diff --git a/packages-user/data-state/test/nodeReplay.test.ts b/packages-user/data-state/test/nodeReplay.test.ts
index da4bbbb..ecb8474 100644
--- a/packages-user/data-state/test/nodeReplay.test.ts
+++ b/packages-user/data-state/test/nodeReplay.test.ts
@@ -5,7 +5,7 @@ import {
     IReplayVerifierRuntime,
     IReplayVerifierSnapshot,
     verifyReplay
-} from '../../../script/test-data-node';
+} from './replayVerifier';
 
 enum TestCommandOutcome {
     Success,
diff --git a/packages-user/data-state/test/replayVerifier.ts b/packages-user/data-state/test/replayVerifier.ts
new file mode 100644
index 0000000..92f233b
--- /dev/null
+++ b/packages-user/data-state/test/replayVerifier.ts
@@ -0,0 +1,226 @@
+import {
+    IHeroAttr,
+    IReplayArray,
+    IReplayCommand,
+    IReplayStepHandler,
+    ReplayParamValue
+} from '@user/data-common';
+
+export interface IReplayVerifierLayerSnapshot {
+    readonly zIndex: number;
+    readonly matrix: Uint32Array;
+}
+
+export interface IReplayVerifierFloorSnapshot {
+    readonly floorId: string;
+    readonly layers: readonly IReplayVerifierLayerSnapshot[];
+}
+
+export interface IReplayVerifierExpectedSnapshot {
+    readonly hero: IHeroAttr;
+    readonly maps: readonly IReplayVerifierFloorSnapshot[];
+}
+
+export interface IReplayVerifierSandbox {
+    readonly ended: boolean;
+}
+
+export interface IReplayVerifierSnapshot {
+    readonly hero: IHeroAttr;
+    readonly maps: readonly IReplayVerifierFloorSnapshot[];
+}
+
+export interface IReplayVerifierRuntime {
+    readonly route: IReplayArray;
+    readonly expected: IReplayVerifierExpectedSnapshot;
+    readonly sandbox: IReplayVerifierSandbox;
+    getCommand(code: number): IReplayCommand | null;
+    step(): Promise<boolean>;
+    finish(): Promise<void>;
+    snapshot(): IReplayVerifierSnapshot;
+}
+
+class ReplayVerifierError extends Error {
+    readonly index: number;
+    readonly code: number;
+    readonly params: readonly ReplayParamValue[];
+    readonly reason: string;
+
+    constructor(
+        index: number,
+        code: number,
+        params: readonly ReplayParamValue[],
+        reason: string
+    ) {
+        const copiedParams = Array.from(params);
+        super(
+            `Replay verifier divergence: index=${index}; code=${code}; params=${formatReplayParams(copiedParams)}; reason=${reason}`
+        );
+        this.index = index;
+        this.code = code;
+        this.params = copiedParams;
+        this.reason = reason;
+    }
+}
+
+function formatThrownReason(error: unknown): string {
+    if (error instanceof Error) return error.message;
+    return Object.prototype.toString.call(error);
+}
+
+function createDiagnostic(
+    step: IReplayStepHandler | null,
+    index: number,
+    reason: string
+): ReplayVerifierError {
+    return new ReplayVerifierError(
+        index,
+        step?.command ?? 0,
+        step?.params ?? [],
+        reason
+    );
+}
+
+function getLastStep(route: IReplayArray): IReplayStepHandler | null {
+    return route.length === 0 ? null : route.get(route.length - 1);
+}
+
+function compareHero(expected: IHeroAttr, actual: IHeroAttr): string | null {
+    const expectedKeys = Object.keys(expected);
+    const actualKeys = Object.keys(actual);
+    if (expectedKeys.length !== actualKeys.length) {
+        return `hero attribute key count differs: expected ${expectedKeys.length}, actual ${actualKeys.length}`;
+    }
+    for (const key of expectedKeys) {
+        if (!Object.hasOwn(actual, key)) {
+            return `hero attribute ${key} is missing`;
+        }
+        const expectedValue = expected[key as keyof IHeroAttr];
+        const actualValue = actual[key as keyof IHeroAttr];
+        if (!Object.is(expectedValue, actualValue)) {
+            return `hero attribute ${key} differs: expected ${String(expectedValue)}, actual ${String(actualValue)}`;
+        }
+    }
+    return null;
+}
+
+function compareMaps(
+    expected: readonly IReplayVerifierFloorSnapshot[],
+    actual: readonly IReplayVerifierFloorSnapshot[]
+): string | null {
+    if (expected.length !== actual.length) {
+        return `map floor count differs: expected ${expected.length}, actual ${actual.length}`;
+    }
+    for (let floorIndex = 0; floorIndex < expected.length; floorIndex++) {
+        const expectedFloor = expected[floorIndex];
+        const actualFloor = actual[floorIndex];
+        if (expectedFloor.floorId !== actualFloor.floorId) {
+            return `map floor ${floorIndex} differs: expected ${expectedFloor.floorId}, actual ${actualFloor.floorId}`;
+        }
+        if (expectedFloor.layers.length !== actualFloor.layers.length) {
