Deprecation: #108963 - Deprecate PageRenderer->addInlineLanguageDomain() 

See forge#108963

Description 

\TYPO3\CMS\Core\Page\PageRenderer->addInlineLanguageDomain() has been deprecated in favor of importing JavaScript modules, as introduced in Feature: #108941 - Provide language labels as virtual JavaScript modules.

Impact 

Extension developers can now use labels in JavaScript components without requiring labels to be preloaded globally or per module. This reduces the risk of missing labels and simplifies developer workflows.

Affected installations 

The deprecated method was introduced in TYPO3 v14.1. This means that only installations that use addInlineLanguageDomain() in TYPO3 v14.1 or later are affected.

Migration 

The call to PageRenderer::addInlineLanguageDomain() can be removed. In the JavaScript code, add a module import that imports from the '~labels/' prefix.

Before:

$pageRenderer->addInlineLanguageDomain('core.bookmarks');
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import { html } from 'lit';
import { lll } from '@typo3/core/lit-helper.js';

html`<p>{lll('core.bookmarks:groupType.global')}</p>`
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After:

import { html } from 'lit';
// Import labels from language domain "core.bookmarks"
import labels from '~labels/core.bookmarks';

// Use label
html`<p>{labels.get('groupType.global')}</p>`
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