function Handle()

in common/scripts/babel-conditional-preprocess.js [151:200]
33 lines of code
7 McCabe index (conditional complexity)

function Handle(path, featureSet, stabilizedFeatureSet, relaceWith = undefined) {
  let { node } = path;

  // If Node has no comments, it hence has no conditional compilation directives, skip this node.
  if (!node.leadingComments) {
    return;
  }

  // If Node has comments, but none are conditional-compile directives, skip this node.
  const firstConditionalCompileInstructionIdx = node.leadingComments.findIndex((comment) => nodeRemovalInstruction(node, comment, featureSet, stabilizedFeatureSet) !== 'none');
  if (firstConditionalCompileInstructionIdx === -1) {
    return;
  }

  // If Node has conditional-compile directives, but at least one of them is to keep the node, skip this node - but still remove the conditional compile line from the code.
  const shouldKeepNode = node.leadingComments.some((comment) => nodeRemovalInstruction(node, comment, featureSet, stabilizedFeatureSet) === 'keep');
  if (shouldKeepNode) {
    // Strip conditional compile comments only
    node.leadingComments.forEach((comment) => {
      if (nodeRemovalInstruction(node, comment, featureSet, stabilizedFeatureSet) !== 'none') {
        comment.ignore = true;
        comment.value = '';
      }
    });
    return;
  }

  // Node has conditional-compile directives. Remove the first comments starting at compile directive, and also remove all following comments so that
  // those comments aren't added to the AST node that follows the removed node.
  const firstRemovalInstructionIdx = node.leadingComments.findIndex((comment) => nodeRemovalInstruction(node, comment, featureSet, stabilizedFeatureSet) === 'remove');
  if (firstRemovalInstructionIdx === -1) {
    return;
  }
  node.leadingComments.slice(firstRemovalInstructionIdx).forEach((comment) => {
    comment.ignore = true;
    // Comment is inherited by next line even it is set to 'ignore'.
    // Clear the conditional compilation directive to avoid removing the
    // next line.
    comment.value = '';
  })

  // We cannot remove Expression in JSXExpressionContainer cause it is not correct for AST
  // Replacing it with jSXEmptyExpression will get us the same result
  // There will always be only one expression under JSXExpressionContainer
  if (path?.container?.type === 'JSXExpressionContainer') {
    path.replaceWith(t.jSXEmptyExpression());
  } else {
    path.remove();
  }
}