Question 1

How do I handle asynchronous loading in a JavaScript SDK?

Accepted Answer

The guide recommends using script elements with async attributes and implementing queue-based initialization to avoid blocking page render. It provides code examples for setting up event queues that execute once the SDK loads, ensuring reliable execution even with async scripts.

Question 2

What are the best storage options for a cross-browser SDK?

Accepted Answer

It covers cookies, localStorage, and sessionStorage with practical checks for writability and polyfills for compatibility. For instance, it includes functions to test if localStorage is available before use, helping avoid errors in restrictive environments.

Question 3

How can I debug a third-party JavaScript SDK effectively?

Accepted Answer

Suggests using browser developer tools, simulating multiple domains via hosts file edits, and employing debugging proxies like Charles. This allows inspection of HTTP requests, cookies, and headers to identify issues in SDK behavior.

Question 4

Vanilla JavaScript SDK vs using a framework like jQuery – which is better?

Accepted Answer

The guide argues for vanilla JS to minimize dependencies and improve performance, but acknowledges frameworks can simplify DOM manipulation in specific cases. It points to resources like 'You Might Not Need jQuery' for alternatives, though it strongly favors native implementations.

Question 5

What are common pitfalls in SDK versioning and how to avoid them?

Accepted Answer

Advises against timestamp-based versions and promotes Semantic Versioning (SemVer). It explains methods like using query strings or subdomains to distribute versions, ensuring clear tracking and easier updates for developers.

Question 6

How to ensure backward compatibility when updating an SDK?

Accepted Answer

Emphasizes designing APIs that support older versions and using changelogs to document changes. It recommends practices like not breaking existing interfaces and providing migration paths, as outlined in the 'Changelog Document' section.

javascript-sdk-design

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