diff --git a/codecs/oxipng/.appveyor.yml b/codecs/oxipng/.appveyor.yml
deleted file mode 100644
index 50910bd6..00000000
--- a/codecs/oxipng/.appveyor.yml
+++ /dev/null
@@ -1,11 +0,0 @@
-install:
-  - appveyor-retry appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
-  - if not defined RUSTFLAGS rustup-init.exe -y --default-host x86_64-pc-windows-msvc --default-toolchain nightly
-  - set PATH=%PATH%;C:\Users\appveyor\.cargo\bin
-  - rustc -V
-  - cargo -V
-
-build: false
-
-test_script:
-  - cargo test --locked
diff --git a/codecs/oxipng/.gitignore b/codecs/oxipng/.gitignore
index 4e301317..f5de7310 100644
--- a/codecs/oxipng/.gitignore
+++ b/codecs/oxipng/.gitignore
@@ -2,5 +2,4 @@
 **/*.rs.bk
 Cargo.lock
 bin/
-pkg/
 wasm-pack.log
diff --git a/codecs/oxipng/.travis.yml b/codecs/oxipng/.travis.yml
deleted file mode 100644
index 7a913256..00000000
--- a/codecs/oxipng/.travis.yml
+++ /dev/null
@@ -1,69 +0,0 @@
-language: rust
-sudo: false
-
-cache: cargo
-
-matrix:
-  include:
-
-  # Builds with wasm-pack.
-  - rust: beta
-    env: RUST_BACKTRACE=1
-    addons:
-      firefox: latest
-      chrome: stable
-    before_script:
-      - (test -x $HOME/.cargo/bin/cargo-install-update || cargo install cargo-update)
-      - (test -x $HOME/.cargo/bin/cargo-generate || cargo install --vers "^0.2" cargo-generate)
-      - cargo install-update -a
-      - curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh -s -- -f
-    script:
-      - cargo generate --git . --name testing
-      # Having a broken Cargo.toml (in that it has curlies in fields) anywhere
-      # in any of our parent dirs is problematic.
-      - mv Cargo.toml Cargo.toml.tmpl
-      - cd testing
-      - wasm-pack build
-      - wasm-pack test --chrome --firefox --headless
-
-  # Builds on nightly.
-  - rust: nightly
-    env: RUST_BACKTRACE=1
-    before_script:
-      - (test -x $HOME/.cargo/bin/cargo-install-update || cargo install cargo-update)
-      - (test -x $HOME/.cargo/bin/cargo-generate || cargo install --vers "^0.2" cargo-generate)
-      - cargo install-update -a
-      - rustup target add wasm32-unknown-unknown
-    script:
-      - cargo generate --git . --name testing
-      - mv Cargo.toml Cargo.toml.tmpl
-      - cd testing
-      - cargo check
-      - cargo check --target wasm32-unknown-unknown
-      - cargo check                                 --no-default-features
-      - cargo check --target wasm32-unknown-unknown --no-default-features
-      - cargo check                                 --no-default-features --features console_error_panic_hook
-      - cargo check --target wasm32-unknown-unknown --no-default-features --features console_error_panic_hook
-      - cargo check                                 --no-default-features --features "console_error_panic_hook wee_alloc"
-      - cargo check --target wasm32-unknown-unknown --no-default-features --features "console_error_panic_hook wee_alloc"
-
-  # Builds on beta.
-  - rust: beta
-    env: RUST_BACKTRACE=1
-    before_script:
-      - (test -x $HOME/.cargo/bin/cargo-install-update || cargo install cargo-update)
-      - (test -x $HOME/.cargo/bin/cargo-generate || cargo install --vers "^0.2" cargo-generate)
-      - cargo install-update -a
-      - rustup target add wasm32-unknown-unknown
-    script:
-      - cargo generate --git . --name testing
-      - mv Cargo.toml Cargo.toml.tmpl
-      - cd testing
-      - cargo check
-      - cargo check --target wasm32-unknown-unknown
-      - cargo check                                 --no-default-features
-      - cargo check --target wasm32-unknown-unknown --no-default-features
-      - cargo check                                 --no-default-features --features console_error_panic_hook
-      - cargo check --target wasm32-unknown-unknown --no-default-features --features console_error_panic_hook
-      # Note: no enabling the `wee_alloc` feature here because it requires
-      # nightly for now.
