diff --git a/common/web/types/src/keyman-touch-layout/keyman-touch-layout-file-reader.ts b/common/web/types/src/keyman-touch-layout/keyman-touch-layout-file-reader.ts
index eb54325424..f4c5e757bf 100644
--- a/common/web/types/src/keyman-touch-layout/keyman-touch-layout-file-reader.ts
+++ b/common/web/types/src/keyman-touch-layout/keyman-touch-layout-file-reader.ts
@@ -1,4 +1,5 @@
-import Ajv from "ajv";
+import { default as AjvModule } from 'ajv';
+const Ajv = AjvModule.default; // The actual expected Ajv type.
 import { TouchLayoutFile } from "./keyman-touch-layout-file.js";
 
 export class TouchLayoutFileReader {
diff --git a/common/web/types/src/kpj/kpj-file-reader.ts b/common/web/types/src/kpj/kpj-file-reader.ts
index 121207acb9..f8d27c6a70 100644
--- a/common/web/types/src/kpj/kpj-file-reader.ts
+++ b/common/web/types/src/kpj/kpj-file-reader.ts
@@ -1,6 +1,7 @@
 import * as xml2js from 'xml2js';
 import { KPJFile, KPJFileProject } from './kpj-file.js';
-import Ajv from 'ajv';
+import { default as AjvModule } from 'ajv';
+const Ajv = AjvModule.default; // The actual expected Ajv type.
 import { boxXmlArray } from '../util/util.js';
 import { KeymanDeveloperProject, KeymanDeveloperProjectFile10, KeymanDeveloperProjectType } from './keyman-developer-project.js';
 
diff --git a/common/web/types/src/kvk/kvks-file-reader.ts b/common/web/types/src/kvk/kvks-file-reader.ts
index c6a696cf30..1a4c5a8b05 100644
--- a/common/web/types/src/kvk/kvks-file-reader.ts
+++ b/common/web/types/src/kvk/kvks-file-reader.ts
@@ -1,6 +1,7 @@
 import * as xml2js from 'xml2js';
 import KVKSourceFile from './kvks-file.js';
-import Ajv from 'ajv';
+import { default as AjvModule } from 'ajv';
+const Ajv = AjvModule.default; // The actual expected Ajv type.
 import { boxXmlArray } from '../util/util.js';
 import { VisualKeyboard, VisualKeyboardHeaderFlags, VisualKeyboardKey, VisualKeyboardKeyFlags, VisualKeyboardLegalShiftStates, VisualKeyboardShiftState } from './visual-keyboard.js';
 import { USVirtualKeyCodes } from '../consts/virtual-key-constants.js';
diff --git a/common/web/types/src/kvk/visual-keyboard.ts b/common/web/types/src/kvk/visual-keyboard.ts
index 11e9df977d..c1f1d5d7e9 100644
--- a/common/web/types/src/kvk/visual-keyboard.ts
+++ b/common/web/types/src/kvk/visual-keyboard.ts
@@ -4,14 +4,14 @@
 // Corresponds to .kvk / .kvks file data
 //
 
-import { BUILDER_KVK_SHIFT_STATE, BUILDER_KVK_HEADER_FLAGS, BUILDER_KVK_KEY_FLAGS } from "./kvk-file";
+import { BUILDER_KVK_SHIFT_STATE, BUILDER_KVK_HEADER_FLAGS, BUILDER_KVK_KEY_FLAGS } from "./kvk-file.js";
 
 export class VisualKeyboard {
   header: VisualKeyboardHeader = {flags: 0, ansiFont:{}, unicodeFont:{}, underlyingLayout: undefined};
   keys: VisualKeyboardKey[] = [];
 };
 
