diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
new file mode 100644
index 0000000..a0074fd
--- /dev/null
+++ b/.github/workflows/nodejs.yml
@@ -0,0 +1,30 @@
+name: build
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [8.x, 10.x, 12.x]
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - name: npm install, build, and test
+      run: |
+        npm install
+        npm ci
+        npm run build --if-present
+        npm test
+        npm run coverage
+        npm run coveralls
+      env:
+        CI: true
+        COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index af258a7..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,5 +0,0 @@
-language: node_js
-node_js:
-  - '0.10'
-after_script:
-  - npm run coveralls
diff --git a/README.md b/README.md
index fbd3eb2..360be94 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # Teep
 
-[![Build Status](https://travis-ci.org/earldouglas/teep.svg?branch=master)](https://travis-ci.org/earldouglas/teep)
-[![Coverage Status](https://coveralls.io/repos/earldouglas/teep/badge.svg?branch=master&service=github)](https://coveralls.io/github/earldouglas/teep?branch=master)
+![Build Status](https://github.com/earldouglas/teep/workflows/build/badge.svg)
+[![Coverage Status](https://coveralls.io/repos/earldouglas/teep/badge.svg)](https://coveralls.io/github/earldouglas/teep)
 
 Teep is a JavaScript library for functional programming.  It works both
 as a [Node.js module](https://www.npmjs.org/package/teep), and directly
diff --git a/package.json b/package.json
index 33c36cb..9d11c8c 100644
--- a/package.json
+++ b/package.json
@@ -22,13 +22,23 @@
   },
   "scripts": {
     "build": "tsc src/teep.ts --outDir .",
-    "test": "npm run-script build && istanbul cover _mocha -- -R spec",
-    "coveralls": "npm run-script test && cat ./coverage/lcov.info | coveralls"
+    "test": "jshint . --exclude node_modules && mocha",
+    "coverage": "istanbul cover _mocha -- -R spec",
+    "coveralls": "cat ./coverage/lcov.info | coveralls"
+  },
+  "jshintConfig": {
+    "node": true,
+    "globals": {
+      "Promise": false,
+      "describe": false,
+      "it": false
+    }
   },
   "devDependencies": {
     "bluebird": "2.2.2",
     "coveralls": "2.11.2",
     "istanbul": "0.3.5",
+    "jshint": "2.9.4",
     "mocha": "2.2.5",
     "mocha-lcov-reporter": "0.0.1",
     "typescript": "2.9"
diff --git a/src/teep.ts b/src/teep.ts
index 5b62ca9..2fb5200 100644
--- a/src/teep.ts
+++ b/src/teep.ts
@@ -51,7 +51,9 @@ module edc {
     keys: (o: Object): Array<any> => {
       var ks = [];
       for (var k in o) {
-        !o.hasOwnProperty(k) || ks.push(k);
+        if (o.hasOwnProperty(k)) {
+	  ks.push(k);
+	}
       }
       return ks;
     },
@@ -336,17 +338,17 @@ module edc {
     }
     apply(a: A): B {
       return this.f(a);
-    };
+    }
     map<C>(g: (B) => C): Reader<A,C> {
       return new Reader((a) => {
         return g(this.f(a));
       });
-    };
+    }
     flatMap<C>(g: (B) => Reader<A,C>): Reader<A,C> {
       return new Reader((a) => {
         return g(this.f(a)).apply(a);
       });
-    };
+    }
   }
 
   var reader = <A,B>(f: (A) => B) => { return new Reader(f); }
@@ -362,21 +364,21 @@ module edc {
     }
     apply(k: (A) => any): void {
       this.f(k);
-    };
+    }
     map<B>(g: (A) => B): Future<B> {
       return new Future((k: (B) => any) => {
         return this.f((a: A) => {
           k(g(a));
         });
       });
-    };
+    }
     flatMap<B>(g: (A) => Future<B>): Future<B> {
       return new Future((k: (B) => any) => {
         return this.f((a: A) => {
           g(a).apply(k);
         });
       });
-    };
+    }
     sequence<B>(f2: Future<B>): Future<(A) => B> {
       var a: A;
       var b: B;
@@ -395,7 +397,7 @@ module edc {
           kk();
         });
       });
-    };
+    }
   }
 
   var future = <A>(f: (A) => any) => { return new Future(f); }
@@ -407,17 +409,17 @@ module edc {
     }
     apply(a: A): Monad<B> {
       return this.f(a);
-    };
+    }
     map<C>(g: (B) => C): ReaderT<A,C> {
       return new ReaderT((a) => {
         return this.f(a).map(g);
       });
-    };
+    }
     flatMap<C>(g: (B) => ReaderT<A,C>): ReaderT<A,C> {
       return new ReaderT((a) => {
         return this.f(a).map(g).flatMap((r) => { return r.apply(a); });
       });
-    };
+    }
   }
 
