fix(#10761): graph errors reported as diagnostics for `Deno.emit()` (#10767)

Fixes #10761

4 files changed, 88 insertions, 7 deletions

diff --git a/cli/diagnostics.rs b/cli/diagnostics.rs
index b7327d72c..695330af3 100644
--- a/cli/diagnostics.rs
+++ b/cli/diagnostics.rs
@@ -6,7 +6,9 @@ use deno_core::serde::Deserialize;
 use deno_core::serde::Deserializer;
 use deno_core::serde::Serialize;
 use deno_core::serde::Serializer;
+use deno_core::ModuleSpecifier;
 use regex::Regex;
+use std::collections::HashMap;
 use std::error::Error;
 use std::fmt;
 
@@ -233,13 +235,14 @@ impl Diagnostic {
       _ => "",
     };
 
+    let code = if self.code >= 900001 {
+      "".to_string()
+    } else {
+      colors::bold(format!("TS{} ", self.code)).to_string()
+    };
+
     if !category.is_empty() {
-      write!(
-        f,
-        "{} [{}]: ",
-        colors::bold(&format!("TS{}", self.code)),
-        category
-      )
+      write!(f, "{}[{}]: ", code, category)
     } else {
       Ok(())
     }
@@ -359,6 +362,24 @@ impl Diagnostics {
     Diagnostics(diagnostics)
   }
 
+  pub fn extend_graph_errors(
+    &mut self,
+    errors: HashMap<ModuleSpecifier, String>,
+  ) {
+    self.0.extend(errors.into_iter().map(|(s, e)| Diagnostic {
+      category: DiagnosticCategory::Error,
+      code: 900001,
+      start: None,
+      end: None,
+      message_text: Some(e),
+      message_chain: None,
+      source: None,
+      source_line: None,
+      file_name: Some(s.to_string()),
+      related_information: None,
+    }));
+  }
+
   pub fn is_empty(&self) -> bool {
     self.0.is_empty()
   }
diff --git a/cli/module_graph.rs b/cli/module_graph.rs
index 8ea8b7f88..e56f26c15 100644
--- a/cli/module_graph.rs
+++ b/cli/module_graph.rs
@@ -1273,6 +1273,18 @@ impl Graph {
     Ok(())
   }
 
+  /// Retrieve the first module loading error from the graph and return it.
+  pub fn get_errors(&self) -> HashMap<ModuleSpecifier, String> {
+    self
+      .modules
+      .iter()
+      .filter_map(|(s, sl)| match sl {
+        ModuleSlot::Err(err) => Some((s.clone(), err.to_string())),
+        _ => None,
+      })
+      .collect()
+  }
+
   /// Retrieve a map that contains a representation of each module in the graph
   /// which can be used to provide code to a module loader without holding all
   /// the state to be able to operate on the graph.
diff --git a/cli/ops/runtime_compiler.rs b/cli/ops/runtime_compiler.rs
index 099f2d555..dd500077a 100644
--- a/cli/ops/runtime_compiler.rs
+++ b/cli/ops/runtime_compiler.rs
@@ -118,12 +118,14 @@ async fn op_emit(
   };
   let graph = builder.get_graph();
   let debug = program_state.flags.log_level == Some(log::Level::Debug);
-  let (files, result_info) = graph.emit(EmitOptions {
+  let graph_errors = graph.get_errors();
+  let (files, mut result_info) = graph.emit(EmitOptions {
     bundle_type,
     check: args.check.unwrap_or(true),
     debug,
     maybe_user_config: args.compiler_options,
   })?;
+  result_info.diagnostics.extend_graph_errors(graph_errors);
 
   Ok(json!({
     "diagnostics": result_info.diagnostics,
diff --git a/cli/tests/compiler_api_test.ts b/cli/tests/compiler_api_test.ts
index b9a08d5ca..2e0a8820c 100644
--- a/cli/tests/compiler_api_test.ts
+++ b/cli/tests/compiler_api_test.ts
@@ -456,3 +456,49 @@ Deno.test({
     assert(files["deno:///bundle.js.map"]);
   },
 });
+
+Deno.test({
+  name: `Deno.emit() - graph errors as diagnostics`,
+  ignore: Deno.build.os === "windows",
+  async fn() {
+    const { diagnostics } = await Deno.emit("/a.ts", {
+      sources: {
+        "/a.ts": `import { b } from "./b.ts";
+        console.log(b);`,
+      },
+    });
+    assert(diagnostics);
+    assertEquals(diagnostics, [
+      {
+        category: 1,
+        code: 2305,
+        start: { line: 0, character: 9 },
+        end: { line: 0, character: 10 },
+        messageText:
+          `Module '"deno:///missing_dependency.d.ts"' has no exported member 'b'.`,
+        messageChain: null,
+        source: null,
+        sourceLine: 'import { b } from "./b.ts";',
+        fileName: "file:///a.ts",
+        relatedInformation: null,
+      },
+      {
+        category: 1,
+        code: 900001,
+        start: null,
+        end: null,
+        messageText: "Unable to find specifier in sources: file:///b.ts",
+        messageChain: null,
+        source: null,
+        sourceLine: null,
+        fileName: "file:///b.ts",
+        relatedInformation: null,
+      },
+    ]);
+    assert(
+      Deno.formatDiagnostics(diagnostics).includes(
+        "Unable to find specifier in sources: file:///b.ts",
+      ),
+    );
+  },
+});