From f51b93e571ac8fa52d0bc1df4e7fb263097242e5 Mon Sep 17 00:00:00 2001
From: Glenn <33450392+glenn2223@users.noreply.github.com>
Date: Thu, 15 Dec 2022 11:13:14 +0000
Subject: [PATCH 1/3] Applied fix

The `id` passed to `async load(id)` has certain edge cases when drives letters can de different cases or file**names** can have different cases. By normalising the `emittedFiles` we will always find the `code` we need and, as such, will not throw
---
 packages/typescript/src/index.ts      | 4 ++--
 packages/typescript/src/outputFile.ts | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/packages/typescript/src/index.ts b/packages/typescript/src/index.ts
index 1cb79dbda..9dab51acf 100644
--- a/packages/typescript/src/index.ts
+++ b/packages/typescript/src/index.ts
@@ -69,7 +69,7 @@ export default function typescript(options: RollupTypescriptOptions = {}): Plugi
             if (parsedOptions.options.composite || parsedOptions.options.incremental) {
               tsCache.cacheCode(fileName, data);
             }
-            emittedFiles.set(fileName, data);
+            emittedFiles.set(fileName.toLowerCase(), data);
           },
           status(diagnostic) {
             watchProgramHelper.handleStatus(diagnostic);
@@ -143,7 +143,7 @@ export default function typescript(options: RollupTypescriptOptions = {}): Plugi
         parsedOptions.fileNames.push(fileName);
       }
 
-      const output = findTypescriptOutput(ts, parsedOptions, id, emittedFiles, tsCache);
+      const output = findTypescriptOutput(ts, parsedOptions, fileName, emittedFiles, tsCache);
 
       return output.code != null ? (output as SourceDescription) : null;
     },
diff --git a/packages/typescript/src/outputFile.ts b/packages/typescript/src/outputFile.ts
index e2ff67220..05346b955 100644
--- a/packages/typescript/src/outputFile.ts
+++ b/packages/typescript/src/outputFile.ts
@@ -41,8 +41,8 @@ export function getEmittedFile(
 ): string | undefined {
   let code: string | undefined;
   if (fileName) {
-    if (emittedFiles.has(fileName)) {
-      code = emittedFiles.get(fileName);
+    if (emittedFiles.has(fileName.toLowerCase())) {
+      code = emittedFiles.get(fileName.toLowerCase());
     } else {
       code = tsCache.getCached(fileName);
     }

From a7d7658ecf59d4a719896ef1aa89d3c08196f482 Mon Sep 17 00:00:00 2001
From: Glenn <33450392+glenn2223@users.noreply.github.com>
Date: Thu, 15 Dec 2022 12:13:27 +0000
Subject: [PATCH 2/3] Added case test

It's such an edge case and I don't know the reason/case in order to force it
---
 .../typescript/test/fixtures/caseTest/Main.ts |  3 +++
 .../test/fixtures/caseTest/tsconfig.json      |  1 +
 packages/typescript/test/test.js              | 24 +++++++++++++++++++
 3 files changed, 28 insertions(+)
 create mode 100644 packages/typescript/test/fixtures/caseTest/Main.ts
 create mode 100644 packages/typescript/test/fixtures/caseTest/tsconfig.json

diff --git a/packages/typescript/test/fixtures/caseTest/Main.ts b/packages/typescript/test/fixtures/caseTest/Main.ts
new file mode 100644
index 000000000..ccf559ebb
--- /dev/null
+++ b/packages/typescript/test/fixtures/caseTest/Main.ts
@@ -0,0 +1,3 @@
+const answer = 42;
+// eslint-disable-next-line no-console
+console.log(`the answer is ${answer}`);
diff --git a/packages/typescript/test/fixtures/caseTest/tsconfig.json b/packages/typescript/test/fixtures/caseTest/tsconfig.json
new file mode 100644
index 000000000..0967ef424
--- /dev/null
+++ b/packages/typescript/test/fixtures/caseTest/tsconfig.json
@@ -0,0 +1 @@
+{}
diff --git a/packages/typescript/test/test.js b/packages/typescript/test/test.js
index ecf5b0597..f6810d55b 100644
--- a/packages/typescript/test/test.js
+++ b/packages/typescript/test/test.js
@@ -1346,3 +1346,27 @@ test.serial('noForceEmit option defers to tsconfig.json for noEmit', async (t) =
   const originalCode = fs.readFileSync(path.join(__dirname, input), 'utf8');
   t.is(output[0].code, originalCode);
 });
+
+test.serial('incorrect file case still compiles', async (t) => {
+  const warnings = [];
+  const bundle = await rollup({
+    input: 'fixtures/caseTest/Main.ts',
+    plugins: [typescript({ tsconfig: 'fixtures/caseTest/tsconfig.json', target: 'es5' })],
+    onwarn(warning) {
+      warnings.push(warning);
+    }
+  });
+  // generate a single output bundle, in which case, declaration files were not correctly emitted
+  const output = await getCode(
+    bundle,
+    { format: 'es', file: 'fixtures/caseTest/dist/Main.js' },
+    true
+  );
+
+  t.deepEqual(
+    output.map((out) => out.fileName),
+    // no `main.d.ts`, main.js is passed through
+    ['Main.js']
+  );
+  t.is(warnings.length, 0);
+});

From b9cd33cd6978f0e4c13b799623698570d15e49fa Mon Sep 17 00:00:00 2001
From: Glenn <33450392+glenn2223@users.noreply.github.com>
Date: Mon, 19 Dec 2022 12:12:28 +0000
Subject: [PATCH 3/3] Switch back to `id`

Accidentally left in a code tweak from earlier tests - reverted
---
 packages/typescript/src/index.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/typescript/src/index.ts b/packages/typescript/src/index.ts
index 9dab51acf..d1c234ded 100644
--- a/packages/typescript/src/index.ts
+++ b/packages/typescript/src/index.ts
@@ -143,7 +143,7 @@ export default function typescript(options: RollupTypescriptOptions = {}): Plugi
         parsedOptions.fileNames.push(fileName);
       }
 
-      const output = findTypescriptOutput(ts, parsedOptions, fileName, emittedFiles, tsCache);
+      const output = findTypescriptOutput(ts, parsedOptions, id, emittedFiles, tsCache);
 
       return output.code != null ? (output as SourceDescription) : null;
     },