The PsiLambdaExpression in the IntelliJ IDEA

Question

Is there a ready-made solution (utility) to get the lambda interface (Function, Predicate, Supplier, Consumer, etc.) from PsiLambdaExpression?

Answer 1

import com.intellij.psi.LambdaUtil;

PsiType functionalInterfaceType = LambdaUtil.getFunctionalInterfaceType(expression, true); // expression: Map<Object, Object> map -> map.get(1)
functionalInterfaceType.getCanonicalText(); // java.util.function.Function<? super java.util.HashMap<java.lang.Object,java.lang.Object>,?>

or

expression.getFunctionalInterfaceType();