Issue: TypeScript autocomplete for template literal types ignores user's Quote Style preference

🔎 Search Terms

List of keywords : "double", "quote", "preference", "style", "autcomplete", "template", "literral"

🕗 Version & Regression Information

TS Version : 6.0.3 or 7.0-rc

⏯ Playground Link

https://www.typescriptlang.org/play/?#code/C4TwDgpgBAKghgIwDYQHJwLbQLxQOTACMeUAPvsAEx4DcAUKJFAMID2SArhgHbpZS48ASwAmJcngBucThFoNw0eMghtOPAVAAGAEgDeylHwgBfAHT61XXplNb6jaAClWQ7pr10oUVtwBcUAAKcABOwEIyADwAShAAxqwhIpGGquzWADSwiChWPAB8+fQm9AncAM7AUMAQlQEubh5ePv5Qnt5QzSZ0JUA

💻 Code

type TableName = 't1' | 't2';
type ColumnName = 'id' | 'value';
type TableColumn = `${TableName}.${ColumnName}`;

type Join = {
  on: Partial<Record<TableColumn, TableColumn>>;
};

const test: Join = {
  on: {
    // Trigger autocomplete inside the object
  }
};

🙁 Actual behavior

The key is inserted using double quotes (e.g., "t1.id": ...), overriding the user's preference for single quotes.

🙂 Expected behavior

The key should be inserted using the quote style defined in the editor's preferences (e.g., single quotes if 'single' is selected).

Additional information about the issue

When using template literal types as keys in a Record or object mapping, the TypeScript language service's autocomplete functionality consistently forces double quotes (") when inserting the suggested keys, regardless of the user's configured javascript.preferences.quoteStyle or typescript.preferences.quoteStyle settings.

https://github.com/user-attachments/assets/e562b5ab-bbd7-48bd-96f8-a9181f03ba2e

This behavior is inconsistent with how standard string keys or property names are handled and complicates code consistency when working with complex template literal types in type-safe mappings.

Reproduce the template-literal Record example in the linked TypeScript Playground with the editor quote preference set to single quotes. Start by tracing the TypeScript language service autocomplete path for object keys, then verify that accepting a suggested key preserves the configured quote style for both JavaScript and TypeScript preferences.