diff --git a/.eslintrc.cjs b/.eslintrc.cjs
index a5cb75ff9d8..cf0f611caf8 100644
--- a/.eslintrc.cjs
+++ b/.eslintrc.cjs
@@ -80,6 +80,12 @@ module.exports = defineConfig({
         trailingUnderscore: 'forbid',
       },
     ],
+    '@typescript-eslint/no-confusing-void-expression': [
+      'error',
+      {
+        ignoreArrowShorthand: true,
+      },
+    ],
     '@typescript-eslint/no-inferrable-types': [
       'error',
       { ignoreParameters: true },
@@ -114,10 +120,6 @@ module.exports = defineConfig({
     '@typescript-eslint/unbound-method': 'off',
     '@typescript-eslint/unified-signatures': 'off', // incompatible with our api docs generation
 
-    // TODO @ST-DDT 2023-10-10: The following rules currently conflict with our code.
-    // Each rule should be checked whether it should be enabled/configured and the problems fixed, or stay disabled permanently.
-    '@typescript-eslint/no-confusing-void-expression': 'off',
-
     'jsdoc/require-jsdoc': 'off', // Enabled only for src/**/*.ts
     'jsdoc/require-returns': 'off',
     'jsdoc/sort-tags': [
@@ -164,12 +166,6 @@ module.exports = defineConfig({
           'error',
           {
             case: 'snakeCase',
-            // TODO @ST-DDT 2023-10-21: rename the definitions in v9
-            ignore: [
-              /chemicalElement\.ts$/,
-              /directoryPaths\.ts$/,
-              /mimeTypes\.ts$/,
-            ],
           },
         ],
         'unicorn/text-encoding-identifier-case': 'off',
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fe0ad5cea5a..627992e4dde 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        node_version: [18, 20]
+        node_version: [18, 20, 22]
       fail-fast: false
     timeout-minutes: 10
 
@@ -122,7 +122,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     timeout-minutes: 10
-    name: 'Lint: node-20, ubuntu-latest'
+    name: 'Lint: node-22, ubuntu-latest'
     steps:
       - name: Checkout
         uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
@@ -132,10 +132,10 @@ jobs:
       - name: Install pnpm
         uses: pnpm/action-setup@fe02b34f77f8bc703788d5817da081398fad5dd2 # v4.0.0
 
-      - name: Set node version to 20
+      - name: Set node version to 22
         uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
         with:
-          node-version: 20
+          node-version: 22
           cache: 'pnpm'
 
       - name: Install deps
@@ -152,7 +152,7 @@ jobs:
   ts-check:
     runs-on: ubuntu-latest
     timeout-minutes: 10
-    name: 'TS-Check: node-20, ubuntu-latest'
+    name: 'TS-Check: node-22, ubuntu-latest'
     steps:
       - name: Checkout
         uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
@@ -162,10 +162,10 @@ jobs:
       - name: Install pnpm
         uses: pnpm/action-setup@fe02b34f77f8bc703788d5817da081398fad5dd2 # v4.0.0
 
-      - name: Set node version to 20
+      - name: Set node version to 22
         uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
         with:
-          node-version: 20
+          node-version: 22
           cache: 'pnpm'
 
       - name: Install deps
@@ -182,7 +182,7 @@ jobs:
   codecov:
     runs-on: ubuntu-latest
     timeout-minutes: 10
-    name: 'Codecov: node-20, ubuntu-latest'
+    name: 'Codecov: node-22, ubuntu-latest'
     steps:
       - name: Checkout
         uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
@@ -192,10 +192,10 @@ jobs:
       - name: Install pnpm
         uses: pnpm/action-setup@fe02b34f77f8bc703788d5817da081398fad5dd2 # v4.0.0
 
-      - name: Set node version to 20
+      - name: Set node version to 22
         uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
         with:
-          node-version: 20
+          node-version: 22
           cache: 'pnpm'
 
       - name: Install deps
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 1b36e8e7502..7c631d13c5b 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -10,7 +10,7 @@ jobs:
   check-code-generation:
     runs-on: ubuntu-latest
     timeout-minutes: 10
-    name: 'Check Code Generation: node-20, ubuntu-latest'
+    name: 'Check Code Generation: node-22, ubuntu-latest'
     permissions:
       pull-requests: write
     steps:
@@ -22,10 +22,10 @@ jobs:
       - name: Install pnpm
         uses: pnpm/action-setup@fe02b34f77f8bc703788d5817da081398fad5dd2 # v4.0.0
 