-export { BUILDER_KVK_HEADER_FLAGS as VisualKeyboardHeaderFlags } from "./kvk-file";
+export { BUILDER_KVK_HEADER_FLAGS as VisualKeyboardHeaderFlags } from "./kvk-file.js";
 
 export class VisualKeyboardHeader {
   version?: number;                      // 0x0600
diff --git a/common/web/types/src/ldml-keyboard/ldml-keyboard-xml-reader.ts b/common/web/types/src/ldml-keyboard/ldml-keyboard-xml-reader.ts
index 7172edbd70..ac470f8589 100644
--- a/common/web/types/src/ldml-keyboard/ldml-keyboard-xml-reader.ts
+++ b/common/web/types/src/ldml-keyboard/ldml-keyboard-xml-reader.ts
@@ -1,6 +1,7 @@
 import * as xml2js from 'xml2js';
 import { LDMLKeyboardXMLSourceFile, LKImport } from './ldml-keyboard-xml.js';
-import Ajv from 'ajv';
+import { default as AjvModule } from 'ajv';
+const Ajv = AjvModule.default; // The actual expected Ajv type.
 import { boxXmlArray } from '../util/util.js';
 import { CompilerCallbacks } from '../util/compiler-interfaces.js';
 import { constants } from '@keymanapp/ldml-keyboard-constants';
diff --git a/common/web/types/src/main.ts b/common/web/types/src/main.ts
index 72cf77c48e..f3d20402e7 100644
--- a/common/web/types/src/main.ts
+++ b/common/web/types/src/main.ts
@@ -10,7 +10,7 @@ export { default as KvksFileReader } from './kvk/kvks-file-reader.js';
 export { default as KvkFileWriter } from './kvk/kvk-file-writer.js';
 
 export * as LDMLKeyboard from './ldml-keyboard/ldml-keyboard-xml.js';
-export { LDMLKeyboardTestDataXMLSourceFile } from './ldml-keyboard/ldml-keyboard-testdata-xml';
+export { LDMLKeyboardTestDataXMLSourceFile } from './ldml-keyboard/ldml-keyboard-testdata-xml.js';
 export { default as LDMLKeyboardXMLSourceFileReader } from './ldml-keyboard/ldml-keyboard-xml-reader.js';
 
 export * as Constants from './consts/virtual-key-constants.js';
diff --git a/common/web/types/test/ldml-keyboard/test-ldml-keyboard-xml-reader.ts b/common/web/types/test/ldml-keyboard/test-ldml-keyboard-xml-reader.ts
index 0fb1567384..ac791dac33 100644
--- a/common/web/types/test/ldml-keyboard/test-ldml-keyboard-xml-reader.ts
+++ b/common/web/types/test/ldml-keyboard/test-ldml-keyboard-xml-reader.ts
@@ -1,4 +1,4 @@
-import { LKKey } from './../../src/ldml-keyboard/ldml-keyboard-xml';
+import { LKKey } from './../../src/ldml-keyboard/ldml-keyboard-xml.js';
 import 'mocha';
 import {assert} from 'chai';
 import { CommonTypesMessages } from '../../src/util/common-events.js';
diff --git a/developer/src/kmc-model-info/src/model-info-compiler.ts b/developer/src/kmc-model-info/src/model-info-compiler.ts
index 8c9b10db4d..f4480a1d5b 100644
--- a/developer/src/kmc-model-info/src/model-info-compiler.ts
+++ b/developer/src/kmc-model-info/src/model-info-compiler.ts
@@ -9,7 +9,8 @@
 import * as fs from "fs";
 import * as path from "path";
 import { minKeymanVersion } from "./min-keyman-version.js";
-// import KmpJsonFile from "@keymanapp/kmc-package/kmp-json-file";
+import { ModelInfoFile } from "./model-info-file.js";
+import { type KmpJsonFile } from "@keymanapp/kmc-package";
 
 export class ModelInfoOptions {
   /** The identifier for the model */
diff --git a/developer/src/kmc-model-info/src/model-info-file.ts b/developer/src/kmc-model-info/src/model-info-file.ts
index 2320218bf7..36c17fc5aa 100644
--- a/developer/src/kmc-model-info/src/model-info-file.ts
+++ b/developer/src/kmc-model-info/src/model-info-file.ts
@@ -1,4 +1,4 @@
-interface ModelInfoFile {
+export interface ModelInfoFile {
   id?: string;
   name?: string;
   authorName?: string;
@@ -21,12 +21,12 @@ interface ModelInfoFile {
   related?: ModelInfoFileRelated[];
 }
 
