diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a54d565..c154996 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,13 +21,9 @@ jobs:
       run: npm ci
     - name: Build library
       run: make lib
-    - name: post-lib node info
-      run: which node && node --version && npm --version
     - name: Typecheck
       run: make typecheck
     - name: Check formatting
       run: make checkformat
-    - name: Mode node info
-      run: which node && node --version && npm --version
     - name: Run tests
       run: make test
diff --git a/.node-version b/.node-version
index 4486a40..510c921 100644
--- a/.node-version
+++ b/.node-version
@@ -1 +1 @@
-22.2.0
\ No newline at end of file
+22.3.0
\ No newline at end of file
diff --git a/Makefile b/Makefile
index 2ec144c..ad40928 100644
--- a/Makefile
+++ b/Makefile
@@ -34,20 +34,11 @@ checkformat:
 	node_modules/.bin/prettier --check {src,test}/**/*.js
 
 .PHONY: typecheck
-typecheck:
+typecheck: build/tesseract-core.d.ts
 	node_modules/.bin/tsc
 
 .PHONY: test
 test: third_party/tessdata_fast
-	SHELL=/bin/bash
-	echo "Current Shell: $$SHELL"
-	echo "PATH: $$PATH"
-	echo "Checking user permissions:"
-	id
-	which node
-	type node
-	alias
-	node --version
 	node --test test/ocr-engine-test.js
 
 .PHONY: release
@@ -161,7 +152,6 @@ build/tesseract-core.js build/tesseract-core.wasm: src/lib.cpp src/tesseract-ini
 	emcc src/lib.cpp $(EMCC_FLAGS) \
 		-I$(INSTALL_DIR)/include/ -L$(INSTALL_DIR)/lib/ -ltesseract -lleptonica -lembind \
 		-o build/tesseract-core.js
-	cp src/tesseract-core.d.ts build/
 
 # Build fallback WASM binary for browsers that don't support WASM SIMD. The JS
 # output from this build is not used.
@@ -170,6 +160,9 @@ build/tesseract-core-fallback.js build/tesseract-core-fallback.wasm: src/lib.cpp
 		-I$(INSTALL_DIR)/include/ -L$(FALLBACK_INSTALL_DIR)/lib/ -L$(INSTALL_DIR)/lib -ltesseract -lleptonica -lembind \
 		-o build/tesseract-core-fallback.js
 
+build/tesseract-core.d.ts: src/tesseract-core.d.ts build
+	cp $< $@
+
 dist/tesseract-core.wasm: build/tesseract-core.wasm
 	mkdir -p dist/
 	cp $< $@
diff --git a/src/ocr-engine.ts b/src/ocr-engine.ts
index 3aeffcb..fa40217 100644
--- a/src/ocr-engine.ts
+++ b/src/ocr-engine.ts
@@ -1,5 +1,4 @@
-// @ts-ignore - Don't error if library hasn't been built yet.
-import initTesseractCore from "../build/tesseract-core";
+import initTesseractCore, {MainModule, OCREngine as WASMOCREngine} from "../build/tesseract-core";
 
 import { imageDataFromBitmap } from "./utils";
 
@@ -89,8 +88,8 @@ export type ProgressListener = (progress: number) => void;
  * Instances are constructed using {@link createOCREngine}.
  */
 export class OCREngine {
-  private _tesseractLib: any;
-  private _engine: any;
+  private _tesseractLib: MainModule;
+  private _engine: WASMOCREngine;
   private _modelLoaded: boolean;
   private _imageLoaded: boolean;
   private _progressChannel?: MessagePort;
@@ -104,7 +103,7 @@ export class OCREngine {
    * @param progressChannel - Channel used to report progress
    *   updates when OCREngine is run on a background thread
    */
-  constructor(tessLib: any, progressChannel?: MessagePort) {
+  constructor(tessLib: MainModule, progressChannel?: MessagePort) {
     this._tesseractLib = tessLib;
     this._engine = new tessLib.OCREngine();
     this._modelLoaded = false;
@@ -116,8 +115,7 @@ export class OCREngine {
    * Shut down the OCR engine and free up resources.
    */
   destroy() {
-    this._engine.delete();
-    this._engine = null;
+    this._engine?.delete();
   }
 
   /**
@@ -130,7 +128,7 @@ export class OCREngine {
     if (!result.success) {
       throw new Error(`Unable to get variable ${name}`);
     }
-    return result.value;
+    return result.value.toString();
   }
 
