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:

N where
  flow.FileDeclaration {
    file = "project/myfile.js",
    declaration = {
      memberDecl = {
        name = N
      }
    }
  }

To learn about Angle, start with the Guide.