Function getNodeComments

compiler/companion/src/TSUtils.ts:140–170

(node: ts.Node)

}

export function getNodeComments(node: ts.Node): NodeComments | undefined {
  const leadingTriviaWidth = node.getLeadingTriviaWidth();
  if (leadingTriviaWidth === 0) {
    return undefined;
  }
  const nodeStart = node.getFullStart();
  const sourceFileText = node.getSourceFile().text;

  const leadingTriva = sourceFileText.substring(nodeStart, nodeStart + leadingTriviaWidth);
  const trimmedLeft = leadingTriva.trimStart();

  const trimLeftShrunkSize = leadingTriva.length - trimmedLeft.length;

  let resolvedStart = nodeStart + trimLeftShrunkSize;
  let resolvedWidth = leadingTriviaWidth - trimLeftShrunkSize;

  const trimmedRight = trimmedLeft.trimEnd();

  const trimRightShrunkSize = trimmedLeft.length - trimmedRight.length;
  resolvedWidth -= trimRightShrunkSize;

  if (!trimmedRight) {
    return undefined;
  }

  return {
    text: trimmedRight,
    start: resolvedStart,
    end: resolvedStart + resolvedWidth,
  };
}

export interface NodeToDump {
  node: ts.Node;