1 files changed, 9 insertions, 20 deletions

diff --git a/cli/tools/coverage/mod.rs b/cli/tools/coverage/mod.rs
index 6177295a6..1c14859ea 100644
--- a/cli/tools/coverage/mod.rs
+++ b/cli/tools/coverage/mod.rs
@@ -43,34 +43,22 @@ impl CoverageCollector {
   }
 
   async fn enable_debugger(&mut self) -> Result<(), AnyError> {
-    self
-      .session
-      .post_message::<()>("Debugger.enable", None)
-      .await?;
+    self.session.post_message("Debugger.enable", None).await?;
     Ok(())
   }
 
   async fn enable_profiler(&mut self) -> Result<(), AnyError> {
-    self
-      .session
-      .post_message::<()>("Profiler.enable", None)
-      .await?;
+    self.session.post_message("Profiler.enable", None).await?;
     Ok(())
   }
 
   async fn disable_debugger(&mut self) -> Result<(), AnyError> {
-    self
-      .session
-      .post_message::<()>("Debugger.disable", None)
-      .await?;
+    self.session.post_message("Debugger.disable", None).await?;
     Ok(())
   }
 
   async fn disable_profiler(&mut self) -> Result<(), AnyError> {
-    self
-      .session
-      .post_message::<()>("Profiler.disable", None)
-      .await?;
+    self.session.post_message("Profiler.disable", None).await?;
     Ok(())
   }
 
@@ -78,9 +66,10 @@ impl CoverageCollector {
     &mut self,
     parameters: StartPreciseCoverageParameters,
   ) -> Result<StartPreciseCoverageReturnObject, AnyError> {
+    let parameters_value = serde_json::to_value(parameters)?;
     let return_value = self
       .session
-      .post_message("Profiler.startPreciseCoverage", Some(parameters))
+      .post_message("Profiler.startPreciseCoverage", Some(parameters_value))
       .await?;
 
     let return_object = serde_json::from_value(return_value)?;
@@ -93,7 +82,7 @@ impl CoverageCollector {
   ) -> Result<TakePreciseCoverageReturnObject, AnyError> {
     let return_value = self
       .session
-      .post_message::<()>("Profiler.takePreciseCoverage", None)
+      .post_message("Profiler.takePreciseCoverage", None)
       .await?;
 
     let return_object = serde_json::from_value(return_value)?;
@@ -603,8 +592,8 @@ pub async fn cover_files(
         })?
     };
     let file = maybe_file.ok_or_else(|| {
-      anyhow!("Failed to fetch \"{}\" from cache.
-          Before generating coverage report, run `deno test --coverage` to ensure consistent state.",
+      anyhow!("Failed to fetch \"{}\" from cache. 
+          Before generating coverage report, run `deno test --coverage` to ensure consistent state.", 
           module_specifier
         )
     })?;