eslint-plugin-ft-flow/dist/utilities/isFlowFile.js.flow

Flowtype linting rules for ESLint by flow-typed

import isFlowFileAnnotation from './isFlowFileAnnotation';

/**
 * Checks whether a file has an @flow or @noflow annotation.
 *
 * @param context
 * @param [strict] - By default, the function returns true if the file
 *  starts with @flow but not if it starts by @noflow. When the strict flag
 *  is set to false, the function returns true if the flag has @noflow also.
 */
export default (context, strict = true) => {
  const comments = context.getSourceCode().getAllComments();

  if (!comments.length) {
    return false;
  }

  return comments.some((comment) => isFlowFileAnnotation(comment.value, strict));
};