module: improve typescript error message format

marco-ippolito · RafaelGSS · commit fe7994eb0c43 · 2025-07-15T19:03:11.000-03:00
PR-URL: #57687 Backport-PR-URL: #57298 Fixes: #56830 Reviewed-By: Chengzhong Wu <legendecas@gmail.com> Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> PR-URL: #56350 Fixes: nodejs/typescript#17
diff --git a/lib/internal/modules/typescript.js b/lib/internal/modules/typescript.js
@@ -59,10 +59,14 @@ function parseTypeScript(source, options) {
      * It allows us to distinguish between invalid syntax and unsupported syntax.
      */
     switch (error?.code) {
-      case 'UnsupportedSyntax':
-        throw new ERR_UNSUPPORTED_TYPESCRIPT_SYNTAX(error.message);
-      case 'InvalidSyntax':
-        throw new ERR_INVALID_TYPESCRIPT_SYNTAX(error.message);
+      case 'UnsupportedSyntax': {
+        const unsupportedSyntaxError = new ERR_UNSUPPORTED_TYPESCRIPT_SYNTAX(error.message);
+        throw decorateErrorWithSnippet(unsupportedSyntaxError, error); /* node-do-not-add-exception-line */
+      }
+      case 'InvalidSyntax': {
+        const invalidSyntaxError = new ERR_INVALID_TYPESCRIPT_SYNTAX(error.message);
+        throw decorateErrorWithSnippet(invalidSyntaxError, error); /* node-do-not-add-exception-line */
+      }
       default:
         // SWC may throw strings when something goes wrong.
         if (typeof error === 'string') { assert.fail(error); }
@@ -72,6 +76,18 @@ function parseTypeScript(source, options) {
   }
 }
 
+/**
+ *
+ * @param {Error} error the error to decorate: ERR_INVALID_TYPESCRIPT_SYNTAX, ERR_UNSUPPORTED_TYPESCRIPT_SYNTAX
+ * @param {object} amaroError the error object from amaro
+ * @returns {Error} the decorated error
+ */
+function decorateErrorWithSnippet(error, amaroError) {
+  const errorHints = `${amaroError.filename}:${amaroError.startLine}${amaroError.snippet}`;
+  error.stack = `${errorHints}${error.stack}`;
+  return error;
+}
+
 /**
  * Performs type-stripping to TypeScript source code.
  * @param {string} code TypeScript code to parse.
diff --git a/lib/internal/process/execution.js b/lib/internal/process/execution.js
@@ -39,6 +39,8 @@ const {
 // communication with JS.
 const { shouldAbortOnUncaughtToggle } = internalBinding('util');
 
+const kEvalTag = '[eval]';
+
 function tryGetCwd() {
   try {
     return process.cwd();
@@ -346,7 +348,7 @@ function evalTypeScriptModuleEntryPoint(source, print) {
  */
 function parseAndEvalModuleTypeScript(source, print) {
   // We know its a TypeScript module, we can safely emit the experimental warning.
-  const strippedSource = stripTypeScriptModuleTypes(source, getEvalModuleUrl());
+  const strippedSource = stripTypeScriptModuleTypes(source, kEvalTag);
   evalModuleEntryPoint(strippedSource, print);
 }
 
@@ -361,7 +363,7 @@ function parseAndEvalModuleTypeScript(source, print) {
  */
 function parseAndEvalCommonjsTypeScript(name, source, breakFirstLine, print, shouldLoadESM = false) {
   // We know its a TypeScript module, we can safely emit the experimental warning.
-  const strippedSource = stripTypeScriptModuleTypes(source, getEvalModuleUrl());
+  const strippedSource = stripTypeScriptModuleTypes(source, kEvalTag);
   evalScript(name, strippedSource, breakFirstLine, print, shouldLoadESM);
 }
 
diff --git a/test/es-module/test-typescript-eval.mjs b/test/es-module/test-typescript-eval.mjs
@@ -264,3 +264,23 @@ test('should not allow declare module keyword', async () => {
   match(result.stderr, /ERR_UNSUPPORTED_TYPESCRIPT_SYNTAX/);
   strictEqual(result.code, 1);
 });
+
+// TODO (marco-ippolito) Remove the extra padding from the error message
+// The padding comes from swc it will be removed in a future amaro release
+test('the error message should not contain extra padding', async () => {
+  const result = await spawnPromisified(process.execPath, [
+    '--input-type=module-typescript',
+    '--eval',
+    'declare module F { export type x = number }']);
+  strictEqual(result.stdout, '');
+  // Windows uses \r\n as line endings
+  const lines = result.stderr.replace(/\r\n/g, '\n').split('\n');
+  // The extra padding at the end should not be present
+  strictEqual(lines[0], '[eval]:1   ');
+  // The extra padding at the beginning should not be present
+  strictEqual(lines[2], '     declare module F { export type x = number }');
+  strictEqual(lines[3], '             ^^^^^^^^');
+  strictEqual(lines[5], 'SyntaxError [ERR_UNSUPPORTED_TYPESCRIPT_SYNTAX]:' +
+    ' `module` keyword is not supported. Use `namespace` instead.');
+  strictEqual(result.code, 1);
+});
diff --git a/test/fixtures/eval/eval_messages.snapshot b/test/fixtures/eval/eval_messages.snapshot
@@ -2,11 +2,7 @@
 [eval]:1
 with(this){__filename}
 ^^^^
-  x The 'with' statement is not supported. All symbols in a 'with' block will have type 'any'.
-   ,----
- 1 | with(this){__filename}
-   : ^^^^
-   `----
+The 'with' statement is not supported. All symbols in a 'with' block will have type 'any'.
 
