diff --git a/.gitignore b/.gitignore
index 2ad53959..d17bcb23 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,3 +10,158 @@ report.html
 /screenshot/*
 sample/index.html
 from-json.html
+### Generated by gibo (https://github.com/simonwhitaker/gibo)
+### https://raw.github.com/github/gitignore/e5323759e387ba347a9d50f8b0ddd16502eb71d4/Node.gitignore
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional stylelint cache
+.stylelintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+.temp
+.cache
+
+# Docusaurus cache and generated files
+.docusaurus
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*
+
+
+### https://raw.github.com/github/gitignore/e5323759e387ba347a9d50f8b0ddd16502eb71d4/Rust.gitignore
+
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+wasi-sdk-21.0
+m.md
+
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 00000000..9bcceb87
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,5 @@
+[workspace]
+resolver = "2"
+members = [
+    "core",
+]
\ No newline at end of file
diff --git a/core/Cargo.toml b/core/Cargo.toml
new file mode 100644
index 00000000..3fa94b11
--- /dev/null
+++ b/core/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "core"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+image-diff-rs = { git = "https://github.com/bokuweb/image-diff-rs.git" }
+globmatch = "0.3"
+rayon = "1.8"
+
+[dev-dependencies]
+rstest = "0.18.2"
\ No newline at end of file
diff --git a/core/examples/simple.rs b/core/examples/simple.rs
new file mode 100644
index 00000000..365085c0
--- /dev/null
+++ b/core/examples/simple.rs
@@ -0,0 +1,5 @@
+use core::run;
+
+pub fn main() {
+    run("./sample/actual/", "./sample/expected")
+}
diff --git a/core/src/lib.rs b/core/src/lib.rs
new file mode 100644
index 00000000..9bcb36ef
--- /dev/null
+++ b/core/src/lib.rs
@@ -0,0 +1,120 @@
+// type RegParams = {
+//     actualDir: string,
+//     expectedDir: string,
+//     diffDir: string,
+//     report?: string,
+//     junitReport?: string,
+//     json?: string,
+//     update?: boolean,
+//     extendedErrors?: boolean,
+//     urlPrefix?: string,
+//     matchingThreshold?: number,
+//     threshold?: number, // alias to thresholdRate.
+//     thresholdRate?: number,
+//     thresholdPixel?: number,
+//     concurrency?: number,
+//     enableAntialias?: boolean,
+//     enableClientAdditionalDetection?: boolean,
+//   };
+// fn main() {
+//     // let a = include_bytes!("../../sample/actual/sample.png");
+//     // let b = include_bytes!("../../sample/expected/sample.png");
+//     // image_diff_rs::diff(
+//     //     a,
+//     //     b,
+//     //     &image_diff_rs::DiffOption {
+//     //         threshold: Some(0.1),
+//     //         include_anti_alias: Some(true),
+//     //     },
+//     // )
+//     // .unwrap();
+//     // crate::run();
+// }
+//
+
+use image_diff_rs::DiffOption;
+use rayon::prelude::*;
+use std::{
+    collections::BTreeSet,
+    path::{Path, PathBuf},
+};
+
+static IMAGE_FILES: &str = "/**/*.{tiff,jpeg,jpg,gif,png,bmp,webp}";
+
+#[derive(Debug)]
+pub(crate) struct DetectedImages {
+    pub(crate) expected: BTreeSet<PathBuf>,
+    pub(crate) actual: BTreeSet<PathBuf>,
+    pub(crate) deleted: BTreeSet<PathBuf>,
+    pub(crate) new: BTreeSet<PathBuf>,
+}
+
+pub fn run(expected_dir: impl AsRef<Path>, actual_dir: impl AsRef<Path>) {
+    let actual_dir = actual_dir.as_ref().to_owned();
+    let expected_dir = expected_dir.as_ref().to_owned();
+    let detected = find_images(&expected_dir, &actual_dir);
+
+    let targets: Vec<PathBuf> = detected
+        .actual
+        .intersection(&detected.expected)
+        .cloned()
+        .collect();
+
+    let results: Result<Vec<()>, std::io::Error> = targets
+        .par_iter()
+        .map(|path| {
+            let img1 = std::fs::read(actual_dir.clone().join(path))?;
+            let img2 = std::fs::read(expected_dir.clone().join(path))?;
+            let res = image_diff_rs::diff(
+                img1,
+                img2,
+                &DiffOption {
+                    threshold: Some(0.05),
+                    include_anti_alias: Some(true),
+                },
+            );
+            std::fs::write("./test.png", res.unwrap().diff_image)?;
+            Ok(())
+        })
+        .inspect(|r| if let Err(e) = r { /*TODO: logging */ })
+        .collect();
+}
+
+pub(crate) fn find_images(
+    expected_dir: impl AsRef<Path>,
+    actual_dir: impl AsRef<Path>,
+) -> DetectedImages {
+    let expected_dir = expected_dir.as_ref();
+    let actual_dir = actual_dir.as_ref();
+
+    let expected: BTreeSet<PathBuf> =
+        globmatch::Builder::new(&(expected_dir.display().to_string() + IMAGE_FILES))
+            .build(".")
+            .expect("the pattern should be correct.")
+            .into_iter()
+            .flatten()
+            .map(|p| p.strip_prefix(expected_dir).unwrap().to_path_buf())
+            .collect();
+
+    let actual: BTreeSet<PathBuf> =
+        globmatch::Builder::new(&(actual_dir.display().to_string() + IMAGE_FILES))
+            .build(".")
+            .expect("the pattern should be correct.")
+            .into_iter()
+            .flatten()
+            .map(|p| p.strip_prefix(actual_dir).unwrap().to_path_buf())
+            .collect();
+
+    dbg!(&expected);
+
+    let deleted = expected.difference(&actual).cloned().collect();
+
+    let new = actual.difference(&expected).cloned().collect();
+
+    DetectedImages {
+        expected,
+        actual,
+        deleted,
+        new,
+    }
+}
diff --git a/core/src/main.rs b/core/src/main.rs
new file mode 100644
index 00000000..365085c0
--- /dev/null
+++ b/core/src/main.rs
@@ -0,0 +1,5 @@
+use core::run;
+
+pub fn main() {
+    run("./sample/actual/", "./sample/expected")
+}