♻️ move pure utilities to @datadog/js-core/util

[BenoitZugmeyer]

Motivation

The @datadog/js-core package is meant to hold runtime-agnostic SDK utilities shared across all Datadog JS SDKs. Several pure utilities (byteUtils, Context types, mockable, jsonStringify) lived exclusively in @datadog/browser-core, making them unavailable to non-browser consumers such as the Worker or future server-side SDK targets. This PR moves them to @datadog/js-core so they can be shared.

Changes

• byteUtils (computeBytesCount, concatBuffers, ONE_KIBI_BYTE, ONE_MEBI_BYTE, Uint8ArrayBuffer) moved to @datadog/js-core/util; spec moved alongside.
• Context types (Context, ContextValue, ContextArray) moved to @datadog/js-core/util.
• mockable (mockable, mockableReplacements) moved to @datadog/js-core/util.
• jsonStringify (jsonStringify, detachToJsonMethod, ObjectWithToJsonMethod) moved to @datadog/js-core/util; spec moved alongside. The noop dependency is inlined to avoid pulling browser-specific utilities into js-core.
• Uint8ArrayBuffer simplified from a custom interface to Uint8Array<ArrayBuffer>.
• All consumers (browser-core internals, browser-logs, browser-rum, browser-rum-core, browser-rum-slim, browser-worker, browser-debugger, developer-extension, e2e tests) now import directly from @datadog/js-core/util instead of going through browser-core re-exports.
• @datadog/js-core added as a dependency of @datadog/browser-worker.

Test instructions

This is a pure refactor with no observable behaviour change. All existing unit tests cover the moved code. To sanity-check the SDK still initialises and sends data correctly:

1. Run yarn dev and open http://localhost:8080.
2. Check the Network tab — RUM and Logs requests should still be sent to the intake endpoints on the configured interval.
3. Navigate away from the page and confirm a flush request is sent on beforeunload/visibilitychange.

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.
• Updated documentation and/or relevant AGENTS.md file

[datadog-datadog-prod-us1-2]

 

⚠️ Warnings

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ℹ️ Info

No other issues found (see more)

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 77.13% (+0.00%)

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[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	181.56 KiB	181.56 KiB	-3 B	-0.00%	✅
Rum Profiler	8.43 KiB	8.43 KiB	0 B	0.00%	✅
Rum Recorder	22.31 KiB	22.31 KiB	0 B	0.00%	✅
Logs	57.67 KiB	57.68 KiB	+16 B	+0.03%	✅
Rum Salesforce	N/A	139.65 KiB	N/A	N/A	N/A
Rum Slim	139.63 KiB	139.65 KiB	+15 B	+0.01%	✅
Worker	22.96 KiB	22.96 KiB	0 B	0.00%	✅
Rum Shopify	N/A	202.38 KiB	N/A	N/A	N/A
Rum-shopify Profiler	N/A	8.43 KiB	N/A	N/A	N/A
Rum-shopify Recorder	N/A	3.72 KiB	N/A	N/A	N/A