Frontbacked Domain Specific Language (FDSL)

This directory contains the source code for the Frontbacked Domain Specific Language (FDSL) compiler and runtime.

Role in the Platform

FDSL is a backend control and definition language used to secure websites created on the Frontbacked platform. It serves a similar purpose to Firebase Security Rules.

• Security & Validation: Every theme includes a .rules file written in FDSL. The backend uses this to infer the types of data accepted from the frontend and to define granular access controls—specifying who can read, write, or delete data and under what conditions.
• Inference: The system uses FDSL to automatically determine data schemas and validation logic, ensuring that incoming data from the frontend adheres to the developer's specifications.

Syntax & Features

FDSL allows developers to define rules based on the user's authentication state, the data being accessed, and other contextual information.

Technical Details

• Components: Includes a lexer, parser, and compiler to transform .rules files into executable validation logic.
• Language: Built with TypeScript.
• Integration: Used by both frontbacked-worker (for production enforcement) and frontbacked-server (for local development testing).