feat: add deno lsp for javascript (#3924)

* feat(js/deno): add deno lsp

* fix(doc/typescript): typo

* feat(doc/javascript): add deno lsp information

* feat(doc/supported-tools): add deno to js list, sorted

* fix(doc/javascript): update ToC and supported tools w/ deno

5 files changed, 102 insertions, 0 deletions

diff --git a/test/linter/test_javascript_deno_lsp.vader b/test/linter/test_javascript_deno_lsp.vader
new file mode 100644
index 00000000..965ce600
--- /dev/null
+++ b/test/linter/test_javascript_deno_lsp.vader
@@ -0,0 +1,79 @@
+Before:
+  let g:ale_deno_importMap = 'import_map.json'
+  let g:ale_deno_unstable = 0
+  let g:ale_deno_executable = 'deno'
+  let g:ale_deno_lsp_project_root = ''
+
+  runtime autoload/ale/handlers/deno.vim
+  call ale#assert#SetUpLinterTest('javascript', 'deno')
+
+After:
+  call ale#assert#TearDownLinterTest()
+
+Execute(Should set deno lsp for JavaScript projects using stable Deno API):
+  AssertLSPOptions {
+  \   'enable': v:true,
+  \   'lint': v:true,
+  \   'unstable': v:false,
+  \   'importMap': ''
+  \}
+
+Execute(Should set deno lsp using unstable Deno API if enabled by user):
+  let g:ale_deno_unstable = 1
+
+  AssertLSPOptions {
+  \   'enable': v:true,
+  \   'lint': v:true,
+  \   'unstable': v:true,
+  \   'importMap': ''
+  \}
+
+Execute(Should set the default importMap filepath):
+  call ale#test#SetFilename('../test-files/javascript_deno/main.js')
+
+  AssertLSPOptions {
+  \   'enable': v:true,
+  \   'lint': v:true,
+  \   'unstable': v:false,
+  \   'importMap': ale#path#Simplify(g:dir . '/../test-files/javascript_deno/import_map.json')
+  \}
+
+Execute(Should set the importMap filepath from user defined importMap):
+  let g:ale_deno_importMap = 'custom_import_map.json'
+  call ale#test#SetFilename('../test-files/javascript_deno/main.js')
+
+  AssertLSPOptions {
+  \   'enable': v:true,
+  \   'lint': v:true,
+  \   'unstable': v:false,
+  \   'importMap': ale#path#Simplify(g:dir . '/../test-files/javascript_deno/custom_import_map.json')
+  \}
+
+Execute(Should set the importMap filepath from user defined importMap with unstable API):
+  let g:ale_deno_importMap = 'custom_import_map.json'
+  let g:ale_deno_unstable = 1
+  call ale#test#SetFilename('../test-files/javascript_deno/main.js')
+
+  AssertLSPOptions {
+  \   'enable': v:true,
+  \   'lint': v:true,
+  \   'unstable': v:true,
+  \   'importMap': ale#path#Simplify(g:dir . '/../test-files/javascript_deno/custom_import_map.json')
+  \}
+
+Execute(Should find project root containing tsconfig.json):
+  call ale#test#SetFilename('../test-files/javascript_deno/main.js')
+
+  AssertLSPLanguage 'javascript'
+  AssertLSPProject ale#path#Simplify(g:dir . '/../test-files/javascript_deno')
+
+Execute(Should use user-specified project root):
+  let g:ale_deno_lsp_project_root = '/'
+
+  call ale#test#SetFilename('../test-files/javascript_deno/main.js')
+
+  AssertLSPLanguage 'javascript'
+  AssertLSPProject '/'
+
+Execute(Check Deno LSP command):
+  AssertLinter 'deno', ale#Escape('deno') . ' lsp'
diff --git a/test/test-files/javascript_deno/custom_import_map.json b/test/test-files/javascript_deno/custom_import_map.json
new file mode 100644
index 00000000..9f5a19a1
--- /dev/null
+++ b/test/test-files/javascript_deno/custom_import_map.json
@@ -0,0 +1,3 @@
+{
+    "imports": {}
+}
diff --git a/test/test-files/javascript_deno/import_map.json b/test/test-files/javascript_deno/import_map.json
new file mode 100644
index 00000000..9f5a19a1
--- /dev/null
+++ b/test/test-files/javascript_deno/import_map.json
@@ -0,0 +1,3 @@
+{
+    "imports": {}
+}
diff --git a/test/test-files/javascript_deno/main.js b/test/test-files/javascript_deno/main.js
new file mode 100644
index 00000000..accefceb
--- /dev/null
+++ b/test/test-files/javascript_deno/main.js
@@ -0,0 +1 @@
+console.log("Hello World");
diff --git a/test/test-files/javascript_deno/tsconfig.json b/test/test-files/javascript_deno/tsconfig.json
new file mode 100644
index 00000000..152b034e
--- /dev/null
+++ b/test/test-files/javascript_deno/tsconfig.json
@@ -0,0 +1,16 @@
+{
+    "compilerOptions": {
+        "allowJs": true,
+        "esModuleInterop": true,
+        "experimentalDecorators": true,
+        "inlineSourceMap": true,
+        "isolatedModules": true,
+        "jsx": "react",
+        "lib": ["deno.window"],
+        "module": "esnext",
+        "strict": true,
+        "target": "esnext",
+        "useDefineForClassFields": true
+    },
+    "includes": ["main.js"]
+}