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Oct 16, 2025
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Document relative path limitation and add cross-platform examples for F# Interactive #i directive #49118

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Add clarification about relative paths in F# Interactive #i directive
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Update frontmatter with AI usage and current date
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14 changes: 10 additions & 4 deletions docs/fsharp/tools/fsharp-interactive/index.md
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---
title: F# Interactive (dotnet) Reference
description: Learn how F# Interactive (dotnet fsi) is used to run F# code interactively at the console or to execute F# scripts.
ms.date: 11/29/2020
ms.date: 10/13/2025
f1_keywords:
- VS.ToolsOptionsPages.F#_Tools.F#_Interactive
ai-usage: ai-assisted
---
# Interactive programming with F\#

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### Specifying a package source

You can also specify a package source with the `#i` command. The following example specifies a remote and a local source:
You can also specify a package source with the `#i` command. The following examples specify a remote source and local sources on different operating systems:

```fsharp
#i "nuget: https://my-remote-package-source/index.json"
#i """nuget: C:\path\to\my\local\source"""
#i "nuget: /Users/username/path/to/my/local/source"
#i "nuget: /home/username/path/to/my/local/source"
```

This will tell the resolution engine under the covers to also take into account the remote and/or local sources added to a script.
This tells the resolution engine to take into account the remote and/or local sources added to a script.

You can specify as many package references as you like in a script.
You can specify as many package sources as you like in a script.

> [!IMPORTANT]
> Relative paths aren't currently supported with the `#i` directive. You must use absolute paths for local package sources. This limitation is tracked in [dotnet/fsharp#12969](https://github.com/dotnet/fsharp/issues/12969). As a workaround, construct absolute paths programmatically using `__SOURCE_DIRECTORY__` combined with `System.IO.Path.Combine()`, and then manually specify the full absolute path in your script.

> [!NOTE]
> There's currently a limitation for scripts that use framework references (e.g.`Microsoft.NET.Sdk.Web` or `Microsoft.NET.Sdk.WindowsDesktop`). Packages like Saturn, Giraffe, WinForms are not available. This is being tracked in issue [#9417](https://github.com/dotnet/fsharp/issues/9417).
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