   var readerT = <A,B>(f: (A) => Monad<B>) => { return new ReaderT(f); }
@@ -440,20 +442,20 @@ module edc {
     }
     apply(s: S): StateTuple<S,A> {
       return this.f(s);
-    };
+    }
     map<B>(g: (A) => B): State<S,B> {
       return state((s: S) => {
         var sa: StateTuple<S,A> = this.f(s);
         return new StateTuple(sa.state, g(sa.value));
       });
-    };
+    }
     flatMap<B>(g: (A) => State<S,B>): State<S,B> {
       return state((s: S) => {
         var sa: StateTuple<S,A> = this.f(s);
         var sb: State<S,B> = g(sa.value);
         return sb.apply(sa.state);
       });
-    };
+    }
   }
 
   export var teep = {
@@ -478,6 +480,8 @@ module edc {
     });
   };
 
-  !exports || setExports();
+  if (exports) {
+    setExports();
+  }
 
 }
diff --git a/teep.js b/teep.js
index 0bddd5d..0ed717c 100644
--- a/teep.js
+++ b/teep.js
@@ -48,7 +48,9 @@ var edc;
         keys: function (o) {
             var ks = [];
             for (var k in o) {
-                !o.hasOwnProperty(k) || ks.push(k);
+                if (o.hasOwnProperty(k)) {
+                    ks.push(k);
+                }
             }
             return ks;
         }
@@ -287,21 +289,18 @@ var edc;
         Reader.prototype.apply = function (a) {
             return this.f(a);
         };
-        ;
         Reader.prototype.map = function (g) {
             var _this = this;
             return new Reader(function (a) {
                 return g(_this.f(a));
             });
         };
-        ;
         Reader.prototype.flatMap = function (g) {
             var _this = this;
             return new Reader(function (a) {
                 return g(_this.f(a)).apply(a);
             });
         };
-        ;
         return Reader;
     }());
     var reader = function (f) { return new Reader(f); };
@@ -315,7 +314,6 @@ var edc;
         Future.prototype.apply = function (k) {
             this.f(k);
         };
-        ;
         Future.prototype.map = function (g) {
             var _this = this;
             return new Future(function (k) {
@@ -324,7 +322,6 @@ var edc;
                 });
             });
         };
-        ;
         Future.prototype.flatMap = function (g) {
             var _this = this;
             return new Future(function (k) {
@@ -333,7 +330,6 @@ var edc;
                 });
             });
         };
-        ;
         Future.prototype.sequence = function (f2) {
             var _this = this;
             var a;
@@ -354,7 +350,6 @@ var edc;
                 });
             });
         };
-        ;
         return Future;
     }());
     var future = function (f) { return new Future(f); };
@@ -365,21 +360,18 @@ var edc;
         ReaderT.prototype.apply = function (a) {
             return this.f(a);
         };
-        ;
         ReaderT.prototype.map = function (g) {
             var _this = this;
             return new ReaderT(function (a) {
                 return _this.f(a).map(g);
             });
         };
-        ;
         ReaderT.prototype.flatMap = function (g) {
             var _this = this;
             return new ReaderT(function (a) {
                 return _this.f(a).map(g).flatMap(function (r) { return r.apply(a); });
             });
         };
-        ;
         return ReaderT;
     }());
     var readerT = function (f) { return new ReaderT(f); };
@@ -398,7 +390,6 @@ var edc;
         State.prototype.apply = function (s) {
             return this.f(s);
         };
-        ;
         State.prototype.map = function (g) {
             var _this = this;
             return state(function (s) {
@@ -406,7 +397,6 @@ var edc;
                 return new StateTuple(sa.state, g(sa.value));
             });
         };
-        ;
         State.prototype.flatMap = function (g) {
             var _this = this;
             return state(function (s) {
@@ -415,7 +405,6 @@ var edc;
                 return sb.apply(sa.state);
             });
         };
-        ;
         return State;
     }());
     edc.teep = {
@@ -438,5 +427,7 @@ var edc;
             exports[k] = edc.teep[k];
         });
     };
-    !exports || setExports();
+    if (exports) {
+        setExports();
+    }
 })(edc || (edc = {}));
diff --git a/test/examples.js b/test/examples.js
index 730ccf1..1ddcce6 100644
--- a/test/examples.js
+++ b/test/examples.js
@@ -2,7 +2,7 @@
 
 if (!global.Promise) { global.Promise = require('bluebird'); }
 
-var assert = require("assert")
+var assert = require("assert");
 var teep = require('../teep.js');
 
 describe('examples', function () {
@@ -496,7 +496,7 @@ describe('examples', function () {
           return k(db.answer + x);
         });
       });
-    };
+    }
 
     function verify(x, done) {
       return function (y) {
@@ -504,7 +504,7 @@ describe('examples', function () {
           done();
         }
       };
-    };
+    }
 
     it('apply', function (done) {
       teep.readerT(getAnswer).apply(db).apply(verify(42, done));