diff --git a/codecs/oxipng/Cargo.toml b/codecs/oxipng/Cargo.toml
index ff0639de..eeb7fece 100644
--- a/codecs/oxipng/Cargo.toml
+++ b/codecs/oxipng/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-name = "oxipng"
+name = "oxipng-wasm"
 version = "0.1.0"
 authors = ["Surma <surma@surma.link>"]
 
diff --git a/codecs/oxipng/LICENSE_APACHE b/codecs/oxipng/LICENSE_APACHE
deleted file mode 100644
index 1b5ec8b7..00000000
--- a/codecs/oxipng/LICENSE_APACHE
+++ /dev/null
@@ -1,176 +0,0 @@
-                              Apache License
-                        Version 2.0, January 2004
-                     http://www.apache.org/licenses/
-
-TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
-
-1. Definitions.
-
-   "License" shall mean the terms and conditions for use, reproduction,
-   and distribution as defined by Sections 1 through 9 of this document.
-
-   "Licensor" shall mean the copyright owner or entity authorized by
-   the copyright owner that is granting the License.
-
-   "Legal Entity" shall mean the union of the acting entity and all
-   other entities that control, are controlled by, or are under common
-   control with that entity. For the purposes of this definition,
-   "control" means (i) the power, direct or indirect, to cause the
-   direction or management of such entity, whether by contract or
-   otherwise, or (ii) ownership of fifty percent (50%) or more of the
-   outstanding shares, or (iii) beneficial ownership of such entity.
-
-   "You" (or "Your") shall mean an individual or Legal Entity
-   exercising permissions granted by this License.
-
-   "Source" form shall mean the preferred form for making modifications,
-   including but not limited to software source code, documentation
-   source, and configuration files.
-
-   "Object" form shall mean any form resulting from mechanical
-   transformation or translation of a Source form, including but
-   not limited to compiled object code, generated documentation,
-   and conversions to other media types.
-
-   "Work" shall mean the work of authorship, whether in Source or
-   Object form, made available under the License, as indicated by a
-   copyright notice that is included in or attached to the work
-   (an example is provided in the Appendix below).
-
-   "Derivative Works" shall mean any work, whether in Source or Object
-   form, that is based on (or derived from) the Work and for which the
-   editorial revisions, annotations, elaborations, or other modifications
-   represent, as a whole, an original work of authorship. For the purposes
-   of this License, Derivative Works shall not include works that remain
-   separable from, or merely link (or bind by name) to the interfaces of,
-   the Work and Derivative Works thereof.
-
-   "Contribution" shall mean any work of authorship, including
-   the original version of the Work and any modifications or additions
-   to that Work or Derivative Works thereof, that is intentionally
-   submitted to Licensor for inclusion in the Work by the copyright owner
-   or by an individual or Legal Entity authorized to submit on behalf of
-   the copyright owner. For the purposes of this definition, "submitted"
-   means any form of electronic, verbal, or written communication sent
-   to the Licensor or its representatives, including but not limited to
-   communication on electronic mailing lists, source code control systems,
-   and issue tracking systems that are managed by, or on behalf of, the
-   Licensor for the purpose of discussing and improving the Work, but
-   excluding communication that is conspicuously marked or otherwise
-   designated in writing by the copyright owner as "Not a Contribution."
-
-   "Contributor" shall mean Licensor and any individual or Legal Entity
-   on behalf of whom a Contribution has been received by Licensor and
-   subsequently incorporated within the Work.
-
-2. Grant of Copyright License. Subject to the terms and conditions of
-   this License, each Contributor hereby grants to You a perpetual,
-   worldwide, non-exclusive, no-charge, royalty-free, irrevocable
-   copyright license to reproduce, prepare Derivative Works of,
-   publicly display, publicly perform, sublicense, and distribute the
-   Work and such Derivative Works in Source or Object form.