-      - name: Set node version to 20
+      - name: Set node version to 22
         uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
         with:
-          node-version: 20
+          node-version: 22
           cache: 'pnpm'
 
       - name: Install deps
diff --git a/docs/guide/upgrading.md b/docs/guide/upgrading.md
index 1981c501276..653570b6eba 100644
--- a/docs/guide/upgrading.md
+++ b/docs/guide/upgrading.md
@@ -480,6 +480,28 @@ Renamed deprecated locale aliases `cz`, `en_IND`, `ge` and removed `global`.
 | `import { faker } from '@faker-js/faker/locale/ge'`     | `import { faker } from '@faker-js/faker/locale/ka_GE'` |
 | `import { faker } from '@faker-js/faker/locale/global'` | `import { faker } from '@faker-js/faker/locale/base'`  |
 
+### Renamed Locale Definitions
+
+The following locale definitions have been renamed
+
+| old                                         | replacement                                  |
+| ------------------------------------------- | -------------------------------------------- |
+| `faker.definitions.science.chemicalElement` | `faker.definitions.science.chemical_element` |
+| `faker.definitions.system.directoryPaths`   | `faker.definitions.system.directory_paths`   |
+| `faker.definitions.system.mimeTypes`        | `faker.definitions.system.mime_types`        |
+
+With that now all our locale data use the following naming scheme:
+
+```txt
+faker.definitions.category_name.entry_name
+```
+
+Please keep in mind that property keys of complex objects remain in camel-case.
+
+```txt
+faker.definitions.science.chemical_element.atomicNumber
+```
+
 ### Type Aliases
 
 Removed deprecated type aliases
diff --git a/scripts/generate-locales.ts b/scripts/generate-locales.ts
index 41b2e108e1f..933215a1ed3 100644
--- a/scripts/generate-locales.ts
+++ b/scripts/generate-locales.ts
@@ -312,7 +312,6 @@ async function normalizeLocaleFile(filePath: string, definitionKey: string) {
 
   const legacyDefinitions = ['app', 'cell_phone', 'team'];
   const definitionsToSkip = [
-    'finance',
     'internet',
     'location',
     'lorem',
diff --git a/src/definitions/science.ts b/src/definitions/science.ts
index a2fa995b73c..01f791f8a9d 100644
--- a/src/definitions/science.ts
+++ b/src/definitions/science.ts
@@ -13,5 +13,5 @@ export type ScienceDefinition = LocaleEntry<{
   /**
    * Some periodic table element information.
    */
-  chemicalElement: ReadonlyArray<ChemicalElement>;
+  chemical_element: ReadonlyArray<ChemicalElement>;
 }>;
diff --git a/src/definitions/system.ts b/src/definitions/system.ts
index 86868c632ad..72f5c98a7d1 100644
--- a/src/definitions/system.ts
+++ b/src/definitions/system.ts
@@ -7,12 +7,12 @@ export type SystemDefinition = LocaleEntry<{
   /**
    * Returns some common file paths.
    */
-  directoryPaths: string[];
+  directory_paths: string[];
 
   /**
    * The mime type definitions with some additional information.
    */
-  mimeTypes: { [mimeType: string]: SystemMimeTypeEntryDefinition };
+  mime_types: { [mimeType: string]: SystemMimeTypeEntryDefinition };
 }>;
 
 /**
diff --git a/src/locales/base/system/directoryPaths.ts b/src/locales/base/system/directory_paths.ts
similarity index 100%
rename from src/locales/base/system/directoryPaths.ts
rename to src/locales/base/system/directory_paths.ts
diff --git a/src/locales/base/system/index.ts b/src/locales/base/system/index.ts
index 122bee499c7..5d6a50968a2 100644
--- a/src/locales/base/system/index.ts
+++ b/src/locales/base/system/index.ts
@@ -3,12 +3,12 @@
  * Run 'pnpm run generate:locales' to update.
  */
 import type { SystemDefinition } from '../../..';
-import directoryPaths from './directoryPaths';
-import mimeTypes from './mimeTypes';
+import directory_paths from './directory_paths';
+import mime_types from './mime_types';
 
