diff --git a/common/web/types/.c8rc.json b/common/web/types/.c8rc.json
new file mode 100644
index 0000000000..f7137ed999
--- /dev/null
+++ b/common/web/types/.c8rc.json
@@ -0,0 +1,12 @@
+{
+  "exclude": [
+    "src/keyboard-object.ts",
+    "src/lexical-model-types.ts",
+    "src/outputTarget.interface.ts",
+    "src/*.d.ts",
+    "src/main.ts",
+    "src/schemas/*",
+    "src/schema-validators.ts",
+    "src/schemas.ts"
+  ]
+}
diff --git a/common/web/types/build.sh b/common/web/types/build.sh
index 0d7abba7e9..3f7b48f8fc 100755
--- a/common/web/types/build.sh
+++ b/common/web/types/build.sh
@@ -84,21 +84,11 @@ function do_test() {
   tsc --build test
 
   readonly C8_THRESHOLD=60
-  # Exclude files from coverage analysis that only define types:
-  exclude=(\
-    src/keyboard-object.ts \
-    src/lexical-model-types.ts \
-    src/outputTarget.interface.ts \
-    src/*.d.ts \
-    src/main.ts \
-    src/schemas/* \
-    src/schema-validators.ts \
-    src/schemas.ts \
-  )
-  # shellcheck disable=SC2068
+
+  # Excludes are defined in .c8rc.json
   c8 --skip-full --reporter=lcov --reporter=text --lines "${C8_THRESHOLD}" \
     --statements "${C8_THRESHOLD}" --branches "${C8_THRESHOLD}" \
-    --functions "${C8_THRESHOLD}" ${exclude[@]/#/--exclude } \
+    --functions "${C8_THRESHOLD}" \
     mocha "${builder_extra_params[@]}"
 
   builder_echo warning "Coverage thresholds are currently ${C8_THRESHOLD}%, which is lower than ideal."
diff --git a/common/web/types/src/keyboard-object.ts b/common/web/types/src/keyboard-object.ts
index dd6f244672..afd0029af0 100644
--- a/common/web/types/src/keyboard-object.ts
+++ b/common/web/types/src/keyboard-object.ts
@@ -1,23 +1,15 @@
 /*
  * Keyman is copyright (C) SIL Global. MIT License.
  */
-import { OutputTarget } from './outputTarget.interface.js';
 import { TouchLayoutPlatform as LayoutFormFactorSpec } from './keyman-touch-layout/keyman-touch-layout-file.js';
 
 export type ComplexKeyboardStore = (string | { t: 'd', d: number } | { ['t']: 'b' })[];
 
-type KeyEvent = {};
+// A stub for KeyEvent which is properly defined in KeymanWeb
+type KeyEventStub = {};
 
-/**
- * Stores preprocessed properties of a keyboard for quick retrieval later.
- */
-export class CacheTag {
-  stores: { [storeName: string]: ComplexKeyboardStore };
-
-  constructor() {
-    this.stores = {};
-  }
-}
+// A stub for OutputTarget which is properly defined in KeymanWeb
+type OutputTargetStub = {};
 
 export interface EncodedVisualKeyboard {
   /** Represents CSS font styling to use for VisualKeyboard text */
@@ -47,11 +39,6 @@ export type LayoutSpec = {
 }
 
 export type KeyboardObject = {
-  /**
-   * Used internally by Keyman Engine for Web to hold preprocessed stores.
-   */
-  _kmw?: CacheTag;
-
   /**
    * group-start:  the function triggering processing for the keyboard's
    * "Unicode" start group, corresponding to `begin Unicode > use(_____)` in
@@ -60,7 +47,7 @@ export type KeyboardObject = {
    * @param keystroke     The full, pre-processed keystroke triggering
    * keyboard-rule application.
    */
-  gs(outputTarget: OutputTarget, keystroke: KeyEvent): boolean;
+  gs(outputTarget: OutputTargetStub, keystroke: KeyEventStub): boolean;
 
