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{
  id: "fantomas-configuration-file/index.md",
  slug: "fantomas-configuration-file",
  body: "\nHi all,\n\nThe cat's out of the bag:\n\n<blockquote class=\"twitter-tweet\"><p lang=\"en\" dir=\"ltr\">New version of <a href=\"https://twitter.com/IonideProject?ref_src=twsrc%5Etfw\">@IonideProject</a> is out - it updates Fantomas support to the latest version including support for Fantomas configuration file (<a href=\"https://t.co/Pw3TqQ4kYe\">https://t.co/Pw3TqQ4kYe</a>)<br><br>Props to <a href=\"https://twitter.com/verdonckflorian?ref_src=twsrc%5Etfw\">@verdonckflorian</a> and <a href=\"https://twitter.com/ChetHusk?ref_src=twsrc%5Etfw\">@ChetHusk</a> for working on this. <a href=\"https://twitter.com/hashtag/fsharp?src=hash&amp;ref_src=twsrc%5Etfw\">#fsharp</a> <a href=\"https://twitter.com/hashtag/toolingAdventures?src=hash&amp;ref_src=twsrc%5Etfw\">#toolingAdventures</a></p>&mdash; Krzysztof Cieślak (@k_cieslak) <a href=\"https://twitter.com/k_cieslak/status/1215239179472375808?ref_src=twsrc%5Etfw\">January 9, 2020</a></blockquote> <script async src=\"https://platform.twitter.com/widgets.js\" charset=\"utf-8\"></script>\n\nFantomas now has support for configuration files.\nThis means you can override the default settings using a JSON file.\nCheck out [the documentation](https://github.com/fsprojects/fantomas/blob/master/docs/Documentation.md#--config-path-to-file-or-folder) for more information.\n\n![Fantomas configuration via console](./nojaf-fantomas-configuration-console.png)\n\nIn this post I wish to answer a couple of small questions about the Fantomas configuration files.\n\n## JSON schema?\n\nWe've added a JSON schema definition to [http://schemastore.org](http://json.schemastore.org/fantomas).\nSo to get intellisense in most editors, you can add `$schema` to the configuration file.\n\n```json\n{\n  \"$schema\": \"http://json.schemastore.org/fantomas\",\n  \"KeepNewlineAfter\": false,\n  \"IndentOnTryWith\": true\n}\n```\n\n## Ionide integration?\n\nWhen using the latest Ionide version (4.4.3 and higher), your configuration will be picked up due to the integration of Fantomas via [FSAutocomplete](https://github.com/fsharp/FsAutoComplete/).\n\nIf something doesn't work out, you can enable verbose logging in VSCode.\n\n```json\n{\n  \"FSharp.verboseLogging\": true\n}\n```\n\nThen you can see warnings or errors in the output window.\nA fallback to the default configuration will happen when the parsing failed.\n\nFor example:\n\n![Warning in Ionide](./nojaf-fantomas-configuration-ionide-warning.png)\n\n### Room for improvement\n\nAt the time of writing, the configuration file is [not cached in FSAutocomplete](https://github.com/fsharp/FsAutoComplete/blob/52779750677d20b13ebcacc64a212cbc2a87fa7d/src/FsAutoComplete/FsAutoComplete.Lsp.fs#L982).\nIt could be kept in memory and updated when a configuration file changes.\nFeel free to submit a pull request to FSAutocomplete.\n\n## Why a beta version?\n\nThe main reason this is not an official release just yet is due to the fact that we want to be sure this works out for everyone.\nSo **please provide us feedback** if you encounter any problems whatsoever.\n\n## Rider support?\n\nIf the solution we have in mind appears to be working out nicely for Ionide users, I will submit a pull request to [JetBrains/fsharp-support](https://github.com/JetBrains/fsharp-support).\nIt might involved some more thinking to find the best approach, however I'm confident in collaboration with the team we can find a way.\n\nPlease keep in mind that Fantomas updates to Rider are linked to their release cadence.\n\n## Road to adoption?\n\nThis year my personal aspiration to **increase the adoption of Fantomas**.\nBoth in terms of users and people who submit pull requests.\n\nI have some plans and ideas for this. Unfortunately, I'm unable to share anything just yet.\nStay tuned for more!\n\nPlease o please report any issues you encounter using [our online tool](https://jindraivanek.gitlab.io/fantomas-ui/#?fantomas=preview).\nOr post any suggestions on [GitHub](https://github.com/fsprojects/fantomas/issues).\n\n> Fantomas can only improve when feedback is presented\n\nTake care everyone!\n\nCheers,\n\nnojaf\n\nPhoto by <a style=\"background-color:black;color:white;text-decoration:none;padding:4px 6px;font-family:-apple-system, BlinkMacSystemFont, &quot;San Francisco&quot;, &quot;Helvetica Neue&quot;, Helvetica, Ubuntu, Roboto, Noto, &quot;Segoe UI&quot;, Arial, sans-serif;font-size:12px;font-weight:bold;line-height:1.2;display:inline-block;border-radius:3px\" href=\"https://unsplash.com/@krutainis?utm_medium=referral&amp;utm_campaign=photographer-credit&amp;utm_content=creditBadge\" target=\"_blank\" rel=\"noopener noreferrer\" title=\"Download free do whatever you want high-resolution photos from Ivars Krutainis\"><span style=\"display:inline-block;padding:2px 3px\"><svg xmlns=\"http://www.w3.org/2000/svg\" style=\"height:12px;width:auto;position:relative;vertical-align:middle;top:-2px;fill:white\" viewBox=\"0 0 32 32\"><title>unsplash-logo</title><path d=\"M10 9V0h12v9H10zm12 5h10v18H0V14h10v9h12v-9z\"></path></svg></span><span style=\"display:inline-block;padding:2px 3px\">Ivars Krutainis</span></a>\n",
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