diff --git a/cli/msg.rs b/cli/msg.rs
index 5c50c96ab3..3e5000296c 100644
--- a/cli/msg.rs
+++ b/cli/msg.rs
@@ -55,11 +55,10 @@ pub fn enum_name_media_type(mt: MediaType) -> &'static str {
 #[derive(Clone, Copy, PartialEq, Debug)]
 pub enum CompilerRequestType {
   Compile = 0,
-  Transpile = 1,
-  Bundle = 2,
-  RuntimeCompile = 3,
-  RuntimeBundle = 4,
-  RuntimeTranspile = 5,
+  Bundle = 1,
+  RuntimeCompile = 2,
+  RuntimeBundle = 3,
+  RuntimeTranspile = 4,
 }
 
 impl Serialize for CompilerRequestType {
@@ -69,11 +68,10 @@ impl Serialize for CompilerRequestType {
   {
     let value: i32 = match self {
       CompilerRequestType::Compile => 0 as i32,
-      CompilerRequestType::Transpile => 1 as i32,
-      CompilerRequestType::Bundle => 2 as i32,
-      CompilerRequestType::RuntimeCompile => 3 as i32,
-      CompilerRequestType::RuntimeBundle => 4 as i32,
-      CompilerRequestType::RuntimeTranspile => 5 as i32,
+      CompilerRequestType::Bundle => 1 as i32,
+      CompilerRequestType::RuntimeCompile => 2 as i32,
+      CompilerRequestType::RuntimeBundle => 3 as i32,
+      CompilerRequestType::RuntimeTranspile => 4 as i32,
     };
     Serialize::serialize(&value, serializer)
   }
diff --git a/cli/tsc/99_main_compiler.js b/cli/tsc/99_main_compiler.js
index 4d44375c6d..1bef2cf650 100644
--- a/cli/tsc/99_main_compiler.js
+++ b/cli/tsc/99_main_compiler.js
@@ -406,15 +406,6 @@ delete Object.prototype.__proto__;
     target: ts.ScriptTarget.ESNext,
   };
 
-  const DEFAULT_TRANSPILE_OPTIONS = {
-    esModuleInterop: true,
-    inlineSourceMap: true,
-    jsx: ts.JsxEmit.React,
-    module: ts.ModuleKind.ESNext,
-    removeComments: true,
-    target: ts.ScriptTarget.ESNext,
-  };
-
   const DEFAULT_RUNTIME_COMPILE_OPTIONS = {
     outDir: undefined,
   };
@@ -943,11 +934,10 @@ delete Object.prototype.__proto__;
   // Update carefully!
   const CompilerRequestType = {
     Compile: 0,
-    Transpile: 1,
-    Bundle: 2,
-    RuntimeCompile: 3,
-    RuntimeBundle: 4,
-    RuntimeTranspile: 5,
+    Bundle: 1,
+    RuntimeCompile: 2,
+    RuntimeBundle: 3,
+    RuntimeTranspile: 4,
   };
 
   function createBundleWriteFile(state) {
@@ -1452,71 +1442,6 @@ delete Object.prototype.__proto__;
     };
   }
 
-  function transpile({
-    config: configText,
-    configPath,
-    cwd,
-    performance,
-    sourceFiles,
-  }) {
-    if (performance) {
-      performanceStart();
-    }
-    log(">>> transpile start");
-    let compilerOptions;
-    if (configText && configPath && cwd) {
-      const { options, ...response } = configure(
-        DEFAULT_TRANSPILE_OPTIONS,
-        configText,
-        configPath,
-        cwd,
-      );
-      const diagnostics = processConfigureResponse(response, configPath);
-      if (diagnostics && diagnostics.length) {
-        return {
-          diagnostics: fromTypeScriptDiagnostic(diagnostics),
-          emitMap: {},
-        };
-      }
-      compilerOptions = options;
-    } else {
-      compilerOptions = Object.assign({}, DEFAULT_TRANSPILE_OPTIONS);
-    }
-    const emitMap = {};
-    let diagnostics = [];
-    for (const { sourceCode, fileName } of sourceFiles) {
-      const {
-        outputText,
-        sourceMapText,
-        diagnostics: diags,
-      } = ts.transpileModule(sourceCode, {
-        fileName,
-        compilerOptions,
-        reportDiagnostics: true,
-      });
-      if (diags) {
-        diagnostics = diagnostics.concat(...diags);
-      }
-      emitMap[`${fileName}.js`] = { filename: fileName, contents: outputText };
-      // currently we inline source maps, but this is good logic to have if this
-      // ever changes
-      if (sourceMapText) {
-        emitMap[`${fileName}.map`] = {
-          filename: fileName,
-          contents: sourceMapText,
-        };
-      }
-    }
-    performanceProgram({ fileCount: sourceFiles.length });
-    const stats = performance ? performanceEnd() : undefined;
-    log("<<< transpile end");
-    return {
-      diagnostics: fromTypeScriptDiagnostic(diagnostics),
-      emitMap,
-      stats,
-    };
-  }
-
   function bundle({
     config,
     configPath,
@@ -1794,11 +1719,6 @@ delete Object.prototype.__proto__;
         opCompilerRespond(result);
         break;
       }
-      case CompilerRequestType.Transpile: {
-        const result = transpile(request);
-        opCompilerRespond(result);
-        break;
-      }
       case CompilerRequestType.Bundle: {
         const result = bundle(request);
         opCompilerRespond(result);