diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..4330bf6
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,24 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: purescript-contrib/setup-purescript@main
+
+      - name: Install esbuild
+        run: npm install
+
+      - name: Build source
+        run: spago build
+
+      - name: Run tests
+        run: npm run test
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..a25998f
--- /dev/null
+++ b/package.json
@@ -0,0 +1,11 @@
+{
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "test:bundle": "spago bundle-app --main Test.Worker --to output/Test.Worker.js --platform node",
+    "test": "npm run test:bundle && spago test"
+  },
+  "devDependencies": {
+    "esbuild": "^0.14.39"
+  }
+}
diff --git a/packages.dhall b/packages.dhall
index b51cba4..5ec3f48 100644
--- a/packages.dhall
+++ b/packages.dhall
@@ -1,4 +1,5 @@
 let upstream =
-      https://github.com/purescript/package-sets/releases/download/psc-0.14.3-20210811/packages.dhall sha256:a2de7ef2f2e753733eddfa90573a82da0c7c61d46fa87d015b7f15ef8a6e97d5
+      https://github.com/purescript/package-sets/releases/download/psc-0.15.0-20220509/packages.dhall
+        sha256:d4c1a03606efdbb7bb7745a9d3aa908cb1ba5611921373659a4c7bf1c41c106c
 
 in  upstream
diff --git a/spago.dhall b/spago.dhall
index ba25229..49e44bb 100644
--- a/spago.dhall
+++ b/spago.dhall
@@ -11,6 +11,7 @@
   , "exceptions"
   , "foldable-traversable"
   , "foreign-object"
+  , "integers"
   , "newtype"
   , "parallel"
   , "prelude"
diff --git a/src/Node/WorkerBees.js b/src/Node/WorkerBees.js
index 2b4135d..d35a82a 100644
--- a/src/Node/WorkerBees.js
+++ b/src/Node/WorkerBees.js
@@ -1,22 +1,17 @@
-var fs = require("fs");
-var workerThreads = require("worker_threads");
+import workerThreads from "worker_threads";
 
-exports.spawnImpl = function(left, right, worker, options, cb) {
+export function spawnImpl(left, right, worker, options, cb) {
   worker.resolve(function(err, res) {
     if (err) {
       return cb(left(err))();
     }
     var thread;
-    var requirePath = res.filePath.replace(/\\/g, "\\\\");
-    var jsEval = res.export
-      ? [
-          'var worker = require("' + requirePath + '").' + res.export + ';',
-          'worker.spawn ? worker.spawn() : worker();'
-        ].join('\n')
-      : 'require("' + requirePath + '")';
+    // Must be either an absolute path or a relative path (i.e. relative to the
+    // current working directory) starting with ./ or ../, if a filepath.
+    // https://nodejs.org/api/worker_threads.html#new-workerfilename-options
+    var importPath = res.filePath;
     try {
-      thread = new workerThreads.Worker(jsEval, {
-        eval: true,
+      thread = new workerThreads.Worker(importPath, {
         workerData: options.workerData
       });
       thread.on('message', function(value) {
@@ -35,77 +30,9 @@ exports.spawnImpl = function(left, right, worker, options, cb) {
       cb(left(e))();
     }
   });
-};
-
-exports.makeImpl = function(ctor) {
-  var originalFn = Error.prepareStackTrace;
-  var worker, workerError, callerFilePath, callerLineNumber;
-
-  Error.prepareStackTrace = function(err, stack) {
-    return stack;
-  };
-
-  try {
-    var stack = new Error().stack;
-
-    do {
-      var frame = stack.shift();
-      callerFilePath = frame.getFileName();
-      callerLineNumber = frame.getLineNumber();
-    } while (callerFilePath === __filename);
-
-    Error.prepareStackTrace = originalFn;
-
-  } catch (e) {
-    Error.prepareStackTrace = originalFn;
-    throw new Error("Unable to define worker.");
-  }
-
-  function resolve(cb) {
-    if (worker || workerError) {
-      return cb(workerError, worker);
-    }
-
-    fs.readFile(callerFilePath, function(err, buff) {
-      if (err) {
-        workerError = err
-        return cb(workerError);
-      }
-
-      var callerModuleLines = buff.toString('utf8').split('\n');
-      var callerLine = callerModuleLines[callerLineNumber - 1];
-      var workerName = callerLine.match(new RegExp("^var ([\\p{Ll}_][\\p{L}0-9_']*) = Node_WorkerBees\\.make", "u"));
-
-      if (workerName) {
-        var exportRegex = new RegExp("^\\s*" + workerName[1] + ":\\s*" + workerName[1]);
-        for (var i = callerLineNumber; i < callerModuleLines.length; i++) {
-          if (callerModuleLines[i] === "module.exports = {") {
-            var exported = callerModuleLines.slice(i).some(function(line) {
-              return exportRegex.test(line);
-            });
-            if (exported) {
-              worker = {
-                filePath: callerFilePath,
-                export: workerName[1]
-              };
-              return cb(void 0, worker);
-            }
-          }
-        }
-      }
-
-      workerError = new Error("Worker must be defined in a top-level, exported binding");
-      cb(workerError);
-    });
-  }
-
-  return {
-    resolve: resolve,
-    spawn: mainImpl(ctor)
-  };
-};
+}
 
