diff --git a/src/bin.ts b/src/bin.ts
index 5a34005..eb1ff76 100644
--- a/src/bin.ts
+++ b/src/bin.ts
@@ -1,6 +1,7 @@
+// tslint:disable-next-line no-require-imports no-var-requires
 import program from 'commander';
 import chalk from 'chalk';
-import { run } from './index';
+import { run } from './run';
 const { version } = require('../package.json');
 // import * as BenchInit from './benchmark/init'
 // import * as Benchmark from './benchmark/benchmark';
@@ -28,8 +29,11 @@ Give me an Elm file, I'll compile it behind the scenes using Elm 0.19.1, and the
   .parse(process.argv);
 
 const { output, optimizeSpeed } = program.opts();
-run({
-  inputFilePath: program.args[0],
-  outputFilePath: output,
-  optimizeSpeed
-}).catch((e) => console.error(e));
+run(
+  {
+    inputFilePath: program.args[0],
+    outputFilePath: output,
+    optimizeSpeed
+  },
+  console.log.bind(console),
+).catch((e) => console.error(e));
diff --git a/src/run.ts b/src/run.ts
new file mode 100644
index 0000000..2ec84fa
--- /dev/null
+++ b/src/run.ts
@@ -0,0 +1,108 @@
+// tslint:disable-next-line no-require-imports no-var-requires
+import program from 'commander';
+import * as path from 'path';
+import * as Transform from './transform';
+import { toolDefaults } from './types';
+import { compileToStringSync } from 'node-elm-compiler';
+import * as fs from 'fs';
+// import * as BenchInit from './benchmark/init'
+// import * as Benchmark from './benchmark/benchmark';
+// import * as Reporting from './benchmark/reporting';
+
+export async function run(
+  options: {
+    inputFilePath: string | undefined,
+    outputFilePath: string | null,
+    optimizeSpeed: boolean
+  },
+  log: (message?: any, ...optionalParams: any[]) => void
+) {
+  const dirname = process.cwd();
+  let jsSource: string = '';
+  let elmFilePath = undefined;
+
+  const replacements = null;
+  const inputFilePath = options.inputFilePath;
+  const o3Enabled = options.optimizeSpeed;
+
+  // if (program.initBenchmark) {
+  //   console.log(`Initializing benchmark ${program.initBenchmark}`)
+  //   BenchInit.generate(program.initBenchmark)
+  //   process.exit(0)
+  // }
+
+  //   if (program.benchmark) {
+  //       const options = {
+  //           compile: true,
+  //           gzip: true,
+  //           minify: true,
+  //           verbose: true,
+  //           assetSizes: true,
+  //           runBenchmark: [
+  //               {
+  //                   browser: Browser.Chrome,
+  //                   headless: true,
+  //               }
+  //           ],
+  //           transforms: benchmarkDefaults(o3Enabled, replacements),
+  //       };
+  //       const report = await Benchmark.run(options, [
+  //         {
+  //           name: 'Benchmark',
+  //           dir: program.benchmark,
+  //           elmFile: 'V8/Benchmark.elm',
+  //         }
+  //       ]);
+  //       console.log(Reporting.terminal(report));
+  // //       fs.writeFileSync('./results.markdown', Reporting.markdownTable(result));
+  //       process.exit(0)
+  //   }
+
+  if (inputFilePath && inputFilePath.endsWith('.js')) {
+    jsSource = fs.readFileSync(inputFilePath, 'utf8');
+    log('Optimizing existing JS...');
+  } else if (inputFilePath && inputFilePath.endsWith('.elm')) {
+    elmFilePath = inputFilePath;
+    jsSource = compileToStringSync([inputFilePath], {
+      output: 'output/elm.opt.js',
+      cwd: dirname,
+      optimize: true,
+      processOpts:
+      // ignore stdout
+      {
+        stdio: ['inherit', 'ignore', 'inherit'],
+      },
+    });
+    if (jsSource != '') {
+      log('Compiled, optimizing JS...');
+    } else {
+      process.exit(1)
+    }
+  } else {
+    console.error('Please provide a path to an Elm file.');
+    program.outputHelp();
+    return;
+  }
+  if (jsSource != '') {
+    const transformed = await Transform.transform(
+      dirname,
+      jsSource,
+      elmFilePath,
+      false,
+      toolDefaults(o3Enabled, replacements),
+    );
+
+    // Make sure all the folders up to the output file exist, if not create them.
+    // This mirrors elm make behavior.
+    const outputDirectory = path.dirname(program.output);
+    if (!fs.existsSync(outputDirectory)) {
+      fs.mkdirSync(outputDirectory, { recursive: true });
+    }
+    fs.writeFileSync(program.output, transformed);
+    const fileName = path.basename(inputFilePath);
+    log('Success!');
+    log('');
+    log(`   ${fileName} ───> ${program.output}`);
+    log('');
+  }
+}