slang_flutter

• feat: respect all locale preferences of the device instead of only the first locale
• feat: add --preserve-order flag to slang apply
• fix: compilation error when using region extension as a super set of the parent locale

• feat: Region Extensions, de-CH will fall back to de before falling back to the base locale
• feat: Wildcard Locales, [any]-DE.json will spread to all existing language codes, useful to set a currency for a region without managing every combination of language and region (e.g. en-DE, fr-DE, de-DE)
• feat: add Arabic plural resolver

• feat: allow nested namespaces
• feat: automatically fix common casing typos during slang wip apply based on existing translations and majority vote
• feat(mcp): allow specifying @@notes in translation files to give LLMs more context

• feat: add generate_mixin to interfaces config to allow predefined mixins instead of generating new ones (#347)
• feat: support build_runner build --workspace, requires build_runner: ^2.12.1 (#348)
• deps: replace csv with serial_csv
• DEPRECATED: Do not specify paths for interfaces in config, use interface modifier in the translation keys instead (e.g. myKey(interface=MyInterface))

• feat: also format base locale when running slang normalize (#344) @adil192
• feat: format yaml files like in Weblate (#343) @adil192
• chore: migrate from GitHub to Codeberg: https://codeberg.org/Tienisto/slang

• feat: announcing slang_mcp, a new package to work with LLMs more efficiently
• fix: $wip should handle nested parenthesis

• feat: add t.$wip('Welcome $name') or t.$wip.welcome.title('Welcome $name') for key-less prototyping without code generation
• feat: add dart run slang wip apply to add the translations to resources and update the Dart code accordingly
• feat: generate the flat map in a single function (#325) @mrgnhnt96

• feat: simplify ${arg} to $arg if possible
• feat: make internal translation class instance final

• feat: add // dart format off for generated files (#320) @adil192
• feat: flat map uses switch expressions instead of statements (#323) @mrgnhnt96

Added support for custom contexts.
Example:

{
  "greet": {
    "male": "Hello Mr $name",
    "female": "Hello Ms $name"
  }
}

String a = t.greet(name: 'Anna', context: GenderContext.female);

For more information, see README.

• feat: combine namespaced and non-namespaced translations (#311)
• feat: reduce CLI logging (#315)

Detect pluralization automatically, configure it via pluralization->auto: cardinal / ordinal

• feat: add autodoc feature enabled by default that generates the base translation as documentation for the translation keys (#218)
• feat: slang analyze supports --source-dirs (#309) @khoadng
• feat: slang configure supports --source-dirs (#308) @khoadng
• fix: correctly preserve identation of YAML output (#299) @adil192
• deps: loosen build constraint in slang_build_runner

• feat: add option to turn off flat map generation via flat_map: false
• feat: add fallback_strategy configuration, possible values strict (default), base_locale
• feat: auto rebuild flutter pub run fast_i18n watch (experimental)
• fix: escape parameters with backslash correctly

• feat: remove json2yaml dependency, reimplement a simple opinionated YAML writer

• feat: add Translations.$copyWith() and TranslationMetadata.getOverride to allow adding custom behavior (#287)
• feat: add Japanese plural resolver (#289)

• feat: add dart run slang configure to configure CFBundleLocalizations in Info.plist based on existing translation files
• feat: add -h / --help / help command
• feat: add global generate_enum config (#283)
• fix: add unused_element_parameter to avoid warnings in Dart 3.7 (#282)

• feat: remove hint when overriding plural resolvers (were too verbose)
• feat: generated plural resolvers fallback to default quantity if null
• feat: add zero quantity to cs, de, en and vi (not breaking)
• docs: it is now recommended to put this library into dev_dependencies

• feat: add (fallback) modifier to fallback entries within a map (#268)
• fix: empty strings in base translations should not be removed when using fallback_strategy: base_locale_empty_string

• feat: add Flutter 1.x.x support, build_runner detects this automatically, otherwise set null_safety: false in build.yaml
• feat: flutter pub run fast_i18n ignores build.yaml files without fast_i18n entry
• fix: add type hint for _renderedResolvers

• feat: simplify file names without namespaces (#267)
• DEPRECATED: Do not use namespaces in file names when namespaces are disabled: strings_de.json -> de.json
• DEPRECATED: Always specify the locale in the file name (namespace enabled): strings.json -> strings_en.json, except the locale is specified in the directory name

Note: This might make the files order in your IDE less pleasant if input and output files are in the same directory.
You can specify the output directory to a subdirectory to avoid this.
For example, output_directory: lib/i18n/gen

• feat: plural resolvers can now be overwritten
• fix: make params distinct
• fix: sort locales correctly (base first, then alphabetically)

• feat: automatically sanitize invalid keys (e.g. continue, 123) (#257)
• fix: do not override locale in L10n format definition

• feat: add pluralization support
• feat: AppLocale has a new property called flutterLocale
• feat: new command flutter pub run fast_i18n which is much faster than flutter pub run build_runner build --delete-conflicting-outputs

• feat: add format config to automatically format generated files (#184)
• fix: correctly generate with enum_name and class_name different from AppLocale / Translations (#254)

A rebuild is needed: flutter pub run build_runner build.

