static findVariableDeclarationAndNewExpressionNode(name, ast) {
    if (!name) return null;

    for (const node of ast.program.body) {
      if (node.type === 'VariableDeclaration' &&
        node.declarations[0].init &&
        node.declarations[0].init.type === 'NewExpression' &&
        node.declarations[0].id.name === name) {
        return node;
      }
    }

    return null;
  }
find VariableDeclaration node which has NewExpression.
@param {string} name - variable name.
@param {AST} ast - find in this ast.
@returns {ASTNode|null} found ast node.