-exports.unsafeMakeImpl = function(params) {
+export function unsafeMakeImpl(params) {
   return {
     resolve: function(cb) {
       cb(void 0, params);
@@ -114,9 +41,9 @@ exports.unsafeMakeImpl = function(params) {
       throw new Error("Cannot spawn unsafe worker directly.");
     }
   };
-};
+}
 
-function mainImpl(ctor) {
+export function mainImpl(ctor) {
   return function() {
     if (workerThreads.isMainThread) {
       throw new Error("Worker running on main thread.");
@@ -143,13 +70,11 @@ function mainImpl(ctor) {
   };
 }
 
-exports.mainImpl = mainImpl;
-
-exports.postImpl = function(value, worker) {
+export function postImpl(value, worker) {
   worker.postMessage(value);
-};
+}
 
-exports.terminateImpl = function(left, right, worker, cb) {
+export function terminateImpl(left, right, worker, cb) {
   worker.terminate()
     .then(function() {
       cb(right(void 0))();
@@ -157,8 +82,8 @@ exports.terminateImpl = function(left, right, worker, cb) {
     .catch(function(err) {
       cb(left(err))();
     });
-};
+}
 
-exports.threadId = function(worker) {
+export function threadId(worker) {
   return worker.threadId;
-};
+}
diff --git a/src/Node/WorkerBees.purs b/src/Node/WorkerBees.purs
index 91f7013..69dea9d 100644
--- a/src/Node/WorkerBees.purs
+++ b/src/Node/WorkerBees.purs
@@ -4,10 +4,8 @@ module Node.WorkerBees
   , WorkerOptions
   , Worker
   , ThreadId(..)
-  , make
   , makeAsMain
   , unsafeWorkerFromPath
-  , unsafeWorkerFromPathAndExport
   , lift
   , liftReader
   , liftEffect
@@ -65,9 +63,7 @@ foreign import data Worker :: Type -> Type -> Type -> Type
 
 foreign import data WorkerThread :: Type -> Type
 
-foreign import makeImpl :: forall a i o. WorkerConstructor a i o -> Worker a i o
-
-foreign import unsafeMakeImpl :: forall a i o. { filePath :: String, export :: String } -> Worker a i o
+foreign import unsafeMakeImpl :: forall a i o. { filePath :: String } -> Worker a i o
 
 foreign import mainImpl :: forall a i o. WorkerConstructor a i o -> Effect Unit
 
@@ -79,21 +75,22 @@ foreign import terminateImpl :: forall i. EffectFn4 (forall x y. x -> Either x y
 
 foreign import threadId :: forall i. WorkerThread i -> ThreadId
 
--- | Builds a new Worker. Treat this like it's special top-level declaration
--- | syntax. Workers can only be declared at the top-level with `make`, and they
--- | _must_ be exported. Failing to meet these criteria will result in a runtime
--- | exception.
-make :: forall a i o. Sendable o => WorkerConstructor a i o -> Worker a i o
-make = makeImpl
-
+-- | Implements the worker code that can later be called via the
+-- | `unsafeWorkerFromPath` function. This code _must_ be bundled such that
+-- | `main` is actually called in the file.
 makeAsMain :: forall a i o. Sendable o => WorkerConstructor a i o -> Effect Unit
 makeAsMain = mainImpl
 
