13 files changed, 76 insertions, 1 deletions
diff --git a/CHANGELOG.md b/CHANGELOG.md
index cb03f72..3297592 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,12 @@
 All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog].
 
+## Unreleased
+### Formatters
+* `biome` ([#339]).
+
+[#339]: https://github.com/radian-software/apheleia/pull/339
+
 ## 4.3 (released 2024-11-12)
 ### Features
 * New user option `apheleia-skip-functions`, like
diff --git a/apheleia-formatters.el b/apheleia-formatters.el
index bef7aa0..ba3aad1 100644
--- a/apheleia-formatters.el
+++ b/apheleia-formatters.el
@@ -35,6 +35,7 @@
               "-"))
     (brittany . ("brittany"))
     (buildifier . ("buildifier"))
+    (biome . ("apheleia-npx" "biome" "format" "--stdin-file-path" filepath))
     (caddyfmt . ("caddy" "fmt" "-"))
     (clang-format . ("clang-format"
                      "-assume-filename"
@@ -1177,7 +1178,7 @@ For more implementation detail, see
     (setq-local indent-line-function
                 (buffer-local-value 'indent-line-function buffer))
     (setq-local lisp-indent-function
-		(buffer-local-value 'lisp-indent-function buffer))
+                (buffer-local-value 'lisp-indent-function buffer))
     (setq-local indent-tabs-mode
                 (buffer-local-value 'indent-tabs-mode buffer))
     (goto-char (point-min))
diff --git a/test/formatters/installers/biome.bash b/test/formatters/installers/biome.bash
new file mode 100644
index 0000000..56b6e1b
--- /dev/null
+++ b/test/formatters/installers/biome.bash
@@ -0,0 +1 @@
+npm install -g @biomejs/biome
diff --git a/test/formatters/samplecode/biome/in.css b/test/formatters/samplecode/biome/in.css
new file mode 100644
index 0000000..55d5d36
--- /dev/null
+++ b/test/formatters/samplecode/biome/in.css
@@ -0,0 +1,13 @@
+   body
+
+{
+  padding-left  : 11em;
+font-family
+  :    Georgia,
+
+             "Times New Roman",
+        Times, serif;
+       color: purple;
+  background-color:
+      #d8da3d
+   }
diff --git a/test/formatters/samplecode/biome/in.graphql b/test/formatters/samplecode/biome/in.graphql
new file mode 100644
index 0000000..72fc73e
--- /dev/null
+++ b/test/formatters/samplecode/biome/in.graphql
@@ -0,0 +1 @@
+{human(id: "1000") {name height(unit: FOOT)}}
diff --git a/test/formatters/samplecode/biome/in.js b/test/formatters/samplecode/biome/in.js
new file mode 100644
index 0000000..fd56713
--- /dev/null
+++ b/test/formatters/samplecode/biome/in.js
@@ -0,0 +1,4 @@
+function HelloWorld({greeting = "hello", greeted = '"World"', silent = false, onMouseOver,}) {
+
+  if(!greeting){return null};
+  }
diff --git a/test/formatters/samplecode/biome/in.json b/test/formatters/samplecode/biome/in.json
new file mode 100644
index 0000000..28dc75f
--- /dev/null
+++ b/test/formatters/samplecode/biome/in.json
@@ -0,0 +1 @@
+{"arrowParens":"always","bracketSpacing":true,"embeddedLanguageFormatting":"auto","htmlWhitespaceSensitivity":"css","insertPragma":false,"jsxBracketSameLine":false,"jsxSingleQuote":false,"printWidth":80,"proseWrap":"preserve","quoteProps":"as-needed","requirePragma":false,"semi":true,"singleQuote":false,"tabWidth":2,"trailingComma":"es5","useTabs":false,"vueIndentScriptAndStyle":false}
diff --git a/test/formatters/samplecode/biome/in.ts b/test/formatters/samplecode/biome/in.ts
new file mode 100644
index 0000000..c75d40f
--- /dev/null
+++ b/test/formatters/samplecode/biome/in.ts
@@ -0,0 +1 @@
+interface GreetingSettings{greeting: string; duration?: number; color?: string;}declare function greet(setting: GreetingSettings): void;
diff --git a/test/formatters/samplecode/biome/out.css b/test/formatters/samplecode/biome/out.css
new file mode 100644
index 0000000..87717b9
--- /dev/null
+++ b/test/formatters/samplecode/biome/out.css
@@ -0,0 +1,6 @@
+body {
+	padding-left: 11em;
+	font-family: Georgia, "Times New Roman", Times, serif;
+	color: purple;
+	background-color: #d8da3d;
+}
diff --git a/test/formatters/samplecode/biome/out.graphql b/test/formatters/samplecode/biome/out.graphql
new file mode 100644
index 0000000..89828da
--- /dev/null
+++ b/test/formatters/samplecode/biome/out.graphql
@@ -0,0 +1,6 @@
+{
+	human(id: "1000") {
+		name
+		height(unit: FOOT)
+	}
+}
diff --git a/test/formatters/samplecode/biome/out.js b/test/formatters/samplecode/biome/out.js
new file mode 100644
index 0000000..1486b51
--- /dev/null
+++ b/test/formatters/samplecode/biome/out.js
@@ -0,0 +1,10 @@
+function HelloWorld({
+	greeting = "hello",
+	greeted = '"World"',
+	silent = false,
+	onMouseOver,
+}) {
+	if (!greeting) {
+		return null;
+	}
+}
diff --git a/test/formatters/samplecode/biome/out.json b/test/formatters/samplecode/biome/out.json
new file mode 100644
index 0000000..86787f9
--- /dev/null
+++ b/test/formatters/samplecode/biome/out.json
@@ -0,0 +1,19 @@
+{
+	"arrowParens": "always",
+	"bracketSpacing": true,
+	"embeddedLanguageFormatting": "auto",
+	"htmlWhitespaceSensitivity": "css",
+	"insertPragma": false,
+	"jsxBracketSameLine": false,
+	"jsxSingleQuote": false,
+	"printWidth": 80,
+	"proseWrap": "preserve",
+	"quoteProps": "as-needed",
+	"requirePragma": false,
+	"semi": true,
+	"singleQuote": false,
+	"tabWidth": 2,
+	"trailingComma": "es5",
+	"useTabs": false,
+	"vueIndentScriptAndStyle": false
+}
diff --git a/test/formatters/samplecode/biome/out.ts b/test/formatters/samplecode/biome/out.ts
new file mode 100644
index 0000000..b97c21b
--- /dev/null
+++ b/test/formatters/samplecode/biome/out.ts
@@ -0,0 +1,6 @@
+interface GreetingSettings {
+	greeting: string;
+	duration?: number;
+	color?: string;
+}
+declare function greet(setting: GreetingSettings): void;