Function validateForLoop

src/transform/forEach/validateForLoop.js:14–37

(node, {body, indexKind, itemKind})

 * @return {Array} Array of node and warnings message or undefined on success.
 */
export default function validateForLoop(node, {body, indexKind, itemKind}) {
  let statement;
  if ((statement = returnUsed(body))) {
    return [statement, 'Return statement used in for-loop body'];
  }
  else if ((statement = breakWithLabelUsed(body))) {
    return [statement, 'Break statement with label used in for-loop body'];
  }
  else if ((statement = continueWithLabelUsed(body))) {
    return [statement, 'Continue statement with label used in for-loop body'];
  }
  else if ((statement = breakUsed(body))) {
    return [statement, 'Break statement used in for-loop body'];
  }
  else if ((statement = continueUsed(body))) {
    return [statement, 'Continue statement used in for-loop body'];
  }
  else if (indexKind !== 'let') {
    return [node, 'Only for-loops with indexes declared as let can be transformed (use let transform first)'];
  }
  else if (itemKind !== 'const') {
    return [node, 'Only for-loops with const array items can be transformed (use let transform first)'];
  }
}

const loopStatements = ['ForStatement', 'ForInStatement', 'ForOfStatement', 'DoWhileStatement', 'WhileStatement'];