diff --git a/bin/packages/check-build-type-declaration-files.js b/bin/packages/check-build-type-declaration-files.js
new file mode 100644
index 0000000000000..cd8bad2a70b53
--- /dev/null
+++ b/bin/packages/check-build-type-declaration-files.js
@@ -0,0 +1,121 @@
+/**
+ * This script verifies the published index.d.ts file for every package which both
+ * builds types and also sets checkJs to false in its tsconfig.json. (This scenario
+ * can cause unchecked errors in JS files to be included in the compiled types.)
+ *
+ * We do so by running `tsc --noEmit` on the $package/build-types/index.d.ts file.
+ * This also verifies everything index.d.ts references, so it checks the entire
+ * public api of the type declarations for that package.
+ *
+ * @see https://github.com/WordPress/gutenberg/pull/49650 for more discussion.
+ */
+
+/**
+ * External dependencies
+ */
+const fs = require( 'fs' ).promises;
+const path = require( 'path' );
+const { exec } = require( 'child_process' );
+const chalk = require( 'chalk' );
+
+/**
+ * Returns whether a package needs its compiled types to be double-checked. This
+ * needs to happen when both of these are true:
+ * 1. The package compiles types. (It has a tsconfig file.)
+ * 2. The tsconfig sets checkJs to false.
+ *
+ * NOTE: In the future, if we run into issues parsing JSON, we should migrate to
+ * a proper json5 parser, such as the json5 npm package. The current regex just
+ * handles comments, which at the time is the only thing we use from JSON5.
+ *
+ * @param {string} packagePath Path to the package.
+ * @return {boolean} whether or not the package checksJs.
+ */
+async function packageNeedsExtraCheck( packagePath ) {
+	const configPath = path.join( packagePath, 'tsconfig.json' );
+
+	try {
+		const tsconfigRaw = await fs.readFile( configPath, 'utf-8' );
+		// Removes comments from the JSON5 string to convert it to plain JSON.
+		const jsonString = tsconfigRaw.replace( /\s+\/\/.*$/gm, '' );
+		const config = JSON.parse( jsonString );
+
+		// If checkJs both exists and is false, then we need the extra check.
+		return config.compilerOptions?.checkJs === false;
+	} catch ( e ) {
+		if ( e.code !== 'ENOENT' ) {
+			throw e;
+		}
+
+		// No tsconfig means no checkJs
+		return false;
+	}
+}
+
+// Returns the path to the build-types declaration file for a package if it exists.
+// Throws an error and exits the script otherwise.
+async function getDecFile( packagePath ) {
+	const decFile = path.join( packagePath, 'build-types', 'index.d.ts' );
+	try {
+		await fs.access( decFile );
+		return decFile;
+	} catch ( err ) {
+		console.error(
+			`Cannot access this declaration file. You may need to run tsc again: ${ decFile }`
+		);
+		process.exit( 1 );
+	}
+}
+
+async function typecheckDeclarations( file ) {
+	return new Promise( ( resolve, reject ) => {
+		exec( `npx tsc --noEmit ${ file }`, ( error, stdout, stderr ) => {
+			if ( error ) {
+				reject( { file, error, stderr, stdout } );
+			} else {
+				resolve( { file, stdout } );
+			}
+		} );
+	} );
+}
+
+async function checkUnverifiedDeclarationFiles() {
+	const packageDir = path.resolve( 'packages' );
+	const packageDirs = (
+		await fs.readdir( packageDir, { withFileTypes: true } )
+	 )
+		.filter( ( dirent ) => dirent.isDirectory() )
+		.map( ( dirent ) => path.join( packageDir, dirent.name ) );
+
+	// Finds the compiled type declarations for each package which both checks
+	// types and has checkJs disabled.