 const system: SystemDefinition = {
-  directoryPaths,
-  mimeTypes,
+  directory_paths,
+  mime_types,
 };
 
 export default system;
diff --git a/src/locales/base/system/mimeTypes.ts b/src/locales/base/system/mime_types.ts
similarity index 100%
rename from src/locales/base/system/mimeTypes.ts
rename to src/locales/base/system/mime_types.ts
diff --git a/src/locales/el/finance/account_type.ts b/src/locales/el/finance/account_type.ts
index 5b84d30c81d..7617d6dfd5c 100644
--- a/src/locales/el/finance/account_type.ts
+++ b/src/locales/el/finance/account_type.ts
@@ -1 +1 @@
-export default ['Καταθετικός', 'Μισθοδοσίας', 'Δανειακός'];
+export default ['Δανειακός', 'Καταθετικός', 'Μισθοδοσίας'];
diff --git a/src/locales/el/finance/credit_card/discover.ts b/src/locales/el/finance/credit_card/discover.ts
index f9a710c8503..7a719ee01df 100644
--- a/src/locales/el/finance/credit_card/discover.ts
+++ b/src/locales/el/finance/credit_card/discover.ts
@@ -1,8 +1,8 @@
 export default [
   '/6011-####-####-###L/',
-  '/65##-####-####-###L/',
-  '/64[4-9]#-####-####-###L/',
   '/6011-62##-####-####-###L/',
-  '/65##-62##-####-####-###L/',
+  '/64[4-9]#-####-####-###L/',
   '/64[4-9]#-62##-####-####-###L/',
+  '/65##-####-####-###L/',
+  '/65##-62##-####-####-###L/',
 ];
diff --git a/src/locales/el/finance/credit_card/mastercard.ts b/src/locales/el/finance/credit_card/mastercard.ts
index 857493ac18c..16770c32aa4 100644
--- a/src/locales/el/finance/credit_card/mastercard.ts
+++ b/src/locales/el/finance/credit_card/mastercard.ts
@@ -1 +1 @@
-export default ['5[1-5]##-####-####-###L', '2[221-720]-####-####-###L'];
+export default ['2[221-720]-####-####-###L', '5[1-5]##-####-####-###L'];
diff --git a/src/locales/el/finance/transaction_type.ts b/src/locales/el/finance/transaction_type.ts
index 51f65625093..ffd333a1e50 100644
--- a/src/locales/el/finance/transaction_type.ts
+++ b/src/locales/el/finance/transaction_type.ts
@@ -1 +1 @@
-export default ['κατάθεση', 'ανάληψη', 'πληρωμή', 'τιμολόγιο'];
+export default ['ανάληψη', 'κατάθεση', 'πληρωμή', 'τιμολόγιο'];
diff --git a/src/locales/en/finance/account_type.ts b/src/locales/en/finance/account_type.ts
index 5e656c2d8ac..625151259ba 100644
--- a/src/locales/en/finance/account_type.ts
+++ b/src/locales/en/finance/account_type.ts
@@ -1,10 +1,10 @@
 export default [
+  'Auto Loan',
   'Checking',
-  'Savings',
-  'Money Market',
-  'Investment',
-  'Home Loan',
   'Credit Card',
-  'Auto Loan',
+  'Home Loan',
+  'Investment',
+  'Money Market',
   'Personal Loan',
+  'Savings',
 ];
diff --git a/src/locales/en/finance/credit_card/discover.ts b/src/locales/en/finance/credit_card/discover.ts
index 23a8f6d5f11..462c3f43bcc 100644
--- a/src/locales/en/finance/credit_card/discover.ts
+++ b/src/locales/en/finance/credit_card/discover.ts
@@ -1,8 +1,8 @@
 export default [
   '6011-####-####-###L',
-  '65##-####-####-###L',
-  '64[4-9]#-####-####-###L',
   '6011-62##-####-####-###L',
-  '65##-62##-####-####-###L',
+  '64[4-9]#-####-####-###L',
   '64[4-9]#-62##-####-####-###L',
+  '65##-####-####-###L',
+  '65##-62##-####-####-###L',
 ];
diff --git a/src/locales/en/finance/credit_card/mastercard.ts b/src/locales/en/finance/credit_card/mastercard.ts
index 857493ac18c..16770c32aa4 100644
--- a/src/locales/en/finance/credit_card/mastercard.ts
+++ b/src/locales/en/finance/credit_card/mastercard.ts
@@ -1 +1 @@
-export default ['5[1-5]##-####-####-###L', '2[221-720]-####-####-###L'];
+export default ['2[221-720]-####-####-###L', '5[1-5]##-####-####-###L'];
diff --git a/src/locales/en/finance/transaction_type.ts b/src/locales/en/finance/transaction_type.ts
index 56de3081036..12d109f54cc 100644
--- a/src/locales/en/finance/transaction_type.ts
+++ b/src/locales/en/finance/transaction_type.ts
@@ -1 +1 @@
-export default ['deposit', 'withdrawal', 'payment', 'invoice'];
+export default ['deposit', 'invoice', 'payment', 'withdrawal'];
diff --git a/src/locales/en/science/chemicalElement.ts b/src/locales/en/science/chemical_element.ts
similarity index 100%
rename from src/locales/en/science/chemicalElement.ts
rename to src/locales/en/science/chemical_element.ts
diff --git a/src/locales/en/science/index.ts b/src/locales/en/science/index.ts
index 86f8dd2f47e..91968423bbf 100644
--- a/src/locales/en/science/index.ts
+++ b/src/locales/en/science/index.ts
@@ -3,11 +3,11 @@
  * Run 'pnpm run generate:locales' to update.
  */
 import type { ScienceDefinition } from '../../..';
-import chemicalElement from './chemicalElement';
+import chemical_element from './chemical_element';
 import unit from './unit';
 
