugins/lists/public/**/*.{js,mjs,ts,tsx}',
+        'x-pack/plugins/lists/common/**/*.{js,mjs,ts,tsx}',
       ],
       rules: {
         'import/no-nodejs-modules': 'error',
@@ -792,7 +792,7 @@ module.exports = {
     },
     {
       // typescript and javascript for front and back end
-      files: ['x-pack/plugins/lists/**/*.{js,ts,tsx}'],
+      files: ['x-pack/plugins/lists/**/*.{js,mjs,ts,tsx}'],
       plugins: ['eslint-plugin-node'],
       env: {
         mocha: true,
@@ -1020,8 +1020,8 @@ module.exports = {
      */
     {
       files: [
-        'src/plugins/vis_type_timeseries/**/*.{js,ts,tsx}',
-        'src/legacy/core_plugins/vis_type_timeseries/**/*.{js,ts,tsx}',
+        'src/plugins/vis_type_timeseries/**/*.{js,mjs,ts,tsx}',
+        'src/legacy/core_plugins/vis_type_timeseries/**/*.{js,mjs,ts,tsx}',
       ],
       rules: {
         'import/no-default-export': 'error',
diff --git a/docs/developer/core/development-unit-tests.asciidoc b/docs/developer/core/development-unit-tests.asciidoc
index a738e2cf372d97..04cce0dfec901d 100644
--- a/docs/developer/core/development-unit-tests.asciidoc
+++ b/docs/developer/core/development-unit-tests.asciidoc
@@ -22,7 +22,7 @@ yarn test:mocha
 
 [float]
 ==== Jest
-Jest tests are stored in the same directory as source code files with the `.test.{js,ts,tsx}` suffix.
+Jest tests are stored in the same directory as source code files with the `.test.{js,mjs,ts,tsx}` suffix.
 
 *Running Jest Unit Tests*
 
diff --git a/packages/eslint-config-kibana/jest.js b/packages/eslint-config-kibana/jest.js
index d682277ff905a4..c374de7ae123ca 100644
--- a/packages/eslint-config-kibana/jest.js
+++ b/packages/eslint-config-kibana/jest.js
@@ -2,8 +2,8 @@ module.exports = {
   overrides: [
     {
       files: [
-        '**/*.{test,test.mocks,mock}.{js,ts,tsx}',
-        '**/__mocks__/**/*.{js,ts,tsx}',
+        '**/*.{test,test.mocks,mock}.{js,mjs,ts,tsx}',
+        '**/__mocks__/**/*.{js,mjs,ts,tsx}',
       ],
       plugins: [
         'jest',
diff --git a/src/dev/jest/config.js b/src/dev/jest/config.js
index da343aa0f0672d..391a52b7f0397b 100644
--- a/src/dev/jest/config.js
+++ b/src/dev/jest/config.js
@@ -50,7 +50,7 @@ export default {
     'packages/kbn-ui-framework/src/services/**/*.js',
     '!packages/kbn-ui-framework/src/services/index.js',
     '!packages/kbn-ui-framework/src/services/**/*/index.js',
-    'src/legacy/core_plugins/**/*.{js,jsx,ts,tsx}',
+    'src/legacy/core_plugins/**/*.{js,mjs,jsx,ts,tsx}',
     '!src/legacy/core_plugins/**/{__test__,__snapshots__}/**/*',
     '!src/legacy/core_plugins/tests_bundle/**',
   ],
@@ -81,7 +81,7 @@ export default {
   ],
   coverageDirectory: '<rootDir>/target/kibana-coverage/jest',
   coverageReporters: !!process.env.CODE_COVERAGE ? ['json'] : ['html', 'text'],
-  moduleFileExtensions: ['js', 'json', 'ts', 'tsx', 'node'],
+  moduleFileExtensions: ['js', 'mjs', 'json', 'ts', 'tsx', 'node'],
   modulePathIgnorePatterns: ['__fixtures__/', 'target/'],
   testEnvironment: 'jest-environment-jsdom-thirteen',
   testMatch: ['**/*.test.{js,ts,tsx}'],
diff --git a/src/dev/run_eslint.js b/src/dev/run_eslint.js
index 3bfbb9cc876e06..3214a2fb454711 100644
--- a/src/dev/run_eslint.js
+++ b/src/dev/run_eslint.js
@@ -31,7 +31,7 @@ if (!process.argv.includes('--no-cache')) {
 }
 
 if (!process.argv.includes('--ext')) {
-  process.argv.push('--ext', '.js,.ts,.tsx');
+  process.argv.push('--ext', '.js,.mjs,.ts,.tsx');
 }
 
