feat: support WarnCaseSensitiveModulesPlugin

crates/rspack_binding_options/Cargo.toml

@@ -40,6 +40,7 @@ rspack_plugin_split_chunks              = { path = "../rspack_plugin_split_chunk
 rspack_plugin_split_chunks_new          = { path = "../rspack_plugin_split_chunks_new" }
 rspack_plugin_swc_css_minimizer         = { path = "../rspack_plugin_swc_css_minimizer" }
 rspack_plugin_swc_js_minimizer          = { path = "../rspack_plugin_swc_js_minimizer" }
+rspack_plugin_warn_sensitive_module     = { path = "../rspack_plugin_warn_sensitive_module" }
 rspack_plugin_wasm                      = { path = "../rspack_plugin_wasm" }
 rspack_plugin_web_worker_template       = { path = "../rspack_plugin_web_worker_template" }
 rspack_plugin_worker                    = { path = "../rspack_plugin_worker" }

crates/rspack_binding_options/src/options/mod.rs

@@ -178,6 +178,8 @@ impl RawOptionsApply for RawOptions {
 
     plugins.push(rspack_plugin_ensure_chunk_conditions::EnsureChunkConditionsPlugin.boxed());
 
+    plugins.push(rspack_plugin_warn_sensitive_module::WarnCaseSensitiveModulesPlugin.boxed());
+
     Ok(Self::Options {
       context,
       mode,

crates/rspack_core/src/compiler/compilation.rs

@@ -1186,6 +1186,9 @@ impl Compilation {
   pub async fn seal(&mut self, plugin_driver: SharedPluginDriver) -> Result<()> {
     let logger = self.get_logger("rspack.Compilation");
 
+    // https://github.com/webpack/webpack/blob/main/lib/Compilation.js#L2809
+    plugin_driver.seal(self)?;
+
     let start = logger.time("optimize dependencies");
     // https://github.com/webpack/webpack/blob/d15c73469fd71cf98734685225250148b68ddc79/lib/Compilation.js#L2812-L2814
     while plugin_driver.optimize_dependencies(self).await?.is_some() {}

crates/rspack_core/src/plugin/api.rs

@@ -447,6 +447,10 @@ pub trait Plugin: Debug + Send + Sync {
   async fn after_emit(&self, _compilation: &mut Compilation) -> Result<()> {
     Ok(())
   }
+
+  fn seal(&self, _compilation: &mut Compilation) -> Result<()> {
+    Ok(())
+  }
 }
 
 pub type BoxPlugin = Box<dyn Plugin>;

crates/rspack_core/src/plugin/plugin_driver.rs

@@ -631,4 +631,12 @@ impl PluginDriver {
     }
     Ok(())
   }
+
+  #[instrument(name = "plugin:seal", skip_all)]
+  pub fn seal(&self, compilation: &mut Compilation) -> Result<()> {
+    for plugin in &self.plugins {
+      plugin.seal(compilation)?;
+    }
+    Ok(())
+  }
 }

crates/rspack_plugin_warn_sensitive_module/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+edition    = "2021"
+license    = "MIT"
+name       = "rspack_plugin_warn_sensitive_module"
+repository = "https://github.com/web-infra-dev/rspack"
+version    = "0.1.0"
+
+[dependencies]
+dashmap      = { workspace = true }
+rspack_core  = { path = "../rspack_core" }
+rspack_error = { path = "../rspack_error" }

