Do not delete output file names that are same as input file name

src/compiler/tsbuildPublic.ts

@@ -1717,7 +1717,11 @@ namespace ts {
                 continue;
             }
             const outputs = getAllProjectOutputs(parsed, !host.useCaseSensitiveFileNames());
+            if (!outputs.length) continue;
+            const inputFileNames = new Set(parsed.fileNames.map(f => toPath(state, f)));
             for (const output of outputs) {
+                // If output name is same as input file name, do not delete and ignore the error
+                if (inputFileNames.has(toPath(state, output))) continue;
                 if (host.fileExists(output)) {
                     if (filesToDelete) {
                         filesToDelete.push(output);

src/testRunner/tsconfig.json

@@ -113,6 +113,7 @@
         "unittests/services/textChanges.ts",
         "unittests/services/transpile.ts",
         "unittests/tsbuild/amdModulesWithOut.ts",
+        "unittests/tsbuild/clean.ts",
         "unittests/tsbuild/configFileErrors.ts",
         "unittests/tsbuild/configFileExtends.ts",
         "unittests/tsbuild/containerOnlyReferenced.ts",

src/testRunner/unittests/tsbuild/clean.ts

@@ -0,0 +1,16 @@
+namespace ts {
+    describe("unittests:: tsbuild - clean", () => {
+        verifyTsc({
+            scenario: "clean",
+            subScenario: `file name and output name clashing`,
+            commandLineArgs: ["--b", "/src/tsconfig.json", "-clean"],
+            fs: () => loadProjectFromFiles({
+                "/src/index.js": "",
+                "/src/bar.ts": "",
+                "/src/tsconfig.json": JSON.stringify({
+                    compilerOptions: { allowJs: true },
+                }),
+            }),
+        });
+    });
+}

tests/baselines/reference/tsbuild/clean/initial-build/file-name-and-output-name-clashing.js

@@ -0,0 +1,20 @@
+Input::
+//// [/lib/lib.d.ts]
+
+
+//// [/src/bar.ts]
+
+
+//// [/src/index.js]
+
+
+//// [/src/tsconfig.json]
+{"compilerOptions":{"allowJs":true}}
+
+
+
+Output::
+/lib/tsc --b /src/tsconfig.json -clean
+exitCode:: ExitStatus.Success
+
+