 // common-js is required so that logic before this executes before loading eslint
diff --git a/x-pack/dev-tools/jest/create_jest_config.js b/x-pack/dev-tools/jest/create_jest_config.js
index 9b6db8b74458b5..a0574dbdf36da6 100644
--- a/x-pack/dev-tools/jest/create_jest_config.js
+++ b/x-pack/dev-tools/jest/create_jest_config.js
@@ -9,7 +9,7 @@ export function createJestConfig({ kibanaDirectory, rootDir, xPackKibanaDirector
   return {
     rootDir,
     roots: ['<rootDir>/plugins', '<rootDir>/legacy/plugins', '<rootDir>/legacy/server'],
-    moduleFileExtensions: ['js', 'json', 'ts', 'tsx', 'node'],
+    moduleFileExtensions: ['js', 'mjs', 'json', 'ts', 'tsx', 'node'],
     moduleNameMapper: {
       '@elastic/eui$': `${kibanaDirectory}/node_modules/@elastic/eui/test-env`,
       '@elastic/eui/lib/(.*)?': `${kibanaDirectory}/node_modules/@elastic/eui/test-env/$1`,
@@ -32,11 +32,11 @@ export function createJestConfig({ kibanaDirectory, rootDir, xPackKibanaDirector
       '^(!!)?file-loader!': fileMockPath,
     },
     collectCoverageFrom: [
-      'legacy/plugins/**/*.{js,jsx,ts,tsx}',
-      'legacy/server/**/*.{js,jsx,ts,tsx}',
-      'plugins/**/*.{js,jsx,ts,tsx}',
+      'legacy/plugins/**/*.{js,mjs,jsx,ts,tsx}',
+      'legacy/server/**/*.{js,mjs,jsx,ts,tsx}',
+      'plugins/**/*.{js,mjs,jsx,ts,tsx}',
       '!**/{__test__,__snapshots__,__examples__,integration_tests,tests}/**',
-      '!**/*.test.{js,ts,tsx}',
+      '!**/*.test.{js,mjs,ts,tsx}',
       '!**/flot-charts/**',
       '!**/test/**',
       '!**/build/**',
@@ -60,7 +60,7 @@ export function createJestConfig({ kibanaDirectory, rootDir, xPackKibanaDirector
       `${kibanaDirectory}/src/dev/jest/setup/react_testing_library.js`,
     ],
     testEnvironment: 'jest-environment-jsdom-thirteen',
-    testMatch: ['**/*.test.{js,ts,tsx}'],
+    testMatch: ['**/*.test.{js,mjs,ts,tsx}'],
     testRunner: 'jest-circus/runner',
     transform: {
       '^.+\\.(js|tsx?)$': `${kibanaDirectory}/src/dev/jest/babel_transform.js`,
diff --git a/x-pack/plugins/apm/jest.config.js b/x-pack/plugins/apm/jest.config.js
index 43bdeb583c819e..2f9d8a37376d96 100644
--- a/x-pack/plugins/apm/jest.config.js
+++ b/x-pack/plugins/apm/jest.config.js
@@ -29,10 +29,10 @@ module.exports = {
   roots: [`${rootDir}/common`, `${rootDir}/public`, `${rootDir}/server`],
   collectCoverage: true,
   collectCoverageFrom: [
-    '**/*.{js,jsx,ts,tsx}',
+    '**/*.{js,mjs,jsx,ts,tsx}',
     '!**/{__test__,__snapshots__,__examples__,integration_tests,tests}/**',
-    '!**/*.stories.{js,ts,tsx}',
-    '!**/*.test.{js,ts,tsx}',
+    '!**/*.stories.{js,mjs,ts,tsx}',
+    '!**/*.test.{js,mjs,ts,tsx}',
     '!**/dev_docs/**',
     '!**/e2e/**',
     '!**/scripts/**',
diff --git a/x-pack/test_utils/jest/config.integration.js b/x-pack/test_utils/jest/config.integration.js
index 033c948c3c0343..03917d34ab09ca 100644
--- a/x-pack/test_utils/jest/config.integration.js
+++ b/x-pack/test_utils/jest/config.integration.js
@@ -10,9 +10,9 @@ import config from './config';
 export default {
   ...config,
   testMatch: [
-    `**/${RESERVED_DIR_JEST_INTEGRATION_TESTS}/**/*.test.{js,ts,tsx}`,
+    `**/${RESERVED_DIR_JEST_INTEGRATION_TESTS}/**/*.test.{js,mjs,ts,tsx}`,
     // Tests within `__jest__` directories should be treated as regular unit tests.
-    `!**/__jest__/${RESERVED_DIR_JEST_INTEGRATION_TESTS}/**/*.test.{js,ts,tsx}`,
+    `!**/__jest__/${RESERVED_DIR_JEST_INTEGRATION_TESTS}/**/*.test.{js,mjs,ts,tsx}`,
   ],
   testPathIgnorePatterns: config.testPathIgnorePatterns.filter(
     (pattern) => !pattern.includes(RESERVED_DIR_JEST_INTEGRATION_TESTS)
diff --git a/x-pack/test_utils/jest/config.js b/x-pack/test_utils/jest/config.js
index adee510ef28467..7bb073023b7f8b 100644
--- a/x-pack/test_utils/jest/config.js
+++ b/x-pack/test_utils/jest/config.js
@@ -29,10 +29,10 @@ export default {
   ],
   coverageDirectory: '<rootDir>/../target/kibana-coverage/jest',
   coverageReporters: ['html'],
-  moduleFileExtensions: ['js', 'json', 'ts', 'tsx', 'node'],
+  moduleFileExtensions: ['js', 'mjs', 'json', 'ts', 'tsx', 'node'],
   modulePathIgnorePatterns: ['__fixtures__/', 'target/'],
   testEnvironment: 'jest-environment-jsdom-thirteen',
-  testMatch: ['**/*.test.{js,ts,tsx}'],
+  testMatch: ['**/*.test.{js,mjs,ts,tsx}'],
   testPathIgnorePatterns: [
     '<rootDir>/packages/kbn-ui-framework/(dist|doc_site|generator-kui)/',
     '<rootDir>/packages/kbn-pm/dist/',