   /**
    * group-newcontext:  the function triggering processing for the keyboard's
@@ -69,7 +56,7 @@ export type KeyboardObject = {
    * @param outputTarget  The new context to be used with future keystrokes
    * @param keystroke     A 'null' `KeyEvent` providing current modifier + state information.
    */
-  gn?(outputTarget: OutputTarget, keystroke: KeyEvent): boolean;
+  gn?(outputTarget: OutputTargetStub, keystroke: KeyEventStub): boolean;
 
   /**
    * group-postkeystroke:  the function triggering processing for the keyboard's
@@ -80,7 +67,7 @@ export type KeyboardObject = {
    * applied.
    * @param keystroke     A 'null' `KeyEvent` providing current modifier + state information.
    */
-  gpk?(outputTarget: OutputTarget, keystroke: KeyEvent): boolean;
+  gpk?(outputTarget: OutputTargetStub, keystroke: KeyEventStub): boolean;
 
   /**
    * Keyboard ID:  the uniquely-identifying name for this keyboard.  Includes the standard
@@ -169,11 +156,6 @@ export type KeyboardObject = {
    * touch layouts if set and no touch-layout information is available.
    */
   KDU?: number;
-  /**
-   * Virtual Key Dictionary: the engine pre-processed, unminified dictionary.  This is built within
-   * Keyman Engine for Web at runtime as needed based on the definitions in `KVKD`.
-   */
-  VKDictionary?: Record<string, number>,
   /**
    * Keyboard Help File: Embedded JS script designed for use with a keyboard's
    * HTML help text.  Always defined within the file referenced by &kmw_embedjs
@@ -193,6 +175,6 @@ export type KeyboardObject = {
    * @param       {number}    _PData        1 or 0
    * @returns
    */
-  KNS?: (_PCommand: number, _PTarget: OutputTarget, _PData: number) => void;
+  KNS?: (_PCommand: number, _PTarget: OutputTargetStub, _PData: number) => void;
 } & Record<`s${number}`, string>
 
diff --git a/common/web/types/src/main.ts b/common/web/types/src/main.ts
index eb0b8a7596..bd1cafbf57 100644
--- a/common/web/types/src/main.ts
+++ b/common/web/types/src/main.ts
@@ -32,5 +32,4 @@ export { ElementString } from './kmx/kmx-plus/element-string.js';
 
 export { USVString, CasingForm, CasingFunction, TextWithProbability, LexiconTraversal, LexicalModel, LexicalModelPunctuation, Transform, Suggestion, Reversion, Keep, SuggestionTag, Context, Distribution, Outcome, WithOutcome, ProbabilityMass, Configuration, Capabilities, WordBreakingFunction, Span } from './lexical-model-types.js';
 
-export { CacheTag, ComplexKeyboardStore, EncodedVisualKeyboard, LayoutSpec, KeyboardObject } from './keyboard-object.js';
-export { OutputTarget } from './outputTarget.interface.js';
+export { ComplexKeyboardStore, EncodedVisualKeyboard, LayoutSpec, KeyboardObject } from './keyboard-object.js';
diff --git a/web/src/engine/interfaces/src/prediction/languageProcessor.interface.ts b/web/src/engine/interfaces/src/prediction/languageProcessor.interface.ts
index 52ed1ca510..971566058e 100644
--- a/web/src/engine/interfaces/src/prediction/languageProcessor.interface.ts
+++ b/web/src/engine/interfaces/src/prediction/languageProcessor.interface.ts
@@ -1,5 +1,6 @@
-import { OutputTarget, Suggestion, Reversion } from '@keymanapp/common-types';
+import { Suggestion, Reversion } from '@keymanapp/common-types';
 import { EventEmitter } from "eventemitter3";
+import { OutputTarget } from 'keyman/engine/keyboard';
 
