function applyHeadersMut()

in core.ts [1296:1310]

• 13 lines of code
• 6 McCabe index (conditional complexity)

function applyHeadersMut(targetHeaders: Headers, newHeaders: Headers): void {
  for (const k in newHeaders) {
    if (!hasOwn(newHeaders, k)) continue;
    const lowerKey = k.toLowerCase();
    if (!lowerKey) continue;

    const val = newHeaders[k];

    if (val === null) {
      delete targetHeaders[lowerKey];
    } else if (val !== undefined) {
      targetHeaders[lowerKey] = val;
    }
  }
}