   /**
@@ -192,7 +190,7 @@ export class OCREngine {
     // Tesseract
     const engineImage = new this._tesseractLib.Image(
       imageData.width,
-      imageData.height
+      imageData.height,
     );
     const engineImageBuf = engineImage.data();
     engineImageBuf.set(new Uint32Array(imageData.data.buffer));
@@ -262,7 +260,7 @@ export class OCREngine {
       this._engine.getTextBoxes(textUnit, (progress: number) => {
         onProgress?.(progress);
         this._progressChannel?.postMessage({ progress });
-      })
+      }),
     );
   }
 
@@ -380,7 +378,7 @@ export type CreateOCREngineOptions = {
    * used to create the tesseract module. Possible options are documented here:
    * https://github.com/emscripten-core/emscripten/blob/1e7472362a7f5844c5bd23214d725b7a3fd18775/src/settings.js#L876
    */
-  emscriptenModuleOptions?: {wasmBinary: ArrayBuffer};
+  emscriptenModuleOptions?: { wasmBinary: ArrayBuffer };
 };
 
 /**
diff --git a/src/tesseract-core.d.ts b/src/tesseract-core.d.ts
index 4bc0cd3..7522d27 100644
--- a/src/tesseract-core.d.ts
+++ b/src/tesseract-core.d.ts
@@ -1,5 +1,102 @@
-// Type definitions for the Emscripten-generated JS entry point for the
-// WASM file.
-export default function initTesseractCore(
-  options: { wasmBinary?: ArrayBuffer } = {}
-): Promise<unknown>;
+// The file below was generated with emcc --emit-tsd
+// and edited by hand where noted
+// TypeScript bindings for emscripten-generated code.  Automatically generated at compile time.
+declare namespace RuntimeExports {
+    let HEAPF32: any;
+    let HEAPF64: any;
+    let HEAP_DATA_VIEW: any;
+    let HEAP8: any;
+    let HEAPU8: any;
+    let HEAP16: any;
+    let HEAPU16: any;
+    let HEAP32: any;
+    let HEAPU32: any;
+    let HEAP64: any;
+    let HEAPU64: any;
+}
+interface WasmModule {
+}
+
+type EmbindString = ArrayBuffer|Uint8Array|Uint8ClampedArray|Int8Array|string;
+export interface Image {
+  data(): any;
+  delete(): void;
+}
+
+export interface OCREngine {
+  getBoundingBoxes(_0: TextUnit): vector<TextRect>;
+  clearImage(): void;
+  getOrientation(): Orientation;
+  getVariable(_0: EmbindString): GetVariableResult;
+  loadImage(_0: Image): OCRResult;
+  loadModel(_0: EmbindString): OCRResult;
+  setVariable(_0: EmbindString, _1: EmbindString): OCRResult;
+  getHOCR(_0: any): string;
+  getText(_0: any): string;
+  getTextBoxes(_0: TextUnit, _1: any): vector<TextRect>;
+  delete(): void;
+}
+
+export interface TextUnitValue<T extends number> {
+  value: T;
+}
+export type TextUnit = TextUnitValue<1>|TextUnitValue<0>;
+
+export interface vector<IntRect> {
+  push_back(_0: IntRect): void;
+  resize(_0: number, _1: IntRect): void;
+  size(): number;
+  get(_0: number): IntRect | undefined;
+  set(_0: number, _1: IntRect): boolean;
+  delete(): void;
+}
+
+export interface vector<TextRect> {
+  size(): number;
+  get(_0: number): TextRect | undefined;
+  push_back(_0: TextRect): void;
+  resize(_0: number, _1: TextRect): void;
+  set(_0: number, _1: TextRect): boolean;
+  delete(): void;
+}
+
+export type IntRect = {
+  left: number,
+  top: number,
+  right: number,
+  bottom: number
+};
+
+export type Orientation = {
+  rotation: number,
+  confidence: number
+};
+
+export type TextRect = {
+  rect: IntRect,
+  flags: number,
+  confidence: number,
+  text: EmbindString
+};
+
+export type GetVariableResult = {
+  success: boolean,
+  value: EmbindString
+};
+
+export type OCRResult = {
+  error: EmbindString
+};
+
+interface EmbindModule {
+  Image: {new(_0: number, _1: number): Image};
+  OCREngine: {new(): OCREngine};
+  TextUnit: {Line: TextUnitValue<1>, Word: TextUnitValue<0>};
+  // the following two invalid lines are commented out by hand:
+  // they seem to be a result of a bug in the emscripten bindings
+  // vector<IntRect>: {new(): vector<IntRect>};
+  // vector<TextRect>: {new(): vector<TextRect>};
+}
+
+export type MainModule = WasmModule & typeof RuntimeExports & EmbindModule;
+export default function MainModuleFactory (options?: unknown): Promise<MainModule>;