docs(background.js): add param and returns to readLocationHeader JSDoc

[Copilot]

readLocationHeader had a prose-only JSDoc block, leaving IDE tooling without type hints and the function contract implicit.

Changes

• background.js: Added @param and @returns annotations to readLocationHeader, following the existing background.js convention (no dash between parameter name and description):

/**
 * Extracts the value of the HTTP `Location` response header from a header array.
 * Comparison is case-insensitive to match RFC 7230 requirements.
 *
 * @param {browser.webRequest.HttpHeader[]} [headers=[]] Array of response headers.
 * @returns {string} The Location header value, or "" if absent or malformed.
 */
const readLocationHeader = (headers = []) => { … };

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[PATCH] readLocationHeader() JSDoc is missing @param and @returns annotations</issue_title>
<issue_description>Category: documentation
Severity: patch
File(s): background.js

Description

readLocationHeader(headers) correctly extracts the HTTP Location response header, but its JSDoc block only contains a prose description. The @param and @returns tags are absent, which prevents IDE tooling from providing type hints and makes the contract less explicit for contributors.

Problematic code example

/**
 * Extracts the value of the HTTP `Location` response header from a header array.
 * Comparison is case-insensitive to match RFC 7230 requirements.
 */
const readLocationHeader = (headers = []) => { … };

Suggested fix

/**
 * Extracts the value of the HTTP `Location` response header from a header array.
 * Comparison is case-insensitive to match RFC 7230 requirements.
 *
 * @param {browser.webRequest.HttpHeader[]} [headers=[]] - Array of response headers.
 * @returns {string} The Location header value, or `""` if absent or malformed.
 */
const readLocationHeader = (headers = []) => { … };

Acceptance criteria

• @param tag is present with type and description
• @returns tag is present with type and description
• Documentation is consistent with other functions in the file</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [PATCH] readLocationHeader() JSDoc is missing param and returns annotations #170

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[Copilot]

Copilot wasn't able to review any files in this pull request.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.