polymer-lint/lib/rules/one-component.js

Polymer Linter

'use strict';

// Rule: one-component
/**
 * Checks if the file defines exactly one component.
 *
 * @function one-component
 * @memberof module:lib/rules
 * @param {Linter.LintStreamContext} context
 * @param {SAXParser} parser
 * @param {OnErrorCallback} onError
 * @return {void}
 */
module.exports = function oneComponent(context, parser, onError) {
  let count = 0;

  parser.on('domModuleStartTag', (id, attrs, selfClosing, location) => {
    count += 1;

    if (count > 1) {
      onError({
        message: `More than one component defined: ${ id }`,
        location
      });
    }
  });
};