+            return `map floor ${expectedFloor.floorId} layer count differs: expected ${expectedFloor.layers.length}, actual ${actualFloor.layers.length}`;
+        }
+        for (
+            let layerIndex = 0;
+            layerIndex < expectedFloor.layers.length;
+            layerIndex++
+        ) {
+            const expectedLayer = expectedFloor.layers[layerIndex];
+            const actualLayer = actualFloor.layers[layerIndex];
+            if (expectedLayer.zIndex !== actualLayer.zIndex) {
+                return `map floor ${expectedFloor.floorId} layer ${layerIndex} z-index differs: expected ${expectedLayer.zIndex}, actual ${actualLayer.zIndex}`;
+            }
+            if (expectedLayer.matrix.length !== actualLayer.matrix.length) {
+                return `map floor ${expectedFloor.floorId} layer ${expectedLayer.zIndex} length differs: expected ${expectedLayer.matrix.length}, actual ${actualLayer.matrix.length}`;
+            }
+            for (let cell = 0; cell < expectedLayer.matrix.length; cell++) {
+                const expectedValue = expectedLayer.matrix[cell];
+                const actualValue = actualLayer.matrix[cell];
+                if (expectedValue !== actualValue) {
+                    return `map floor ${expectedFloor.floorId} layer ${expectedLayer.zIndex} index ${cell} differs: expected ${expectedValue}, actual ${actualValue}`;
+                }
+            }
+        }
+    }
+    return null;
+}
+
+export function formatReplayParams(
+    params: readonly ReplayParamValue[]
+): string {
+    return `[${params.map(formatReplayParam).join(', ')}]`;
+}
+
+function formatReplayParam(param: ReplayParamValue): string {
+    switch (typeof param) {
+        case 'bigint':
+            return `${param.toString()}n`;
+        case 'string':
+            return JSON.stringify(param);
+        case 'number':
+            if (Object.is(param, -0)) return '-0';
+            if (Number.isNaN(param)) return 'NaN';
+            if (param === Infinity) return 'Infinity';
+            if (param === -Infinity) return '-Infinity';
+            return param.toString();
+        default:
+            return param ? 'true' : 'false';
+    }
+}
+
+export async function verifyReplay(
+    runtime: IReplayVerifierRuntime
+): Promise<void> {
+    for (let index = 0; index < runtime.route.length; index++) {
+        const step = runtime.route.get(index);
+        const command = runtime.getCommand(step.command);
+        if (!command) {
+            throw createDiagnostic(
+                step,
+                index,
+                `unknown replay command code ${step.command}`
+            );
+        }
+        let success: boolean;
+        try {
+            success = await runtime.step();
+        } catch (error) {
+            throw createDiagnostic(
+                step,
+                index,
+                `command threw: ${formatThrownReason(error)}`
+            );
+        }
+        if (!success) {
+            throw createDiagnostic(step, index, 'command returned false');
+        }
+    }
+
+    const lastStep = getLastStep(runtime.route);
+    try {
+        await runtime.finish();
+    } catch (error) {
+        throw createDiagnostic(
+            lastStep,
+            lastStep?.index ?? 0,
+            `replay did not reach normal end: ${formatThrownReason(error)}`
+        );
+    }
+    if (!runtime.sandbox.ended) {
+        throw createDiagnostic(
+            lastStep,
+            lastStep?.index ?? 0,
+            'replay did not reach normal end'
+        );
+    }
+
+    const actual = runtime.snapshot();
+    const heroReason = compareHero(runtime.expected.hero, actual.hero);
+    if (heroReason) {
+        throw createDiagnostic(lastStep, lastStep?.index ?? 0, heroReason);
+    }
+    const mapReason = compareMaps(runtime.expected.maps, actual.maps);
+    if (mapReason) {
+        throw createDiagnostic(lastStep, lastStep?.index ?? 0, mapReason);
+    }
+}
diff --git a/script/test-data-node.ts b/script/test-data-node.ts
index 77c814d..6ab09e7 100644
--- a/script/test-data-node.ts
+++ b/script/test-data-node.ts
@@ -1,30 +1,47 @@
-import { resolve } from 'node:path';
 import { createRequire } from 'node:module';
+import { resolve } from 'node:path';
 import { pathToFileURL } from 'node:url';
 import {
+    IHeroAttr,
     IReplayArray,
     IReplayCommand,
     IReplaySandbox,
-    IReplayStepHandler,
-    IReplaySystem,
-    IHeroAttr,
-    ReplayParamValue
+    IReplaySystem
 } from '@user/data-common';
 import { CoreState } from '../packages-user/data-state/src/core.ts';
 