crates/rspack_plugin_warn_sensitive_module/src/lib.rs

@@ -0,0 +1,103 @@
+// https://github.com/webpack/webpack/blob/main/lib/WarnCaseSensitiveModulesPlugin.js
+
+use std::collections::HashMap;
+
+use rspack_core::{Compilation, Logger, Module, ModuleGraph, Plugin};
+use rspack_error::Diagnostic;
+
+#[derive(Debug, Default)]
+pub struct WarnCaseSensitiveModulesPlugin;
+
+impl WarnCaseSensitiveModulesPlugin {
+  pub fn new() -> Self {
+    Self
+  }
+
+  pub fn create_sensitive_modules_warning(
+    &self,
+    modules: &Vec<&dyn Module>,
+    graph: &ModuleGraph,
+  ) -> String {
+    let mut message =
+      String::from("There are multiple modules with names that only differ in casing.\n");
+
+    for m in modules {
+      if let Some(boxed_m) = graph.module_by_identifier(&m.identifier()) {
+        let mut module_msg = format!("  - {}\n", m.identifier());
+        graph
+          .get_incoming_connections(boxed_m)
+          .iter()
+          .for_each(|c| {
+            if let Some(original_identifier) = c.original_module_identifier {
+              module_msg.push_str(&format!("    - used by {}\n", original_identifier));
+            }
+          });
+
+        message.push_str(&module_msg);
+      }
+    }
+
+    message
+  }
+}
+
+// This Plugin warns when there are case sensitive modules in the compilation
+// which can cause unexpected behavior when deployed on a case-insensitive environment
+// it is executed in hook `compilation.seal`
+impl Plugin for WarnCaseSensitiveModulesPlugin {
+  fn name(&self) -> &'static str {
+    "rspack.WarnCaseSensitiveModulesPlugin"
+  }
+
+  fn seal(&self, compilation: &mut Compilation) -> rspack_error::Result<()> {
+    let logger = compilation.get_logger(self.name());
+    let start = logger.time("check case sensitive modules");
+    let mut diagnostics: Vec<Diagnostic> = vec![];
+    let modules = compilation
+      .module_graph
+      .modules()
+      .values()
+      .collect::<Vec<_>>();
+    let mut module_without_case_map: HashMap<String, HashMap<String, &Box<dyn Module>>> =
+      HashMap::new();
+
+    for module in modules {
+      // Ignore `data:` URLs, because it's not a real path
+      if let Some(normal_module) = module.as_normal_module() {
+        if normal_module
+          .resource_resolved_data()
+          .encoded_content
+          .is_some()
+        {
+          continue;
+        }
+      }
+
+      let identifier = module.identifier().to_string();
+      let lower_identifier = identifier.to_lowercase();
+      let lower_map = module_without_case_map.entry(lower_identifier).or_default();
+      lower_map.insert(identifier, module);
+    }
+
+    // sort by module identifier, guarantee the warning order
+    let mut case_map_vec = module_without_case_map.into_iter().collect::<Vec<_>>();
+    case_map_vec.sort_by(|a, b| a.0.cmp(&b.0));
+
+    for (_, lower_map) in case_map_vec {
+      if lower_map.values().len() > 1 {
+        let mut case_modules = lower_map.values().map(|m| m.as_ref()).collect::<Vec<_>>();
+        case_modules.sort_by_key(|m| m.identifier());
+        diagnostics.push(Diagnostic::warn(
+          "Sensitive Modules Warn".to_string(),
+          self.create_sensitive_modules_warning(&case_modules, &compilation.module_graph),
+          0,
+          0,
+        ));
+      }
+    }
+
+    compilation.push_batch_diagnostic(diagnostics);
+    logger.time_end(start);
+    Ok(())
+  }
+}

crates/rspack_testing/Cargo.toml

@@ -35,6 +35,7 @@ rspack_plugin_json                      = { path = "../rspack_plugin_json" }
 rspack_plugin_library                   = { path = "../rspack_plugin_library" }
 rspack_plugin_remove_empty_chunks       = { path = "../rspack_plugin_remove_empty_chunks" }
 rspack_plugin_runtime                   = { path = "../rspack_plugin_runtime" }
+rspack_plugin_warn_sensitive_module     = { path = "../rspack_plugin_warn_sensitive_module" }
 rspack_plugin_wasm                      = { path = "../rspack_plugin_wasm" }
 rspack_regex                            = { path = "../rspack_regex" }
 rspack_tracing                          = { path = "../rspack_tracing" }

crates/rspack_testing/src/test_config.rs

@@ -555,6 +555,8 @@ impl TestConfig {
     // Notice the plugin need to be placed after SplitChunksPlugin
     plugins.push(rspack_plugin_remove_empty_chunks::RemoveEmptyChunksPlugin.boxed());
 
+    plugins.push(rspack_plugin_warn_sensitive_module::WarnCaseSensitiveModulesPlugin.boxed());
+
     plugins.push(rspack_plugin_javascript::InferAsyncModulesPlugin {}.boxed());
     if self.experiments.async_web_assembly {
       plugins.push(rspack_plugin_wasm::FetchCompileAsyncWasmPlugin {}.boxed());

packages/rspack/tests/Stats.test.ts

@@ -185,6 +185,9 @@ describe("Stats", () => {
 		<t> process module group map: X ms
 		<t> ensure max size fit: X ms
 
+		LOG from rspack.WarnCaseSensitiveModulesPlugin
+		<t> check case sensitive modules: X ms
+
 		LOG from rspack.buildChunkGraph
 		<t> prepare entrypoints: X ms
 		<t> process queue: X ms

packages/rspack/tests/cases/warnings/case-sensitive/index.js

@@ -0,0 +1,9 @@
+it("should return different modules with different casing", done => {
+	var a = require("./a");
+	var A = require("./A");
+	var b = require("./b/file.js");
+	var B = require("./B/file.js");
+	expect(a).not.toBe(A);
+	expect(b).not.toBe(B);
+	done();
+});

packages/rspack/tests/cases/warnings/case-sensitive/warnings.js

@@ -0,0 +1,14 @@
+// expect 2 warnings
+// the sequence of warnings is not guaranteed
+module.exports = [
+	[
+		/There are multiple modules with names that only differ in casing/,
+		/case-sensitive.A\.js/,
+		/case-sensitive.a\.js/
+	],
+	[
+		/There are multiple modules with names that only differ in casing/,
+		/case-sensitive.B.file\.js/,
+		/case-sensitive.b.file\.js/
+	]
+];

webpack-test/cases/errors/case-sensitive/test.filter.js

@@ -6,5 +6,5 @@ module.exports = function(config) {
 	return fs.existsSync(path.join(__dirname, "TEST.FILTER.JS"));
 };
 */
-module.exports = () => {return "https://github.com/web-infra-dev/rspack/issues/4347"}
+module.exports = () => true