+	const declarations = (
+		await Promise.all(
+			packageDirs.map( async ( pkg ) =>
+				( await packageNeedsExtraCheck( pkg ) )
+					? getDecFile( pkg )
+					: null
+			)
+		)
+	 ).filter( Boolean );
+
+	const tscResults = await Promise.allSettled(
+		declarations.map( typecheckDeclarations )
+	);
+
+	tscResults.forEach( ( { status, reason } ) => {
+		if ( status !== 'fulfilled' ) {
+			console.error(
+				chalk.red(
+					`Incorrect published types for ${ reason.file }:\n`
+				),
+				reason.stdout
+			);
+		}
+	} );
+
+	if ( tscResults.some( ( { status } ) => status !== 'fulfilled' ) ) {
+		process.exit( 1 );
+	}
+}
+checkUnverifiedDeclarationFiles();
diff --git a/package-lock.json b/package-lock.json
index 6d804ff79a5d1..851e882622b8b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16810,7 +16810,7 @@
 				"@wordpress/hooks": "file:packages/hooks",
 				"@wordpress/i18n": "file:packages/i18n",
 				"@wordpress/rich-text": "file:packages/rich-text",
-				"rememo": "^4.0.0",
+				"rememo": "^4.0.2",
 				"uuid": "^8.3.0"
 			}
 		},
@@ -16946,7 +16946,7 @@
 				"lodash": "^4.17.21",
 				"react-autosize-textarea": "^7.1.0",
 				"react-easy-crop": "^4.5.1",
-				"rememo": "^4.0.0",
+				"rememo": "^4.0.2",
 				"remove-accents": "^0.4.2",
 				"traverse": "^0.6.6"
 			}
@@ -17034,7 +17034,7 @@
 				"is-plain-object": "^5.0.0",
 				"lodash": "^4.17.21",
 				"memize": "^1.1.0",
-				"rememo": "^4.0.0",
+				"rememo": "^4.0.2",
 				"remove-accents": "^0.4.2",
 				"showdown": "^1.9.1",
 				"simple-html-tokenizer": "^0.5.7",
@@ -17057,7 +17057,7 @@
 				"@wordpress/keyboard-shortcuts": "file:packages/keyboard-shortcuts",
 				"@wordpress/private-apis": "file:packages/private-apis",
 				"cmdk": "^0.2.0",
-				"rememo": "^4.0.0"
+				"rememo": "^4.0.2"
 			}
 		},
 		"@wordpress/components": {
@@ -17165,7 +17165,7 @@
 				"equivalent-key-map": "^0.2.2",
 				"fast-deep-equal": "^3.1.3",
 				"memize": "^1.1.0",
-				"rememo": "^4.0.0",
+				"rememo": "^4.0.2",
 				"uuid": "^8.3.0"
 			}
 		},
@@ -17383,7 +17383,7 @@
 				"@wordpress/widgets": "file:packages/widgets",
 				"classnames": "^2.3.1",
 				"memize": "^1.1.0",
-				"rememo": "^4.0.0"
+				"rememo": "^4.0.2"
 			},
 			"dependencies": {
 				"@wordpress/dom": {
@@ -17459,7 +17459,7 @@
 				"lodash": "^4.17.21",
 				"memize": "^1.1.0",
 				"react-autosize-textarea": "^7.1.0",
-				"rememo": "^4.0.0"
+				"rememo": "^4.0.2"
 			},
 			"dependencies": {
 				"colord": {
@@ -17539,7 +17539,7 @@
 				"lodash": "^4.17.21",
 				"memize": "^1.1.0",
 				"react-autosize-textarea": "^7.1.0",
-				"rememo": "^4.0.0",
+				"rememo": "^4.0.2",
 				"remove-accents": "^0.4.2"
 			},
 			"dependencies": {
@@ -17839,7 +17839,7 @@
 				"@wordpress/data": "file:packages/data",
 				"@wordpress/element": "file:packages/element",
 				"@wordpress/keycodes": "file:packages/keycodes",
-				"rememo": "^4.0.0"
+				"rememo": "^4.0.2"
 			}
 		},
 		"@wordpress/keycodes": {
@@ -18222,7 +18222,7 @@
 				"@wordpress/i18n": "file:packages/i18n",
 				"@wordpress/keycodes": "file:packages/keycodes",
 				"memize": "^1.1.0",
-				"rememo": "^4.0.0"
+				"rememo": "^4.0.2"
 			}
 		},
 		"@wordpress/scripts": {
@@ -50858,9 +50858,9 @@
 			}
 		},
 		"rememo": {
-			"version": "4.0.0",