-
-3. Grant of Patent License. Subject to the terms and conditions of
-   this License, each Contributor hereby grants to You a perpetual,
-   worldwide, non-exclusive, no-charge, royalty-free, irrevocable
-   (except as stated in this section) patent license to make, have made,
-   use, offer to sell, sell, import, and otherwise transfer the Work,
-   where such license applies only to those patent claims licensable
-   by such Contributor that are necessarily infringed by their
-   Contribution(s) alone or by combination of their Contribution(s)
-   with the Work to which such Contribution(s) was submitted. If You
-   institute patent litigation against any entity (including a
-   cross-claim or counterclaim in a lawsuit) alleging that the Work
-   or a Contribution incorporated within the Work constitutes direct
-   or contributory patent infringement, then any patent licenses
-   granted to You under this License for that Work shall terminate
-   as of the date such litigation is filed.
-
-4. Redistribution. You may reproduce and distribute copies of the
-   Work or Derivative Works thereof in any medium, with or without
-   modifications, and in Source or Object form, provided that You
-   meet the following conditions:
-
-   (a) You must give any other recipients of the Work or
-       Derivative Works a copy of this License; and
-
-   (b) You must cause any modified files to carry prominent notices
-       stating that You changed the files; and
-
-   (c) You must retain, in the Source form of any Derivative Works
-       that You distribute, all copyright, patent, trademark, and
-       attribution notices from the Source form of the Work,
-       excluding those notices that do not pertain to any part of
-       the Derivative Works; and
-
-   (d) If the Work includes a "NOTICE" text file as part of its
-       distribution, then any Derivative Works that You distribute must
-       include a readable copy of the attribution notices contained
-       within such NOTICE file, excluding those notices that do not
-       pertain to any part of the Derivative Works, in at least one
-       of the following places: within a NOTICE text file distributed
-       as part of the Derivative Works; within the Source form or
-       documentation, if provided along with the Derivative Works; or,
-       within a display generated by the Derivative Works, if and
-       wherever such third-party notices normally appear. The contents
-       of the NOTICE file are for informational purposes only and
-       do not modify the License. You may add Your own attribution
-       notices within Derivative Works that You distribute, alongside
-       or as an addendum to the NOTICE text from the Work, provided
-       that such additional attribution notices cannot be construed
-       as modifying the License.
-
-   You may add Your own copyright statement to Your modifications and
-   may provide additional or different license terms and conditions
-   for use, reproduction, or distribution of Your modifications, or
-   for any such Derivative Works as a whole, provided Your use,
-   reproduction, and distribution of the Work otherwise complies with
-   the conditions stated in this License.
-
-5. Submission of Contributions. Unless You explicitly state otherwise,
-   any Contribution intentionally submitted for inclusion in the Work
-   by You to the Licensor shall be under the terms and conditions of
-   this License, without any additional terms or conditions.
-   Notwithstanding the above, nothing herein shall supersede or modify
-   the terms of any separate license agreement you may have executed
-   with Licensor regarding such Contributions.
-
-6. Trademarks. This License does not grant permission to use the trade
-   names, trademarks, service marks, or product names of the Licensor,
-   except as required for reasonable and customary use in describing the
-   origin of the Work and reproducing the content of the NOTICE file.
-
-7. Disclaimer of Warranty. Unless required by applicable law or
-   agreed to in writing, Licensor provides the Work (and each
-   Contributor provides its Contributions) on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
-   implied, including, without limitation, any warranties or conditions
-   of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
-   PARTICULAR PURPOSE. You are solely responsible for determining the
-   appropriateness of using or redistributing the Work and assume any
-   risks associated with Your exercise of permissions under this License.
