diff --git a/codecs/avif/enc/avif_enc.d.ts b/codecs/avif/enc/avif_enc.d.ts
index 2f1436fe..e32d84b9 100644
--- a/codecs/avif/enc/avif_enc.d.ts
+++ b/codecs/avif/enc/avif_enc.d.ts
@@ -1,4 +1,13 @@
-import { EncodeOptions } from 'image-worker/avifEncode';
+export interface EncodeOptions {
+  minQuantizer: number;
+  maxQuantizer: number;
+  minQuantizerAlpha: number;
+  maxQuantizerAlpha: number;
+  tileRowsLog2: number;
+  tileColsLog2: number;
+  speed: number;
+  subsample: number;
+}
 
 export interface AVIFModule extends EmscriptenWasm.Module {
   encode(
diff --git a/codecs/mozjpeg_enc/mozjpeg_enc.d.ts b/codecs/mozjpeg_enc/mozjpeg_enc.d.ts
index b7669b14..3c730ae3 100644
--- a/codecs/mozjpeg_enc/mozjpeg_enc.d.ts
+++ b/codecs/mozjpeg_enc/mozjpeg_enc.d.ts
@@ -1,4 +1,27 @@
-import { EncodeOptions } from 'image-worker/mozjpegEncode';
+export const enum MozJpegColorSpace {
+  GRAYSCALE = 1,
+  RGB,
+  YCbCr,
+}
+
+export interface EncodeOptions {
+  quality: number;
+  baseline: boolean;
+  arithmetic: boolean;
+  progressive: boolean;
+  optimize_coding: boolean;
+  smoothing: number;
+  color_space: MozJpegColorSpace;
+  quant_table: number;
+  trellis_multipass: boolean;
+  trellis_opt_zero: boolean;
+  trellis_opt_table: boolean;
+  trellis_loops: number;
+  auto_subsample: boolean;
+  chroma_subsample: number;
+  separate_chroma_quality: boolean;
+  chroma_quality: number;
+}
 
 export interface MozJPEGModule extends EmscriptenWasm.Module {
   encode(
diff --git a/codecs/webp/enc/webp_enc.d.ts b/codecs/webp/enc/webp_enc.d.ts
index 1d5ad92c..28019151 100644
--- a/codecs/webp/enc/webp_enc.d.ts
+++ b/codecs/webp/enc/webp_enc.d.ts
@@ -1,4 +1,32 @@
-import { EncodeOptions } from 'image-worker/webpEncode';
+export interface EncodeOptions {
+  quality: number;
+  target_size: number;
+  target_PSNR: number;
+  method: number;
+  sns_strength: number;
+  filter_strength: number;
+  filter_sharpness: number;
+  filter_type: number;
+  partitions: number;
+  segments: number;
+  pass: number;
+  show_compressed: number;
+  preprocessing: number;
+  autofilter: number;
+  partition_limit: number;
+  alpha_compression: number;
+  alpha_filtering: number;
+  alpha_quality: number;
+  lossless: number;
+  exact: number;
+  image_hint: number;
+  emulate_jpeg_size: number;
+  thread_level: number;
+  low_memory: number;
+  near_lossless: number;
+  use_delta_palette: number;
+  use_sharp_yuv: number;
+}
 
 export interface WebPModule extends EmscriptenWasm.Module {
   encode(
diff --git a/src/image-worker/avifEncode/index.ts b/src/image-worker/avifEncode/index.ts
index 66c707a1..143bbb94 100644
--- a/src/image-worker/avifEncode/index.ts
+++ b/src/image-worker/avifEncode/index.ts
@@ -10,21 +10,13 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import avifEncoder, { AVIFModule } from 'codecs/avif/enc/avif_enc';
+import avifEncoder, {
+  AVIFModule,
+  EncodeOptions,
+} from 'codecs/avif/enc/avif_enc';
 import wasmUrl from 'url:codecs/avif/enc/avif_enc.wasm';
 import { initEmscriptenModule } from '../util';
 