-interface IClosedLoopLayerSnapshot {
+interface IReplayVerifierLayerSnapshot {
     readonly zIndex: number;
     readonly matrix: Uint32Array;
 }
 
-interface IClosedLoopFloorSnapshot {
+interface IReplayVerifierFloorSnapshot {
     readonly floorId: string;
-    readonly layers: readonly IClosedLoopLayerSnapshot[];
+    readonly layers: readonly IReplayVerifierLayerSnapshot[];
 }
 
-interface IClosedLoopExpectedSnapshot {
+interface IReplayVerifierExpectedSnapshot {
     readonly hero: IHeroAttr;
-    readonly maps: readonly IClosedLoopFloorSnapshot[];
+    readonly maps: readonly IReplayVerifierFloorSnapshot[];
+}
+
+interface IReplayVerifierSnapshot {
+    readonly hero: IHeroAttr;
+    readonly maps: readonly IReplayVerifierFloorSnapshot[];
+}
+
+interface IReplayVerifierRuntime {
+    readonly route: IReplayArray;
+    readonly expected: IReplayVerifierExpectedSnapshot;
+    readonly sandbox: { readonly ended: boolean };
+    getCommand(code: number): IReplayCommand | null;
+    step(): Promise<boolean>;
+    finish(): Promise<void>;
+    snapshot(): IReplayVerifierSnapshot;
+}
+
+interface IVerifierModule {
+    verifyReplay(runtime: IReplayVerifierRuntime): Promise<void>;
 }
 
 interface IClosedLoopFixture {
@@ -32,228 +49,28 @@ interface IClosedLoopFixture {
     readonly replay: IReplaySystem;
     readonly route: IReplayArray;
     readonly sandbox: IReplaySandbox;
-    readonly expected: IClosedLoopExpectedSnapshot;
+    readonly expected: IReplayVerifierExpectedSnapshot;
 }
 
 interface IClosedLoopModule {
     createClosedLoopFixture(): IClosedLoopFixture;
 }
 
-const require = createRequire(import.meta.url);
-
-interface IReplayVerifierSandbox {
-    readonly ended: boolean;
-}
-
 interface IManualReplaySandbox extends IReplaySandbox {
     pausing: boolean;
     playing: boolean;
 }
 
-export interface IReplayVerifierSnapshot {
-    readonly hero: IHeroAttr;
-    readonly maps: readonly IClosedLoopFloorSnapshot[];
-}
+const require = createRequire(import.meta.url);
+const verifierModule =
+    require('../packages-user/data-state/test/replayVerifier.ts') as IVerifierModule;
 
