diff --git a/packages/upscalerjs/src/args.browser.ts b/packages/upscalerjs/src/args.browser.ts
index 0231f949a..1f988bfc3 100644
--- a/packages/upscalerjs/src/args.browser.ts
+++ b/packages/upscalerjs/src/args.browser.ts
@@ -1,4 +1,4 @@
-import { BASE64, UpscaleArgs, TENSOR, PrivateUpscaleArgs, } from "./types";
+import { BASE64, TENSOR, GetUpscaleOptions, } from "./types";
 
 const getOutputOption = (output?: unknown): TENSOR | BASE64 => {
   if (output === 'tensor') {
@@ -7,14 +7,14 @@ const getOutputOption = (output?: unknown): TENSOR | BASE64 => {
   return 'base64';
 };
 
-export function getUpscaleOptions({
+export const getUpscaleOptions: GetUpscaleOptions = ({
   output,
   progressOutput,
   ...options
-}: Omit<UpscaleArgs, 'output' | 'progressOutput'> & { output?: unknown; progressOutput?: unknown } = {}): PrivateUpscaleArgs {
+} = {}) => {
   return {
     ...options,
     output: getOutputOption(output),
     progressOutput: getOutputOption(progressOutput || output),
   };
-}
+};
diff --git a/packages/upscalerjs/src/args.node.ts b/packages/upscalerjs/src/args.node.ts
index 02fb7d83d..75fb95226 100644
--- a/packages/upscalerjs/src/args.node.ts
+++ b/packages/upscalerjs/src/args.node.ts
@@ -1,4 +1,4 @@
-import { BASE64, UpscaleArgs, TENSOR, PrivateUpscaleArgs, } from "./types";
+import { BASE64, TENSOR, GetUpscaleOptions, } from "./types";
 
 const getOutputOption = (output?: unknown): TENSOR | BASE64 => {
   if (output === 'base64') {
@@ -7,14 +7,14 @@ const getOutputOption = (output?: unknown): TENSOR | BASE64 => {
   return 'tensor';
 };
 
-export function getUpscaleOptions({
+export const getUpscaleOptions: GetUpscaleOptions = ({
   output,
   progressOutput,
   ...options
-}: Omit<UpscaleArgs, 'output' | 'progressOutput'> & { output?: unknown; progressOutput?: unknown } = {}): PrivateUpscaleArgs {
+} = {}) => {
   return {
     ...options,
     output: getOutputOption(output),
     progressOutput: getOutputOption(progressOutput || output),
   };
-}
+};
diff --git a/packages/upscalerjs/src/image.browser.ts b/packages/upscalerjs/src/image.browser.ts
index b9d55487d..f2e152ebe 100644
--- a/packages/upscalerjs/src/image.browser.ts
+++ b/packages/upscalerjs/src/image.browser.ts
@@ -88,7 +88,7 @@ export const isHTMLImageElement = (pixels: Input): pixels is HTMLImageElement =>
   }
 };
 
-export const tensorAsBase64: TensorAsBase64 = (tf, tensor) => {
+export const tensorAsBase64: TensorAsBase64<typeof tf> = (tf, tensor) => {
   const arr = tensorAsClampedArray(tf, tensor);
   const [height, width, ] = tensor.shape;
   const imageData = new ImageData(width, height);
diff --git a/packages/upscalerjs/src/image.node.ts b/packages/upscalerjs/src/image.node.ts
index d77303c92..cc4872cd1 100644
--- a/packages/upscalerjs/src/image.node.ts
+++ b/packages/upscalerjs/src/image.node.ts
@@ -85,7 +85,7 @@ export const getImageAsTensor: GetImageAsTensor<TFN, Input> = async ( // skipcq:
   throw getInvalidTensorError(tensor);
 };
 
-export const tensorAsBase64: TensorAsBase64 = (tf, tensor) => {
+export const tensorAsBase64: TensorAsBase64<TFN> = (tf, tensor) => {
   const arr = tensorAsClampedArray(tf, tensor);
   return Buffer.from(arr).toString('base64');
 };
diff --git a/packages/upscalerjs/src/loadModel.browser.ts b/packages/upscalerjs/src/loadModel.browser.ts
index 191002a25..fc727df32 100644
--- a/packages/upscalerjs/src/loadModel.browser.ts
+++ b/packages/upscalerjs/src/loadModel.browser.ts
@@ -1,6 +1,6 @@
 import type { LayersModel, } from '@tensorflow/tfjs-layers';
-import type { ModelDefinition, ModelType, ModelConfigurationInternals, GraphModel, } from '@upscalerjs/core';
-import type { ParsedModelDefinition, ModelPackage, } from './types';
+import type { ModelType, ModelConfigurationInternals, GraphModel, } from '@upscalerjs/core';
+import type { ParsedModelDefinition, LoadModel, } from './types';
 import {
   loadTfModel,
   parseModelDefinition,
@@ -64,10 +64,7 @@ export async function fetchModel<M extends ModelType, R = M extends 'graph' ? Gr
   throw getLoadModelErrorMessage(errs, modelPath || _internals.path, _internals);
 }
 
