Question 1

How to load a JavaScript SDK without blocking the page?

Accepted Answer

Use asynchronous script inclusion by creating a script element with async=true and inserting it into the DOM. The guide provides code snippets for this, including handling initialization queues to avoid undefined function calls.

Question 2

What are the best storage options for a JavaScript SDK?

Accepted Answer

The guide covers cookies, localStorage, and sessionStorage, with writability checks and code examples. It advises using localStorage for persistent data but notes limitations like separation between HTTP and HTTPS contexts.

Question 3

How to debug a JavaScript SDK across multiple domains?

Accepted Answer

Simulate multiple domains by editing the hosts file to point to localhost, and use tools like BrowserSync or debugging proxies. The guide explains setting up publisher.net and sdk.net for testing cross-origin interactions.

Question 4

Vanilla JavaScript or TypeScript for SDK development?

Accepted Answer

This guide strongly recommends vanilla JavaScript for better compatibility and performance, but TypeScript offers type safety and modern tooling. The choice depends on team preferences, with the guide's stance being a trade-off for broader browser support.

Question 5

What are common cross-origin communication techniques for SDKs?

Accepted Answer

Techniques include iframes, postMessage, JSONP, and image beacons. The guide details each with examples, such as using postMessage for secure messaging and JSONP for simple GET requests with callbacks.

Question 6

How to handle SDK versioning and backward compatibility?

Accepted Answer

Use semantic versioning (SemVer) and maintain changelogs. The guide suggests distribution methods like query strings or subdomains, and stresses the importance of forward and backward compatibility to avoid breaking changes.

Question 7

How to check if cookies are writable in a third-party context?

Accepted Answer

The guide notes it's impossible with client-side JavaScript alone and requires server assistance. It provides snippets for checking cookie writability in same-origin scenarios but admits limitations for third-party cookies.

JavaScript SDK Design Guide

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