 export class ReadySuggestions {
   suggestions: Suggestion[];
diff --git a/web/src/engine/interfaces/src/prediction/predictionContext.ts b/web/src/engine/interfaces/src/prediction/predictionContext.ts
index 67c433d3f2..943160eb9d 100644
--- a/web/src/engine/interfaces/src/prediction/predictionContext.ts
+++ b/web/src/engine/interfaces/src/prediction/predictionContext.ts
@@ -1,6 +1,7 @@
 import { EventEmitter } from "eventemitter3";
-import { Keep, type OutputTarget, Reversion, Suggestion } from '@keymanapp/common-types';
-import { type LanguageProcessorSpec , ReadySuggestions, type InvalidateSourceEnum, StateChangeHandler } from './languageProcessor.interface.js';
+import { Keep, Reversion, Suggestion } from '@keymanapp/common-types';
+import { type LanguageProcessorSpec, ReadySuggestions, type InvalidateSourceEnum, StateChangeHandler } from './languageProcessor.interface.js';
+import { type OutputTarget } from 'keyman/engine/keyboard';
 
 interface PredictionContextEventMap {
   update: (suggestions: Suggestion[]) => void;
diff --git a/web/src/engine/js-processor/src/outputTarget.ts b/web/src/engine/js-processor/src/outputTarget.ts
index 2962046692..c055e47602 100644
--- a/web/src/engine/js-processor/src/outputTarget.ts
+++ b/web/src/engine/js-processor/src/outputTarget.ts
@@ -1,13 +1,14 @@
 import { extendString } from "@keymanapp/web-utils";
 import { findCommonSubstringEndIndex } from "./stringDivergence.js";
 import { Mock } from "./mock.js";
+import { OutputTarget as OutputTargetInterface } from 'keyman/engine/keyboard';
 
 extendString();
 
 // Defines deadkey management in a manner attachable to each element interface.
 import { type KeyEvent } from 'keyman/engine/keyboard';
 import { Deadkey, DeadkeyTracker } from "./deadkeys.js";
-import { OutputTarget as OutputTargetInterface, ProbabilityMass, Transform } from '@keymanapp/common-types';
+import { ProbabilityMass, Transform } from '@keymanapp/common-types';
 
 // Also relies on string-extensions provided by the web-utils package.
 
diff --git a/web/src/engine/keyboard/src/defaultRules.ts b/web/src/engine/keyboard/src/defaultRules.ts
index c1e8c97968..b6ad708fd9 100644
--- a/web/src/engine/keyboard/src/defaultRules.ts
+++ b/web/src/engine/keyboard/src/defaultRules.ts
@@ -4,9 +4,10 @@
  * Implementation of default rules
  */
 
-import { ModifierKeyConstants, type OutputTarget } from '@keymanapp/common-types';
+import { ModifierKeyConstants } from '@keymanapp/common-types';
 import Codes from './codes.js';
 import type KeyEvent from './keyEvent.js';
+import { type OutputTarget } from './outputTarget.interface.js';
 
 export enum EmulationKeystrokes {
   Enter = '\n',
diff --git a/web/src/engine/keyboard/src/index.ts b/web/src/engine/keyboard/src/index.ts
index 830e37fa90..28b6331c21 100644
--- a/web/src/engine/keyboard/src/index.ts
+++ b/web/src/engine/keyboard/src/index.ts
@@ -31,11 +31,12 @@ export * from "./defaultRules.js";
 export { default as KeyEvent } from "./keyEvent.js";
 export * from "./keyEvent.js";
 export { default as KeyMapping } from "./keyMapping.js";
+export { OutputTarget } from "./outputTarget.interface.js";
 
 export * from "@keymanapp/web-utils";
 
 // At the top level, there should be no default export.
 
