3 files changed, 19 insertions, 19 deletions
diff --git a/packages/dev-utils/README.md b/packages/dev-utils/README.md
index 2b183f1c7..1c3bd3a3f 100644
--- a/packages/dev-utils/README.md
+++ b/packages/dev-utils/README.md
@@ -49,28 +49,16 @@ yarn install
 
 ### Build
 
-If this is your **first** time building this package, you must first build **all** packages within the monorepo. This is because packages that depend on other packages located inside this monorepo are symlinked when run from **within** the monorepo. This allows you to make changes across multiple packages without first publishing dependent packages to NPM. To build all packages, run the following from the monorepo root directory:
+To build this package and all other monorepo packages that it depends on, run the following from the monorepo root directory:
 
 ```bash
-yarn lerna:rebuild
+PKG=@0xproject/dev-utils yarn build
 ```
 
 Or continuously rebuild on change:
 
 ```bash
-yarn dev
-```
-
-You can also build this specific package by running the following from within its directory:
-
-```bash
-yarn build
-```
-
-or continuously rebuild on change:
-
-```bash
-yarn build:watch
+PKG=@0xproject/dev-utils yarn watch
 ```
 
 ### Clean
diff --git a/packages/dev-utils/package.json b/packages/dev-utils/package.json
index 67b448024..93edd80ca 100644
--- a/packages/dev-utils/package.json
+++ b/packages/dev-utils/package.json
@@ -1,11 +1,14 @@
 {
     "name": "@0xproject/dev-utils",
     "version": "0.4.1",
+    "engines": {
+        "node" : ">=6.12"
+    },
     "description": "0x dev TS utils",
     "main": "lib/src/index.js",
     "types": "lib/src/index.d.ts",
     "scripts": {
-        "build:watch": "tsc -w",
+        "watch": "tsc -w",
         "build": "tsc && copyfiles -u 3 './lib/src/monorepo_scripts/**/*' ./scripts",
         "test": "run-s clean build run_mocha",
         "test:circleci": "yarn test:coverage",
diff --git a/packages/dev-utils/src/callback_error_reporter.ts b/packages/dev-utils/src/callback_error_reporter.ts
index c8e693673..8432bb5d4 100644
--- a/packages/dev-utils/src/callback_error_reporter.ts
+++ b/packages/dev-utils/src/callback_error_reporter.ts
@@ -6,7 +6,10 @@ import { DoneCallback } from '@0xproject/types';
 const expect = chai.expect;
 
 export const callbackErrorReporter = {
-    reportNoErrorCallbackErrors(done: DoneCallback, expectToBeCalledOnce = true) {
+    reportNoErrorCallbackErrors(
+        done: DoneCallback,
+        expectToBeCalledOnce: boolean = true,
+    ): <T>(f?: ((value: T) => void) | undefined) => (value: T) => void {
         const callback = <T>(f?: (value: T) => void) => {
             const wrapped = (value: T) => {
                 if (_.isUndefined(f)) {
@@ -26,7 +29,10 @@ export const callbackErrorReporter = {
         };
         return callback;
     },
-    reportNodeCallbackErrors(done: DoneCallback, expectToBeCalledOnce = true) {
+    reportNodeCallbackErrors(
+        done: DoneCallback,
+        expectToBeCalledOnce: boolean = true,
+    ): <T>(f?: ((value: T) => void) | undefined) => (error: Error | null, value: T | undefined) => void {
         const callback = <T>(f?: (value: T) => void) => {
             const wrapped = (error: Error | null, value: T | undefined) => {
                 if (!_.isNull(error)) {
@@ -50,7 +56,10 @@ export const callbackErrorReporter = {
         };
         return callback;
     },
-    assertNodeCallbackError(done: DoneCallback, errMsg: string) {
+    assertNodeCallbackError(
+        done: DoneCallback,
+        errMsg: string,
+    ): <T>(error: Error | null, value: T | undefined) => void {
         const wrapped = <T>(error: Error | null, value: T | undefined) => {
             if (_.isNull(error)) {
                 done(new Error('Expected callback to receive an error'));