Flow syntax highlighting doesn't work

[carljohnson93]

.vimrc:

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

---

Expected

above image taken via set syntax=typescript

---

Actual

---

• 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