-export interface IReplayVerifierRuntime {
-    readonly route: IReplayArray;
-    readonly expected: IClosedLoopExpectedSnapshot;
-    readonly sandbox: IReplayVerifierSandbox;
-    getCommand(code: number): IReplayCommand | null;
-    step(): Promise<boolean>;
-    finish(): Promise<void>;
-    snapshot(): IReplayVerifierSnapshot;
-}
-
-class ReplayVerifierError extends Error {
-    readonly index: number;
-    readonly code: number;
-    readonly params: readonly ReplayParamValue[];
-    readonly reason: string;
-
-    constructor(
-        index: number,
-        code: number,
-        params: readonly ReplayParamValue[],
-        reason: string
-    ) {
-        const copiedParams = Array.from(params);
-        super(
-            `Replay verifier divergence: index=${index}; code=${code}; params=${formatReplayParams(copiedParams)}; reason=${reason}`
-        );
-        this.index = index;
-        this.code = code;
-        this.params = copiedParams;
-        this.reason = reason;
-    }
-}
-
-function formatThrownReason(error: unknown): string {
-    if (error instanceof Error) return error.message;
-    return Object.prototype.toString.call(error);
-}
-
-function createDiagnostic(
-    step: IReplayStepHandler | null,
-    index: number,
-    reason: string
-): ReplayVerifierError {
-    return new ReplayVerifierError(
-        index,
-        step?.command ?? 0,
-        step?.params ?? [],
-        reason
-    );
-}
-
-function getLastStep(route: IReplayArray): IReplayStepHandler | null {
-    return route.length === 0 ? null : route.get(route.length - 1);
-}
-
-function compareHero(expected: IHeroAttr, actual: IHeroAttr): string | null {
-    const expectedKeys = Object.keys(expected);
-    const actualKeys = Object.keys(actual);
-    if (expectedKeys.length !== actualKeys.length) {
-        return `hero attribute key count differs: expected ${expectedKeys.length}, actual ${actualKeys.length}`;
-    }
-    for (const key of expectedKeys) {
-        if (!Object.hasOwn(actual, key)) {
-            return `hero attribute ${key} is missing`;
-        }
-        const expectedValue = expected[key as keyof IHeroAttr];
-        const actualValue = actual[key as keyof IHeroAttr];
-        if (!Object.is(expectedValue, actualValue)) {
-            return `hero attribute ${key} differs: expected ${String(expectedValue)}, actual ${String(actualValue)}`;
-        }
-    }
-    return null;
-}
-
-function compareMaps(
-    expected: readonly IClosedLoopFloorSnapshot[],
-    actual: readonly IClosedLoopFloorSnapshot[]
-): string | null {
-    if (expected.length !== actual.length) {
-        return `map floor count differs: expected ${expected.length}, actual ${actual.length}`;
-    }
-    for (let floorIndex = 0; floorIndex < expected.length; floorIndex++) {
-        const expectedFloor = expected[floorIndex];
-        const actualFloor = actual[floorIndex];
-        if (expectedFloor.floorId !== actualFloor.floorId) {
-            return `map floor ${floorIndex} differs: expected ${expectedFloor.floorId}, actual ${actualFloor.floorId}`;
-        }
-        if (expectedFloor.layers.length !== actualFloor.layers.length) {
-            return `map floor ${expectedFloor.floorId} layer count differs: expected ${expectedFloor.layers.length}, actual ${actualFloor.layers.length}`;
-        }
-        for (
-            let layerIndex = 0;
-            layerIndex < expectedFloor.layers.length;
-            layerIndex++
-        ) {
-            const expectedLayer = expectedFloor.layers[layerIndex];
-            const actualLayer = actualFloor.layers[layerIndex];
-            if (expectedLayer.zIndex !== actualLayer.zIndex) {
-                return `map floor ${expectedFloor.floorId} layer ${layerIndex} z-index differs: expected ${expectedLayer.zIndex}, actual ${actualLayer.zIndex}`;
-            }
-            if (expectedLayer.matrix.length !== actualLayer.matrix.length) {
-                return `map floor ${expectedFloor.floorId} layer ${expectedLayer.zIndex} length differs: expected ${expectedLayer.matrix.length}, actual ${actualLayer.matrix.length}`;