-
-8. Limitation of Liability. In no event and under no legal theory,
-   whether in tort (including negligence), contract, or otherwise,
-   unless required by applicable law (such as deliberate and grossly
-   negligent acts) or agreed to in writing, shall any Contributor be
-   liable to You for damages, including any direct, indirect, special,
-   incidental, or consequential damages of any character arising as a
-   result of this License or out of the use or inability to use the
-   Work (including but not limited to damages for loss of goodwill,
-   work stoppage, computer failure or malfunction, or any and all
-   other commercial damages or losses), even if such Contributor
-   has been advised of the possibility of such damages.
-
-9. Accepting Warranty or Additional Liability. While redistributing
-   the Work or Derivative Works thereof, You may choose to offer,
-   and charge a fee for, acceptance of support, warranty, indemnity,
-   or other liability obligations and/or rights consistent with this
-   License. However, in accepting such obligations, You may act only
-   on Your own behalf and on Your sole responsibility, not on behalf
-   of any other Contributor, and only if You agree to indemnify,
-   defend, and hold each Contributor harmless for any liability
-   incurred by, or claims asserted against, such Contributor by reason
-   of your accepting any such warranty or additional liability.
-
-END OF TERMS AND CONDITIONS
diff --git a/codecs/oxipng/LICENSE_MIT b/codecs/oxipng/LICENSE_MIT
deleted file mode 100644
index 7235cdc3..00000000
--- a/codecs/oxipng/LICENSE_MIT
+++ /dev/null
@@ -1,25 +0,0 @@
-Copyright (c) 2018 Surma <surma@surma.link>
-
-Permission is hereby granted, free of charge, to any
-person obtaining a copy of this software and associated
-documentation files (the "Software"), to deal in the
-Software without restriction, including without
-limitation the rights to use, copy, modify, merge,
-publish, distribute, sublicense, and/or sell copies of
-the Software, and to permit persons to whom the Software
-is furnished to do so, subject to the following
-conditions:
-
-The above copyright notice and this permission notice
-shall be included in all copies or substantial portions
-of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
-ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
-TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
-PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
-SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
-CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
-IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-DEALINGS IN THE SOFTWARE.
diff --git a/codecs/oxipng/pkg/README.md b/codecs/oxipng/pkg/README.md
new file mode 100644
index 00000000..806d28a9
--- /dev/null
+++ b/codecs/oxipng/pkg/README.md
@@ -0,0 +1,52 @@
+# 🦀🕸️ `wasm-pack-template`
+
+A template for kick starting a Rust and WebAssembly project using
+[`wasm-pack`](https://github.com/rustwasm/wasm-pack).
+
+This template is designed for compiling Rust libraries into WebAssembly and
+publishing the resulting package to NPM.
+
+* Want to use the published NPM package in a Website? [Check out
+  `create-wasm-app`.](https://github.com/rustwasm/create-wasm-app)
+* Want to make a monorepo-style Website without publishing to NPM? Check out
+  [`rust-webpack-template`](https://github.com/rustwasm/rust-webpack-template)
+  and/or
+  [`rust-parcel-template`](https://github.com/rustwasm/rust-parcel-template).
+
+## 🔋 Batteries Included
+
+* [`wasm-bindgen`](https://github.com/rustwasm/wasm-bindgen) for communicating
+  between WebAssembly and JavaScript.
+* [`console_error_panic_hook`](https://github.com/rustwasm/console_error_panic_hook)
+  for logging panic messages to the developer console.
+* [`wee_alloc`](https://github.com/rustwasm/wee_alloc), an allocator optimized
+  for small code size.