-			"resolved": "https://registry.npmjs.org/rememo/-/rememo-4.0.0.tgz",
-			"integrity": "sha512-6BAfg1Dqg6UteZBEH9k6EHHersM86/EcBOMtJV+h+xEn1GC3H+gAgJWpexWYAamAxD0qXNmIt50iS/zuZKnQag=="
+			"version": "4.0.2",
+			"resolved": "https://registry.npmjs.org/rememo/-/rememo-4.0.2.tgz",
+			"integrity": "sha512-NVfSP9NstE3QPNs/TnegQY0vnJnstKQSpcrsI2kBTB3dB2PkdfKdTa+abbjMIDqpc63fE5LfjLgfMst0ULMFxQ=="
 		},
 		"remove-accents": {
 			"version": "0.4.2",
diff --git a/package.json b/package.json
index fb6d0a3710ab8..14309c178dea3 100644
--- a/package.json
+++ b/package.json
@@ -251,7 +251,7 @@
 	"scripts": {
 		"build": "npm run build:packages && wp-scripts build",
 		"build:analyze-bundles": "npm run build -- --webpack-bundle-analyzer",
-		"build:package-types": "node ./bin/packages/validate-typescript-version.js && tsc --build",
+		"build:package-types": "node ./bin/packages/validate-typescript-version.js && tsc --build && node ./bin/packages/check-build-type-declaration-files.js",
 		"prebuild:packages": "npm run clean:packages && lerna run build",
 		"build:packages": "npm run build:package-types && node ./bin/packages/build.js",
 		"build:plugin-zip": "bash ./bin/build-plugin-zip.sh",
diff --git a/packages/annotations/package.json b/packages/annotations/package.json
index dcdeaab3180bb..231a66fcaaa5d 100644
--- a/packages/annotations/package.json
+++ b/packages/annotations/package.json
@@ -30,7 +30,7 @@
 		"@wordpress/hooks": "file:../hooks",
 		"@wordpress/i18n": "file:../i18n",
 		"@wordpress/rich-text": "file:../rich-text",
-		"rememo": "^4.0.0",
+		"rememo": "^4.0.2",
 		"uuid": "^8.3.0"
 	},
 	"publishConfig": {
diff --git a/packages/block-editor/package.json b/packages/block-editor/package.json
index bb7e99ca21038..7db45af56aa2b 100644
--- a/packages/block-editor/package.json
+++ b/packages/block-editor/package.json
@@ -72,7 +72,7 @@
 		"lodash": "^4.17.21",
 		"react-autosize-textarea": "^7.1.0",
 		"react-easy-crop": "^4.5.1",
-		"rememo": "^4.0.0",
+		"rememo": "^4.0.2",
 		"remove-accents": "^0.4.2",
 		"traverse": "^0.6.6"
 	},
diff --git a/packages/blocks/package.json b/packages/blocks/package.json
index e0dae87182dc1..ad0e188502362 100644
--- a/packages/blocks/package.json
+++ b/packages/blocks/package.json
@@ -50,7 +50,7 @@
 		"is-plain-object": "^5.0.0",
 		"lodash": "^4.17.21",
 		"memize": "^1.1.0",
-		"rememo": "^4.0.0",
+		"rememo": "^4.0.2",
 		"remove-accents": "^0.4.2",
 		"showdown": "^1.9.1",
 		"simple-html-tokenizer": "^0.5.7",
diff --git a/packages/commands/package.json b/packages/commands/package.json
index 0ba9afd4807c8..0d5cc0d81fa4d 100644
--- a/packages/commands/package.json
+++ b/packages/commands/package.json
@@ -35,7 +35,7 @@
 		"@wordpress/keyboard-shortcuts": "file:../keyboard-shortcuts",
 		"@wordpress/private-apis": "file:../private-apis",
 		"cmdk": "^0.2.0",
-		"rememo": "^4.0.0"
+		"rememo": "^4.0.2"
 	},
 	"peerDependencies": {
 		"react": "^18.0.0"
diff --git a/packages/core-data/package.json b/packages/core-data/package.json
index 8ed5b7790c96b..34f0a19ee81f9 100644
--- a/packages/core-data/package.json
+++ b/packages/core-data/package.json
@@ -45,7 +45,7 @@
 		"equivalent-key-map": "^0.2.2",
 		"fast-deep-equal": "^3.1.3",
 		"memize": "^1.1.0",
-		"rememo": "^4.0.0",
+		"rememo": "^4.0.2",
 		"uuid": "^8.3.0"
 	},