 const science: ScienceDefinition = {
-  chemicalElement,
+  chemical_element,
   unit,
 };
 
diff --git a/src/locales/eo/science/chemicalElement.ts b/src/locales/eo/science/chemical_element.ts
similarity index 100%
rename from src/locales/eo/science/chemicalElement.ts
rename to src/locales/eo/science/chemical_element.ts
diff --git a/src/locales/eo/science/index.ts b/src/locales/eo/science/index.ts
index 86f8dd2f47e..91968423bbf 100644
--- a/src/locales/eo/science/index.ts
+++ b/src/locales/eo/science/index.ts
@@ -3,11 +3,11 @@
  * Run 'pnpm run generate:locales' to update.
  */
 import type { ScienceDefinition } from '../../..';
-import chemicalElement from './chemicalElement';
+import chemical_element from './chemical_element';
 import unit from './unit';
 
 const science: ScienceDefinition = {
-  chemicalElement,
+  chemical_element,
   unit,
 };
 
diff --git a/src/locales/fa/finance/account_type.ts b/src/locales/fa/finance/account_type.ts
index f550ee432f8..fb7728298eb 100644
--- a/src/locales/fa/finance/account_type.ts
+++ b/src/locales/fa/finance/account_type.ts
@@ -1,8 +1,8 @@
 export default [
-  'پس انداز',
   'سرمایه گذاری',
-  'وام مسکن',
-  'کارت اعتباری',
   'وام خودرو',
   'وام شخصی',
+  'وام مسکن',
+  'پس انداز',
+  'کارت اعتباری',
 ];
diff --git a/src/locales/fa/finance/credit_card/mastercard.ts b/src/locales/fa/finance/credit_card/mastercard.ts
index 857493ac18c..16770c32aa4 100644
--- a/src/locales/fa/finance/credit_card/mastercard.ts
+++ b/src/locales/fa/finance/credit_card/mastercard.ts
@@ -1 +1 @@
-export default ['5[1-5]##-####-####-###L', '2[221-720]-####-####-###L'];
+export default ['2[221-720]-####-####-###L', '5[1-5]##-####-####-###L'];
diff --git a/src/locales/fa/finance/transaction_type.ts b/src/locales/fa/finance/transaction_type.ts
index 35dc53d7bb7..2db21fdea47 100644
--- a/src/locales/fa/finance/transaction_type.ts
+++ b/src/locales/fa/finance/transaction_type.ts
@@ -1 +1 @@
-export default ['سپرده', 'برداشت از حساب', 'پرداخت', 'صورتحساب'];
+export default ['برداشت از حساب', 'سپرده', 'صورتحساب', 'پرداخت'];
diff --git a/src/locales/fr/finance/account_type.ts b/src/locales/fr/finance/account_type.ts
index 28b2a89e02c..a9772647059 100644
--- a/src/locales/fr/finance/account_type.ts
+++ b/src/locales/fr/finance/account_type.ts
@@ -1,9 +1,9 @@
 export default [
+  'Carte de crédit',
   'Chèque',
   'Epargne',
-  'Marché monétaire',
   'Investissement',
+  'Marché monétaire',
   'Prêt immobilier',
-  'Carte de crédit',
   'Prêt personnel',
 ];
diff --git a/src/locales/fr/finance/transaction_type.ts b/src/locales/fr/finance/transaction_type.ts
index bdbb578a0da..df088c36887 100644
