feat: Add language option to cspell eslint plugin

packages/cspell-eslint-plugin/assets/options.schema.json

@@ -158,6 +158,11 @@
           },
           "type": "array"
         },
+        "language": {
+          "default": "en",
+          "description": "Current active spelling language. This specifies the language locale to use in choosing the general dictionary.\n\nFor example:\n\n- \"en-GB\" for British English.\n- \"en,nl\" to enable both English and Dutch.",
+          "type": "string"
+        },
         "words": {
           "description": "List of words to be considered correct.",
           "items": {

packages/cspell-eslint-plugin/src/common/options.cts

@@ -41,6 +41,7 @@ export type CSpellOptions = Pick<
     | 'ignoreRegExpList'
     | 'includeRegExpList'
     | 'import'
+    | 'language'
     | 'words'
 > & {
     dictionaryDefinitions?: DictionaryDefinition[];

packages/cspell-eslint-plugin/src/common/options.test.cts

@@ -11,4 +11,11 @@ describe('options', () => {
         const settings: CSpellSettings = options.cspell;
         assert(settings, 'it is expected to compile.');
     });
+
+    test('Make sure `language` is allowed.', () => {
+        const options: Options = { ...defaultOptions, cspell: { language: 'en-gb' } };
+        assert(options.cspell);
+        const settings: CSpellSettings = options.cspell;
+        assert(settings, 'it is expected to compile.');
+    });
 });