Flow syntax highlighting doesn't work

[carljohnson93]

.vimrc:

"...
Plug 'pangloss/vim-javascript'
"...
let g:javascript_plugin_flow=1

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Expected above image taken via set syntax=typescript

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Actual

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• VIm version - 8.1

• OS - Ubuntu 20.04

• Complete list of all installed plugins:

  Plug 'morhetz/gruvbox'
  Plug 'maxmellon/vim-jsx-pretty'
  Plug 'pangloss/vim-javascript'
  Plug 'preservim/nerdtree'
  Plug 'tpope/vim-fugitive'
  Plug 'airblade/vim-gitgutter'
  Plug 'dense-analysis/ale'
  Plug 'neoclide/coc.nvim', {'branch': 'release'}
  Plug 'easymotion/vim-easymotion'
  Plug 'preservim/nerdcommenter'
  Plug 'prettier/vim-prettier', { 'do': 'yarn install' }
  Plug 'tpope/vim-surround'
  Plug 'justinmk/vim-sneak'
  Plug 'sheerun/vim-polyglot'
  Plug 'vim-airline/vim-airline'
  Plug 'vim-airline/vim-airline-themes'
  Plug 'junegunn/fzf', { 'do': { -> fzf#install() } }
  Plug 'junegunn/fzf.vim'
  Plug 'majutsushi/tagbar'
  Plug 'altercation/vim-colors-solarized'
  Plug 'joshdick/onedark.vim'
  Plug 'ervandew/supertab'
  Plug 'mattn/emmet-vim'
  Plug 'tpope/vim-eunuch'
  Plug 'editorconfig/editorconfig-vim'
  Plug 'tmhedberg/matchit'
  Plug 'junegunn/goyo.vim'
  Plug 'elzr/vim-json'
  Plug 'junegunn/seoul256.vim'
  Plug 'sjl/badwolf'
  Plug 'iloginow/vim-stylus'
  Plug 'tpope/vim-repeat'
  Plug 'tpope/vim-unimpaired'
  Plug 'nanotech/jellybeans.vim'
  Plug 'w0ng/vim-hybrid'
  Plug 'junegunn/vim-easy-align'
  Plug 'mileszs/ack.vim'
  Plug 'mhartington/oceanic-next'
  Plug 'drewtempelmeyer/palenight.vim'
  Plug 'ayu-theme/ayu-vim'

• settings relative to syntax highlighting:

  let g:polyglot_disabled = ['stylus', 'javascript', 'jsx']
  " ...
  let g:javascript_plugin_jsdoc=1
  let g:javascript_plugin_flow=1