first

.eslintignore

+webpack.config.js
+dist/*
+build/*
+*.js

.eslintrc.js

+module.exports = {
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    project: 'tsconfig.json',
+    tsconfigRootDir : __dirname, 
+    sourceType: 'module',
+  },
+  plugins: ['@typescript-eslint/eslint-plugin'],
+  extends: [
+    'plugin:@typescript-eslint/recommended',
+    'plugin:prettier/recommended',
+  ],
+  root: true,
+  env: {
+    node: true,
+    jest: true,
+  },
+  ignorePatterns: ['.eslintrc.js'],
+  rules: {
+    '@typescript-eslint/interface-name-prefix': 'off',
+    '@typescript-eslint/explicit-function-return-type': 'off',
+    '@typescript-eslint/explicit-module-boundary-types': 'off',
+    '@typescript-eslint/no-explicit-any': 'off',
+  },
+};

.gitignore

+# compiled output
+/dist
+/node_modules
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# OS
+.DS_Store
+
+# Tests
+/coverage
+/.nyc_output
+
+# IDEs and editors
+/.idea
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# IDE - VSCode
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+
+/data
+/output
+/config.yaml

.gitlab-ci.yml

+stages:
+  - install
+  - build
+  - deploy
+
+variables:
+  GIT_DEPTH: "1"
+
+npm_ci:
+  stage: install
+  tags:
+    - linux
+  script:
+    - npm ci
+  artifacts:
+    paths:
+      - node_modules
+
+.build_base:
+  stage: build
+  tags:
+    - linux
+  dependencies:
+    - npm_ci
+
+build:
+  extends:
+    - .build_base
+  script:
+    - npm run build
+  artifacts:
+    paths:
+      - dist/
+
+unit-test:
+  extends:
+    - .build_base
+  script:
+    - npm run test
+
+deploy_npm:
+  stage: deploy
+  dependencies:
+    - build
+  tags:
+    - linux
+  script:
+    - apt update;apt -y install coreutils
+    - echo $NPMRC | base64 --decode > ~/.npmrc
+    - npm publish . --access public && curl -X PUT "https://registry-direct.npmmirror.com/$(cat package.json | jq '.name' | sed 's/\"//g')/sync?sync_upstream=true" || true
+  only:
+    - master

.npmignore

+/install-npm.sh
+.git*
+/data
+/output
+/config.yaml
+.idea
+.dockerignore
+Dockerfile
+/src
+/coverage
+/tests
+/dist/tests

.prettierrc

+{
+  "singleQuote": true,
+  "trailingComma": "all"
+}
\ No newline at end of file

LICENSE

+The MIT License (MIT)
+
+Copyright (c) 2021 Nanahira
+
+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.
+

README.md

 # ygopro-deck-encode
 
-YGOPro Deck encode and decode, with well-browser support.
\ No newline at end of file
+YGOPro Deck encode and decode, with well-browser support.
+
+## Usage
+
+```ts
+const deck = new YGOProDeck();
+// main: number[]
+// extra: number[]
+// side: number[]
+
+const code = deck.toEncodedString(); // base64url-encoded deck code
+const anotherDeck = YGOProDeck.fromEncodedString(code); // decode it back
+
+const ydk = deck.toYdkString(); // YDK format
+const yetAnotherDeck = YGOProDeck.fromYdkString(ydk); // decode it back
+```
+
+
+## Encode format
+
+The deck code is a base64url-encoded string, which is an unsigned 32-bit integer array, each number representing a card
+
+- 28 bits: card ID
+- 2 bits: card type
+  - 0: main deck
+  - 1: extra deck
+  - 2: side deck
+- 2 bits: card count - 1. a.k.a. 0 means 1, 1 means 2, 2 means 3, 3 means 4

index.ts

+import { countItems } from './src/utils';
+import { Base64 } from 'js-base64';
+
+export default class YGOProDeck {
+  main: number[] = [];
+  extra: number[] = [];
+  side: number[] = [];
+
+  private sort() {
+    this.main.sort();
+    this.extra.sort();
+    this.side.sort();
+  }
+
+  bufferLength() {
+    const counted = [this.main, this.extra, this.side].map(countItems);
+    return counted.reduce((a, b) => a + b.size * 4, 0);
+  }
+
+  toEncodedString() {
+    const counted = [this.main, this.extra, this.side].map(countItems);
+    const buf = new Uint8Array(counted.reduce((a, b) => a + b.size * 4, 0));
+    let pointer = 0;
+    const writeUint32LE = (value: number) => {
+      buf[pointer++] = value & 0xff;
+      buf[pointer++] = (value >> 8) & 0xff;
+      buf[pointer++] = (value >> 16) & 0xff;
+      buf[pointer++] = (value >> 24) & 0xff;
+    };
+    const writeCards = (countMap: Map<number, number>, type: number) => {
+      // each card: 28 bits for id, 2 bits(0, 1, 2, 3) for type(0: main, 1: extra, 2: side, 3: unknown), 2 bits for count (0: 1, 1: 2, 2: 3, 3: 4)
+      for (const [id, count] of countMap.entries()) {
+        if (count > 4) {
+          throw new Error(`Too many cards: ${id}`);
+        }
+        const value = (id & 0xfffffff) | (type << 28) | ((count - 1) << 30);
+        writeUint32LE(value);
+      }
+    };
+    counted.forEach(writeCards);
+    return Base64.fromUint8Array(buf, true);
+  }
+
+  toString() {
+    return this.toEncodedString();
+  }
+
+  fromEncodedString(str: string) {
+    const buf = Base64.toUint8Array(str);
+    for (let i = 0; i < buf.length - 3; i += 4) {
+      const value =
+        buf[i] | (buf[i + 1] << 8) | (buf[i + 2] << 16) | (buf[i + 3] << 24);
+      const id = value & 0xfffffff;
+      const type = (value >> 28) & 0x3;
+      const count = ((value >> 30) & 0x3) + 1;
+      const cards = [this.main, this.extra, this.side][type];
+      for (let j = 0; j < count; j++) {
+        cards.push(id);
+      }
+    }
+    this.sort();
+    return this;
+  }
+
+  static fromEncodedString(str: string) { 
+    return new YGOProDeck().fromEncodedString(str);
+  }
+
+  toYdkString() {
+    return [
+      '#created by ygopro-deck-encode',
+      '#main',
+      ...this.main.map((id) => id.toString()),
+      '#extra',
+      ...this.extra.map((id) => id.toString()),
+      '!side',
+      ...this.side.map((id) => id.toString()),
+    ].join('\n');
+  }
+
+  fromYdkString(str: string) {
+    const lines = str.split('\n');
+    let current = this.main;
+    for (const _line of lines) {
+      const line = _line.trim();
+      if (line === '#main') {
+        current = this.main;
+      }
+      if (line === '#extra') {
+        current = this.extra;
+      }
+      if (line === '!side') {
+        current = this.side;
+      }
+      if (line.match(/^\d+$/)) {
+        current.push(parseInt(line, 10));
+      }
+    }
+    this.sort();
+    return this;
+  }
+
+  static fromYdkString(str: string) {
+    return new YGOProDeck().fromYdkString(str);
+  }
+}