+
+## 🚴 Usage
+
+### 🐑 Use `cargo generate` to Clone this Template
+
+[Learn more about `cargo generate` here.](https://github.com/ashleygwilliams/cargo-generate)
+
+```
+cargo generate --git https://github.com/rustwasm/wasm-pack-template.git --name my-project
+cd my-project
+```
+
+### 🛠️ Build with `wasm-pack build`
+
+```
+wasm-pack build
+```
+
+### 🔬 Test in Headless Browsers with `wasm-pack test`
+
+```
+wasm-pack test --headless --firefox
+```
+
+### 🎁 Publish to NPM with `wasm-pack publish`
+
+```
+wasm-pack publish
+```
diff --git a/codecs/oxipng/pkg/img.png b/codecs/oxipng/pkg/img.png
new file mode 100644
index 00000000..2b779dff
Binary files /dev/null and b/codecs/oxipng/pkg/img.png differ
diff --git a/codecs/oxipng/pkg/lol.js b/codecs/oxipng/pkg/lol.js
new file mode 100644
index 00000000..8d266291
--- /dev/null
+++ b/codecs/oxipng/pkg/lol.js
@@ -0,0 +1,14 @@
+const oxipng = require("./oxipng_wasm");
+const repl = require("repl");
+const fs = require("fs");
+
+async function init() {
+  // const img = fs.readFileSync("img.png")
+  // const output = oxipng.compress(img, 0);
+  // fs.writeFileSync("output.png", output);
+  console.log(">>>", oxipng.doit());
+  const r = repl.start("node> ");
+  r.context.i = oxipng;
+}
+
+init();
diff --git a/codecs/oxipng/pkg/oxipng.d.ts b/codecs/oxipng/pkg/oxipng.d.ts
new file mode 100644
index 00000000..89caff8a
--- /dev/null
+++ b/codecs/oxipng/pkg/oxipng.d.ts
@@ -0,0 +1,3 @@
+/* tslint:disable */
+export function compress(arg0: Uint8Array, arg1: number): Uint8Array;
+
diff --git a/codecs/oxipng/pkg/oxipng.js b/codecs/oxipng/pkg/oxipng.js
new file mode 100644
index 00000000..6ab32270
--- /dev/null
+++ b/codecs/oxipng/pkg/oxipng.js
@@ -0,0 +1,73 @@
+/* tslint:disable */
+var wasm;
+
+const TextDecoder = require('util').TextDecoder;
+
+let cachedTextDecoder = new TextDecoder('utf-8');
+
+let cachegetUint8Memory = null;
+function getUint8Memory() {
+    if (cachegetUint8Memory === null || cachegetUint8Memory.buffer !== wasm.memory.buffer) {
+        cachegetUint8Memory = new Uint8Array(wasm.memory.buffer);
+    }
+    return cachegetUint8Memory;
+}
+
+function getStringFromWasm(ptr, len) {
+    return cachedTextDecoder.decode(getUint8Memory().subarray(ptr, ptr + len));
+}
+
+module.exports.__wbg_log_64e6f53d8e6d5db5 = function(arg0, arg1) {
+    let varg0 = getStringFromWasm(arg0, arg1);
+    console.log(varg0);
+};
+
+let WASM_VECTOR_LEN = 0;
+
+function passArray8ToWasm(arg) {
+    const ptr = wasm.__wbindgen_malloc(arg.length * 1);
+    getUint8Memory().set(arg, ptr / 1);
+    WASM_VECTOR_LEN = arg.length;
+    return ptr;
+}
+
+function getArrayU8FromWasm(ptr, len) {
+    return getUint8Memory().subarray(ptr / 1, ptr / 1 + len);
+}
+
+let cachedGlobalArgumentPtr = null;
+function globalArgumentPtr() {
+    if (cachedGlobalArgumentPtr === null) {
+        cachedGlobalArgumentPtr = wasm.__wbindgen_global_argument_ptr();
+    }
+    return cachedGlobalArgumentPtr;
+}
+
+let cachegetUint32Memory = null;
+function getUint32Memory() {
