JavaScript IntelliSense does not suggest methods added to built-in prototypes

[sangafabrice]

Does this issue occur when all extensions are disabled?: Yes/No

• VS Code Version: 1.106.3
• OS Version: Windows 10 22H2

Steps to Reproduce:

1. Ensure javascript.suggest.enabled is set to true:

/** @file .vscode/settings.json */
{
    "javascript.suggest.enabled": true
}

2. Create a JavaScript file with the following content:

Promise.prototype.log = function() {
    this.then(console.log)
}

const promise = new Promise(r=>r(3));
promise.log();

3. Place the cursor after promise. (before log()) as shown below

4. Observe that the log method is not suggested by IntelliSense, even though it exists on the prototype of Promise.

[RyanCavanaugh]

Global merges like this aren't supported; you'll need to use a .d.ts file for this

[typescript-bot]

This issue has been marked as "Not a Defect" and has seen no recent activity. It has been automatically closed for house-keeping purposes.