feat(locale): add additional metadata properties (#2025)

65 files changed, 526 insertions, 134 deletions

diff --git a/src/definitions/definitions.ts b/src/definitions/definitions.ts
index 112c2c1a..dd477beb 100644
--- a/src/definitions/definitions.ts
+++ b/src/definitions/definitions.ts
@@ -32,7 +32,7 @@ export type LocaleEntry<T extends Record<string, unknown>> = Partial<T> &
  * that most properties are optional and extra properties are allowed.
  */
 export type LocaleDefinition = {
-  metadata: MetadataDefinitions;
+  metadata?: MetadataDefinitions;
   airline?: AirlineDefinitions;
   animal?: AnimalDefinitions;
   color?: ColorDefinitions;
diff --git a/src/definitions/metadata.ts b/src/definitions/metadata.ts
index 398c2c2a..c5ee074b 100644
--- a/src/definitions/metadata.ts
+++ b/src/definitions/metadata.ts
@@ -1,6 +1,60 @@
-export type MetadataDefinitions = {
+import type { LocaleEntry } from './definitions';
+
+/**
+ * Metadata for pre-built locales.
+ */
+export type PreBuiltMetadataDefinitions = {
   /**
    * The English name of the language (and the specific country, if defined).
    */
   title: string;
-} & Record<string, unknown>;
+  /**
+   * The full code of the locale, including the country code if applicable.
+   */
+  code: string;
+  /**
+   * The endonym (native name) of the language (and the specific country, if defined).
+   *
+   * @see https://en.wikipedia.org/wiki/List_of_countries_and_dependencies_and_their_capitals_in_native_languages
+   */
+  endonym: string;
+  /**
+   * The ISO 639-1 code of the language.
+   *
+   * @see https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes
+   */
+  language: string;
+  /**
+   * The specific variant of the language. This usually refers to a dialect or slang.
+   */
+  variant?: string;
+  /**
+   * The direction of the language, either 'ltr' (left to right) or 'rtl' (right to left).
+   */
+  dir: 'ltr' | 'rtl';
+  /**
+   * The ISO 15924 code of the script.
+   *
+   * @see https://en.wikipedia.org/wiki/ISO_15924
+   */
+  script: string;
+};
+
+/**
+ * Metadata for pre-built locales for a specific country.
+ */
+export type PreBuiltMetadataDefinitionsForCountry =
+  PreBuiltMetadataDefinitions & {
+    /**
+     * The ISO 3166-1 alpha-2 code of the country.
+     *
+     * @see https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2
+     */
+    country: string;
+  };
+
+/**
+ * Metadata for the current locale.
+ */
+export type MetadataDefinitions =
+  LocaleEntry<PreBuiltMetadataDefinitionsForCountry>;
diff --git a/src/locales/af_ZA/metadata.ts b/src/locales/af_ZA/metadata.ts
index 32120b00..f4787014 100644
--- a/src/locales/af_ZA/metadata.ts
+++ b/src/locales/af_ZA/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
-  title: 'Afrikaans',
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
+  title: 'Afrikaans (South Africa)',
+  code: 'af_ZA',
+  country: 'ZA',
+  language: 'af',
+  endonym: 'Afrikaans (Suid-Afrika)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/ar/metadata.ts b/src/locales/ar/metadata.ts
index f94ccd80..8199b51a 100644
--- a/src/locales/ar/metadata.ts
+++ b/src/locales/ar/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Arabic',
+  code: 'ar',
+  language: 'ar',
+  endonym: 'اَلْعَرَبِيَّةُ',
+  dir: 'rtl',
+  script: 'Arab',
 };
 
 export default metadata;
diff --git a/src/locales/az/metadata.ts b/src/locales/az/metadata.ts
index c1360366..1ca74673 100644
--- a/src/locales/az/metadata.ts
+++ b/src/locales/az/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Azerbaijani',
+  code: 'az',
+  language: 'az',
+  endonym: 'azərbaycan dili',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/base/metadata.ts b/src/locales/base/metadata.ts
index 888b4d88..11369341 100644
--- a/src/locales/base/metadata.ts
+++ b/src/locales/base/metadata.ts
@@ -2,6 +2,7 @@ import type { MetadataDefinitions } from '../..';
 
