eslint-plugin-ft-flow/dist/rules/spreadExactType.js.flow

Flowtype linting rules for ESLint by flow-typed

const schema = [
  {
    enum: ['always', 'never'],
    type: 'string',
  },
];

const create = (context) => ({
  ObjectTypeAnnotation(node) {
    const { properties } = node;

    for (const property of properties) {
      const { type } = property;
      if (type === 'ObjectTypeSpreadProperty') {
        const { argument: { type: argumentType, id: argumentId } } = property;
        if (
          argumentType !== 'GenericTypeAnnotation' || argumentId.name !== '$Exact') {
          context.report({
            message: 'Use $Exact to make type spreading safe.',
            node,
          });
        }
      }
    }
  },
});

export default {
  create,
  meta: {
    schema,
  },
};