--- a/src/locales/fr/finance/transaction_type.ts
+++ b/src/locales/fr/finance/transaction_type.ts
@@ -1 +1 @@
-export default ['dépôt', 'retrait', 'paiement', 'facture'];
+export default ['dépôt', 'facture', 'paiement', 'retrait'];
diff --git a/src/locales/hu/finance/account_type.ts b/src/locales/hu/finance/account_type.ts
index 08a69d243b5..ecbc3c52400 100644
--- a/src/locales/hu/finance/account_type.ts
+++ b/src/locales/hu/finance/account_type.ts
@@ -1,10 +1,10 @@
 export default [
+  'Befektetés',
   'Fizetési',
+  'Gépjármű kölcsön',
+  'Hitelkártya',
+  'Lakáshitel',
   'Megtakaritás',
   'Money Market',
-  'Befektetés',
-  'Lakáshitel',
-  'Hitelkártya',
-  'Gépjármű kölcsön',
   'Személyi kölcsön',
 ];
diff --git a/src/locales/hu/finance/transaction_type.ts b/src/locales/hu/finance/transaction_type.ts
index 49d309188b1..95e7e545df7 100644
--- a/src/locales/hu/finance/transaction_type.ts
+++ b/src/locales/hu/finance/transaction_type.ts
@@ -1 +1 @@
-export default ['pénzbefizetés', 'pénzfelvétel', 'fizetés', 'számlázás'];
+export default ['fizetés', 'pénzbefizetés', 'pénzfelvétel', 'számlázás'];
diff --git a/src/locales/nb_NO/science/chemicalElement.ts b/src/locales/nb_NO/science/chemical_element.ts
similarity index 100%
rename from src/locales/nb_NO/science/chemicalElement.ts
rename to src/locales/nb_NO/science/chemical_element.ts
diff --git a/src/locales/nb_NO/science/index.ts b/src/locales/nb_NO/science/index.ts
index 86f8dd2f47e..91968423bbf 100644
--- a/src/locales/nb_NO/science/index.ts
+++ b/src/locales/nb_NO/science/index.ts
@@ -3,11 +3,11 @@
  * Run 'pnpm run generate:locales' to update.
  */
 import type { ScienceDefinition } from '../../..';
-import chemicalElement from './chemicalElement';
+import chemical_element from './chemical_element';
 import unit from './unit';
 
 const science: ScienceDefinition = {
-  chemicalElement,
+  chemical_element,
   unit,
 };
 
diff --git a/src/locales/pl/science/chemicalElement.ts b/src/locales/pl/science/chemical_element.ts
similarity index 100%
rename from src/locales/pl/science/chemicalElement.ts
rename to src/locales/pl/science/chemical_element.ts
diff --git a/src/locales/pl/science/index.ts b/src/locales/pl/science/index.ts
index 86f8dd2f47e..91968423bbf 100644
--- a/src/locales/pl/science/index.ts
+++ b/src/locales/pl/science/index.ts
@@ -3,11 +3,11 @@
  * Run 'pnpm run generate:locales' to update.
  */
 import type { ScienceDefinition } from '../../..';
-import chemicalElement from './chemicalElement';
+import chemical_element from './chemical_element';
 import unit from './unit';
 
 const science: ScienceDefinition = {
-  chemicalElement,
+  chemical_element,
   unit,
 };
 