-interface ModelInfoFileLink {
+export interface ModelInfoFileLink {
   name: string;
   url: string;
 }
 
-interface ModelInfoFileRelated {
+export interface ModelInfoFileRelated {
   deprecates?: string;
   deprecatedBy?: string;
   note?: string;
diff --git a/developer/src/kmc-model/src/script-overrides-decorator.ts b/developer/src/kmc-model/src/script-overrides-decorator.ts
index 59a425620c..4413a34d26 100644
--- a/developer/src/kmc-model/src/script-overrides-decorator.ts
+++ b/developer/src/kmc-model/src/script-overrides-decorator.ts
@@ -1,4 +1,4 @@
-import { OverrideScriptDefaults } from "./lexical-model";
+import { OverrideScriptDefaults } from "./lexical-model.js";
 
 export function decorateWithScriptOverrides(breaker: WordBreakingFunction, option: OverrideScriptDefaults) {
   if (option !== 'break-words-at-spaces') {
diff --git a/developer/src/kmc-package/src/kmp-compiler.ts b/developer/src/kmc-package/src/kmp-compiler.ts
index 3538bb83e7..718403d18b 100644
--- a/developer/src/kmc-package/src/kmp-compiler.ts
+++ b/developer/src/kmc-package/src/kmp-compiler.ts
@@ -1,12 +1,14 @@
-/// <reference path="kps-file.ts" />
-/// <reference path="kmp-json-file.ts" />
-
 import * as fs from 'fs';
 import * as path from 'path';
 import * as xml2js from 'xml2js';
 import JSZip from 'jszip';
 import KEYMAN_VERSION from "@keymanapp/keyman-version";
 
+import type { KpsFile, KpsFileContentFile, KpsFileInfo, KpsFileKeyboard, KpsFileLanguage, KpsFileLexicalModel, KpsFileOptions, KpsPackage } from './kps-file.js';
+import type { KmpJsonFile, KmpJsonFileInfo, KmpJsonFileLanguage, KmpJsonFileOptions } from './kmp-json-file.js';
+
+export { type KmpJsonFile } from './kmp-json-file.js';
+
 const FILEVERSION_KMP_JSON = '12.0';
 
 export default class KmpCompiler {
diff --git a/developer/src/kmc-package/src/kmp-json-file.ts b/developer/src/kmc-package/src/kmp-json-file.ts
index 3eadb3dd1d..97c560d1f6 100644
--- a/developer/src/kmc-package/src/kmp-json-file.ts
+++ b/developer/src/kmc-package/src/kmp-json-file.ts
@@ -1,4 +1,4 @@
-interface KmpJsonFile {
+export interface KmpJsonFile {
   system: KmpJsonFileSystem;
   options: KmpJsonFileOptions;
   info?: KmpJsonFileInfo;
@@ -9,12 +9,12 @@ interface KmpJsonFile {
   strings?: string[];
 }
 
-interface KmpJsonFileSystem {
+export interface KmpJsonFileSystem {
   keymanDeveloperVersion: string;
   fileVersion: string;
 }
 
-interface KmpJsonFileOptions {
+export interface KmpJsonFileOptions {
   readmeFile?: string;
   graphicFile?: string;
   executeProgram?: string;
@@ -22,7 +22,7 @@ interface KmpJsonFileOptions {
   msiOptions?: string;
 }
 
-interface KmpJsonFileInfo {
+export interface KmpJsonFileInfo {
   website?: KmpJsonFileInfoItem;
   version?: KmpJsonFileInfoItem;
   name?: KmpJsonFileInfoItem;
@@ -30,29 +30,29 @@ interface KmpJsonFileInfo {
   author?: KmpJsonFileInfoItem;
 }
 
-interface KmpJsonFileInfoItem {
+export interface KmpJsonFileInfoItem {
   description: string;
   url?: string;
 }
 
-interface KmpJsonFileContentFile {
+export interface KmpJsonFileContentFile {
   name: string;
   description: string;
   copyLocation?: number;
 }
 
