Function trimTrailingBlank

scripts/prepare-release.mjs:155–159

* Trim trailing blank lines from an array of lines, then return. * Keeps the output tidy when merging.

(arr)

 * Keeps the output tidy when merging.
 */
function trimTrailingBlank(arr) {
  let i = arr.length;
  while (i > 0 && /^\s*$/.test(arr[i - 1])) i--;
  return arr.slice(0, i);
}

function main() {
  const versionArg = process.argv[2];