diff --git a/src/locales/ur/finance/account_type.ts b/src/locales/ur/finance/account_type.ts
index 01cb226c786..02be7f8a89a 100644
--- a/src/locales/ur/finance/account_type.ts
+++ b/src/locales/ur/finance/account_type.ts
@@ -1 +1 @@
-export default ['Savings', 'Current'];
+export default ['Current', 'Savings'];
diff --git a/src/locales/ur/finance/transaction_type.ts b/src/locales/ur/finance/transaction_type.ts
index 56de3081036..12d109f54cc 100644
--- a/src/locales/ur/finance/transaction_type.ts
+++ b/src/locales/ur/finance/transaction_type.ts
@@ -1 +1 @@
-export default ['deposit', 'withdrawal', 'payment', 'invoice'];
+export default ['deposit', 'invoice', 'payment', 'withdrawal'];
diff --git a/src/locales/zh_CN/finance/account_type.ts b/src/locales/zh_CN/finance/account_type.ts
index 57834bea665..5da77a5bfe2 100644
--- a/src/locales/zh_CN/finance/account_type.ts
+++ b/src/locales/zh_CN/finance/account_type.ts
@@ -1,10 +1,10 @@
 export default [
-  '支票',
+  '个人贷款',
+  '信用卡',
   '储蓄',
-  '货币市场',
-  '投资',
   '房屋贷款',
-  '信用卡',
+  '投资',
+  '支票',
   '汽车贷款',
-  '个人贷款',
+  '货币市场',
 ];
diff --git a/src/locales/zh_CN/finance/credit_card/mastercard.ts b/src/locales/zh_CN/finance/credit_card/mastercard.ts
index 857493ac18c..16770c32aa4 100644
--- a/src/locales/zh_CN/finance/credit_card/mastercard.ts
+++ b/src/locales/zh_CN/finance/credit_card/mastercard.ts
@@ -1 +1 @@
-export default ['5[1-5]##-####-####-###L', '2[221-720]-####-####-###L'];
+export default ['2[221-720]-####-####-###L', '5[1-5]##-####-####-###L'];
diff --git a/src/locales/zh_CN/finance/credit_card/unionpay.ts b/src/locales/zh_CN/finance/credit_card/unionpay.ts
index b6bc8e70978..aa66fabf7a6 100644
--- a/src/locales/zh_CN/finance/credit_card/unionpay.ts
+++ b/src/locales/zh_CN/finance/credit_card/unionpay.ts
@@ -1,8 +1,8 @@
 export default [
   '62#############L',
   '67#############L',
-  '81#############L',
-  '81##############L',
-  '81###############L',
   '81################L',
+  '81###############L',
+  '81##############L',
+  '81#############L',
 ];
diff --git a/src/locales/zh_CN/finance/transaction_type.ts b/src/locales/zh_CN/finance/transaction_type.ts
index d6e774430a9..2e0597be1c7 100644
--- a/src/locales/zh_CN/finance/transaction_type.ts
+++ b/src/locales/zh_CN/finance/transaction_type.ts
@@ -1 +1 @@
-export default ['存款', '取款', '支付', '开票'];
+export default ['取款', '存款', '开票', '支付'];
diff --git a/src/locales/zh_CN/science/chemicalElement.ts b/src/locales/zh_CN/science/chemical_element.ts
similarity index 100%
rename from src/locales/zh_CN/science/chemicalElement.ts
rename to src/locales/zh_CN/science/chemical_element.ts
diff --git a/src/locales/zh_CN/science/index.ts b/src/locales/zh_CN/science/index.ts
index 86f8dd2f47e..91968423bbf 100644
--- a/src/locales/zh_CN/science/index.ts
+++ b/src/locales/zh_CN/science/index.ts
@@ -3,11 +3,11 @@
  * Run 'pnpm run generate:locales' to update.
  */
 import type { ScienceDefinition } from '../../..';
-import chemicalElement from './chemicalElement';
+import chemical_element from './chemical_element';
 import unit from './unit';
 
 const science: ScienceDefinition = {
-  chemicalElement,
+  chemical_element,
   unit,
 };
 
diff --git a/src/modules/science/index.ts b/src/modules/science/index.ts
index 26c78014786..525ff8bf0cc 100644
--- a/src/modules/science/index.ts
+++ b/src/modules/science/index.ts
@@ -49,7 +49,7 @@ export class ScienceModule extends ModuleBase {
    */
   chemicalElement(): ChemicalElement {
     return this.faker.helpers.arrayElement(
-      this.faker.definitions.science.chemicalElement
+      this.faker.definitions.science.chemical_element
     );
   }
 