 const metadata: MetadataDefinitions = {
   title: 'Base',
+  code: 'base',
 };
 
 export default metadata;
diff --git a/src/locales/cs_CZ/metadata.ts b/src/locales/cs_CZ/metadata.ts
index 98ab47df..2ccd3520 100644
--- a/src/locales/cs_CZ/metadata.ts
+++ b/src/locales/cs_CZ/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'Czech (Czechia)',
+  code: 'cs_CZ',
+  country: 'CZ',
+  language: 'cs',
+  endonym: 'čeština (Česká republika)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/de/metadata.ts b/src/locales/de/metadata.ts
index d66b6de1..f38350f9 100644
--- a/src/locales/de/metadata.ts
+++ b/src/locales/de/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'German',
+  code: 'de',
+  language: 'de',
+  endonym: 'Deutsch',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/de_AT/metadata.ts b/src/locales/de_AT/metadata.ts
index db773f77..2604409b 100644
--- a/src/locales/de_AT/metadata.ts
+++ b/src/locales/de_AT/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'German (Austria)',
+  code: 'de_AT',
+  country: 'AT',
+  language: 'de',
+  endonym: 'Deutsch (Österreich)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/de_CH/metadata.ts b/src/locales/de_CH/metadata.ts
index 4e462b89..75bbb76b 100644
--- a/src/locales/de_CH/metadata.ts
+++ b/src/locales/de_CH/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'German (Switzerland)',
+  code: 'de_CH',
+  country: 'CH',
+  language: 'de',
+  endonym: 'Deutsch (Schweiz)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/dv/metadata.ts b/src/locales/dv/metadata.ts
index d30d10a2..5329afce 100644
--- a/src/locales/dv/metadata.ts
+++ b/src/locales/dv/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Maldivian',
+  code: 'dv',
+  language: 'dv',
+  endonym: 'ދިވެހި',
+  dir: 'rtl',
+  script: 'Thaa',
 };
 
 export default metadata;
diff --git a/src/locales/el/metadata.ts b/src/locales/el/metadata.ts
index 17dd91dc..76197ab3 100644
--- a/src/locales/el/metadata.ts
+++ b/src/locales/el/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Greek',
+  code: 'el',
+  language: 'el',
+  endonym: 'Ελληνικά',
+  dir: 'ltr',
+  script: 'Grek',
 };
 
