fix: source maps in inspector for local files (#5245)

This commit changes handling of source maps by setting proper
file URLs for "file" and "sources" fields in the source map.

cli/tsc.rs

@@ -33,6 +33,7 @@ use regex::Regex;
 use serde::Deserialize;
 use serde_json::json;
 use serde_json::Value;
+use sourcemap::SourceMap;
 use std::collections::HashMap;
 use std::collections::HashSet;
 use std::fs;
@@ -718,10 +719,27 @@ impl TsCompiler {
       return Ok(());
     }
 
+    let js_key = self
+      .disk_cache
+      .get_cache_filename_with_extension(module_specifier.as_url(), "js");
+    let js_path = self.disk_cache.location.join(js_key);
+    let js_file_url =
+      Url::from_file_path(js_path).expect("Bad file URL for file");
+
     let source_map_key = self
       .disk_cache
       .get_cache_filename_with_extension(module_specifier.as_url(), "js.map");
-    self.disk_cache.set(&source_map_key, contents.as_bytes())
+
+    let mut sm = SourceMap::from_slice(contents.as_bytes())
+      .expect("Invalid source map content");
+    sm.set_file(Some(&js_file_url.to_string()));
+    sm.set_source(0, &module_specifier.to_string());
+
+    let mut output: Vec<u8> = vec![];
+    sm.to_writer(&mut output)
+      .expect("Failed to write source map");
+
+    self.disk_cache.set(&source_map_key, &output)
   }
 }
 
@@ -924,6 +942,29 @@ mod tests {
       source_code.split('\n').map(|s| s.to_string()).collect();
     let last_line = lines.pop().unwrap();
     assert!(last_line.starts_with("//# sourceMappingURL=file://"));
+
+    // Get source map file and assert it has proper URLs
+    let source_map = mock_state
+      .ts_compiler
+      .get_source_map_file(&specifier)
+      .expect("Source map not found");
+    let source_str = String::from_utf8(source_map.source_code).unwrap();
+    let source_json: Value = serde_json::from_str(&source_str).unwrap();
+
+    let js_key = mock_state
+      .ts_compiler
+      .disk_cache
+      .get_cache_filename_with_extension(specifier.as_url(), "js");
+    let js_path = mock_state.ts_compiler.disk_cache.location.join(js_key);
+    let js_file_url = Url::from_file_path(js_path).unwrap();
+
+    let file_str = source_json.get("file").unwrap().as_str().unwrap();
+    assert_eq!(file_str, js_file_url.to_string());
+
+    let sources = source_json.get("sources").unwrap().as_array().unwrap();
+    assert_eq!(sources.len(), 1);
+    let source = sources.get(0).unwrap().as_str().unwrap();
+    assert_eq!(source, specifier.to_string());
   }
 
   #[tokio::test]