-// Without the line below... KeyMapping would likely be aliased there, as it's
+// Without the line below... OutputTarget would likely be aliased there, as it's
 // the last `export { default as _ }` => `export * from` pairing seen above.
 export default undefined;
diff --git a/web/src/engine/keyboard/src/keyboards/keyboard.ts b/web/src/engine/keyboard/src/keyboards/keyboard.ts
index 01e584a36d..0d58f46706 100644
--- a/web/src/engine/keyboard/src/keyboards/keyboard.ts
+++ b/web/src/engine/keyboard/src/keyboards/keyboard.ts
@@ -2,12 +2,24 @@ import Codes from "../codes.js";
 import { Layouts } from "./defaultLayouts.js";
 import { ActiveKey, ActiveLayout, ActiveSubKey } from "./activeLayout.js";
 import KeyEvent from "../keyEvent.js";
-import { CacheTag, ComplexKeyboardStore, KeyboardObject, LayoutSpec, ModifierKeyConstants, type OutputTarget, TouchLayout } from "@keymanapp/common-types";
+import { type OutputTarget } from '../outputTarget.interface.js';
+import { ComplexKeyboardStore, KeyboardObject, LayoutSpec, ModifierKeyConstants, TouchLayout } from "@keymanapp/common-types";
 type TouchLayoutSpec = TouchLayout.TouchLayoutPlatform & { isDefault?: boolean};
 
 import { Version, DeviceSpec } from "@keymanapp/web-utils";
 import StateKeyMap from "./stateKeyMap.js";
 
+/**
+ * Stores preprocessed properties of a keyboard for quick retrieval later.
+ */
+class CacheTag {
+  stores: { [storeName: string]: ComplexKeyboardStore };
+
+  constructor() {
+    this.stores = {};
+  }
+}
+
 export enum LayoutState {
   NOT_LOADED = undefined,
   POLYFILLED = 1,
@@ -18,13 +30,25 @@ export interface VariableStoreDictionary {
   [name: string]: string;
 };
 
+type KmwKeyboardObject = KeyboardObject & {
+  /**
+   * Used internally by Keyman Engine for Web to hold preprocessed stores.
+   */
+  _kmw?: CacheTag;
+  /**
+   * Virtual Key Dictionary: the engine pre-processed, unminified dictionary.  This is built within
+   * Keyman Engine for Web at runtime as needed based on the definitions in `KVKD`.
+   */
+  VKDictionary?: Record<string, number>,
+};
+
 /**
  * Acts as a wrapper class for Keyman keyboards compiled to JS, providing type information
  * and keyboard-centered functionality in an object-oriented way without modifying the
  * wrapped keyboard itself.
  */
 export default class Keyboard {
-  public static DEFAULT_SCRIPT_OBJECT: KeyboardObject = {
+  public static DEFAULT_SCRIPT_OBJECT: KmwKeyboardObject = {
     'gs': function(outputTarget: OutputTarget, keystroke: KeyEvent) { return false; }, // no matching rules; rely on defaultRuleOutput entirely
     'KI': '', // The currently-existing default keyboard ID; we already have checks that focus against this.
     'KN': '',
@@ -38,7 +62,7 @@ export default class Keyboard {
    *
    * TODO:  Make this private instead.  But there are a LOT of references that must be rooted out first.
    */
-  public readonly scriptObject: KeyboardObject;
+  public readonly scriptObject: KmwKeyboardObject;
   private layoutStates: {[layout: string]: LayoutState};
 
   constructor(keyboardScript: any) {
@@ -544,7 +568,7 @@ export default class Keyboard {
    * @return      {number}                key code > 255 on success, or 0 if not found
    */
   getVKDictionaryCode(keyName: string) {
-    const dict = this.scriptObject['VKDictionary'] || {} as KeyboardObject['VKDictionary'];
+    const dict = this.scriptObject['VKDictionary'] || {} as KmwKeyboardObject['VKDictionary'];
     if(!this.scriptObject['VKDictionary']) {
       if(typeof this.scriptObject['KVKD'] == 'string') {
         // Build the VK dictionary
diff --git a/common/web/types/src/outputTarget.interface.ts b/web/src/engine/keyboard/src/outputTarget.interface.ts
similarity index 100%
rename from common/web/types/src/outputTarget.interface.ts
rename to web/src/engine/keyboard/src/outputTarget.interface.ts