Function isTypeDerivedFrom

test/fixtures/snapshot/typescript.js:63853–63860

(source, target)

        // Note that this check ignores type parameters and only considers the
        // inheritance hierarchy.
        function isTypeDerivedFrom(source, target) {
            return source.flags & 1048576 /* TypeFlags.Union */ ? ts.every(source.types, function (t) { return isTypeDerivedFrom(t, target); }) :
                target.flags & 1048576 /* TypeFlags.Union */ ? ts.some(target.types, function (t) { return isTypeDerivedFrom(source, t); }) :
                    source.flags & 58982400 /* TypeFlags.InstantiableNonPrimitive */ ? isTypeDerivedFrom(getBaseConstraintOfType(source) || unknownType, target) :
                        target === globalObjectType ? !!(source.flags & (524288 /* TypeFlags.Object */ | 67108864 /* TypeFlags.NonPrimitive */)) :
                            target === globalFunctionType ? !!(source.flags & 524288 /* TypeFlags.Object */) && isFunctionObjectType(source) :
                                hasBaseType(source, getTargetType(target)) || (isArrayType(target) && !isReadonlyArrayType(target) && isTypeDerivedFrom(source, globalReadonlyArrayType));
        }
        /**
         * This is *not* a bi-directional relationship.
         * If one needs to check both directions for comparability, use a second call to this function or 'checkTypeComparableTo'.