-            }
-            for (let cell = 0; cell < expectedLayer.matrix.length; cell++) {
-                const expectedValue = expectedLayer.matrix[cell];
-                const actualValue = actualLayer.matrix[cell];
-                if (expectedValue !== actualValue) {
-                    return `map floor ${expectedFloor.floorId} layer ${expectedLayer.zIndex} index ${cell} differs: expected ${expectedValue}, actual ${actualValue}`;
-                }
-            }
-        }
-    }
-    return null;
-}
-
-export function formatReplayParams(
-    params: readonly ReplayParamValue[]
-): string {
-    return `[${params.map(formatReplayParam).join(', ')}]`;
-}
-
-function formatReplayParam(param: ReplayParamValue): string {
-    switch (typeof param) {
-        case 'bigint':
-            return `${param.toString()}n`;
-        case 'string':
-            return JSON.stringify(param);
-        case 'number':
-            if (Object.is(param, -0)) return '-0';
-            if (Number.isNaN(param)) return 'NaN';
-            if (param === Infinity) return 'Infinity';
-            if (param === -Infinity) return '-Infinity';
-            return param.toString();
-        default:
-            return param ? 'true' : 'false';
-    }
-}
-
-export async function verifyReplay(
-    runtime: IReplayVerifierRuntime
-): Promise<void> {
-    for (let index = 0; index < runtime.route.length; index++) {
-        const step = runtime.route.get(index);
-        const command = runtime.getCommand(step.command);
-        if (!command) {
-            throw createDiagnostic(
-                step,
-                index,
-                `unknown replay command code ${step.command}`
-            );
-        }
-        let success: boolean;
-        try {
-            success = await runtime.step();
-        } catch (error) {
-            throw createDiagnostic(
-                step,
-                index,
-                `command threw: ${formatThrownReason(error)}`
-            );
-        }
-        if (!success) {
-            throw createDiagnostic(step, index, 'command returned false');
-        }
-    }
-
-    const lastStep = getLastStep(runtime.route);
-    try {
-        await runtime.finish();
-    } catch (error) {
-        throw createDiagnostic(
-            lastStep,
-            lastStep?.index ?? 0,
-            `replay did not reach normal end: ${formatThrownReason(error)}`
-        );
-    }
-    if (!runtime.sandbox.ended) {
-        throw createDiagnostic(
-            lastStep,
-            lastStep?.index ?? 0,
-            'replay did not reach normal end'
-        );
-    }
-
-    const actual = runtime.snapshot();
-    const heroReason = compareHero(runtime.expected.hero, actual.hero);
-    if (heroReason) {
-        throw createDiagnostic(lastStep, lastStep?.index ?? 0, heroReason);
-    }
-    const mapReason = compareMaps(runtime.expected.maps, actual.maps);
-    if (mapReason) {
-        throw createDiagnostic(lastStep, lastStep?.index ?? 0, mapReason);
-    }
-}
-
-function captureMaps(state: CoreState): readonly IClosedLoopFloorSnapshot[] {
-    const floors: IClosedLoopFloorSnapshot[] = [];
+function captureMaps(
+    state: CoreState
+): readonly IReplayVerifierFloorSnapshot[] {
+    const floors: IReplayVerifierFloorSnapshot[] = [];
     for (const [floorId, map] of state.maps.iterateAllMaps()) {
-        const layers: IClosedLoopLayerSnapshot[] = [];
+        const layers: IReplayVerifierLayerSnapshot[] = [];
         for (const layer of map.layerList) {
             layers.push({
                 zIndex: layer.zIndex,
@@ -302,7 +119,7 @@ export async function runNodeReplayVerifier(): Promise<void> {
     const closedLoopModule =
         require('../packages-user/data-state/test/fixtures/closed-loop.ts') as IClosedLoopModule;
     const fixture = closedLoopModule.createClosedLoopFixture();
-    await verifyReplay(createRuntime(fixture));
+    await verifierModule.verifyReplay(createRuntime(fixture));
 }
 
 const isMainModule =