What is a .FSI file?
The file extension .FSI stands for Visual F# Signature File. This type of file is associated with Visual F#, which is a part of Microsoft Visual Studio, a software development kit. An .FSI file contains important information about the public signatures of elements in an F# program. These elements include types, namespaces, and various components that make up the program.
In simpler terms, an .FSI file helps define what parts of the F# program can be accessed by other parts of the program or by other programs. It acts like a list of rules that specify who can see or use certain parts of the code in the program. This is particularly useful for managing large codebases, where you might want to keep some information private or restricted.
To open an .FSI file, you would typically use Microsoft Visual Studio 2022 or newer versions. This program provides the necessary tools to view, edit, and manage .FSI files effectively.
Additionally, .FSI files are closely linked to .FS files, which contain the actual F# program code. The .FSI file usually shares the same name as its corresponding .FS file but with the .FSI extension. This naming convention helps in identifying which signature file corresponds to which F# program file. The use of .FSI files is a way to set boundaries and rules for accessibility to the code written in the .FS files, helping to control how the code interacts with other parts of the program or with external programs.
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