wrong answer when detect javascript code

[AielloChan]

function a()
{
  alert(1);
}

this code will output result below:

[
  {
    "languageId": "css",
    "confidence": 0.0468878448009491
  },
  {
    "languageId": "js",
    "confidence": 0.03991376981139183
  },
  {
    "languageId": "rs",
    "confidence": 0.03963826224207878
  },
  {
    "languageId": "kt",
    "confidence": 0.03327805548906326
  },
  {
    "languageId": "ts",
    "confidence": 0.03319825232028961
  },
  {
    "languageId": "sh",
    "confidence": 0.029861992225050926
  },
  {
    "languageId": "sql",
    "confidence": 0.029533034190535545
  },
  {
    "languageId": "json",
    "confidence": 0.029188740998506546
  },
  {
    "languageId": "r",
    "confidence": 0.029107099398970604
  },
  {
    "languageId": "html",
    "confidence": 0.028572117909789085
  },
  {
    "languageId": "lua",
    "confidence": 0.028052087873220444
  },
  {
    "languageId": "php",
    "confidence": 0.025575537234544754
  },
  {
    "languageId": "matlab",
    "confidence": 0.02539527229964733
  },
  {
    "languageId": "ps1",
    "confidence": 0.024386828765273094
  },
  {
    "languageId": "dart",
    "confidence": 0.02368435449898243
  },
  {
    "languageId": "java",
    "confidence": 0.021611612290143967
  },
  {
    "languageId": "md",
    "confidence": 0.021575862541794777
  },
  {
    "languageId": "bat",
    "confidence": 0.021364782005548477
  },
  {
    "languageId": "go",
    "confidence": 0.020481547340750694
  },
  {
    "languageId": "groovy",
    "confidence": 0.019984547048807144
  },
  {
    "languageId": "csv",
    "confidence": 0.019320493564009666
  },
  {
    "languageId": "ini",
    "confidence": 0.01881265826523304
  },
  {
    "languageId": "cpp",
    "confidence": 0.017248883843421936
  },
  {
    "languageId": "asm",
    "confidence": 0.01704491674900055
  },
  {
    "languageId": "erl",
    "confidence": 0.016622837632894516
  },
  {
    "languageId": "c",
    "confidence": 0.016600018367171288
  },
  {
    "languageId": "prolog",
    "confidence": 0.016166100278496742
  },
  {
    "languageId": "tex",
    "confidence": 0.016103075817227364
  },
  {
    "languageId": "swift",
    "confidence": 0.015741979703307152
  },
  {
    "languageId": "pm",
    "confidence": 0.015570825897157192
  },
  {
    "languageId": "hs",
    "confidence": 0.014081381261348724
  },
  {
    "languageId": "scala",
    "confidence": 0.01391290407627821
  },
  {
    "languageId": "cs",
    "confidence": 0.013849792070686817
  },
  {
    "languageId": "ml",
    "confidence": 0.013665403239428997
  },
  {
    "languageId": "cmake",
    "confidence": 0.01339341513812542
  },
  {
    "languageId": "jl",
    "confidence": 0.013142472133040428
  },
  {
    "languageId": "ex",
    "confidence": 0.012597658671438694
  },
  {
    "languageId": "mm",
    "confidence": 0.01255908515304327
  },
  {
    "languageId": "rb",
    "confidence": 0.012347682379186153
  },
  {
    "languageId": "yaml",
    "confidence": 0.012162905186414719
  },
  {
    "languageId": "vba",
    "confidence": 0.01155632734298706
  },
  {
    "languageId": "lisp",
    "confidence": 0.011242426931858063
  },
  {
    "languageId": "coffee",
    "confidence": 0.010833844542503357
  },
  {
    "languageId": "f90",
    "confidence": 0.010609989985823631
  },
  {
    "languageId": "xml",
    "confidence": 0.01016379427164793
  },
  {
    "languageId": "pas",
    "confidence": 0.0101215410977602
  },
  {
    "languageId": "v",
    "confidence": 0.009585781954228878
  },
  {
    "languageId": "py",
    "confidence": 0.009499380365014076
  },
  {
    "languageId": "dockerfile",
    "confidence": 0.009462661109864712
  },
  {
    "languageId": "clj",
    "confidence": 0.007385620381683111
  },
  {
    "languageId": "makefile",
    "confidence": 0.007179617881774902
  },
  {
    "languageId": "toml",
    "confidence": 0.007158831227570772
  },
  {
    "languageId": "dm",
    "confidence": 0.006540646310895681
  },
  {
    "languageId": "cbl",
    "confidence": 0.006423421669751406
  }
]

but this can't be a css code right?