+-- | Builds a new worker given a path to the compiled code constituting the `main`
+-- | function that should execute in the worker. The worker code should be created
+-- | using `makeAsMain`. The path must be either an absolute path or a relative
+-- | path that begins with ./ or ../
+-- |
+-- | ```purs
+-- | unsafeWorkerFromPath "./output/My.Bundled.Output/index.js"
+-- | ```
 unsafeWorkerFromPath :: forall a i o. Sendable o => String -> Worker a i o
-unsafeWorkerFromPath = unsafeMakeImpl <<< { filePath: _, export: "" }
-
-unsafeWorkerFromPathAndExport :: forall a i o. Sendable o => { filePath :: String, export :: String } -> Worker a i o
-unsafeWorkerFromPathAndExport = unsafeMakeImpl
+unsafeWorkerFromPath = unsafeMakeImpl <<< { filePath: _ }
 
 -- | Instantiates a new worker thread. If this worker subscribes to input, it
 -- | will need to be cleaned up with `terminate`, otherwise it will hold your
diff --git a/src/Node/WorkerBees/Aff.purs b/src/Node/WorkerBees/Aff.purs
index d81b4ee..bc633ad 100644
--- a/src/Node/WorkerBees/Aff.purs
+++ b/src/Node/WorkerBees/Aff.purs
@@ -45,7 +45,7 @@ post :: forall i. Sendable i => i -> WorkerThread i -> Aff Unit
 post i = liftEffect <<< Worker.post i
 
 -- | Terminates the worker thread.
-terminate :: forall i . WorkerThread i -> Aff Unit
+terminate :: forall i. WorkerThread i -> Aff Unit
 terminate worker = invincible $ makeAff \k -> do
   Worker.terminate worker k
   pure mempty
diff --git a/src/Node/WorkerBees/Aff/Pool.purs b/src/Node/WorkerBees/Aff/Pool.purs
index 6f74496..9eb25db 100644
--- a/src/Node/WorkerBees/Aff/Pool.purs
+++ b/src/Node/WorkerBees/Aff/Pool.purs
@@ -63,7 +63,7 @@ terminate (WorkerPool { queue, threads }) = do
   for_ pending (AVar.kill termError <<< snd)
 
 -- | Submits a new input to the worker pool, and waits for the reply.
-invoke :: forall i o . Sendable i => WorkerPool i o -> i -> Aff o
+invoke :: forall i o. Sendable i => WorkerPool i o -> i -> Aff o
 invoke (WorkerPool { queue }) i = do
   res <- AVar.empty
   AVar.put (Tuple i res) queue
diff --git a/test/Main.purs b/test/Main.purs
index 3a7ef2c..acf218f 100644
--- a/test/Main.purs
+++ b/test/Main.purs
@@ -10,11 +10,13 @@ import Node.WorkerBees (Worker)
 import Node.WorkerBees as Worker
 import Node.WorkerBees.Aff.Pool as WorkerPool
 
-worker :: Worker Unit Int String
-worker = Worker.make (Worker.lift show)
-
 main :: Effect Unit
 main = Aff.launchAff_ do
   Console.log "Main..."
-  res <- WorkerPool.poolTraverse worker unit 4 (Array.range 1 100)
+
+  let
+    worker :: Worker Unit Int String
+    worker = Worker.unsafeWorkerFromPath "./output/Test.Worker.js"
+
+  res <- WorkerPool.poolTraverse worker unit 1 (Array.range 1 100)
   Console.logShow res
diff --git a/test/Worker.purs b/test/Worker.purs
new file mode 100644
index 0000000..a719ca6
--- /dev/null
+++ b/test/Worker.purs
@@ -0,0 +1,10 @@
+module Test.Worker where
+
+import Prelude
+
+import Data.Int as Int
+import Effect (Effect)
+import Node.WorkerBees as Worker
+
+main :: Effect Unit
+main = Worker.makeAsMain (Worker.lift (Int.toStringAs Int.decimal))