 	"peerDependencies": {
diff --git a/packages/edit-post/package.json b/packages/edit-post/package.json
index d774dd50b0b9b..ed2e70633451b 100644
--- a/packages/edit-post/package.json
+++ b/packages/edit-post/package.json
@@ -57,7 +57,7 @@
 		"@wordpress/widgets": "file:../widgets",
 		"classnames": "^2.3.1",
 		"memize": "^1.1.0",
-		"rememo": "^4.0.0"
+		"rememo": "^4.0.2"
 	},
 	"peerDependencies": {
 		"react": "^18.0.0",
diff --git a/packages/edit-site/package.json b/packages/edit-site/package.json
index 463eceff350ff..db4d51782f93f 100644
--- a/packages/edit-site/package.json
+++ b/packages/edit-site/package.json
@@ -66,7 +66,7 @@
 		"lodash": "^4.17.21",
 		"memize": "^1.1.0",
 		"react-autosize-textarea": "^7.1.0",
-		"rememo": "^4.0.0"
+		"rememo": "^4.0.2"
 	},
 	"peerDependencies": {
 		"react": "^18.0.0",
diff --git a/packages/editor/package.json b/packages/editor/package.json
index c5769be6d1720..68adcde0398c9 100644
--- a/packages/editor/package.json
+++ b/packages/editor/package.json
@@ -65,7 +65,7 @@
 		"lodash": "^4.17.21",
 		"memize": "^1.1.0",
 		"react-autosize-textarea": "^7.1.0",
-		"rememo": "^4.0.0",
+		"rememo": "^4.0.2",
 		"remove-accents": "^0.4.2"
 	},
 	"peerDependencies": {
diff --git a/packages/keyboard-shortcuts/package.json b/packages/keyboard-shortcuts/package.json
index df206934ffaaf..e06c0e637e932 100644
--- a/packages/keyboard-shortcuts/package.json
+++ b/packages/keyboard-shortcuts/package.json
@@ -29,7 +29,7 @@
 		"@wordpress/data": "file:../data",
 		"@wordpress/element": "file:../element",
 		"@wordpress/keycodes": "file:../keycodes",
-		"rememo": "^4.0.0"
+		"rememo": "^4.0.2"
 	},
 	"peerDependencies": {
 		"react": "^18.0.0"
diff --git a/packages/react-native-editor/jest_ui.config.js b/packages/react-native-editor/jest_ui.config.js
index 6998b3b98dc00..43dc5519ee869 100644
--- a/packages/react-native-editor/jest_ui.config.js
+++ b/packages/react-native-editor/jest_ui.config.js
@@ -16,7 +16,7 @@ module.exports = {
 		platforms: [ 'android', 'ios', 'native' ],
 	},
 	transform: {
-		'^.+\\.(js|ts|tsx)$': 'babel-jest',
+		'^.+\\.(js|ts|tsx|cjs)$': 'babel-jest',
 	},
 	setupFilesAfterEnv: [ './jest_ui_setup_after_env.js' ],
 	testEnvironment: './jest_ui_test_environment.js',
diff --git a/packages/react-native-editor/metro.config.js b/packages/react-native-editor/metro.config.js
index 73bc29c15d1b1..05e57e3cfbcab 100644
--- a/packages/react-native-editor/metro.config.js
+++ b/packages/react-native-editor/metro.config.js
@@ -13,7 +13,7 @@ const packageNames = fs.readdirSync( PACKAGES_DIR ).filter( ( file ) => {
 module.exports = {
 	watchFolders: [ path.resolve( __dirname, '../..' ) ],
 	resolver: {
-		sourceExts: [ 'js', 'json', 'scss', 'sass', 'ts', 'tsx' ],
+		sourceExts: [ 'js', 'cjs', 'json', 'scss', 'sass', 'ts', 'tsx' ],
 		platforms: [ 'native', 'android', 'ios' ],
 	},
 	transformer: {
diff --git a/packages/rich-text/package.json b/packages/rich-text/package.json
index 5e7867baeafce..e986aaf7365ed 100644
--- a/packages/rich-text/package.json
+++ b/packages/rich-text/package.json
@@ -39,7 +39,7 @@
 		"@wordpress/i18n": "file:../i18n",
 		"@wordpress/keycodes": "file:../keycodes",
 		"memize": "^1.1.0",
-		"rememo": "^4.0.0"
+		"rememo": "^4.0.2"
 	},
 	"peerDependencies": {
 		"react": "^18.0.0"