+    if (cachegetUint32Memory === null || cachegetUint32Memory.buffer !== wasm.memory.buffer) {
+        cachegetUint32Memory = new Uint32Array(wasm.memory.buffer);
+    }
+    return cachegetUint32Memory;
+}
+/**
+* @param {Uint8Array} arg0
+* @param {number} arg1
+* @returns {Uint8Array}
+*/
+module.exports.compress = function(arg0, arg1) {
+    const ptr0 = passArray8ToWasm(arg0);
+    const len0 = WASM_VECTOR_LEN;
+    const retptr = globalArgumentPtr();
+    wasm.compress(retptr, ptr0, len0, arg1);
+    const mem = getUint32Memory();
+    const rustptr = mem[retptr / 4];
+    const rustlen = mem[retptr / 4 + 1];
+
+    const realRet = getArrayU8FromWasm(rustptr, rustlen).slice();
+    wasm.__wbindgen_free(rustptr, rustlen * 1);
+    return realRet;
+
+};
+
+wasm = require('./oxipng_bg');
diff --git a/codecs/oxipng/pkg/oxipng_bg.d.ts b/codecs/oxipng/pkg/oxipng_bg.d.ts
new file mode 100644
index 00000000..102d9cce
--- /dev/null
+++ b/codecs/oxipng/pkg/oxipng_bg.d.ts
@@ -0,0 +1,6 @@
+/* tslint:disable */
+export const memory: WebAssembly.Memory;
+export function __wbindgen_global_argument_ptr(): number;
+export function compress(a: number, b: number, c: number, d: number): void;
+export function __wbindgen_malloc(a: number): number;
+export function __wbindgen_free(a: number, b: number): void;
diff --git a/codecs/oxipng/pkg/oxipng_bg.js b/codecs/oxipng/pkg/oxipng_bg.js
new file mode 100644
index 00000000..b9f39465
--- /dev/null
+++ b/codecs/oxipng/pkg/oxipng_bg.js
@@ -0,0 +1,9 @@
+
+const path = require('path').join(__dirname, 'oxipng_bg.wasm');
+const bytes = require('fs').readFileSync(path);
+let imports = {};
+imports['./oxipng'] = require('./oxipng');
+
+const wasmModule = new WebAssembly.Module(bytes);
+const wasmInstance = new WebAssembly.Instance(wasmModule, imports);
+module.exports = wasmInstance.exports;
diff --git a/codecs/oxipng/pkg/oxipng_bg.wasm b/codecs/oxipng/pkg/oxipng_bg.wasm
new file mode 100644
index 00000000..739ed9e9
Binary files /dev/null and b/codecs/oxipng/pkg/oxipng_bg.wasm differ
diff --git a/codecs/oxipng/pkg/oxipng_manual.d.ts b/codecs/oxipng/pkg/oxipng_manual.d.ts
new file mode 100644
index 00000000..eaf3bc58
--- /dev/null
+++ b/codecs/oxipng/pkg/oxipng_manual.d.ts
@@ -0,0 +1,3 @@
+/* tslint:disable */
+export function compress(arg0: Uint8Array, arg1: number): Promise<Uint8Array>;
+
diff --git a/codecs/oxipng/pkg/oxipng_manual.js b/codecs/oxipng/pkg/oxipng_manual.js
new file mode 100644
index 00000000..4da46dd5
--- /dev/null
+++ b/codecs/oxipng/pkg/oxipng_manual.js
@@ -0,0 +1,77 @@
+/* tslint:disable */
+import wasmUrl from './oxipng_bg.wasm';
+
+let wasm;
+const instancePromise = WebAssembly.instantiateStreaming(fetch(wasmUrl), {
+  "./oxipng": {__wbg_log_64e6f53d8e6d5db5}
+});
+
+let cachedTextDecoder = new TextDecoder('utf-8');
+
+let cachegetUint8Memory = null;
+function getUint8Memory() {
+    if (cachegetUint8Memory === null || cachegetUint8Memory.buffer !== wasm.memory.buffer) {
+        cachegetUint8Memory = new Uint8Array(wasm.memory.buffer);
+    }
+    return cachegetUint8Memory;
+}
