feat(cli): rule profiler

.changeset/rare-queens-doubt.md

@@ -0,0 +1,5 @@
+---
+"@biomejs/biome": minor
+---
+
+Added the rule profiler behind the `--profile-rules` cli flag. You can now see a report of which lint rules took the longest to execute.

crates/biome_analyze/Cargo.toml

@@ -28,6 +28,9 @@ rustc-hash               = { workspace = true }
 schemars                 = { workspace = true, optional = true }
 serde                    = { workspace = true, features = ["derive"], optional = true }
 
+[dev-dependencies]
+insta = { workspace = true }
+
 [features]
 schema = ["biome_console/schema", "dep:schemars", "serde"]
 serde  = ["dep:biome_deserialize", "dep:biome_deserialize_macros", "dep:serde"]

crates/biome_analyze/src/analyzer_plugin.rs

@@ -6,7 +6,9 @@ use std::{fmt::Debug, sync::Arc};
 use biome_rowan::{AnySyntaxNode, Language, RawSyntaxKind, SyntaxKind, SyntaxNode, WalkEvent};
 
 use crate::matcher::SignalRuleKey;
-use crate::{DiagnosticSignal, RuleCategory, RuleDiagnostic, SignalEntry, Visitor, VisitorContext};
+use crate::{
+    DiagnosticSignal, RuleCategory, RuleDiagnostic, SignalEntry, Visitor, VisitorContext, profiling,
+};
 
 /// Slice of analyzer plugins that can be cheaply cloned.
 pub type AnalyzerPluginSlice<'a> = &'a [Arc<Box<dyn AnalyzerPlugin>>];
@@ -100,24 +102,26 @@ where
             return;
         }
 
-        let signals = self
+        let rule_timer = profiling::start_plugin_rule("plugin");
+        let diagnostics = self
             .plugin
-            .evaluate(node.clone().into(), ctx.options.file_path.clone())
-            .into_iter()
-            .map(|diagnostic| {
-                let name = diagnostic
-                    .subcategory
-                    .clone()
-                    .unwrap_or_else(|| "anonymous".into());
-
-                SignalEntry {
-                    text_range: diagnostic.span().unwrap_or_default(),
-                    signal: Box::new(DiagnosticSignal::new(move || diagnostic.clone())),
-                    rule: SignalRuleKey::Plugin(name.into()),
-                    category: RuleCategory::Lint,
-                    instances: Default::default(),
-                }
-            });
+            .evaluate(node.clone().into(), ctx.options.file_path.clone());
+        rule_timer.stop();
+
+        let signals = diagnostics.into_iter().map(|diagnostic| {
+            let name = diagnostic
+                .subcategory
+                .clone()
+                .unwrap_or_else(|| "anonymous".into());
+
+            SignalEntry {
+                text_range: diagnostic.span().unwrap_or_default(),
+                signal: Box::new(DiagnosticSignal::new(move || diagnostic.clone())),
+                rule: SignalRuleKey::Plugin(name.into()),
+                category: RuleCategory::Lint,
+                instances: Default::default(),
+            }
+        });
 
         ctx.signal_queue.extend(signals);
     }

crates/biome_analyze/src/lib.rs

@@ -13,6 +13,7 @@ pub mod context;
 mod diagnostics;
 mod matcher;
 pub mod options;
+pub mod profiling;
 mod query;
 mod registry;
 mod rule;