 export default metadata;
diff --git a/src/locales/en/metadata.ts b/src/locales/en/metadata.ts
index 30a93637..f31fcffc 100644
--- a/src/locales/en/metadata.ts
+++ b/src/locales/en/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'English',
+  code: 'en',
+  language: 'en',
+  endonym: 'English',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/en_AU/metadata.ts b/src/locales/en_AU/metadata.ts
index be925f15..b50713a9 100644
--- a/src/locales/en_AU/metadata.ts
+++ b/src/locales/en_AU/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'English (Australia)',
+  code: 'en_AU',
+  country: 'AU',
+  language: 'en',
+  endonym: 'English (Australia)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/en_AU_ocker/metadata.ts b/src/locales/en_AU_ocker/metadata.ts
index b877b114..3159e688 100644
--- a/src/locales/en_AU_ocker/metadata.ts
+++ b/src/locales/en_AU_ocker/metadata.ts
@@ -1,7 +1,14 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'English (Australia Ocker)',
+  code: 'en_AU_ocker',
+  country: 'AU',
+  language: 'en',
+  variant: 'ocker',
+  endonym: 'English (Australia)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/en_BORK/metadata.ts b/src/locales/en_BORK/metadata.ts
index 7349bdca..d250e9ce 100644
--- a/src/locales/en_BORK/metadata.ts
+++ b/src/locales/en_BORK/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'English (Bork)',
+  code: 'en_BORK',
+  variant: 'BORK',
+  language: 'en',
+  endonym: 'English (Bork)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/en_CA/metadata.ts b/src/locales/en_CA/metadata.ts
index 40ea4ad0..31777930 100644
--- a/src/locales/en_CA/metadata.ts
+++ b/src/locales/en_CA/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'English (Canada)',
+  code: 'en_CA',
+  country: 'CA',
+  language: 'en',
+  endonym: 'English (Canada)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/en_GB/metadata.ts b/src/locales/en_GB/metadata.ts
index 4007132e..bd33818d 100644
--- a/src/locales/en_GB/metadata.ts
+++ b/src/locales/en_GB/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'English (Great Britain)',
+  code: 'en_GB',
+  country: 'GB',
+  language: 'en',
+  endonym: 'English (Great Britain)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/en_GH/metadata.ts b/src/locales/en_GH/metadata.ts
index 9bd30240..46171582 100644
--- a/src/locales/en_GH/metadata.ts
+++ b/src/locales/en_GH/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'English (Ghana)',
+  code: 'en_GH',
+  country: 'GH',
+  language: 'en',
+  endonym: 'English (Ghana)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/en_IE/metadata.ts b/src/locales/en_IE/metadata.ts
index 765b371c..a853c874 100644
--- a/src/locales/en_IE/metadata.ts
+++ b/src/locales/en_IE/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'English (Ireland)',
+  code: 'en_IE',
+  country: 'IE',
+  language: 'en',
+  endonym: 'English (Ireland)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/en_IN/metadata.ts b/src/locales/en_IN/metadata.ts
index dd7ce2ca..9eafd9f5 100644
--- a/src/locales/en_IN/metadata.ts
+++ b/src/locales/en_IN/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'English (India)',
+  code: 'en_IN',
+  country: 'IN',
+  language: 'en',
+  endonym: 'English (India)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/en_NG/metadata.ts b/src/locales/en_NG/metadata.ts
index fed81e3f..98833de3 100644
--- a/src/locales/en_NG/metadata.ts
+++ b/src/locales/en_NG/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'English (Nigeria)',
+  code: 'en_NG',
+  country: 'NG',
+  language: 'en',
+  endonym: 'English (Nigeria)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/en_US/metadata.ts b/src/locales/en_US/metadata.ts
index c08c0170..a0bbdd39 100644
--- a/src/locales/en_US/metadata.ts
+++ b/src/locales/en_US/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'English (United States)',
+  code: 'en_US',
+  country: 'US',
+  language: 'en',
+  endonym: 'English (United States)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/en_ZA/metadata.ts b/src/locales/en_ZA/metadata.ts
index dbca3b10..6047da0a 100644
--- a/src/locales/en_ZA/metadata.ts
+++ b/src/locales/en_ZA/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'English (South Africa)',
+  code: 'en_ZA',
+  country: 'ZA',
+  language: 'en',
+  endonym: 'English (South Africa)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/es/metadata.ts b/src/locales/es/metadata.ts
index b6c6cf19..c1cc17a5 100644
--- a/src/locales/es/metadata.ts
+++ b/src/locales/es/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Spanish',
+  code: 'es',
+  language: 'es',
+  endonym: 'Español',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/es_MX/metadata.ts b/src/locales/es_MX/metadata.ts
index 540895d6..a9cacd66 100644
--- a/src/locales/es_MX/metadata.ts
+++ b/src/locales/es_MX/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'Spanish (Mexico)',
+  code: 'es_MX',
+  country: 'MX',
+  language: 'es',
+  endonym: 'Español (México)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/fa/metadata.ts b/src/locales/fa/metadata.ts
index 0fc4f55c..88503c54 100644
--- a/src/locales/fa/metadata.ts
+++ b/src/locales/fa/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
-  title: 'Farsi',
+const metadata: PreBuiltMetadataDefinitions = {
+  title: 'Farsi/Persian',
+  code: 'fa',
+  language: 'fa',
+  endonym: 'فارسی',
+  dir: 'rtl',
+  script: 'Arab',
 };
 
