Remove unused function addNewLineBeforeRootKeywords from src/lib.ts

- Remove `addNewLineBeforeRootKeywords` from `src/lib.ts` as it is not used in production code.
- Remove corresponding unit tests and import in `src/test/suite/lib.test.ts`.
- This improves code health by reducing dead code and maintenance burden.

Co-authored-by: pascalre <23454966+pascalre@users.noreply.github.com>

Author: google-labs-jules[bot]

src/lib.ts

@@ -28,11 +28,3 @@ export function removeLeadingLineBreakOfFirstElement(delimiters: RegExpMatchArra
   return delimiters
 }
 
-/**
- * Add a new line before each occurence of a top level keyword after a new line
- * @param   {string} text Text to be processed
- * @returns {string} processed text
- */
-export function addNewLineBeforeRootKeywords(text: string): string {
-  return text.replace(/\n[^\s]*:/g, "\n$&")
-}

src/test/suite/lib.test.ts

@@ -1,7 +1,6 @@
 import { equal, throws} from "assert"
 
 import {
-  addNewLineBeforeRootKeywords,
   prependWhitespacesOnEachLine
 } from "../../lib"
 import { removeTrailingCharacters } from "../../util/yaml-util"
@@ -52,17 +51,3 @@ suite("Test prependWhitespacesOnEachLine", () => {
   })
 })
 
-suite("Test addNewLineBeforeRootKeywords", () => {
-  test("should add an empty line before each top level keyword, but only if they appear after a new line", () => {
-    const actual = `data:
-  key: value
-spec: value
-`
-    const expected = `data:
-  key: value
-
-spec: value
-`
-    equal(addNewLineBeforeRootKeywords(actual), expected)
-  })
-})