fix(@ngtools/webpack): show TS error message when there is no file

Author: filipesilva

packages/@ngtools/webpack/src/loader.ts

@@ -574,13 +574,16 @@ export function ngcLoader(this: LoaderContext & { _compilation: any }, source: s
             let message = '';
 
             diagnostics.forEach(diagnostic => {
-              const position = diagnostic.file.getLineAndCharacterOfPosition(diagnostic.start);
-
-              const fileName = diagnostic.file.fileName;
-              const {line, character} = position;
-
               const messageText = ts.flattenDiagnosticMessageText(diagnostic.messageText, '\n');
-              message += `${fileName} (${line + 1},${character + 1}): ${messageText}\n`;
+
+              if (diagnostic.file) {
+                const position = diagnostic.file.getLineAndCharacterOfPosition(diagnostic.start);
+                const fileName = diagnostic.file.fileName;
+                const {line, character} = position;
+                message += `${fileName} (${line + 1},${character + 1}): ${messageText}\n`;
+              } else {
+                message += `${messageText}\n`;
+              }
             });
             throw new Error(message);
           }

packages/@ngtools/webpack/src/plugin.ts

@@ -122,9 +122,14 @@ export class AotPlugin implements Tapable {
     const configResult = ts.readConfigFile(this._tsConfigPath, ts.sys.readFile);
     if (configResult.error) {
       const diagnostic = configResult.error;
-      const {line, character} = diagnostic.file.getLineAndCharacterOfPosition(diagnostic.start);
       const message = ts.flattenDiagnosticMessageText(diagnostic.messageText, '\n');
-      throw new Error(`${diagnostic.file.fileName} (${line + 1},${character + 1}): ${message})`);
+
+      if (diagnostic.file) {
+        const {line, character} = diagnostic.file.getLineAndCharacterOfPosition(diagnostic.start);
+        throw new Error(`${diagnostic.file.fileName} (${line + 1},${character + 1}): ${message})`);
+      } else {
+        throw new Error(message);
+      }
     }
 
     const tsConfigJson = configResult.config;
@@ -422,14 +427,20 @@ export class AotPlugin implements Tapable {
 
     if (diagnostics.length > 0) {
       diagnostics.forEach(diagnostic => {
-        const position = diagnostic.file.getLineAndCharacterOfPosition(diagnostic.start);
+        const messageText = ts.flattenDiagnosticMessageText(diagnostic.messageText, '\n');
+        let message;
 
-        const sourceText = diagnostic.file.getFullText();
-        let {line, character, fileName} = this._translateSourceMap(sourceText,
-          diagnostic.file.fileName, position);
+        if (diagnostic.file) {
+          const position = diagnostic.file.getLineAndCharacterOfPosition(diagnostic.start);
 
-        const messageText = ts.flattenDiagnosticMessageText(diagnostic.messageText, '\n');
-        const message = `${fileName} (${line + 1},${character + 1}): ${messageText}`;
+          const sourceText = diagnostic.file.getFullText();
+          let {line, character, fileName} = this._translateSourceMap(sourceText,
+            diagnostic.file.fileName, position);
+
+          message = `${fileName} (${line + 1},${character + 1}): ${messageText}`;
+        } else {
+          message = messageText;
+        }
 
         switch (diagnostic.category) {
           case ts.DiagnosticCategory.Error:
@@ -501,10 +512,15 @@ export class AotPlugin implements Tapable {
           if (diagnostics.length > 0) {
             const message = diagnostics
               .map(diagnostic => {
-                const {line, character} = diagnostic.file.getLineAndCharacterOfPosition(
-                  diagnostic.start);
                 const message = ts.flattenDiagnosticMessageText(diagnostic.messageText, '\n');
-                return `${diagnostic.file.fileName} (${line + 1},${character + 1}): ${message})`;
+
+                if (diagnostic.file) {
+                  const {line, character} = diagnostic.file.getLineAndCharacterOfPosition(
+                    diagnostic.start);
+                  return `${diagnostic.file.fileName} (${line + 1},${character + 1}): ${message})`;
+                } else {
+                  return message;
+                }
               })
               .join('\n');