 export default metadata;
diff --git a/src/locales/fi/metadata.ts b/src/locales/fi/metadata.ts
index 08115a1a..43d45fcb 100644
--- a/src/locales/fi/metadata.ts
+++ b/src/locales/fi/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Finnish',
+  code: 'fi',
+  language: 'fi',
+  endonym: 'suomi',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/fr/metadata.ts b/src/locales/fr/metadata.ts
index 45f83699..eb49f56f 100644
--- a/src/locales/fr/metadata.ts
+++ b/src/locales/fr/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'French',
+  code: 'fr',
+  language: 'fr',
+  endonym: 'Français',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/fr_BE/metadata.ts b/src/locales/fr_BE/metadata.ts
index 87a70b27..d98eb72b 100644
--- a/src/locales/fr_BE/metadata.ts
+++ b/src/locales/fr_BE/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'French (Belgium)',
+  code: 'fr_BE',
+  country: 'BE',
+  language: 'fr',
+  endonym: 'Français (Belgique)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/fr_CA/metadata.ts b/src/locales/fr_CA/metadata.ts
index 306b3296..62e54062 100644
--- a/src/locales/fr_CA/metadata.ts
+++ b/src/locales/fr_CA/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'French (Canada)',
+  code: 'fr_CA',
+  country: 'CA',
+  language: 'fr',
+  endonym: 'Français (Canada)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/fr_CH/metadata.ts b/src/locales/fr_CH/metadata.ts
index 5b191b81..86b69f34 100644
--- a/src/locales/fr_CH/metadata.ts
+++ b/src/locales/fr_CH/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'French (Switzerland)',
+  code: 'fr_CH',
+  country: 'CH',
+  language: 'fr',
+  endonym: 'Français (Suisse)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/fr_LU/metadata.ts b/src/locales/fr_LU/metadata.ts
index 79da9cef..b8656a67 100644
--- a/src/locales/fr_LU/metadata.ts
+++ b/src/locales/fr_LU/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'French (Luxembourg)',
+  code: 'fr_LU',
+  country: 'LU',
+  language: 'fr',
+  endonym: 'Français (Luxembourg)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/he/metadata.ts b/src/locales/he/metadata.ts
index e816e529..a3c41bac 100644
--- a/src/locales/he/metadata.ts
+++ b/src/locales/he/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Hebrew',
+  code: 'he',
+  language: 'he',
+  endonym: 'עברית',
+  dir: 'rtl',
+  script: 'Hebr',
 };
 
 export default metadata;
diff --git a/src/locales/hr/metadata.ts b/src/locales/hr/metadata.ts
index bc95cdaa..e4014aaf 100644
--- a/src/locales/hr/metadata.ts
+++ b/src/locales/hr/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Croatian',
+  code: 'hr',
+  language: 'hr',
+  endonym: 'Hrvatski',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/hu/metadata.ts b/src/locales/hu/metadata.ts
index 8602d9a0..48da69ad 100644
--- a/src/locales/hu/metadata.ts
+++ b/src/locales/hu/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Hungarian',
+  code: 'hu',
+  language: 'hu',
+  endonym: 'magyar',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/hy/metadata.ts b/src/locales/hy/metadata.ts
index c20110c1..835636e1 100644
--- a/src/locales/hy/metadata.ts
+++ b/src/locales/hy/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Armenian',
+  code: 'hy',
+  language: 'hy',
+  endonym: 'Հայերեն',
+  dir: 'ltr',
+  script: 'Armn',
 };
 
