nfun-cli

name	nfun-cli
description	Run NFun expressions via the Funny CLI. Use when you need to quickly test an NFun expression, check types, or trace TIC solver behavior. Prefer this over creating ad-hoc .cs test projects.
user-invocable	true
argument-hint	<expression>
allowed-tools	Bash

NFun CLI (Funny CLI)

Run NFun expressions using the console app at: src/ConsoleAppExample/ConsoleAppExample.csproj

Usage

# Evaluate an expression
dotnet run --project src/ConsoleAppExample/ConsoleAppExample.csproj --no-build -p:SignAssembly=false -- -e "$ARGUMENTS"

# Evaluate with TIC trace (shows constraint solving steps)
dotnet run --project src/ConsoleAppExample/ConsoleAppExample.csproj --no-build -p:SignAssembly=false -- -t -e "$ARGUMENTS"

Flags

Flag	Description
-e, --eval	Evaluate expression
-s, --script	Run script from file
-t, --trace	Show TIC solver trace output
-h, --help	Show help

Important

• Always use -p:SignAssembly=false (SNK key is missing)
• Use --no-build if you've recently built; otherwise omit it
• If you get assembly load errors, rebuild NFun first: dotnet build src/NFun/NFun.csproj -p:SignAssembly=false -f net6.0
• Multi-line expressions: use \r as line separator in the expression string
• The -t flag enables TraceLog.IsEnabled which shows all TIC solving phases: toposorted, PullConstraints, PushConstraints, Destructed, Finalized

Examples

# Simple expression
dotnet run ... -- -e "y = 1 + 2"

# Optional types
dotnet run ... -- -e "y = if(true) 42 else none"

# With trace to debug type inference
dotnet run ... -- -t -e "y = [1,none,3].map(rule it ?? 0)"

# Multi-line
dotnet run ... -- -e "f(x) = x * 2\r y = f(3)"