Support the LSP built into Typescript 7 (typescript-go)

ale_linters/typescript/tsc.vim

@@ -0,0 +1,10 @@
+call ale#Set('typescript_tsc_config_path', '')
+call ale#Set('typescript_tsc_use_global', get(g:, 'ale_use_global_executables', 0))
+
+call ale#linter#Define('typescript', {
+\   'name': 'tsc',
+\   'lsp': 'stdio',
+\   'executable': function('ale#handlers#typescript#GetExecutable'),
+\   'command': '%e --lsp --stdio',
+\   'project_root': function('ale#handlers#typescript#GetProjectRoot'),
+\})

autoload/ale/handlers/typescript.vim

@@ -0,0 +1,44 @@
+call ale#Set('typescript_tsc_executable', 'tsc')
+call ale#Set('typescript_lsp_project_root', '')
+
+function! ale#handlers#typescript#GetExecutable(buffer) abort
+    return ale#path#FindExecutable(a:buffer, 'typescript_tsc', [
+    \   'node_modules/typescript/bin/tsc',
+    \   '.yarn/sdks/typescript/bin/tsc',
+    \   'node_modules/.bin/tsc',
+    \])
+endfunction
+
+function! ale#handlers#typescript#GetProjectRoot(buffer) abort
+    let l:project_root = ale#Var(a:buffer, 'typescript_lsp_project_root')
+
+    if !empty(l:project_root)
+        return l:project_root
+    endif
+
+    let l:possible_project_roots = [
+    \   'tsconfig.json',
+    \   'package.json',
+    \   '.git',
+    \   bufname(a:buffer),
+    \]
+
+    for l:possible_root in l:possible_project_roots
+        let l:project_root = ale#path#FindNearestFile(a:buffer, l:possible_root)
+
+        if empty(l:project_root)
+            let l:project_root = ale#path#FindNearestDirectory(a:buffer, l:possible_root)
+        endif
+
+        if !empty(l:project_root)
+            " dir:p expands to /full/path/to/dir/ whereas
+            " file:p expands to /full/path/to/file (no trailing slash)
+            " Appending '/' ensures that :h:h removes the path's last segment
+            " regardless of whether it is a directory or not.
+            return fnamemodify(l:project_root . '/', ':p:h:h')
+        endif
+    endfor
+
+    return ''
+endfunction
+