+
+function getStringFromWasm(ptr, len) {
+    return cachedTextDecoder.decode(getUint8Memory().subarray(ptr, ptr + len));
+}
+
+export function __wbg_log_64e6f53d8e6d5db5(arg0, arg1) {
+    let varg0 = getStringFromWasm(arg0, arg1);
+    console.log(varg0);
+}
+
+let WASM_VECTOR_LEN = 0;
+
+function passArray8ToWasm(arg) {
+    const ptr = wasm.__wbindgen_malloc(arg.length * 1);
+    getUint8Memory().set(arg, ptr / 1);
+    WASM_VECTOR_LEN = arg.length;
+    return ptr;
+}
+
+function getArrayU8FromWasm(ptr, len) {
+    return getUint8Memory().subarray(ptr / 1, ptr / 1 + len);
+}
+
+let cachedGlobalArgumentPtr = null;
+function globalArgumentPtr() {
+    if (cachedGlobalArgumentPtr === null) {
+        cachedGlobalArgumentPtr = wasm.__wbindgen_global_argument_ptr();
+    }
+    return cachedGlobalArgumentPtr;
+}
+
+let cachegetUint32Memory = null;
+function getUint32Memory() {
+    if (cachegetUint32Memory === null || cachegetUint32Memory.buffer !== wasm.memory.buffer) {
+        cachegetUint32Memory = new Uint32Array(wasm.memory.buffer);
+    }
+    return cachegetUint32Memory;
+}
+/**
+* @param {Uint8Array} arg0
+* @param {number} arg1
+* @returns {Uint8Array}
+*/
+export async function compress(arg0, arg1) {
+    wasm = (await instancePromise).instance.exports;
+    debugger;
+    const ptr0 = passArray8ToWasm(arg0);
+    const len0 = WASM_VECTOR_LEN;
+    const retptr = globalArgumentPtr();
+    wasm.compress(retptr, ptr0, len0, arg1);
+    const mem = getUint32Memory();
+    const rustptr = mem[retptr / 4];
+    const rustlen = mem[retptr / 4 + 1];
+
+    const realRet = getArrayU8FromWasm(rustptr, rustlen).slice();
+    wasm.__wbindgen_free(rustptr, rustlen * 1);
+    return realRet;
+
+}
+
diff --git a/codecs/oxipng/pkg/oxipng_wasm.d.ts b/codecs/oxipng/pkg/oxipng_wasm.d.ts
new file mode 100644
index 00000000..7e179612
--- /dev/null
+++ b/codecs/oxipng/pkg/oxipng_wasm.d.ts
@@ -0,0 +1,3 @@
+/* tslint:disable */
+export function doit(): number;
+
diff --git a/codecs/oxipng/pkg/oxipng_wasm.js b/codecs/oxipng/pkg/oxipng_wasm.js
new file mode 100644
index 00000000..a1326495
--- /dev/null
+++ b/codecs/oxipng/pkg/oxipng_wasm.js
@@ -0,0 +1,11 @@
+/* tslint:disable */
+var wasm;
+
+/**
+* @returns {number}
+*/
+module.exports.doit = function() {
+    return wasm.doit();
+};
+
+wasm = require('./oxipng_wasm_bg');
diff --git a/codecs/oxipng/pkg/oxipng_wasm_bg.d.ts b/codecs/oxipng/pkg/oxipng_wasm_bg.d.ts
new file mode 100644
index 00000000..de4f3436
--- /dev/null
+++ b/codecs/oxipng/pkg/oxipng_wasm_bg.d.ts
@@ -0,0 +1,3 @@
+/* tslint:disable */
+export const memory: WebAssembly.Memory;
+export function doit(): number;
diff --git a/codecs/oxipng/pkg/oxipng_wasm_bg.js b/codecs/oxipng/pkg/oxipng_wasm_bg.js
new file mode 100644
index 00000000..8e41ec05
--- /dev/null
+++ b/codecs/oxipng/pkg/oxipng_wasm_bg.js
@@ -0,0 +1,8 @@
+
+const path = require('path').join(__dirname, 'oxipng_wasm_bg.wasm');
+const bytes = require('fs').readFileSync(path);
+let imports = {};
+
+const wasmModule = new WebAssembly.Module(bytes);
