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Translations implement _interfaces_, so:\n    - you cannot use a incorrect message, since the compiler allows only declared message keys.\n    - you cannot forget a translation, since all the compiler will enforce you to implement it.\n\n## Installation\n\nAdd `@rr0/lang` as a dependency to your project:\n\n```\nnpm install @rr0/lang --save\n```\n\nso that you can\n\n```\nimport * from \"@rr0/lang\"\n```\n\nin your code.\n\n## Usage\n\n1. Create a common interface for your messages in every language. :\\\n   `interface MyMessages extends KeyValue { hello: string; bye: string; }`\n   }`\n2. Create implementations of this interface with translations values:\\\n   `class MyFrenchMessages implements MyMessages { hello = \"Bonjour ${name}\"; bye = \"Au revoir\"}`\n3. Create a Translator with a given target language and grammar: \\\n   `frTranslator = new Translator(\"fr\", grammar_fr)`\n4. Translate a message: `bonjour = frTranslator.translate(myFrMessages.hello, {name: \"Jérôme\"})`\n\n### Plural support\n\nYou can use `${var:plural}` variant in a placeholder to force plural. The translator will then use the provided grammar\nrules to render the message.\n\n### Translations\n\nBy default, messages and translators are separated, but you can use a `Translation`, which is a `Translator` that holds\nits messages.\n\n## Example\n\nSay we want to translate some message in two locales:\n\n```ts\nimport {Translator, grammar_en, grammar_fr} from '@rr0/lang'\n\n// #1\ninterface MyMessages extends KeyValue {\n  key1: string\n}\n\n// #2\nclass EnglishMessages implements MyMessages {\n  key1 = 'several ${param1:plural} and ${param2:plural} but one single ${param1} and ${param2}'\n}\nclass FrenchMessages implements MyMessages {\n  key1 = 'plusieurs ${param1:plural} et ${param2:plural} mais un seul ${param1} et ${param2}'\n}\n\n// #3\nconst messages_en = new EnglishMessages()\nconst translator_en = new Translator('en', grammar_en)\n\nconst messages_fr = new FrenchMessages()\nconst translator_fr = new Translator('fr', grammar_fr)\n\n// #4\nconst translated_en = translator_en.translate(messages_en.key1, {\n  param1: 'thing',\n  param2: 'party'\n})\n// translated_en = \"several things and parties but one single thing and party\"\n\nconst translated_fr = translator_fr.translate(messages_fr.key1, {\n  param1: 'cigare',\n  param2: 'cheval'\n})\n\n// translated_fr = \"plusieurs cigares et chevaux mais un seul cigare et cheval\"\n```\nA `Translation` is a `Translator` that holds its messages. For instance:\n```js\nconst messages = { dict: { key: 'value is ${param}' } }\nconst translation = new Translation('fr', grammar_fr, messages)\ntranslation.add('newKey', 'new value is ${param}')\nconst translated = translation.translate(translation.messages.dict['newKey'], { param: 'paramValue' })\n// translated = \"new value is paramValue\"\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Frr0%2Flang","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Frr0%2Flang","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Frr0%2Flang/lists"}