.fsi
1 claimant
1 primary
0 secondary
unambiguous primary
SWH popularity
Distinct files in the full Software Heritage archive (2026-06-04 export), dated by first appearance, following Desmazières, Di Cosmo, Lorentz (MSR 2025). Case-aggregated. citation.
48.6K
total files
16.2K
first seen 2021–2025 (33.3%)
2018
median year (half its files since)
Case variants in archive: .fsi (48.6K), .FSI (25), .Fsi (2) — aggregated above.
Attribution status
This extension is attributed to F# as primary by 1 authoritative claim.
Authoritative sources: △ Linguist · secondary △ Pygments · secondary ✓ Wikidata · Q648619 ✗ Wikipedia · no claim
Claimants (3)
Languages that list
.fsi among their extensions. Strength reflects whether the upstream source treated it as their primary extension.| Language | Source | Strength |
|---|---|---|
| F# | wikidata | primary |
| F# | linguist | secondary |
| F# | pygments | secondary |
SWH-mined examples (0)
No archived examples for .fsi in our local mirror yet.