diff --git a/docs/tool/manifest.js b/docs/tool/manifest.js
index 56f7a2c8772c4..f21130e448e11 100644
--- a/docs/tool/manifest.js
+++ b/docs/tool/manifest.js
@@ -70,7 +70,7 @@ function getRootManifest( tocFileName ) {
 
 function generateRootManifestFromTOCItems( items, parent = null ) {
 	let pageItems = [];
-	items.map( ( obj ) => {
+	items.forEach( ( obj ) => {
 		const fileName = Object.keys( obj )[ 0 ];
 		const children = obj[ fileName ];
 
diff --git a/packages/block-library/src/file/index.js b/packages/block-library/src/file/index.js
index 1c7087039a5cc..9ce871bcfa277 100644
--- a/packages/block-library/src/file/index.js
+++ b/packages/block-library/src/file/index.js
@@ -86,7 +86,7 @@ export const settings = {
 				transform: ( files ) => {
 					const blocks = [];
 
-					files.map( ( file ) => {
+					files.forEach( ( file ) => {
 						const blobURL = createBlobURL( file );
 
 						// File will be uploaded in componentDidMount()
diff --git a/packages/edit-post/src/hooks/components/media-upload/index.js b/packages/edit-post/src/hooks/components/media-upload/index.js
index 0b4fe40ce4ea9..bcf4d49d700c5 100644
--- a/packages/edit-post/src/hooks/components/media-upload/index.js
+++ b/packages/edit-post/src/hooks/components/media-upload/index.js
@@ -172,7 +172,7 @@ class MediaUpload extends Component {
 		}
 		if ( ! this.props.gallery ) {
 			const selection = this.frame.state().get( 'selection' );
-			castArray( this.props.value ).map( ( id ) => {
+			castArray( this.props.value ).forEach( ( id ) => {
 				selection.add( wp.media.attachment( id ) );
 			} );
 		}
diff --git a/packages/eslint-plugin/CHANGELOG.md b/packages/eslint-plugin/CHANGELOG.md
index 4e3f6f8430996..0d563005b9613 100644
--- a/packages/eslint-plugin/CHANGELOG.md
+++ b/packages/eslint-plugin/CHANGELOG.md
@@ -3,6 +3,7 @@
 ### Breaking Changes
 
 - The `esnext` and `recommended` rulesets now enforce [`object-shorthand`](https://eslint.org/docs/rules/object-shorthand)
+- The `es5` and `recommended` rulesets now enforce [`array-callback-return`](https://eslint.org/docs/rules/array-callback-return)
 
 ### New Features
 
diff --git a/packages/eslint-plugin/configs/es5.js b/packages/eslint-plugin/configs/es5.js
index 167e542ef69a6..a13168d1223e0 100644
--- a/packages/eslint-plugin/configs/es5.js
+++ b/packages/eslint-plugin/configs/es5.js
@@ -1,6 +1,7 @@
 module.exports = {
 	rules: {
 		'array-bracket-spacing': [ 'error', 'always' ],
+		'array-callback-return': 'error',
 		'brace-style': [ 'error', '1tbs' ],
 		camelcase: [ 'error', {
 			properties: 'never',
diff --git a/packages/scripts/scripts/check-licenses.js b/packages/scripts/scripts/check-licenses.js
index 2120d0cbfe75e..2bc95d51e0913 100644
--- a/packages/scripts/scripts/check-licenses.js
+++ b/packages/scripts/scripts/check-licenses.js
@@ -258,6 +258,7 @@ modules.forEach( ( path ) => {
 					}, stringDetectedType );
 				}, detectedType );
 			}
+			return detectedType;
 		}, false );
 	}