FScript is a small, statically typed, embeddable language for the parts of your product that need to change faster than your application.
dotnet tool install --global MagnusOpera.FScript
YOUR APPtype Customer =
{ Name: string
Plan: string
Seats: int }
[<export>] let quote (customer: Customer) =
let basePrice =
match customer.Plan with
| "scale" -> 29
| "team" -> 19
| _ -> 9
basePrice * customer.SeatsWhy FScript
Most embedded scripting is a trade: power for safety, or simplicity for expressiveness. FScript gives you a compact ML-style language with static checks and an explicit capability boundary.
Language, meet product
Readable enough for a rule. Expressive enough for a workflow.
Records, unions, options, and exhaustive matching make business rules readable instead of fragile.
type Decision =
| Approve of int
| Review of string
| Decline
let decide score =
match score with
| n when n > 80 -> Approve 5000
| n when n > 55 -> Review "manual"
| _ -> DeclineScripts only reach the functions your host exposes. The integration boundary is explicit and typed.
let notifyLateInvoice invoice =
match invoice.Status with
| "late" ->
Host.notify invoice.Owner
$"Invoice {invoice.Id} is late"
| _ ->
()Load once, discover exports, and invoke them by name from .NET or JavaScript hosts.
type Event = { Kind: string }
[<export>] let route (event: Event) =
match event.Kind with
| "signup" -> "onboarding"
| "payment.failed" -> "billing"
| "churn.risk" -> "success"
| _ -> "archive"The host stays in charge
Core FScript has no secret door to your filesystem, network, or database. Your host exposes typed extern functions; scripts use exactly those capabilities and nothing more.
A gentler learning curve
No archaeology required. Start by changing a working example, learn the language as you need it, then connect your host.