diff --git a/src/modules/system/index.ts b/src/modules/system/index.ts
index 3468bbb0a79..1fcc9be3271 100644
--- a/src/modules/system/index.ts
+++ b/src/modules/system/index.ts
@@ -114,7 +114,7 @@ export class SystemModule extends ModuleBase {
    * @since 3.1.0
    */
   mimeType(): string {
-    const mimeTypeKeys = Object.keys(this.faker.definitions.system.mimeTypes);
+    const mimeTypeKeys = Object.keys(this.faker.definitions.system.mime_types);
 
     return this.faker.helpers.arrayElement(mimeTypeKeys);
   }
@@ -152,7 +152,7 @@ export class SystemModule extends ModuleBase {
    * @since 3.1.0
    */
   fileType(): string {
-    const mimeTypes = this.faker.definitions.system.mimeTypes;
+    const mimeTypes = this.faker.definitions.system.mime_types;
 
     const typeSet = new Set(
       Object.keys(mimeTypes).map((key) => key.split('/')[0])
@@ -172,7 +172,7 @@ export class SystemModule extends ModuleBase {
    * @since 3.1.0
    */
   fileExt(mimeType?: string): string {
-    const mimeTypes = this.faker.definitions.system.mimeTypes;
+    const mimeTypes = this.faker.definitions.system.mime_types;
 
     if (typeof mimeType === 'string') {
       return this.faker.helpers.arrayElement(mimeTypes[mimeType].extensions);
@@ -193,7 +193,7 @@ export class SystemModule extends ModuleBase {
    * @since 3.1.0
    */
   directoryPath(): string {
-    const paths = this.faker.definitions.system.directoryPaths;
+    const paths = this.faker.definitions.system.directory_paths;
     return this.faker.helpers.arrayElement(paths);
   }
 
diff --git a/test/modules/__snapshots__/finance.spec.ts.snap b/test/modules/__snapshots__/finance.spec.ts.snap
index bf62bcd747e..2f394c08bab 100644
--- a/test/modules/__snapshots__/finance.spec.ts.snap
+++ b/test/modules/__snapshots__/finance.spec.ts.snap
@@ -1,6 +1,6 @@
 // Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
 
-exports[`finance > 42 > accountName 1`] = `"Money Market Account"`;
+exports[`finance > 42 > accountName 1`] = `"Credit Card Account"`;
 
 exports[`finance > 42 > accountNumber > noArgs 1`] = `"39751108"`;
 
@@ -30,11 +30,11 @@ exports[`finance > 42 > creditCardCVV 1`] = `"397"`;
 
 exports[`finance > 42 > creditCardIssuer 1`] = `"discover"`;
 
-exports[`finance > 42 > creditCardNumber > noArgs 1`] = `"6485-6211-0867-0982-1138"`;
+exports[`finance > 42 > creditCardNumber > noArgs 1`] = `"6575-6211-0867-0982-1139"`;
 
 exports[`finance > 42 > creditCardNumber > with issuer 1`] = `"4975110867099"`;
 
-exports[`finance > 42 > creditCardNumber > with issuer option mastercard 1`] = `"5575-1108-6709-8213"`;
+exports[`finance > 42 > creditCardNumber > with issuer option mastercard 1`] = `"2696-7511-0867-0988"`;
 
 exports[`finance > 42 > creditCardNumber > with issuer option visa 1`] = `"4975110867099"`;
 
@@ -82,9 +82,9 @@ exports[`finance > 42 > routingNumber 1`] = `"397511082"`;
 
 exports[`finance > 42 > transactionDescription 1`] = `"deposit transaction at Reynolds, Miller and Crist using card ending with ***(...1135) for KES 374.54 in account ***08670982"`;
 
-exports[`finance > 42 > transactionType 1`] = `"withdrawal"`;
+exports[`finance > 42 > transactionType 1`] = `"invoice"`;
 
-exports[`finance > 1211 > accountName 1`] = `"Personal Loan Account"`;
+exports[`finance > 1211 > accountName 1`] = `"Savings Account"`;
 
 exports[`finance > 1211 > accountNumber > noArgs 1`] = `"98296673"`;
 
@@ -118,7 +118,7 @@ exports[`finance > 1211 > creditCardNumber > noArgs 1`] = `"4296-6736-8768-4885"
 
 exports[`finance > 1211 > creditCardNumber > with issuer 1`] = `"4829-6673-6876-8484"`;
 
