diff --git a/src/decoder/barcode_decoder.js b/src/decoder/barcode_decoder.js
index 95228d7..0b582be 100644
--- a/src/decoder/barcode_decoder.js
+++ b/src/decoder/barcode_decoder.js
@@ -17,7 +17,7 @@ import UPCEReader from '../reader/upc_e_reader';
 import UPCReader from '../reader/upc_reader';
 import Bresenham from './bresenham';
 
-export const READERS = {
+const READERS = {
     code_128_reader: Code128Reader,
     ean_reader: EANReader,
     ean_5_reader: EAN5Reader,
diff --git a/type-definitions/quagga.d.ts b/type-definitions/quagga.d.ts
index 0f399ae..a74b3db 100644
--- a/type-definitions/quagga.d.ts
+++ b/type-definitions/quagga.d.ts
@@ -3,7 +3,6 @@
 // Project: http://serratus.github.io/quaggaJS/
 // Definitions by: Cam Birch, Peter Horwood aka Madman Pierre, Dan Manastireanu <https://github.com/danmana>
 
-import { READERS } from 'decoder/barcode_decoder';
 import { vec2 } from 'gl-matrix';
 
 // import SubImage from '../src/common/subImage';
@@ -1007,4 +1006,18 @@ export type TypedArray =
     | Float32Array
     | Float64Array;
 
-export type QuaggaJSCodeReader = keyof typeof READERS;
+export type QuaggaJSCodeReader =
+    | 'code_128_reader'
+    | 'ean_reader'
+    | 'ean_5_reader'
+    | 'ean_2_reader'
+    | 'ean_8_reader'
+    | 'code_39_reader'
+    | 'code_39_vin_reader'
+    | 'codabar_reader'
+    | 'upc_reader'
+    | 'upc_e_reader'
+    | 'i2of5_reader'
+    | '2of5_reader'
+    | 'code_93_reader'
+    | 'code_32_reader';