diff --git a/js/common/mipmapDownscale.ts b/js/common/mipmapDownscale.ts
index 190b9c81..c16ba7ac 100644
--- a/js/common/mipmapDownscale.ts
+++ b/js/common/mipmapDownscale.ts
@@ -1,8 +1,6 @@
 // Copyright 2015-2024, University of Colorado Boulder
 
 
-import IntentionalAny from '../../../phet-core/js/types/IntentionalAny.js';
-
 type MipMap = {
   data: Buffer;
   width: number;
@@ -25,7 +23,7 @@ type MipMap = {
  *
  * @author Jonathan Olson <jonathan.olson@colorado.edu>
  */
-function mipmapDownscale( mipmap: MipMap, createData: ( width: number, height: number ) => Buffer ): { data: IntentionalAny; width: number; height: number } {
+function mipmapDownscale( mipmap: MipMap, createData: ( width: number, height: number ) => Buffer ): { data: Buffer; width: number; height: number } {
   // array index constants for the channels
   const R = 0;
   const G = 1;
diff --git a/js/grunt/copySupplementalPhetioFiles.ts b/js/grunt/copySupplementalPhetioFiles.ts
index 5fbebe1c..2f50a81d 100644
--- a/js/grunt/copySupplementalPhetioFiles.ts
+++ b/js/grunt/copySupplementalPhetioFiles.ts
@@ -12,6 +12,7 @@ import assert from 'assert';
 import fs from 'fs';
 import _ from 'lodash';
 import path from 'path';
+import { Stats } from 'webpack';
 import SimVersion from '../../../perennial-alias/js/browser-and-node/SimVersion.js';
 import dirname from '../../../perennial-alias/js/common/dirname.js';
 import execute from '../../../perennial-alias/js/common/execute.js';
@@ -482,7 +483,7 @@ const handleOfflineArtifact = async ( buildDir: string, repo: string, version: s
   const output = fs.createWriteStream( `${buildDir}${repo}-phet-io-${version}.zip` );
   const archive = archiver( 'zip' );
 
-  archive.on( 'error', ( err: IntentionalAny ) => grunt.fail.fatal( `error creating archive: ${err}` ) );
+  archive.on( 'error', ( err: unknown ) => grunt.fail.fatal( `error creating archive: ${err}` ) );
 
   archive.pipe( output );
 
@@ -717,7 +718,7 @@ const getCompiledMigrationProcessors = async ( repo: string, buildDir: string ):
         }
       } );
 
-      compiler.run( ( err: Error, stats: IntentionalAny ) => {
+      compiler.run( ( err: Error, stats: Stats ) => {
         if ( err || stats.hasErrors() ) {
           console.error( 'Migration processors webpack build errors:', stats.compilation.errors );
           reject( err || stats.compilation.errors[ 0 ] );
diff --git a/js/grunt/webpackBuild.ts b/js/grunt/webpackBuild.ts
index e341cfa2..b50848d5 100644
--- a/js/grunt/webpackBuild.ts
+++ b/js/grunt/webpackBuild.ts
@@ -14,6 +14,7 @@ import dirname from '../../../perennial-alias/js/common/dirname.js';
 import IntentionalAny from '../../../phet-core/js/types/IntentionalAny.js';
 import ChipperConstants from '../common/ChipperConstants.js';
 import webpackGlobalLibraries from '../common/webpackGlobalLibraries.js';
+import { Stats } from 'webpack';
 
 const webpack = require( 'webpack' );
 
@@ -163,7 +164,7 @@ const webpackBuild = function webpackBuild( repo: string, brand: string, provide
       ]
     } );
 
-    compiler.run( ( err: Error, stats: IntentionalAny ) => {
+    compiler.run( ( err: Error, stats: Stats ) => {
       if ( err || stats.hasErrors() ) {
         console.error( 'Webpack build errors:', stats.compilation.errors );
         reject( err || stats.compilation.errors[ 0 ] );
diff --git a/js/phet-io/formatPhetioAPI.ts b/js/phet-io/formatPhetioAPI.ts
index 940c2dbb..0cd64883 100644
--- a/js/phet-io/formatPhetioAPI.ts
+++ b/js/phet-io/formatPhetioAPI.ts
@@ -18,7 +18,7 @@ import IntentionalAny from '../../../phet-core/js/types/IntentionalAny.js';
  * Creates a new object, recursively, by sorting the keys at each level.
  * @param unordered - jsonifiable object to be sorted by key name.  Sorting is recursive.
  */
-const copyWithSortedKeys = ( unordered: IntentionalAny ): Record<string, IntentionalAny> => {
+const copyWithSortedKeys = ( unordered: Record<string, IntentionalAny> ): Record<string, IntentionalAny> => {
   if ( Array.isArray( unordered ) ) {
     return unordered.map( copyWithSortedKeys );
   }
@@ -34,7 +34,7 @@ const copyWithSortedKeys = ( unordered: IntentionalAny ): Record<string, Intenti
   return ordered;
 };
 
-export default ( api: IntentionalAny ): string => {
+export default ( api: object ): string => {
   assert( api, 'api expected' );
   const objectString = JSON.stringify( copyWithSortedKeys( api ), null, 2 );
   return fixEOL( objectString );