/**
 * @fileoverview Rule to restrict what can be thrown as an exception.
 * @author Dieter Oberkofler
 */

'use strict';

const astUtils = require('./utils/ast-utils');

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

/** @type {import('../types').Rule.RuleModule} */
module.exports = {
  meta: {
    type: 'suggestion',

    docs: {
      description: 'Disallow throwing literals as exceptions',
      recommended: false,
      url: 'https://eslint.org/docs/latest/rules/no-throw-literal',
    },

    schema: [],

    messages: {
      object: 'Expected an error object to be thrown.',
      undef: 'Do not throw undefined.',
    },
  },

  create(context) {
    return {
      ThrowStatement(node) {
        if (!astUtils.couldBeError(node.argument)) {
          context.report({ node, messageId: 'object' });
        } else if (node.argument.type === 'Identifier') {
          if (node.argument.name === 'undefined') {
            context.report({ node, messageId: 'undef' });
          }
        }
      },
    };
  },
};