Fyper

Type-safe Cypher queries in F#.

type Person = { Name: string; Age: int }
type ActedIn = { Roles: string list }

let findActors = cypher {
    for p in node<Person> do
    for m in node<Movie> do
    matchRel (p -- edge<ActedIn> --> m)
    where (p.Age > 30)
    select (p.Name, m.Title)
}
// MATCH (p:Person) MATCH (m:Movie) MATCH (p)-[:ACTED_IN]->(m)
// WHERE p.age > $p0 RETURN p.name, m.title

Install

dotnet add package Fyper              # Core
dotnet add package Fyper.Neo4j        # Neo4j driver
dotnet add package Fyper.Age          # Apache AGE driver
dotnet add package Fyper.Parser       # Cypher parser

Guide

• Getting Started – first query in 5 minutes
• Relationships – matchRel, OPTIONAL MATCH, paths
• Mutations – CREATE, SET, DELETE, MERGE
• Transactions – atomic multi-query operations
• Parser – parse Cypher strings into AST

Reference

• CE Operations – all operations at a glance
• Functions – Cypher module API
• Types – AST, GraphValue, exceptions
• Neo4j Driver – setup and usage
• AGE Driver – PostgreSQL + AGE setup

Internals

• Architecture – data flow and modules
• Performance – benchmarks

Packages

Package	Deps	Description
Fyper	FSharp.Core	Query builder + compiler
Fyper.Parser	Fyper	Cypher string parser
Fyper.Neo4j	Neo4j.Driver	Neo4j Bolt driver
Fyper.Age	Npgsql	Apache AGE driver