Function addContextToFrame

packages/core/src/utils/misc.ts:169–191

(lines: string[], frame: StackFrame, linesOfContext: number = 5)

 * @param linesOfContext number of context lines we want to add pre/post
 */
export function addContextToFrame(lines: string[], frame: StackFrame, linesOfContext: number = 5): void {
  // When there is no line number in the frame, attaching context is nonsensical and will even break grouping
  if (frame.lineno === undefined) {
    return;
  }

  const maxLines = lines.length;
  const sourceLine = Math.max(Math.min(maxLines - 1, frame.lineno - 1), 0);

  frame.pre_context = lines
    .slice(Math.max(0, sourceLine - linesOfContext), sourceLine)
    .map((line: string) => snipLine(line, 0));

  // We guard here to ensure this is not larger than the existing number of lines
  const lineIndex = Math.min(maxLines - 1, sourceLine);

  // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
  frame.context_line = snipLine(lines[lineIndex]!, frame.colno || 0);

  frame.post_context = lines
    .slice(Math.min(sourceLine + 1, maxLines), sourceLine + 1 + linesOfContext)
    .map((line: string) => snipLine(line, 0));
}

/**
 * Checks whether or not we've already captured the given exception (note: not an identical exception - the very object