[typescript/rna-transcription] Update mentoring.md (#2324)

* Update mentoring.md

added another way of types

* Update mentoring.md

* Update mentoring.md

Author: RomaLetodiani

tracks/typescript/exercises/rna-transcription/mentoring.md

@@ -56,3 +56,8 @@ sequence.replace(/[CGAT]g/, (nucleotide) => /* */)
 
 - Encourage streams because it's harder to use intermediary variables (which can lead to bugs) and forces "one-by-one" approach. It is easier to explain the [`Object`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object) solution over multiple conditionals when it's a stream.
 - If a student uses an `Object`, point them to `falsy` values.
+- Highlight TypeScript's ability to infer types automatically, reducing the need for explicit type declarations in many cases.
+- For example, TypeScript can infer the types of objects like TRANSCRIPTION without the need for explicit type declarations, making code more concise and readable.
+- However, in more complex applications where types like DnaNucleotide and RnaNucleotide are externally provisioned, explicitly defining types using constructs like Record<X, Y> might be more appropriate.
+- Additionally, if those types exist, one may also expect all the transitions/transcriptions to exist as types.
+- This balance between conciseness and explicitness is crucial for maintaining clarity and robustness in the codebase.