src,lib: print prinstine source when source map source not found

Print unmapped source lines when the source map source is not
found. Error stacks should be correctly mapped even when the
source is absent.
PR-URL: #44052
Refs: #44019
Reviewed-By: Ben Coe <bencoe@gmail.com>

Author: legendecas

lib/internal/source_map/prepare_stack_trace.js

@@ -139,17 +139,21 @@ function getErrorSource(
 originalLine,
 originalColumn
 ){
-letexceptionLine='';
 constoriginalSourcePathNoScheme=
 StringPrototypeStartsWith(originalSourcePath,'file://') ?
 fileURLToPath(originalSourcePath) : originalSourcePath;
 constsource=getOriginalSource(
 sourceMap.payload,
 originalSourcePath
 );
+if(typeofsource!=='string'){
+return;
+}
 constlines=RegExpPrototypeSymbolSplit(/\r?\n/,source,originalLine+1);
 constline=lines[originalLine];
-if(!line)returnexceptionLine;
+if(!line){
+return;
+}
 
 // Display ^ in appropriate position, regardless of whether tabs or
 // spaces are used:
@@ -161,7 +165,7 @@ function getErrorSource(
 }
 prefix=StringPrototypeSlice(prefix,0,-1);// The last character is '^'.
 
-exceptionLine=
+constexceptionLine=
 `${originalSourcePathNoScheme}:${originalLine+1}\n${line}\n${prefix}^\n\n`;
 returnexceptionLine;
 }
@@ -184,10 +188,7 @@ function getOriginalSource(payload, originalSourcePath) {
 source=readFileSync(originalSourcePathNoScheme,'utf8');
 }catch(err){
 debug(err);
-source='';
 }
-}else{
-source='';
 }
 returnsource;
 }

src/node_errors.cc

@@ -105,7 +105,9 @@ static std::string GetErrorSource(Isolate* isolate,
 if (has_source_map_url && env != nullptr && env->source_maps_enabled()) {
  std::string source = GetSourceMapErrorSource(
  isolate, context, message, added_exception_line);
-return *added_exception_line ? source : sourceline;
+if (*added_exception_line) {
+return source;
+ }
  }
 
 // Because of how node modules work, all scripts are wrapped with a

test/fixtures/source-map/no-source.js

@@ -0,0 +1,10 @@
+functionThrow(){
+thrownewError('foo');
+}
+
+Throw();
+
+// To recreate:
+//
+// npx tsc --outDir test/fixtures/source-map --sourceMap test/fixtures/source-map/no-source.ts
+// rename the "source.[0]" to "file-not-exists.ts"

test/fixtures/source-map/no-source.js.map

@@ -0,0 +1,6 @@
+// Flags: --enable-source-maps
+
+'use strict';
+require('../common');
+
+require('../fixtures/source-map/no-source.js');

test/fixtures/source-map/no-source.ts

@@ -0,0 +1,17 @@
+*no-source.js:2
+ throw new Error('foo');
+ ^
+
+Error: foo
+ at Throw (*file-not-exists.ts:2:9)
+ at Object.<anonymous> (*file-not-exists.ts:5:1)
+ at Module._compile (node:internal/modules/cjs/loader:*)
+ at Module._extensions..js (node:internal/modules/cjs/loader:*)
+ at Module.load (node:internal/modules/cjs/loader:*)
+ at Module._load (node:internal/modules/cjs/loader:*)
+ at Module.require (node:internal/modules/cjs/loader:*)
+ at require (node:internal/modules/cjs/helpers:*)
+ at Object.<anonymous> (*source_map_no_source_file.js:6:1)
+ at Module._compile (node:internal/modules/cjs/loader:*)
+
+Node.js *