Angle Introduction

Angle is Glean’s schema and query language. It is a declarative query language based on logic programming and Datalog, and is designed to be particularly suited for finding and extracting data from Glean.

To give you a flavour of the query language, here is how we could return the names of all the member declarations defined in a JavaScript file project/myfile.js:

D.declaration.memberDecl?.name
  where
    D : flow.FileDeclaration;
    D.file = src.File "project/myfile.js"

To learn about Angle, start with the Guide.