[Bug] Monaco bundles outdated vscode-json-languageservice causing Draft 2020-12 schema errors in browser

Reproducible in vscode.dev or in VS Code Desktop?

• Not reproducible in vscode.dev or VS Code Desktop

Reproducible in the monaco editor playground?

• Not reproducible in the monaco editor playground

Monaco Editor Playground Link

https://microsoft.github.io/monaco-editor/playground.html?source=v0.55.1#XQAAAALjAQAAAAAAAABBqQkHQ5NjdMjwa-jY7SIQ9S7DNlzs5W-mwj0fe1ZCDRFc9ws9XQE0SJE1jc2VKxhaLFIw9vEWSxW3yscw0J8tR_YWJK-4JiwXYApNXu3LIJYp_q_KnzpC7M7q5vQEXpC8rIYhdOupAfwlq6nKlWmk0jDLZk7jHmVjhXBqB1AXT0U82uqgzBtwhdXxojDasjV6Y-2UfNzfni9Lmw3fcEf3JaGFwVGah6B0Zl4HKF9cIhYFRs8D20X9MEeX25FwUsa1H4Sw-f9dpjVEdZYdJGGU37gd2_7-f2pDFZyM5qRsoU-mriWGXZcF06BxxFODX5SGJ32r5BoM0naBABi1UurpfpkvyYvRI9kjOd7BBLOjOIaYodvrm65OLi_xQIwYMNz9hc4vXtHCRf18RUZX21dAZ2urtTT9F5MY

Monaco Editor Playground Code

monaco.languages.json.jsonDefaults.setDiagnosticsOptions({
    validate: true,
    schemas: [{
        uri: "https://json-schema.org/draft/2020-12/schema",
        fileMatch: ["*"],
    }]
});

monaco.editor.create(document.getElementById("container"), {
    value: JSON.stringify({
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "type": "object"
    }, null, 2),
    language: "json"
});

Reproduction Steps

1. Open the Monaco Editor Playground.
2. Set the JSON diagnostics to use the Draft 2020-12 meta-schema URI.
3. Create a JSON file using that $schema.
4. Observe the validation markers.

Actual (Problematic) Behavior

Monaco 0.55.1 bundles vscode-json-languageservice@5.3.11.
When editing JSON schemas using Draft 2020-12, the editor:

• attempts to fetch the meta-schema in the browser, resulting in
  No schema request service available
• emits $dynamicRef warnings that were removed in newer language service versions

Expected Behavior

Monaco should bundle a version of vscode-json-languageservice that includes the Draft 2020-12 fixes (>= 5.6.3), as already shipped in VS Code, so that:

• the Draft 2020-12 meta-schema is bundled locally
• the $dynamicRef warning is removed
• no remote schema fetch is attempted in browser environments

Additional Context

This is caused by the version of vscode-json-languageservice currently bundled in Monaco (v0.55.1 uses v5.3.11).

The fixes for native Draft 2020-12 support (including the bundled flat schema and warning removal) were implemented in vscode-json-languageservice v5.6.3 (see PRs 294(https://github.com/microsoft/vscode-json-languageservice/pull/294) and 295( https://github.com/microsoft/vscode-json-languageservice/pull/295 ) in that repository).

This issue was identified during development for the JSON Schema Organization (see: json-schema-org/tour#103). Upgrading this dependency will significantly improve the experience for anyone using modern JSON Schema drafts in standalone Monaco environments.

Start with Monaco's dependency declaration for vscode-json-languageservice and reproduce the supplied Monaco Editor Playground example. Done means the bundled version is at least 5.6.3, Draft 2020-12 is handled locally, and the browser no longer reports a missing schema request service or the obsolete $dynamicRef warning.