eslint-plugin-playlyfe/lib/plugins/js/rules/freeze-const-object.js

custom eslint stuff for playlyfe

"use strict";

const Rule = {
  meta: {
    docs: {
      description: 'Enforce use of Object.freeze for object contants.',
      category: 'best-practices',
      recommended: true
    },
    fixable: 'code',
    schema: []
  },

  create(context) {
    function checkIsConstantVariable(node) {
      const {
        id
      } = node;
      return id && id.type === 'Identifier' && isUpperCase(id.name);
    }

    function checkIsValueObject(node) {
      const {
        init
      } = node;
      return init && init.type === 'ObjectExpression';
    }

    function isUpperCase(val) {
      return val.toUpperCase() === val;
    }

    return {
      VariableDeclarator(node) {
        if (checkIsConstantVariable(node) && checkIsValueObject(node)) {
          context.report({
            node: node.init,
            message: 'Use Object.freeze to freeze constant object value',

            fix(fixer) {
              const value = context.getSourceCode().getText(node.init);
              return fixer.replaceText(node.init, `Object.freeze(${value})`);
            }

          });
        }
      }

    };
  }

};
module.exports = Rule;