Method classDeclarationExtendsNull

internal/checker/checker.go:12249–12254

** * Check if the given class-declaration extends null then return true. * Otherwise, return false * @param classDecl a class declaration to check if it extends null */

(classDecl *ast.Node)

 * @param classDecl a class declaration to check if it extends null
 */
func (c *Checker) classDeclarationExtendsNull(classDecl *ast.Node) bool {
	classSymbol := c.getSymbolOfDeclaration(classDecl)
	classInstanceType := c.getDeclaredTypeOfSymbol(classSymbol)
	baseConstructorType := c.getBaseConstructorTypeOfClass(classInstanceType)
	return baseConstructorType == c.nullWideningType
}

func (c *Checker) checkAssertion(node *ast.Node, checkMode CheckMode) *Type {
	if node.Kind == ast.KindTypeAssertionExpression {