How to display line numbers in code block?

[kongjun18]

How to display line numbers in code block?

[Lruihao]

How to display line numbers in code block?

[markup]
  # Syntax Highlighting (https://gohugo.io/content-management/syntax-highlighting)
  [markup.highlight]
    ########## necessary configurations ##########
    # https://github.com/hugo-fixit/FixIt/issues/43
    codeFences = true
    lineNos = true
    lineNumbersInTable = true
    noClasses = false
    ########## necessary configurations ##########
    guessSyntax = true

or

[markup]
  [markup.highlight]
    _merge = 'shallow'