CodeQL JavaScript AST CheatSheet

https://codeql.github.com/codeql-standard-libraries/javascript/semmle/javascript/Expr.qll/type.Expr$Property.html

var p = {
  x: 1,                                                          // value property
  y: 1,                                                          // value property
  diag: function() { return this.x - this.y; },                  // value property
  get area() { return this.x * this.y; },                        // property getter
  set area(a) { this.x = Math.sqrt(a); this.y = Math.sqrt(a); }  // property setter
}