 export default metadata;
diff --git a/src/locales/id_ID/metadata.ts b/src/locales/id_ID/metadata.ts
index 73df9ea4..795e1585 100644
--- a/src/locales/id_ID/metadata.ts
+++ b/src/locales/id_ID/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
-  title: 'Indonesian',
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
+  title: 'Indonesian (Indonesia)',
+  code: 'id_ID',
+  country: 'ID',
+  language: 'id',
+  endonym: 'Bahasa Indonesia (Indonesia)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/it/metadata.ts b/src/locales/it/metadata.ts
index 78e7e2ee..b53e4057 100644
--- a/src/locales/it/metadata.ts
+++ b/src/locales/it/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Italian',
+  code: 'it',
+  language: 'it',
+  endonym: 'Italiano',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/ja/metadata.ts b/src/locales/ja/metadata.ts
index e1f2e3a2..3e61ca96 100644
--- a/src/locales/ja/metadata.ts
+++ b/src/locales/ja/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Japanese',
+  code: 'ja',
+  language: 'ja',
+  endonym: '日本語',
+  dir: 'ltr',
+  script: 'Jpan',
 };
 
 export default metadata;
diff --git a/src/locales/ka_GE/metadata.ts b/src/locales/ka_GE/metadata.ts
index 5a049913..bef4d2b1 100644
--- a/src/locales/ka_GE/metadata.ts
+++ b/src/locales/ka_GE/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'Georgian (Georgia)',
+  code: 'ka_GE',
+  country: 'GE',
+  language: 'ka',
+  endonym: 'ქართული (საქართველო)',
+  dir: 'ltr',
+  script: 'Geor',
 };
 
 export default metadata;
diff --git a/src/locales/ko/metadata.ts b/src/locales/ko/metadata.ts
index f5343b2f..4fa91e58 100644
--- a/src/locales/ko/metadata.ts
+++ b/src/locales/ko/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Korean',
+  code: 'ko',
+  language: 'ko',
+  endonym: '한국어',
+  dir: 'ltr',
+  script: 'Kore',
 };
 
 export default metadata;
diff --git a/src/locales/lv/metadata.ts b/src/locales/lv/metadata.ts
index 60b0cf2f..6685a322 100644
--- a/src/locales/lv/metadata.ts
+++ b/src/locales/lv/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Latvian',
+  code: 'lv',
+  language: 'lv',
+  endonym: 'latviešu valoda',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/mk/metadata.ts b/src/locales/mk/metadata.ts
index 6c564a10..1ce27a68 100644
--- a/src/locales/mk/metadata.ts
+++ b/src/locales/mk/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Macedonian',
+  code: 'mk',
+  language: 'mk',
+  endonym: 'македонски јазик',
+  dir: 'ltr',
+  script: 'Cyrl',
 };
 
 export default metadata;
diff --git a/src/locales/nb_NO/metadata.ts b/src/locales/nb_NO/metadata.ts
index 5037872f..5eb03faf 100644
--- a/src/locales/nb_NO/metadata.ts
+++ b/src/locales/nb_NO/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
-  title: 'Norwegian',
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
+  title: 'Norwegian (Norway)',
+  code: 'nb_NO',
+  country: 'NO',
+  language: 'nb',
+  endonym: 'Norsk bokmål (Norge)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/ne/metadata.ts b/src/locales/ne/metadata.ts
index 8b3043c6..c8429288 100644
--- a/src/locales/ne/metadata.ts
+++ b/src/locales/ne/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
-  title: 'Nepalese',
+const metadata: PreBuiltMetadataDefinitions = {
+  title: 'Nepali',
+  code: 'ne',
+  language: 'ne',
+  endonym: 'नेपाली',
+  dir: 'ltr',
+  script: 'Deva',
 };
 