-export const loadModel = async (
-  tf: TF,
-  _modelDefinition: Promise<ModelDefinition>,
-): Promise<ModelPackage> => {
+export const loadModel: LoadModel<TF> = async (tf, _modelDefinition) => {
   const modelDefinition = await _modelDefinition;
   
   try {
diff --git a/packages/upscalerjs/src/loadModel.node.ts b/packages/upscalerjs/src/loadModel.node.ts
index d96030a90..b68ee0a48 100644
--- a/packages/upscalerjs/src/loadModel.node.ts
+++ b/packages/upscalerjs/src/loadModel.node.ts
@@ -1,8 +1,7 @@
 import path from 'path';
-import type { ModelDefinition, } from "@upscalerjs/core";
 import { loadTfModel, parseModelDefinition, } from './model-utils';
 import { resolver, } from './resolver';
-import { ParsedModelDefinition, ModelPackage, } from './types';
+import { ParsedModelDefinition, LoadModel, } from './types';
 import {
   isValidModelDefinition,
   TF,
@@ -42,10 +41,7 @@ export const getModelPath = (modelConfiguration: ParsedModelDefinition): string
   return `file://${path.resolve(moduleFolder, _internals.path)}`;
 };
 
-export const loadModel = async (
-  tf: TF,
-  _modelDefinition: Promise<ModelDefinition>,
-): Promise<ModelPackage> => {
+export const loadModel: LoadModel<TF> = async (tf, _modelDefinition) => {
   const modelDefinition = await _modelDefinition;
   try {
     isValidModelDefinition(modelDefinition);
diff --git a/packages/upscalerjs/src/types.ts b/packages/upscalerjs/src/types.ts
index e0dc700f6..9e2ffb792 100644
--- a/packages/upscalerjs/src/types.ts
+++ b/packages/upscalerjs/src/types.ts
@@ -90,7 +90,12 @@ export type CheckValidEnvironment<T> = (input: T, opts: {
   progressOutput?: ResultFormat;
 }) => void;
 export type GetImageAsTensor<T extends TF, I> = (tf: T, input: I) => Promise<Tensor4D>;
-export type TensorAsBase64 = (tf: TF, tensor: Tensor3D) => string;
+export type TensorAsBase64<T extends TF> = (tf: T, tensor: Tensor3D) => string;
+export type LoadModel<T extends TF> = (tf: T, _modelDefinition: Promise<ModelDefinition>) => Promise<ModelPackage>;
+export type GetUpscaleOptions = (args?: Omit<UpscaleArgs, 'output' | 'progressOutput'> & {
+  output?: unknown;
+  progressOutput?: unknown
+}) => PrivateUpscaleArgs;
 
 export type Coordinate = [number, number];
 
diff --git a/packages/upscalerjs/src/upscale.ts b/packages/upscalerjs/src/upscale.ts
index e63fb9f60..c0c768de4 100644
--- a/packages/upscalerjs/src/upscale.ts
+++ b/packages/upscalerjs/src/upscale.ts
@@ -300,7 +300,7 @@ export async function* upscale<T extends TF, I>(
 interface InternalConfig<T extends TF, I> {
   checkValidEnvironment: CheckValidEnvironment<I>;
   getImageAsTensor: GetImageAsTensor<T, I>,
-  tensorAsBase64: TensorAsBase64,
+  tensorAsBase64: TensorAsBase64<T>;
 }
 
 export function cancellableUpscale<T extends TF, I>(
diff --git a/packages/upscalerjs/src/upscaler.ts b/packages/upscalerjs/src/upscaler.ts
index 5a89dbb9a..ef441f7bc 100644
--- a/packages/upscalerjs/src/upscaler.ts
+++ b/packages/upscalerjs/src/upscaler.ts
@@ -91,10 +91,10 @@ export class Upscaler {
     this._opts = {
       ...opts,
     };
-    this._model = loadModel(tf, getModel(tf, this._opts.model || DEFAULT_MODEL));
+    this._model = loadModel(this.tf, getModel(this.tf, this._opts.model || DEFAULT_MODEL));
     this.ready = new Promise((resolve, reject) => {
       this._model.then(() => cancellableWarmup(
-        tf,
+        this.tf,
         this._model,
         (this._opts.warmupSizes || []),
         undefined,
@@ -161,7 +161,7 @@ export class Upscaler {
   ) {
     await this.ready;
     const modelPackage = await this._model;
-    return cancellableUpscale(tf, image, getUpscaleOptions(options), {
+    return cancellableUpscale(this.tf, image, getUpscaleOptions(options), {
       ...modelPackage,
       signal: this._abortController.signal,
     }, {
@@ -195,7 +195,7 @@ export class Upscaler {
   warmup = async (warmupSizes: WarmupSizes = [], options?: WarmupArgs): Promise<void> => {
     await this.ready;
     return cancellableWarmup(
-      tf,
+      this.tf,
       this._model,
       warmupSizes,
       options, {