text: "use strict";
  
  const beforeBlockString = require("../../utils/beforeBlockString");
  const blockString = require("../../utils/blockString");
  const hasBlock = require("../../utils/hasBlock");
  const hasEmptyBlock = require("../../utils/hasEmptyBlock");
  const nextNonCommentNode = require("../../utils/nextNonCommentNode");
  const rawNodeString = require("../../utils/rawNodeString");
  const report = require("../../utils/report");
  const ruleMessages = require("../../utils/ruleMessages");
  const validateOptions = require("../../utils/validateOptions");
  const whitespaceChecker = require("../../utils/whitespaceChecker");
  
  const ruleName = "block-opening-brace-newline-after";
  
  const messages = ruleMessages(ruleName, {
    expectedAfter: () => 'Expected newline after "{"',
    expectedAfterMultiLine: () =>
      'Expected newline after "{" of a multi-line block',
    rejectedAfterMultiLine: () =>
      'Unexpected whitespace after "{" of a multi-line block'
  });
  
  const rule = function(expectation) {
    const checker = whitespaceChecker("newline", expectation, messages);
  
    return (root, result) => {
      const validOptions = validateOptions(result, ruleName, {
        actual: expectation,
        possible: ["always", "always-multi-line", "never-multi-line"]
      });
      if (!validOptions) {
        return;
      }
  
      // Check both kinds of statement: rules and at-rules
      root.walkRules(check);
      root.walkAtRules(check);
  
      function check(statement) {
        // Return early if blockless or has an empty block
        if (!hasBlock(statement) || hasEmptyBlock(statement)) {
          return;
        }
  
        // Allow an end-of-line comment
        const nodeToCheck = nextNonCommentNode(statement.first);
        if (!nodeToCheck) {
          return;
        }
  
        checker.afterOneOnly({
          source: rawNodeString(nodeToCheck),
          index: -1,
          lineCheckStr: blockString(statement),
          err: m => {
            report({
              message: m,
              node: statement,
              index:
                beforeBlockString(statement, { noRawBefore: true }).length + 1,
              result,
              ruleName
            });
          }
        });
      }
    };
  };
  
  rule.ruleName = ruleName;
  rule.messages = messages;
  module.exports = rule;
  