CodeQL library for JavaScript

Module ExprHasNoEffect

Provides classes and predicates for the ‘js/useless-expression’ query.

Import path

import Expressions.ExprHasNoEffect

Imports

DOMProperties	Provides predicates for working with the DOM type hierarchy.
javascript	Provides classes for working with JavaScript programs, as well as JSON, YAML and HTML.
xUnit	Provides classes for working with xUnit.js tests.

Predicates

hasNoEffect	Holds if the expression `e` should be reported as having no effect.
inVoidContext	Holds if `e` appears in a syntactic context where its value is discarded.
isDeclaration	Holds if `e` is of the form `x;` or `e.p;` and has a JSDoc comment containing a tag. In that case, it is probably meant as a declaration and shouldn’t be flagged by this query.
isGetterProperty	Holds if there exists a getter for a property called `name` anywhere in the program.
isIndirectEval	Holds if `c` is an indirect eval call of the form `(dummy, eval)(...)`, where `dummy` is some expression whose value is discarded, and which simply exists to prevent the call from being interpreted as a direct eval.
isReceiverSuppressingCall	Holds if `c` is a call of the form `(dummy, e[p])(...)`, where `dummy` is some expression whose value is discarded, and which simply exists to prevent the call from being interpreted as a method call.
noSideEffects	Holds if evaluating `e` has no side effects (except potentially allocating and initializing a new object).

Classes

GetterPropertyAccess

A property access that may invoke a getter.