fixup! src,lib: retrieve parsed source map url from v8

Author: legendecas

doc/api/vm.md

@@ -355,7 +355,19 @@ added: REPLACEME
 When the script is compiled from a source that contains a source map magic
 comment, this property will be set to the URL of the source map.
 
-```js
+```mjs
+import vm from 'node:vm';
+
+const script = new vm.Script(`
+function myFunc() {}
+//# sourceMappingURL=sourcemap.json
+`);
+
+console.log(script.sourceMapURL);
+// Prints: sourcemap.json
+```
+
+```cjs
 const vm = require('node:vm');
 
 const script = new vm.Script(`

lib/internal/modules/cjs/loader.js

@@ -1084,7 +1084,10 @@ function wrapSafe(filename, content, cjsModuleInstance) {
       },
     });
 
-    maybeCacheSourceMap(filename, content, this, false, undefined, script.sourceMapURL);
+    // Cache the source map for the module if present.
+    if (script.sourceMapURL) {
+      maybeCacheSourceMap(filename, content, this, false, undefined, script.sourceMapURL);
+    }
 
     return script.runInThisContext({
       displayErrors: true,
@@ -1107,7 +1110,10 @@ function wrapSafe(filename, content, cjsModuleInstance) {
       },
     });
 
-    maybeCacheSourceMap(filename, content, this, false, undefined, result.sourceMapURL);
+    // Cache the source map for the module if present.
+    if (result.sourceMapURL) {
+      maybeCacheSourceMap(filename, content, this, false, undefined, result.sourceMapURL);
+    }
 
     return result.function;
   } catch (err) {

lib/internal/process/pre_execution.js

@@ -579,9 +579,11 @@ function initializeESMLoader() {
 }
 
 function initializeSourceMapsHandlers() {
-  const { setSourceMapsEnabled } =
+  const { setSourceMapsEnabled, getSourceMapsEnabled } =
     require('internal/source_map/source_map_cache');
   process.setSourceMapsEnabled = setSourceMapsEnabled;
+  // Initialize the environment flag of source maps.
+  getSourceMapsEnabled();
 }
 
 function initializeFrozenIntrinsics() {

lib/internal/source_map/source_map_cache.js

@@ -126,45 +126,48 @@ function maybeCacheSourceMap(filename, content, cjsModuleInstance, isGeneratedSo
     sourceMapURL = extractSourceMapURLMagicComment(content);
   }
 
+  // Bail out when there is no source map url.
+  if (typeof sourceMapURL !== 'string') {
+    return;
+  }
+
   if (sourceURL === undefined) {
     sourceURL = extractSourceURLMagicComment(content);
   }
 
-  if (sourceMapURL) {
-    const data = dataFromUrl(filename, sourceMapURL);
-    const url = data ? null : sourceMapURL;
-    if (cjsModuleInstance) {
-      cjsSourceMapCache.set(cjsModuleInstance, {
-        filename,
-        lineLengths: lineLengths(content),
-        data,
-        url,
-        sourceURL,
-      });
-    } else if (isGeneratedSource) {
-      const entry = {
-        lineLengths: lineLengths(content),
-        data,
-        url,
-        sourceURL
-      };
-      generatedSourceMapCache.set(filename, entry);
-      if (sourceURL) {
-        generatedSourceMapCache.set(sourceURL, entry);
-      }
-    } else {
-      // If there is no cjsModuleInstance and is not generated source assume we are in a
-      // "modules/esm" context.
-      const entry = {
-        lineLengths: lineLengths(content),
-        data,
-        url,
-        sourceURL,
-      };
-      esmSourceMapCache.set(filename, entry);
-      if (sourceURL) {
-        esmSourceMapCache.set(sourceURL, entry);
-      }
+  const data = dataFromUrl(filename, sourceMapURL);
+  const url = data ? null : sourceMapURL;
+  if (cjsModuleInstance) {
+    cjsSourceMapCache.set(cjsModuleInstance, {
+      filename,
+      lineLengths: lineLengths(content),
+      data,
+      url,
+      sourceURL,
+    });
+  } else if (isGeneratedSource) {
+    const entry = {
+      lineLengths: lineLengths(content),
+      data,
+      url,
+      sourceURL
+    };
+    generatedSourceMapCache.set(filename, entry);
+    if (sourceURL) {
+      generatedSourceMapCache.set(sourceURL, entry);
+    }
+  } else {
+    // If there is no cjsModuleInstance and is not generated source assume we are in a
+    // "modules/esm" context.
+    const entry = {
+      lineLengths: lineLengths(content),
+      data,
+      url,
+      sourceURL,
+    };
+    esmSourceMapCache.set(filename, entry);
+    if (sourceURL) {
+      esmSourceMapCache.set(sourceURL, entry);
     }
   }
 }