 export default metadata;
diff --git a/src/locales/nl/metadata.ts b/src/locales/nl/metadata.ts
index d69a9a2f..a72d9790 100644
--- a/src/locales/nl/metadata.ts
+++ b/src/locales/nl/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Dutch',
+  code: 'nl',
+  language: 'nl',
+  endonym: 'Nederlands',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/nl_BE/metadata.ts b/src/locales/nl_BE/metadata.ts
index 6da791a1..73b0f1dc 100644
--- a/src/locales/nl_BE/metadata.ts
+++ b/src/locales/nl_BE/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'Dutch (Belgium)',
+  code: 'nl_BE',
+  country: 'BE',
+  language: 'nl',
+  endonym: 'Nederlands (België)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/pl/metadata.ts b/src/locales/pl/metadata.ts
index fb70cd86..c9e95c34 100644
--- a/src/locales/pl/metadata.ts
+++ b/src/locales/pl/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Polish',
+  code: 'pl',
+  language: 'pl',
+  endonym: 'Polski',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/pt_BR/metadata.ts b/src/locales/pt_BR/metadata.ts
index 0ef5efd8..7feb002f 100644
--- a/src/locales/pt_BR/metadata.ts
+++ b/src/locales/pt_BR/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'Portuguese (Brazil)',
+  code: 'pt_BR',
+  country: 'BR',
+  language: 'pt',
+  endonym: 'Português (Brasil)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/pt_PT/metadata.ts b/src/locales/pt_PT/metadata.ts
index 020f3bbd..65078207 100644
--- a/src/locales/pt_PT/metadata.ts
+++ b/src/locales/pt_PT/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'Portuguese (Portugal)',
+  code: 'pt_PT',
+  country: 'PT',
+  language: 'pt',
+  endonym: 'Português (Portugal)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/ro/metadata.ts b/src/locales/ro/metadata.ts
index 711017cf..e10c0d35 100644
--- a/src/locales/ro/metadata.ts
+++ b/src/locales/ro/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Romanian',
+  code: 'ro',
+  language: 'ro',
+  endonym: 'Română',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/ru/metadata.ts b/src/locales/ru/metadata.ts
index de20840d..8e6db955 100644
--- a/src/locales/ru/metadata.ts
+++ b/src/locales/ru/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Russian',
+  code: 'ru',
+  language: 'ru',
+  endonym: 'Русский',
+  dir: 'ltr',
+  script: 'Cyrl',
 };
 
 export default metadata;
diff --git a/src/locales/sk/metadata.ts b/src/locales/sk/metadata.ts
index 88e8fee4..0bc938d1 100644
--- a/src/locales/sk/metadata.ts
+++ b/src/locales/sk/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
-  title: 'Slovakian',
+const metadata: PreBuiltMetadataDefinitions = {
+  title: 'Slovak',
+  code: 'sk',
+  language: 'sk',
+  endonym: 'slovenčina',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/sr_RS_latin/metadata.ts b/src/locales/sr_RS_latin/metadata.ts
index 1491476c..b94b3410 100644
--- a/src/locales/sr_RS_latin/metadata.ts
+++ b/src/locales/sr_RS_latin/metadata.ts
@@ -1,7 +1,14 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
-  title: 'Serbian (Latin)',
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
+  title: 'Serbian (Serbia, Latin)',
+  code: 'sr_RS_latin',
+  country: 'RS',
+  language: 'sr',
+  variant: 'latin',
+  endonym: 'srpski (Srbija, latinica)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/sv/metadata.ts b/src/locales/sv/metadata.ts
index 42fe6a4a..e206b2d6 100644
--- a/src/locales/sv/metadata.ts
+++ b/src/locales/sv/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Swedish',
+  code: 'sv',
+  language: 'sv',
+  endonym: 'Svenska',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/th/metadata.ts b/src/locales/th/metadata.ts
index 373affbd..ae53d4ac 100644
--- a/src/locales/th/metadata.ts
+++ b/src/locales/th/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Thai',
+  code: 'th',
+  language: 'th',
+  endonym: 'ไทย',
+  dir: 'ltr',
+  script: 'Thai',
 };
 
