If the line break will not be reflected.

[nabezokodaikon]

If the line break will not be reflected.

OK

autocmd FileType
\ html,javascript,typescript,javascriptreact,typescriptreact
\ EmmetInstall

NG

autocmd FileType
\ html,
\ javascript,
\ typescript,
\ javascriptreact,
\ typescriptreact
\ EmmetInstall

I want to set up in line break, as I will be long.

[mattn]

This is not a bug of emmet-vim but probably you should join the tokens with backslash without space characters between commas.

[nabezokodaikon]

Understood. Thank you