no-unsealed-objects.js

const unsealedObjectError = () => 'Flow interprets empty objects literals as unsealed objects,' +
  ' see https://git.io/fj64j';

module.exports = {
  'no-unsealed-objects': {
    meta: {
      docs: {
        description: 'no unsealed objects',
        category: 'Possible Errors',
        recommended: false,
      },
      schema: [],
      fixable: 'code',
    },
    create: (context) => {
      // ignore fixture data
      const filename = context.getFilename();
      if (filename.match(/fixtures/)) return { ...null };

      return {
        ObjectExpression: (node) => {
          if (node.properties.length === 0) {
            context.report({
              node,
              message: unsealedObjectError(),
              fix: fixer => fixer.replaceText(node, '{ ...null }'),
            });
          }
        },
      };
    },
  },
};