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no-translation-concatenation

Forbid string concatenation inside JupyterLab translation wrapper calls.

Why​

Translation extractors only pick up static string content in calls like trans.__("..."). Pure string-literal concatenation (for example, "a" + "b") is still static and allowed, but concatenation with a variable (for example, "Hello " + name) is dynamic and cannot be extracted, so it never gets translated. See Rules.

Rule details​

The rule reports any + binary expression passed as an argument to a translation method (__) called on a recognized translation bundle:

  • trans
  • this.trans
  • this._trans
  • this.props.trans
  • props.trans

Incorrect​

this.trans.__("Hello " + userName);

Correct​

this.trans.__("Hello %1", userName);

Options​

This rule has no options.