• feat: the generated file is now self-contained, it works even if you remove this library!
• feat: add stats and timestamp to the generated file
• fix: parse files with underscore only (e.g. strings_en_US)
• fix: parse files with script tag (e.g. strings_zh-Hant-TW)
• perf: generate LocaleSettings.supportedLocales statically without library call
• perf: remove switch call in Translations.of(context).
• docs: updates in generated file
• docs: update README

DateFormat, NumberFormat, and Lazy loading

Format translations with DateFormat and NumberFormat:

Hello {name}, today is {today: yMd}. You have {money: currency(symbol: '€')}.

On web, Deferred loading is used to reduce initial load time.

• feat: add DateFormat and NumberFormat support (#112)
• feat: add lazy: true config which is enabled by default (#135)
• fix: slang analyze should not treat translations as unused if they are used in linked translations (#231)
• fix: slang analyze should detect missing enums (#234)
• fix: trim enum keys in compressed format while parsing (e.g. "male, female": "..." to "male,female": "...") (#247)
• fix: compilation error on web when using large interfaces (#251)
• fix: correctly transform keys with modifiers when key_case is set (#253)
• Breaking: Require Dart 3.3 and Flutter 3.19
• Breaking: setLocale, setLocaleRaw, and useDeviceLocale returns a Future, use -Sync suffix for synchronous calls
• Breaking: output_format removed, always generates multiple files now
• Breaking: deprecated functions in LocaleSettings (supportedLocales, supportedLocalesRaw) removed
• Breaking: defining contexts (enums) is no longer allowed in build.yaml or slang.yaml (deprecated in v3.19.0)
• Breaking: enums specified in context are no longer transformed into pascal case keeping the original case

You can read the detailed migration guide here.

The typed version is now first class.

• Breaking: setLocale -> setLocaleRaw, setLocaleTyped -> setLocale
• Breaking: locales -> supportedLocalesRaw
• Breaking: AppLocale.toLanguageTag -> AppLocale.languageTag
• Breaking: translation classes are now private by default, you can configure it via translation_class_visibility in build.yaml (in most cases just keep it private!)
• plain strings are now implemented using getters, edit -> rebuild i18n -> hot reload works now for faster development

• feat: add dart run slang normalize to normalize translations based on base locale @Tienisto
• feat: add parameter type support (introduced 3.30.0) to ARB files (#214) @Tienisto
• feat: sort translation files for reproducible console output (#210) @poppingmoon

• feat: add parameter types (e.g. Hello {name: String}, you are {age: int} years old); is Object by default @Tienisto
• fix: handle nested interfaces (#191) @Tienisto
• refactor: move code to src folder @Tienisto

• feat: dart run slang analyze supports csv files (#185) @nikaera
• feat: also add linter and coverage ignore to part files (#188) @cmenkemeller
• fix: generate base translations as fallback when using context enums where some enum values are missing (#182) @Tienisto
• fix: generate correct part of directive when using a custom dart file extension (#187) @cmenkemeller

• feat: add fallback_strategy: base_locale_empty_string to also treat empty strings as missing translations (#180)
• fix: special case where linked translations had invalid parenthesis (#181)

• feat: add support for ARB files (#179)

• fix: should not escape special characters when parsed via the "Translation Overrides" feature (#177)

• fix: generate correct compatibility typedef for Translations class (#176)

• feat: base translation class is named Translations so that Translations.of(context) returns the same type (#169)
• feat: the name Translations can be configured via class_name (@bjernie, #174)
• feat: add statistics configuration (similar to timestamp) to hide statistics in generated file

• feat: add dart run slang clean to remove unused translations after running slang analyze (#141)
• feat: add --exit-if-changed to slang analyze to fail CI if there are missing / unused translations (#141)
• fix: code generator should not crash if context is not included in i18n (#165)
• fix: should not generate contextBuilder and nBuilder parameter in rich text if not needed (#168)

• feat: slang edit add respects order in base locale (@adil192)
• feat: slang edit add works without a specified locale, it will add the string to all locales
• feat: use WidgetsBinding.instance.platformDispatcher instead of PlatformDispatcher.instance in findDeviceLocale implementation
• fix: correctly obfuscate line breaks and single quotes

• feat: support multiple TranslationProvider at the same time when using multiple packages
• fix: trailing slash in config does not work with build_runner
• i18n: Swedish plural resolver improvement

