Deprecation warning on `experiments.lazyBarrel` in Rspack 1.7+ in `@docusaurus/faster`

[tats-u]

Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Prerequisites

• I'm using the latest version of Docusaurus.
• I have tried the npm run clear or yarn clear command.
• I have tried rm -rf node_modules yarn.lock package-lock.json and re-installing packages.
• I have tried creating a repro with https://new.docusaurus.io.
• I have read the console error message carefully (if applicable).

Description

docusaurus/packages/docusaurus/src/webpack/base.ts

Lines 175 to 182 in df259dd

	if (process.env.DISABLE_RSPACK_LAZY_BARREL) {
	console.log('Rspack lazyBarrel disabled');
	experiments.lazyBarrel = false;
	} else {
	// TODO remove after we upgrade to Rspack 1.6+
	// Enabled by default for Rspack >= 1.6
	experiments.lazyBarrel = true;
	}

This property is deprecated by packages/rspack/src/config/normalization.ts in Rspack:

web-infra-dev/rspack@ff4d368#diff-78648f723799beccc94c4b2e506997d12d1ace8216aeb31c0731c37a6dce024a

			if (experiments.lazyBarrel) {
				util.deprecate(
					() => {},
					"`experiments.lazyBarrel` config has been deprecated and will be removed in Rspack v2.0. Lazy barrel is already stable and enabled by default. Please remove this option from your Rspack configuration."
				)();
			}

https://github.com/web-infra-dev/rspack/blob/ff4d368956a296062cbbc4e7411692de1e2caba2/packages/rspack/src/config/normalization.ts#L369-L374

and is going to be inaccessible by Rspack 2:

https://github.com/web-infra-dev/rspack/pull/12724/changes#diff-78648f723799beccc94c4b2e506997d12d1ace8216aeb31c0731c37a6dce024a

We had better remove it until Rspack 2 is released.

Reproducible demo

No response

Steps to reproduce

1. Enable @docusaurus/faster
2. docusaurus start or docusaurus build

Expected behavior

No deprecation warnings

Actual behavior

[Rspack Deprecation] `experiments.lazyBarrel` config is deprecated and will be removed in Rspack v2.0. Lazy barrel is already stable and enabled by default. Remove this option from your Rspack configuration.

Your environment

• Public source code:
• Public site URL:
• Docusaurus version used: 3.9.2
• Environment name and version (e.g. Chrome 89, Node.js 16.4): Node 24.13.0
• Operating system and version (e.g. Ubuntu 20.04.2 LTS): Windows 25H2

@rspack/core: 1.7.3

Affected on 1.7+: web-infra-dev/rspack@ff4d368

Self-service

• I'd be willing to fix this bug myself.