+const wasmInstance = new WebAssembly.Instance(wasmModule, imports);
+module.exports = wasmInstance.exports;
diff --git a/codecs/oxipng/pkg/oxipng_wasm_bg.wasm b/codecs/oxipng/pkg/oxipng_wasm_bg.wasm
new file mode 100644
index 00000000..9bf58244
Binary files /dev/null and b/codecs/oxipng/pkg/oxipng_wasm_bg.wasm differ
diff --git a/codecs/oxipng/pkg/package.json b/codecs/oxipng/pkg/package.json
new file mode 100644
index 00000000..629a03df
--- /dev/null
+++ b/codecs/oxipng/pkg/package.json
@@ -0,0 +1,15 @@
+{
+  "name": "oxipng-wasm",
+  "collaborators": [
+    "Surma <surma@surma.link>"
+  ],
+  "version": "0.1.0",
+  "files": [
+    "oxipng_wasm_bg.wasm",
+    "oxipng_wasm.js",
+    "oxipng_wasm_bg.js",
+    "oxipng_wasm.d.ts"
+  ],
+  "main": "oxipng_wasm.js",
+  "types": "oxipng_wasm.d.ts"
+}
\ No newline at end of file
diff --git a/codecs/oxipng/pkg/test/lol.rs b/codecs/oxipng/pkg/test/lol.rs
new file mode 100644
index 00000000..e69de29b
diff --git a/codecs/oxipng/src/lib.rs b/codecs/oxipng/src/lib.rs
index 2758a22e..38b9287a 100644
--- a/codecs/oxipng/src/lib.rs
+++ b/codecs/oxipng/src/lib.rs
@@ -1,12 +1,12 @@
 extern crate cfg_if;
 extern crate wasm_bindgen;
-extern crate oxipng;
+// extern crate oxipng;
 
 mod utils;
 
 use cfg_if::cfg_if;
 use wasm_bindgen::prelude::*;
-
+use std::time::{Instant};
 cfg_if! {
     // When the `wee_alloc` feature is enabled, use `wee_alloc` as the global
     // allocator.
@@ -17,17 +17,34 @@ cfg_if! {
     }
 }
 
-#[wasm_bindgen]
-extern {
-  #[wasm_bindgen(js_namespace = console)]
-  fn log(s: &str);
+// #[wasm_bindgen]
+// extern {
+//   #[wasm_bindgen(js_namespace = console)]
+//   fn log(s: &str);
+// }
+
+// #[wasm_bindgen]
+// pub fn compress(img: Vec<u8>, level: u8) -> Vec<u8> {
+//   log(&format!("len: {}, level: {}", img.len(), level));
+//   let mut options = oxipng::Options::from_preset(level);
+//   options.threads = 0;
+//   let result = oxipng::optimize_from_memory(img.as_slice(), &options);
+//   match result {
+//     Ok(v) => v,
+//     Err(e) => e.to_string().as_bytes().to_vec()
+//   }
+// }
+
+pub fn rust_wasm_syscall(index: usize, _data: *mut ()) -> usize {
+  if index == 6 {
+    1
+  } else {
+    0
+  }
 }
 
 #[wasm_bindgen]
-pub fn compress(img: Vec<u8>, level: u8) -> Vec<u8> {
-  log(&format!("len: {}, level: {}", img.len(), level));
-  let mut options = oxipng::Options::from_preset(level);
-  options.threads = 0;
-  let result = oxipng::optimize_from_memory(img.as_slice(), &options);
-  result.unwrap()
+pub fn doit() -> u32 {
+  let start = Instant::now();
+  start.elapsed().as_secs() as u32
 }
diff --git a/codecs/oxipng/tests/web.rs b/codecs/oxipng/tests/web.rs
deleted file mode 100644
index de5c1daf..00000000
--- a/codecs/oxipng/tests/web.rs
+++ /dev/null
@@ -1,13 +0,0 @@
-//! Test suite for the Web and headless browsers.
-
-#![cfg(target_arch = "wasm32")]
-
-extern crate wasm_bindgen_test;
-use wasm_bindgen_test::*;
-
-wasm_bindgen_test_configure!(run_in_browser);
-
-#[wasm_bindgen_test]
-fn pass() {
-    assert_eq!(1 + 1, 2);
-}