-interface KmpJsonFileLexicalModel {
+export interface KmpJsonFileLexicalModel {
   name: string;
   id: string;
   languages: KmpJsonFileLanguage[];
 }
 
-interface KmpJsonFileLanguage {
+export interface KmpJsonFileLanguage {
   name: string;
   id: string;
 }
 
-interface KmpJsonFileKeyboard {
+export interface KmpJsonFileKeyboard {
   name: string;
   id: string;
   version: string;
@@ -62,13 +62,13 @@ interface KmpJsonFileKeyboard {
   languages?: KmpJsonFileLanguage[];
 }
 
-interface KmpJsonFileStartMenu {
+export interface KmpJsonFileStartMenu {
   folder?: string;
   addUninstallEntry?: boolean;
   items?: KmpJsonFileStartMenuItem[];
 }
 
-interface KmpJsonFileStartMenuItem {
+export interface KmpJsonFileStartMenuItem {
   name: string;
   filename: string;
   arguments?: string;
diff --git a/developer/src/kmc-package/src/kps-file.ts b/developer/src/kmc-package/src/kps-file.ts
index 850c64c550..8d917e3770 100644
--- a/developer/src/kmc-package/src/kps-file.ts
+++ b/developer/src/kmc-package/src/kps-file.ts
@@ -13,14 +13,14 @@
 // * Strings element is not yet checked to be correct
 //
 
-interface KpsPackage {
+export interface KpsPackage {
   /**
    * <Package> -- the root element.
    */
   package: KpsFile;
 }
 
-interface KpsFile {
+export interface KpsFile {
   system: KpsFileSystem;
   options: KpsFileOptions;
   info?: KpsFileInfo;
@@ -31,12 +31,12 @@ interface KpsFile {
   strings?: KpsFileStrings;
 }
 
-interface KpsFileSystem {
+export interface KpsFileSystem {
   keymanDeveloperVersion: string;
   fileVersion: string;
 }
 
-interface KpsFileOptions {
+export interface KpsFileOptions {
   followKeyboardVersion?: string;
   readMeFile?: string;
   graphicFile?: string;
@@ -45,7 +45,7 @@ interface KpsFileOptions {
   msiOptions?: string;
 }
 
-interface KpsFileInfo {
+export interface KpsFileInfo {
   name?: KpsFileInfoItem;
   copyright?: KpsFileInfoItem;
   author?: KpsFileInfoItem;
@@ -53,42 +53,42 @@ interface KpsFileInfo {
   version?: KpsFileInfoItem;
 }
 
-interface KpsFileInfoItem {
+export interface KpsFileInfoItem {
   _: string;
   $: { URL: string };
 }
 
-interface KpsFileContentFiles {
+export interface KpsFileContentFiles {
   file: KpsFileContentFile[] | KpsFileContentFile;
 }
 
-interface KpsFileContentFile {
+export interface KpsFileContentFile {
   name: string;
   description: string;
   copyLocation: string;
   fileType: string;
 }
 
-interface KpsFileLexicalModel {
+export interface KpsFileLexicalModel {
   name: string;
   iD: string;
   languages: KpsFileLanguages;
 }
 
-interface KpsFileLexicalModels {
+export interface KpsFileLexicalModels {
   lexicalModel: KpsFileLexicalModel[] | KpsFileLexicalModel;
 }
 
-interface KpsFileLanguages {
+export interface KpsFileLanguages {
   language: KpsFileLanguage[] | KpsFileLanguage;
 }
 
-interface KpsFileLanguage {
+export interface KpsFileLanguage {
   _: string;
   $: { ID: string }
 }
 
-interface KpsFileKeyboard {
+export interface KpsFileKeyboard {
   name: string;
   iD: string;
   version: string;
@@ -98,17 +98,17 @@ interface KpsFileKeyboard {
   languages?: KpsFileLanguages;
 }
 
-interface KpsFileKeyboards {
+export interface KpsFileKeyboards {
   keyboard: KpsFileKeyboard[] | KpsFileKeyboard;
 }
 
