For other CodeQL resources, including tutorials and examples, see the CodeQL documentation

DefUse

Module DefUse

Provides classes and predicates for working with variable definitions and uses.


                                import semmle.javascript.DefUse

Provides classes for working with JavaScript programs, as well as JSON, YAML and HTML.

definitionReaches	Holds if the definition of `v` in `def` reaches `use` along some control flow path without crossing another definition of `v`. DEPRECATED: Use the `SSA.qll` library instead.
localDefinitionOverwrites	Holds if the `later` definition of `v` could overwrite its `earlier` definition.
localDefinitionReaches	Holds if the definition of local variable `v` in `def` reaches `use` along some control flow path without crossing another definition of `v`. DEPRECATED: Use the `SSA.qll` library instead.

LValue	A variable reference or property access that is written to.
RValue	A variable reference or property access that is read from.
RefExpr	An expression that can be evaluated to a reference, that is, a variable reference or a property access.
VarDef	A ControlFlowNode that defines (that is, initializes or updates) variables or properties.
VarUse	A ControlFlowNode that uses (that is, reads from) a single variable.