-exports[`finance > 1211 > creditCardNumber > with issuer option mastercard 1`] = `"2667-2966-7368-7681"`;
+exports[`finance > 1211 > creditCardNumber > with issuer option mastercard 1`] = `"5529-6673-6876-8484"`;
 
 exports[`finance > 1211 > creditCardNumber > with issuer option visa 1`] = `"4829-6673-6876-8484"`;
 
@@ -166,9 +166,9 @@ exports[`finance > 1211 > routingNumber 1`] = `"982966738"`;
 
 exports[`finance > 1211 > transactionDescription 1`] = `"payment transaction at Fahey, Zieme and Osinski using card ending with ***(...8825) for CRC 928.52 in account ***73687684"`;
 
-exports[`finance > 1211 > transactionType 1`] = `"invoice"`;
+exports[`finance > 1211 > transactionType 1`] = `"withdrawal"`;
 
-exports[`finance > 1337 > accountName 1`] = `"Money Market Account"`;
+exports[`finance > 1337 > accountName 1`] = `"Credit Card Account"`;
 
 exports[`finance > 1337 > accountNumber > noArgs 1`] = `"21243529"`;
 
@@ -202,7 +202,7 @@ exports[`finance > 1337 > creditCardNumber > noArgs 1`] = `"3014-352971-3614"`;
 
 exports[`finance > 1337 > creditCardNumber > with issuer 1`] = `"4124352971364"`;
 
-exports[`finance > 1337 > creditCardNumber > with issuer option mastercard 1`] = `"5124-3529-7136-1949"`;
+exports[`finance > 1337 > creditCardNumber > with issuer option mastercard 1`] = `"2300-2435-2971-3611"`;
 
 exports[`finance > 1337 > creditCardNumber > with issuer option visa 1`] = `"4124352971364"`;
 
@@ -248,6 +248,6 @@ exports[`finance > 1337 > pin > with length option 1`] = `"2124352971"`;
 
 exports[`finance > 1337 > routingNumber 1`] = `"212435298"`;
 
-exports[`finance > 1337 > transactionDescription 1`] = `"withdrawal transaction at Gottlieb - Koelpin using card ending with ***(...9477) for HUF 262.02 in account ***52971361"`;
+exports[`finance > 1337 > transactionDescription 1`] = `"invoice transaction at Gottlieb - Koelpin using card ending with ***(...9477) for HUF 262.02 in account ***52971361"`;
 
-exports[`finance > 1337 > transactionType 1`] = `"withdrawal"`;
+exports[`finance > 1337 > transactionType 1`] = `"invoice"`;
diff --git a/test/modules/helpers.spec.ts b/test/modules/helpers.spec.ts
index b9b59f22b95..09f264679d3 100644
--- a/test/modules/helpers.spec.ts
+++ b/test/modules/helpers.spec.ts
@@ -799,7 +799,8 @@ describe('helpers', () => {
         });
 
         it('should never return the callback result when probability is 0', () => {
-          const actual = faker.helpers.maybe(() => expect.fail(), {
+          const method: () => unknown = expect.fail;
+          const actual = faker.helpers.maybe(method, {
             probability: 0,
           });
 
diff --git a/test/modules/science.spec.ts b/test/modules/science.spec.ts
index 80002c1968f..051fecbb3cf 100644
--- a/test/modules/science.spec.ts
+++ b/test/modules/science.spec.ts
@@ -28,7 +28,7 @@ describe('science', () => {
 
           expect(name).toBeTypeOf('string');
           expect(() => {
-            faker.definitions.science.chemicalElement.find(
+            faker.definitions.science.chemical_element.find(
               (element) => element.name === name
             );
           }).toBeTruthy();
@@ -39,7 +39,7 @@ describe('science', () => {
 
           expect(symbol).toBeTypeOf('string');
           expect(() => {
-            faker.definitions.science.chemicalElement.find(
+            faker.definitions.science.chemical_element.find(
               (element) => element.symbol === symbol
             );
           }).toBeTruthy();
@@ -50,7 +50,7 @@ describe('science', () => {
 
           expect(atomicNumber).toBeTypeOf('number');
           expect(() => {
-            faker.definitions.science.chemicalElement.find(
+            faker.definitions.science.chemical_element.find(
               (element) => element.atomicNumber === atomicNumber
             );
           }).toBeTruthy();