-interface KpsFileStartMenu {
+export interface KpsFileStartMenu {
   folder?: string;
   addUninstallEntry?: string;
   items?: KpsFileStartMenuItems;
 }
 
-interface KpsFileStartMenuItem {
+export interface KpsFileStartMenuItem {
   name: string;
   filename: string;
   arguments?: string;
@@ -116,11 +116,11 @@ interface KpsFileStartMenuItem {
   location?: string;
 }
 
-interface KpsFileStartMenuItems {
+export interface KpsFileStartMenuItems {
   item: KpsFileStartMenuItem[] | KpsFileStartMenuItem;
 }
 
-interface KpsFileStrings {
+export interface KpsFileStrings {
   //TODO: validate this structure
   string: string[] | string;
 }
diff --git a/developer/src/kmc-package/test/test-package-compiler.ts b/developer/src/kmc-package/test/test-package-compiler.ts
index 99fd9850fa..a2850e7fc2 100644
--- a/developer/src/kmc-package/test/test-package-compiler.ts
+++ b/developer/src/kmc-package/test/test-package-compiler.ts
@@ -6,6 +6,7 @@ import KmpCompiler from '../src/kmp-compiler.js';
 import {makePathToFixture} from './helpers/index.js';
 import JSZip from 'jszip';
 import KEYMAN_VERSION from "@keymanapp/keyman-version";
+import { type KmpJsonFile } from '../src/kmp-json-file.js';
 
 describe('KmpCompiler', function () {
   const MODELS : string[] = [
diff --git a/developer/src/kmc/src/kmlmc.ts b/developer/src/kmc/src/kmlmc.ts
index ae7263b073..8e17d76e84 100644
--- a/developer/src/kmc/src/kmlmc.ts
+++ b/developer/src/kmc/src/kmlmc.ts
@@ -6,7 +6,7 @@
 import * as fs from 'fs';
 import { Command } from 'commander';
 import { compileModel } from '@keymanapp/kmc-model';
-import { SysExits } from './util/sysexits';
+import { SysExits } from './util/sysexits.js';
 import KEYMAN_VERSION from "@keymanapp/keyman-version";
 
 let inputFilename: string;
diff --git a/developer/src/kmc/src/kmlmi.ts b/developer/src/kmc/src/kmlmi.ts
index 214d86d405..b3549f4271 100644
--- a/developer/src/kmc/src/kmlmi.ts
+++ b/developer/src/kmc/src/kmlmi.ts
@@ -8,7 +8,7 @@ import * as path from 'path';
 import { Command } from 'commander';
 import KmpCompiler from '@keymanapp/kmc-package';
 import { ModelInfoOptions as ModelInfoOptions, writeMergedModelMetadataFile } from '@keymanapp/kmc-model-info';
-import { SysExits } from './util/sysexits';
+import { SysExits } from './util/sysexits.js';
 import KEYMAN_VERSION from "@keymanapp/keyman-version";
 
 let inputFilename: string;
diff --git a/developer/src/kmc/src/kmlmp.ts b/developer/src/kmc/src/kmlmp.ts
index d7e5508314..6d51b4f58b 100644
--- a/developer/src/kmc/src/kmlmp.ts
+++ b/developer/src/kmc/src/kmlmp.ts
@@ -6,7 +6,7 @@
 import * as fs from 'fs';
 import { Command } from 'commander';
 import KmpCompiler from '@keymanapp/kmc-package';
-import { SysExits } from './util/sysexits';
+import { SysExits } from './util/sysexits.js';
 import KEYMAN_VERSION from "@keymanapp/keyman-version";
 
 let inputFilename: string;
diff --git a/tsconfig.esm-base.json b/tsconfig.esm-base.json
index a6f194d83e..d17d505e5c 100644
--- a/tsconfig.esm-base.json
+++ b/tsconfig.esm-base.json
@@ -4,7 +4,7 @@
   "compilerOptions": {
     "module": "ES2022",
     "target": "es2022",
-    "moduleResolution": "Node",
+    "moduleResolution": "Node16",
     "forceConsistentCasingInFileNames": true,
     "sourceMap": true,
     "alwaysStrict": true,