 SyntaxError: Strict mode code may not include a with statement
 
diff --git a/test/fixtures/eval/eval_typescript.snapshot b/test/fixtures/eval/eval_typescript.snapshot
@@ -1,11 +1,7 @@
 [eval]:1
 enum Foo{};
 ^^^^
-  x TypeScript enum is not supported in strip-only mode
-   ,----
- 1 | enum Foo{};
-   : ^^^^^^^^^^
-   `----
+TypeScript enum is not supported in strip-only mode
 
 SyntaxError: Unexpected reserved word
 
@@ -20,11 +16,7 @@ Node.js *
 [eval]:1
 const foo;
       ^^^
-  x 'const' declarations must be initialized
-   ,----
- 1 | const foo;
-   :       ^^^
-   `----
+'const' declarations must be initialized
 
 SyntaxError: Missing initializer in const declaration
 
@@ -35,23 +27,15 @@ false
 [eval]:1
 interface Foo{};const foo;
           ^^^
-  x 'const' declarations must be initialized
-   ,----
- 1 | interface Foo{};const foo;
-   :                       ^^^
-   `----
+'const' declarations must be initialized
 
 SyntaxError: Unexpected identifier 'Foo'
 
 Node.js *
 [eval]:1
 function foo(){ await Promise.resolve(1)};
                 ^^^^^
-  x await isn't allowed in non-async function
-   ,----
- 1 | function foo(){ await Promise.resolve(1)};
-   :                       ^^^^^^^
-   `----
+await isn't allowed in non-async function
 
 SyntaxError: await is only valid in async functions and the top level bodies of modules
 
diff --git a/test/fixtures/eval/stdin_messages.snapshot b/test/fixtures/eval/stdin_messages.snapshot
@@ -2,11 +2,7 @@
 [stdin]:1
 with(this){__filename}
 ^^^^
-  x The 'with' statement is not supported. All symbols in a 'with' block will have type 'any'.
-   ,----
- 1 | with(this){__filename}
-   : ^^^^
-   `----
+The 'with' statement is not supported. All symbols in a 'with' block will have type 'any'.
 
 SyntaxError: Strict mode code may not include a with statement
 
diff --git a/test/fixtures/eval/stdin_typescript.snapshot b/test/fixtures/eval/stdin_typescript.snapshot
@@ -1,23 +1,15 @@
 [stdin]:1
 enum Foo{};
 ^^^^
-  x TypeScript enum is not supported in strip-only mode
-   ,----
- 1 | enum Foo{};
-   : ^^^^^^^^^^
-   `----
+TypeScript enum is not supported in strip-only mode
 
 SyntaxError: Unexpected reserved word
 
 Node.js *
 [stdin]:1
 enum Foo{};
 ^^^^
-  x TypeScript enum is not supported in strip-only mode
-   ,----
- 1 | enum Foo{};
-   : ^^^^^^^^^^
-   `----
+TypeScript enum is not supported in strip-only mode
 
 SyntaxError: Unexpected reserved word
 
@@ -39,23 +31,15 @@ Node.js *
 [stdin]:1
 const foo;
       ^^^
-  x 'const' declarations must be initialized
-   ,----
- 1 | const foo;
-   :       ^^^
-   `----
+'const' declarations must be initialized
 
 SyntaxError: Missing initializer in const declaration
 
 Node.js *
 [stdin]:1
 const foo;
       ^^^
-  x 'const' declarations must be initialized
-   ,----
- 1 | const foo;
-   :       ^^^
-   `----
+'const' declarations must be initialized
 
 SyntaxError: Missing initializer in const declaration
 
@@ -69,47 +53,31 @@ false
 [stdin]:1
 interface Foo{};const foo;
           ^^^
-  x 'const' declarations must be initialized
-   ,----
- 1 | interface Foo{};const foo;
-   :                       ^^^
-   `----
+'const' declarations must be initialized
 
 SyntaxError: Unexpected identifier 'Foo'
 
 Node.js *
 [stdin]:1
 interface Foo{};const foo;
 ^^^^^^^^^
-  x 'const' declarations must be initialized
-   ,----
- 1 | interface Foo{};const foo;
-   :                       ^^^
-   `----
+'const' declarations must be initialized
 
 SyntaxError: Unexpected strict mode reserved word
 
 Node.js *
 [stdin]:1
 function foo(){ await Promise.resolve(1)};
                 ^^^^^
-  x await isn't allowed in non-async function
-   ,----
- 1 | function foo(){ await Promise.resolve(1)};
-   :                       ^^^^^^^
-   `----
+await isn't allowed in non-async function
 
 SyntaxError: await is only valid in async functions and the top level bodies of modules
 
 Node.js *
 [stdin]:1
 function foo(){ await Promise.resolve(1)};
                 ^^^^^
-  x await isn't allowed in non-async function
-   ,----
- 1 | function foo(){ await Promise.resolve(1)};
-   :                       ^^^^^^^
-   `----
+await isn't allowed in non-async function
 
 SyntaxError: await is only valid in async functions and the top level bodies of modules
 
