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parsing library.\n\n## Usage\n\n### Online demo \nSimplified demonstration available [here](https://gbtb.github.io/elm-gen/).\n\n### CLI tool\nCLI tool can be obtained from [NPM](https://www.npmjs.com/package/elm-gen). After installation, you can used it like that:  \n`elm-gen decoders\u0026encoders Model.elm .`  \nCall above will produce new file ModelEncodersAndDecoders.elm, which will contain decoders and encoders for types present in Model.elm.  \nAlso note, that generated elm code for decoders uses NoRedInk elm-decode-pipeline package functions, so it must be installed into your project.  \nFor more examples you may also look at functional tests in ts/MainTests.ts and correspondent files in tests_data folder.\n## Features\n* elm-gen can generate decoders and/or encoders for user defined Record and Union types without type variables.\n* elm-gen supports basic elm types supported by Json.(Encode|Decode) plus tuples and Maybe's.\n* elm-gen can use hand-made decoders and encoders `Decoder X` and `X -\u003e Value` in order to generate decoders for types, dependent on type `X`\n* elm-gen will follow **explicit** import type references to look for type definitions doesnot present in current file\n* elm-gen dont require to break your Elm code in any way (its still compilable by `elm-make` without pre-processing), except for some [meta-comments](#meta-comments) insertion.\n\n### Config\nSome configuration (mostly about naming) can be applied from config json-file. Example of config can be found in tests_data folder.\nIt's correspondent Elm type representation resides in Config.elm\n\n### Meta-Comments\nElm-gen supports meta-comments in source code, in form of either `-- //Meta-Comment` or `{-| //Meta-Comment -}`.  \nFor now, there are 4 meta-comments:\n\n* Ignore -- elm-gen completely ignores next type definition (literally skipping it during parse stage).\n\n* DefaultValue -- use next pair of (value type def, value expr) to produce default value for `Json.Decode.Pipeline.optional` function.\nSupports values of types `defaultValue: UnionType` for union types, and `defaultValue : Record ` or `defaultValue : Record -\u003e Record` for record types.\n\n* NoDeclaration -- elm-gen won't generates type declaration for next type's decoder (usefull for preserving record structural typing ability for generated decoder )\n\n* Field name aliases - You can define aliases for some field names to avoid issues with elm reserved words, and to make some *special* field names (like `_id` and `_rev` which stored by Couchdb) normally looking in Elm representation. 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