Contributions

• fix: Handle negative values properly in Swedish. (#156) @lohnn

• feat: announcing slang_gpt, a new package to generate translations with GPT

• feat: add input directory as comment to generated files
• fix: migrate away from deprecated WidgetsBinding.instance.window in findDeviceLocale implementation
• fix: handle empty maps in _missing_translations in yaml format (#152) (by @adil192)

• feat: add slang edit add (short: slang add) to add new translations (#150) (by @adil192)

• feat: add enum value inference (no need to specify enum in the config anymore)
• feat: add slang edit copy to copy translations
• feat: namespaces may contain underscores if at least one file of same directory uses locale from directory name
• DEPRECATED: Use explicit context modifier instead of relying on the config file (see migration guide)

• feat: add slang edit to move or delete translations over all locales
• fix: avoid infinite loop of symlinks

• fix: setLocale does not work when Locale enum is from two packages (by @fzyzcjy)
• fix: slang outdated should skip missing translations instead of throwing an error

• feat: add obfuscation config to obfuscate translation strings

• feat: add OUTDATED modifier to flag translations as outdated (slang analyze will treat them as missing)
• feat: run flutter pub run slang outdated my.key.path to flag translations as outdated
• feat: slang apply prefers modifiers from base locale over secondary locales

• feat: LocaleSettings.useDeviceLocale listens to device locale changes
• feat: flutter pub run slang apply only applies changed locales by default
• fix: locale selection with script code (e.g. zh-Hant-TW uses zh-TW instead of zh-HK)

• feat: generated files from analyze and apply have \n at the end of the file

• feat: mixins generated by the interface feature have == and hashCode overrides
• feat: flutter pub run slang apply respects the order in the base locale instead of simply add the new translations to the end
• feat: flutter pub run slang analyze have --split-missing and --split-unused (in addition to --split) so only one of both can be a single file

• feat: add (ignoreMissing) and (ignoreUnused) modifiers which changes the behaviour of flutter pub run slang analyze

• feat: there is now a default plural resolver so the app keeps working in production when you forgot to define one, you will only see a warning in the log
• fix: key_map_case should work with (map) modifier

• feat: improve interface attribute inference algorithm
• feat: generate to lib/gen/<filename> in Flutter environment by default if input is outside of lib/ and no output directory is given

• feat: add (interface=<Interface>) and (singleInterface=<Interface>) modifiers, a new approach to configure interfaces without touching the config file
• feat: add AppLocaleUtils.supportedLocales and AppLocaleUtils.supportedLocalesRaw, this API works in locale_handling: false
• fix: possible class name conflict for objects inside lists
• DEPRECATED: LocaleSettings.supportedLocales and LocaleSettings.supportedLocalesRaw

• feat: official web support

• feat: RichText supports links inside default translation
• feat: flutter pub run slang watch works recursively and does not crash on error

• feat: csv decoding now support both CRLF and LF, " and '
• fix: LocaleSettings.setPluralResolver should not throw an assertion error
• fix: flutter pub run slang migrate should also work without : in command

• feat: add --locale=<locale> argument to flutter pub run slang apply to only apply a specific locale
• BREAKING (TOOL): --flat argument for flutter pub run slang analyze and apply is no longer available

• feat: flutter pub run slang analyze now also checks unused translations (on top of missing translations)
• docs: prefer slang analyze over slang:analyze (and for all other commands); both styles are supported however

• feat: add command flutter pub run slang:apply to add translations from the slang:analyze result
• fix: handle isFlatMap parameter when overriding translations correctly
• fix: update arb migration tool to respect new modifier syntax

• feat: add command flutter pub run slang:analyze to report missing translations

Translation Overrides and Enhanced Modifiers

• feat: it is now possible to override translations via LocaleSettings.overrideTranslations (checkout updated README)
• feat: there is a new modifier syntax which allows for multiple modifiers e.g. myKey(plural, rich)
• feat: improve file scan (now only checks top-level directory for any config files)
• Breaking: default plural parameter is now n; you can revert this by setting pluralization/default_parameter: count
• Breaking: custom plural/context parameter must follow syntax apples(param=appleCount)

All breaking changes will result in a compile-time error, so don't worry for "hidden" bugs :)

You can read the detailed migration guide here.

New Features:

• null safety support
• add type-safe functions LocaleSettings.setLocaleTyped and LocaleSettings.currentLocaleTyped

Breaking:

• output_translate_var renamed to translate_var in build.yaml config file

• feat: add AppLocaleUtils.parseLocaleParts
• fix: LocaleSettings.useDeviceLocale now does not complain of weird locales on Linux
• fix: rich text now handles all characters
• fix: rich text properly applies param_case
• fix: empty nodes are rendered as classes instead of claiming them as plurals

• feat: ignore empty plural / context nodes when fallback_strategy: base_locale is used
• feat: add coverage:ignore-file to generated file and ignore every lint