diff --git a/.eslintrc.js b/.eslintrc.js
index 5b4dbd01..24bc9c33 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -16,11 +16,13 @@ module.exports = {
   plugins: ['babel', 'flowtype', 'import', 'prettier'],
   parser: 'babel-eslint',
   rules: {
+    'consistent-return': 'error',
     'import/no-extraneous-dependencies': 'error',
     'lint/extra-arrow-initializer': 'off',
     'max-len': 'off',
-    'no-alert': 'off',
-    'no-console-disallow': 'off',
+    'no-alert': 'error',
+    'no-console': 'error',
+    'no-unused-vars': 'error',
     'no-var': 'off',
     'prefer-arrow-callback': 'off',
     'prefer-const': ['warn', {destructuring: 'all'}],
diff --git a/packages/metro-memory-fs/src/__tests__/index-test.js b/packages/metro-memory-fs/src/__tests__/index-test.js
index 6ab9153d..0d357108 100644
--- a/packages/metro-memory-fs/src/__tests__/index-test.js
+++ b/packages/metro-memory-fs/src/__tests__/index-test.js
@@ -38,11 +38,13 @@ it('works without binding functions', () => {
 it('can write then read a file (async)', done => {
   fs.writeFile('/foo.txt', 'test', wrError => {
     if (wrError) {
-      return done(wrError);
+      done(wrError);
+      return;
     }
     fs.readFile('/foo.txt', 'utf8', (rdError, str) => {
       if (rdError) {
-        return done(rdError);
+        done(rdError);
+        return;
       }
       expect(str).toEqual('test');
       done();
@@ -57,8 +59,9 @@ it('can write then read a file as buffer', () => {
 
 it('can write a file with a stream', done => {
   const st = fs.createWriteStream('/foo.txt');
-  let opened = false,
-    closed = false;
+  let opened = false;
+  let closed = false;
+
   st.on('open', () => (opened = true));
   st.on('close', () => (closed = true));
   st.write('test');
@@ -73,8 +76,9 @@ it('can write a file with a stream', done => {
 
 it('can write a file with a stream, as buffer', done => {
   const st = fs.createWriteStream('/foo.txt');
-  let opened = false,
-    closed = false;
+  let opened = false;
+  let closed = false;
+
   st.on('open', () => (opened = true));
   st.on('close', () => (closed = true));
   st.write(Buffer.from('test'));
@@ -90,8 +94,9 @@ it('can write a file with a stream, as buffer', done => {
 it('can write a file with a stream, with a starting position', done => {
   fs.writeFileSync('/foo.txt', 'test bar');
   const st = fs.createWriteStream('/foo.txt', {start: 5, flags: 'r+'});
-  let opened = false,
-    closed = false;
+  let opened = false;
+  let closed = false;
+
   st.on('open', () => (opened = true));
   st.on('close', () => (closed = true));
   st.write('beep');
@@ -217,7 +222,8 @@ it('throws when trying to read a directory entry', () => {
 it('throws when trying to read inexistent file (async)', done => {
   fs.readFile('/foo.txt', error => {
     if (error.code !== 'ENOENT') {
-      return done(error);
+      done(error);
+      return;
     }
     expect(error.message).toMatchSnapshot();
     done();
diff --git a/scripts/watch.js b/scripts/watch.js
index bd952b6b..ad81125d 100644
--- a/scripts/watch.js
+++ b/scripts/watch.js
@@ -39,6 +39,7 @@ getPackages().forEach(p => {
       const filePath = path.resolve(srcDir, filename);
 
       if ((event === 'change' || event === 'rename') && exists(filePath)) {
+        // eslint-disable-next-line no-console
         console.log(chalk.green('->'), `${event}: ${filename}`);
         rebuild(filePath);
       } else {
@@ -69,4 +70,5 @@ setInterval(() => {
   }
 }, 100);
 
+// eslint-disable-next-line no-console
 console.log(chalk.red('->'), chalk.cyan('Watching for changes...'));