From 2e3937047fd030bf46239086caca806dc67c8628 Mon Sep 17 00:00:00 2001
From: Andy Stanberry <andystanberry@gmail.com>
Date: Tue, 28 Sep 2021 19:11:52 -0400
Subject: [PATCH 1/4] failing swc transpiler repl test

---
 src/test/repl/repl.spec.ts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/test/repl/repl.spec.ts b/src/test/repl/repl.spec.ts
index 6ec33f434..d3b03a83d 100644
--- a/src/test/repl/repl.spec.ts
+++ b/src/test/repl/repl.spec.ts
@@ -30,6 +30,16 @@ test('should run REPL when --interactive passed and stdin is not a TTY', async (
   expect(stdout).toBe('> 123\n' + 'undefined\n' + '> ');
 });
 
+test('should echo a value when using the swc transpiler', async () => {
+  const execPromise = exec(
+    `${CMD_TS_NODE_WITH_PROJECT_FLAG} --interactive  --transpiler ts-node/transpilers/swc-experimental`
+  );
+  execPromise.child.stdin!.end('400\n401\n');
+  const { err, stdout } = await execPromise;
+  expect(err).toBe(null);
+  expect(stdout).toBe('> 400\n>401\n > ');
+});
+
 test('REPL has command to get type information', async () => {
   const execPromise = exec(`${CMD_TS_NODE_WITH_PROJECT_FLAG} --interactive`);
   execPromise.child.stdin!.end('\nconst a = 123\n.type a');

From 561b6ddd4a5ca873edf3062068623583a32be128 Mon Sep 17 00:00:00 2001
From: Andrew Bradley <abradley@brightcove.com>
Date: Mon, 27 Dec 2021 23:05:21 +0000
Subject: [PATCH 2/4] Strip sourcemap comment from REPL JS before diffing and
 executing

---
 src/repl.ts | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/repl.ts b/src/repl.ts
index ad399b850..34332b8f5 100644
--- a/src/repl.ts
+++ b/src/repl.ts
@@ -480,6 +480,8 @@ export function createEvalAwarePartialHost(
   return { readFile, fileExists };
 }
 
+const sourcemapCommentRe = /\/\/# ?sourceMappingURL=\S+[\s\r\n]*$/;
+
 type AppendCompileAndEvalInputResult =
   | { containsTopLevelAwait: true; valuePromise: Promise<any> }
   | { containsTopLevelAwait: false; value: any };
@@ -525,8 +527,14 @@ function appendCompileAndEvalInput(options: {
 
   output = adjustUseStrict(output);
 
+  const outputWithoutSourcemapComment = output.replace(sourcemapCommentRe, '');
+  const oldOutputWithoutSourcemapComment = state.output.replace(
+    sourcemapCommentRe,
+    ''
+  );
+
   // Use `diff` to check for new JavaScript to execute.
-  const changes = diffLines(state.output, output);
+  const changes = diffLines(oldOutputWithoutSourcemapComment, outputWithoutSourcemapComment);
 
   if (isCompletion) {
     undo();

From 339df1d669b4f538f59db82bc68d9a86a4f84363 Mon Sep 17 00:00:00 2001
From: Andrew Bradley <abradley@brightcove.com>
Date: Mon, 27 Dec 2021 23:12:09 +0000
Subject: [PATCH 3/4] add comment about how repl does not do sourcemaps

---
 src/repl.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/repl.ts b/src/repl.ts
index 34332b8f5..a0f5e78b5 100644
--- a/src/repl.ts
+++ b/src/repl.ts
@@ -527,6 +527,12 @@ function appendCompileAndEvalInput(options: {
 
   output = adjustUseStrict(output);
 
+  // Note: REPL does not respect sourcemaps!
+  // To properly do that, we'd need to prefix the code we eval -- which comes
+  // from `diffLines` -- with newlines so that it's at the proper line numbers.
+  // Then we'd need to ensure each bit of eval-ed code, if there are multiples,
+  // has the sourcemap appended to it.
+  // We might also need to integrate with our sourcemap hooks' cache; I'm not sure.
   const outputWithoutSourcemapComment = output.replace(sourcemapCommentRe, '');
   const oldOutputWithoutSourcemapComment = state.output.replace(
     sourcemapCommentRe,

From 82152ebfce2314111054f727688fdfd899ddf4b7 Mon Sep 17 00:00:00 2001
From: Andrew Bradley <abradley@brightcove.com>
Date: Mon, 27 Dec 2021 23:12:44 +0000
Subject: [PATCH 4/4] lint-fix

---
 src/repl.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/repl.ts b/src/repl.ts
index a0f5e78b5..e402f3df7 100644
--- a/src/repl.ts
+++ b/src/repl.ts
@@ -540,7 +540,10 @@ function appendCompileAndEvalInput(options: {
   );
 
   // Use `diff` to check for new JavaScript to execute.
-  const changes = diffLines(oldOutputWithoutSourcemapComment, outputWithoutSourcemapComment);
+  const changes = diffLines(
+    oldOutputWithoutSourcemapComment,
+    outputWithoutSourcemapComment
+  );
 
   if (isCompletion) {
     undo();