 export default metadata;
diff --git a/src/locales/tr/metadata.ts b/src/locales/tr/metadata.ts
index 8d914062..9315cae1 100644
--- a/src/locales/tr/metadata.ts
+++ b/src/locales/tr/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Turkish',
+  code: 'tr',
+  language: 'tr',
+  endonym: 'Türkçe',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/uk/metadata.ts b/src/locales/uk/metadata.ts
index e2d58ed3..6f305d89 100644
--- a/src/locales/uk/metadata.ts
+++ b/src/locales/uk/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Ukrainian',
+  code: 'uk',
+  language: 'uk',
+  endonym: 'Українська',
+  dir: 'ltr',
+  script: 'Cyrl',
 };
 
 export default metadata;
diff --git a/src/locales/ur/metadata.ts b/src/locales/ur/metadata.ts
index b0610ece..6977c4ae 100644
--- a/src/locales/ur/metadata.ts
+++ b/src/locales/ur/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Urdu',
+  code: 'ur',
+  language: 'ur',
+  endonym: 'اردو',
+  dir: 'rtl',
+  script: 'Arab',
 };
 
 export default metadata;
diff --git a/src/locales/vi/metadata.ts b/src/locales/vi/metadata.ts
index 4d8e01f0..abf574f3 100644
--- a/src/locales/vi/metadata.ts
+++ b/src/locales/vi/metadata.ts
@@ -1,7 +1,12 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitions } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitions = {
   title: 'Vietnamese',
+  code: 'vi',
+  language: 'vi',
+  endonym: 'Tiếng Việt',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/locales/zh_CN/metadata.ts b/src/locales/zh_CN/metadata.ts
index ad2dc1a3..44f79bbe 100644
--- a/src/locales/zh_CN/metadata.ts
+++ b/src/locales/zh_CN/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
-  title: 'Chinese',
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
+  title: 'Chinese (China)',
+  code: 'zh_CN',
+  country: 'CN',
+  language: 'zh',
+  endonym: '中文 (中国)',
+  dir: 'ltr',
+  script: 'Hans',
 };
 
 export default metadata;
diff --git a/src/locales/zh_TW/metadata.ts b/src/locales/zh_TW/metadata.ts
index 54e15cac..269c4e0c 100644
--- a/src/locales/zh_TW/metadata.ts
+++ b/src/locales/zh_TW/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'Chinese (Taiwan)',
+  code: 'zh_TW',
+  country: 'TW',
+  language: 'zh',
+  endonym: '中文 (臺灣)',
+  dir: 'ltr',
+  script: 'Hant',
 };
 
 export default metadata;
diff --git a/src/locales/zu_ZA/metadata.ts b/src/locales/zu_ZA/metadata.ts
index 3e30c09d..c6553acd 100644
--- a/src/locales/zu_ZA/metadata.ts
+++ b/src/locales/zu_ZA/metadata.ts
@@ -1,7 +1,13 @@
-import type { MetadataDefinitions } from '../..';
+import type { PreBuiltMetadataDefinitionsForCountry } from '../../definitions/metadata';
 
-const metadata: MetadataDefinitions = {
+const metadata: PreBuiltMetadataDefinitionsForCountry = {
   title: 'Zulu (South Africa)',
+  code: 'zu_ZA',
+  country: 'ZA',
+  language: 'zu',
+  endonym: 'isiZulu (Iningizimu Afrika)',
+  dir: 'ltr',
+  script: 'Latn',
 };
 
 export default metadata;
diff --git a/src/utils/merge-locales.ts b/src/utils/merge-locales.ts
index e8bdef33..8fb531dd 100644
--- a/src/utils/merge-locales.ts
+++ b/src/utils/merge-locales.ts
@@ -14,7 +14,7 @@ import type { LocaleDefinition } from '..';
  * const de_CH_with_fallbacks = mergeLocales([ de_CH, de, en ]);
  */
 export function mergeLocales(locales: LocaleDefinition[]): LocaleDefinition {
-  const merged: LocaleDefinition = {} as LocaleDefinition;
+  const merged: LocaleDefinition = {};
 
   for (const locale of locales) {
     for (const key in locale) {