Completion does not show `Boolean.prototype.toString()` on boolean type expression

[loucadufault]

🔎 Search Terms

boolean, toString, toString(), completion, autocomplete, suggestion, suggestions, intellisense, vscode, playground, bool

🕗 Version & Regression Information

• This is the behavior in every version I tried, and I reviewed the FAQ for entries about autocomplete

⏯ Playground Link

https://www.typescriptlang.org/play/?ts=5.6.3#code/MYewdgzgLgBARiEAbGBeGUBOBXApgKHwHoiYwQZdNMRN8FkA6KEAZSwEswBzACgEpCJDJgCeMAIbYWoALYAHJLihduMDlAA0MCAAsQAdwgwARADkKoACa5JwFeGMSAbhI5IJcJSfqIkzNix8IA

💻 Code

const bool = true

// no error
bool.toString()

// try autocompleting it
bool.toStr

🙁 Actual behavior

Shows "No code actions available"

🙂 Expected behavior

Shows the toString() method as a completion option (alongside Boolean.prototype.valueOf()).

Additional information about the issue

Occurs in VS Code and TS Playground website.

[loucadufault]

Perhaps this is just an issue with the ES types...

MDN lists this on the Boolean prototype: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean/toString

However, the LSP in VSCode points to Object.prototype.toString(). Indeed the toString() method is not found in the Boolean interface here.

I assume there is a special case in completion logic to omit base Object methods from completion (as it's noisy).

[RyanCavanaugh]

Duplicate #38347