cannot set syntax region on typescript tagged templates assigned to variables

[andykais]

• nvim --version:

NVIM v0.4.3
Build type: Release
LuaJIT 2.0.5
Compilation: /usr/bin/cc -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -O2 -DNDEBUG -DMIN_LOG_LEVEL=3 -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion -Wmissing-prototypes -Wimplicit-fallthrough -Wvla -fstack-protector-strong -fdiagnostics-color=always -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -I/build/neovim/src/build/config -I/build/neovim/src/neovim-0.4.3/src -I/usr/include -I/build/neovim/src/build/src/nvim/auto -I/build/neovim/src/build/include

• vim -u DEFAULTS (version: ) behaves differently? no
• Operating system/version: arch linux
• Terminal name/version: urxvt v9.22
• $TERM: rxvt-unicode-256color

Steps to reproduce using nvim -u NORC

add the following snippet to ~/.config/nvim/after/syntax/typescript.vim

unlet b:current_syntax
syn include @SQL syntax/sql.vim
syn region sqlTemplate start=+sql`+
        \ end=+`+
        \ contains=@SQL

create a file called test.ts like this:

// highlights template as SQL
sql`SELECT * FROM x`

// does not highlight template as SQL
const x = sql`SELECT * FROM x

nvim -u NORC test.ts

Actual behaviour

Expected behaviour

both the string templates should be highlighted as sql.

This is only an issue with typescript, javascript behaves as expected. Prior issues:

• cannot use with typescript cdata/vim-tagged-template#4
• Does not work with yajs.vim and vim-jsx Quramy/vim-js-pretty-template#15

[andykais]

is there any way to get help on this issue? Is there a way to increase visibility? I feel like this has gotten buried...