-export interface EncodeOptions {
-  minQuantizer: number;
-  maxQuantizer: number;
-  minQuantizerAlpha: number;
-  maxQuantizerAlpha: number;
-  tileRowsLog2: number;
-  tileColsLog2: number;
-  speed: number;
-  subsample: number;
-}
-
 let emscriptenModule: Promise<AVIFModule>;
 
 export default async function encode(
diff --git a/src/image-worker/mozjpegEncode/index.ts b/src/image-worker/mozjpegEncode/index.ts
index 953f76ee..cd593de6 100644
--- a/src/image-worker/mozjpegEncode/index.ts
+++ b/src/image-worker/mozjpegEncode/index.ts
@@ -10,35 +10,13 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import mozjpeg_enc, { MozJPEGModule } from 'codecs/mozjpeg_enc/mozjpeg_enc';
+import mozjpeg_enc, {
+  MozJPEGModule,
+  EncodeOptions,
+} from 'codecs/mozjpeg_enc/mozjpeg_enc';
 import wasmUrl from 'url:codecs/mozjpeg_enc/mozjpeg_enc.wasm';
 import { initEmscriptenModule } from '../util';
 
-export const enum MozJpegColorSpace {
-  GRAYSCALE = 1,
-  RGB,
-  YCbCr,
-}
-
-export interface EncodeOptions {
-  quality: number;
-  baseline: boolean;
-  arithmetic: boolean;
-  progressive: boolean;
-  optimize_coding: boolean;
-  smoothing: number;
-  color_space: MozJpegColorSpace;
-  quant_table: number;
-  trellis_multipass: boolean;
-  trellis_opt_zero: boolean;
-  trellis_opt_table: boolean;
-  trellis_loops: number;
-  auto_subsample: boolean;
-  chroma_subsample: number;
-  separate_chroma_quality: boolean;
-  chroma_quality: number;
-}
-
 let emscriptenModule: Promise<MozJPEGModule>;
 
 export default async function encode(
diff --git a/src/image-worker/quantize/index.ts b/src/image-worker/quantize/index.ts
index 2418ace7..6782aa3e 100644
--- a/src/image-worker/quantize/index.ts
+++ b/src/image-worker/quantize/index.ts
@@ -20,12 +20,6 @@ export interface QuantizeOptions {
   dither: number;
 }
 
-export const defaultOptions: QuantizeOptions = {
-  zx: 0,
-  maxNumColors: 256,
-  dither: 1.0,
-};
-
 let emscriptenModule: Promise<QuantizerModule>;
 
 export default async function process(
diff --git a/src/image-worker/webpEncode/index.ts b/src/image-worker/webpEncode/index.ts
index 3406b2fd..1fe35e87 100644
--- a/src/image-worker/webpEncode/index.ts
+++ b/src/image-worker/webpEncode/index.ts
@@ -10,40 +10,13 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import webpEncoder, { WebPModule } from 'codecs/webp/enc/webp_enc';
+import webpEncoder, {
+  WebPModule,
+  EncodeOptions,
+} from 'codecs/webp/enc/webp_enc';
 import wasmUrl from 'url:codecs/webp/enc/webp_enc.wasm';
 import { initEmscriptenModule } from '../util';
 
-export interface EncodeOptions {
-  quality: number;
-  target_size: number;
-  target_PSNR: number;
-  method: number;
-  sns_strength: number;
-  filter_strength: number;
-  filter_sharpness: number;
-  filter_type: number;
-  partitions: number;
-  segments: number;
-  pass: number;
-  show_compressed: number;
-  preprocessing: number;
-  autofilter: number;
-  partition_limit: number;
-  alpha_compression: number;
-  alpha_filtering: number;
-  alpha_quality: number;
-  lossless: number;
-  exact: number;
-  image_hint: number;
-  emulate_jpeg_size: number;
-  thread_level: number;
-  low_memory: number;
-  near_lossless: number;
-  use_delta_palette: number;
-  use_sharp_yuv: number;
-}
-
 let emscriptenModule: Promise<WebPModule>;
 
 export default async function encode(