package.json

+{
+  "name": "myproject",
+  "description": "myproject-desc",
+  "version": "1.0.0",
+  "main": "dist/index.cjs",
+  "module": "dist/index.mjs",
+  "types": "dist/index.d.ts",
+  "scripts": {
+    "lint": "eslint --fix .",
+    "compile:cjs": "esbuild index.ts --outfile=dist/index.cjs --bundle --sourcemap --platform=node --target=es2019 --external:js-base64",
+    "compile:esm": "esbuild index.ts --outfile=dist/index.mjs --bundle --sourcemap --platform=neutral --target=esnext --external:js-base64",
+    "compile:types": "tsc --emitDeclarationOnly --declaration",
+    "build": "rimraf dist && npm run compile:cjs && npm run compile:esm && npm run compile:types",
+    "test": "jest --passWithNoTests",
+    "start": "node dist/index.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://code.mycard.moe/3rdeye/myproject.git"
+  },
+  "author": "Nanahira <nanahira@momobako.com>",
+  "license": "MIT",
+  "keywords": [],
+  "bugs": {
+    "url": "https://code.mycard.moe/3rdeye/myproject/issues"
+  },
+  "homepage": "https://code.mycard.moe/3rdeye/myproject",
+  "jest": {
+    "moduleFileExtensions": [
+      "js",
+      "json",
+      "ts"
+    ],
+    "rootDir": "tests",
+    "testRegex": ".*\\.spec\\.ts$",
+    "transform": {
+      "^.+\\.(t|j)s$": "ts-jest"
+    },
+    "collectCoverageFrom": [
+      "**/*.(t|j)s"
+    ],
+    "coverageDirectory": "../coverage",
+    "testEnvironment": "node"
+  },
+  "devDependencies": {
+    "@types/jest": "^29.4.0",
+    "@types/node": "^18.13.0",
+    "@typescript-eslint/eslint-plugin": "^5.51.0",
+    "@typescript-eslint/parser": "^5.51.0",
+    "esbuild": "^0.17.7",
+    "esbuild-register": "^3.4.2",
+    "eslint": "8.22.0",
+    "eslint-config-prettier": "^8.6.0",
+    "eslint-plugin-prettier": "^4.2.1",
+    "jest": "^29.4.2",
+    "prettier": "^2.8.4",
+    "rimraf": "^4.1.2",
+    "ts-jest": "^29.0.5",
+    "typescript": "^4.9.5"
+  },
+  "dependencies": {
+    "js-base64": "^3.7.5"
+  }
+}

src/utils.ts

+export function countItems<T>(arr: T[]) {
+  const map = new Map<T, number>();
+  for (const item of arr) {
+    map.set(item, (map.get(item) || 0) + 1);
+  }
+  return map;
+}

tests/sample.spec.ts

+import YGOProDeck from '..';
+
+const deck = new YGOProDeck();
+deck.main.push(123);
+deck.main.push(123);
+deck.main.push(123);
+deck.main.push(456);
+deck.main.push(456);
+deck.main.push(789);
+deck.extra.push(1234);
+deck.extra.push(5678);
+deck.side.push(12345);
+
+describe('Sample test.', () => {
+  it('should encode and decode deck string', () => {
+    const encoded = deck.toEncodedString();
+    const buf = Buffer.from(
+      encoded.replace(/[-_]/g, (m0) => (m0 == '-' ? '+' : '/')),
+      'base64',
+    );
+    expect(buf.length).toBe(24);
+    const decoded = new YGOProDeck().fromEncodedString(encoded);
+    expect(decoded.main).toStrictEqual(deck.main);
+    expect(decoded.extra).toStrictEqual(deck.extra);
+    expect(decoded.side).toStrictEqual(deck.side);
+  });
+  it('should encode and decode ydk text', () => {
+    const ydk = deck.toYdkString();
+    console.log(ydk);
+    expect(ydk.split('\n')).toHaveLength(13);
+    const decoded = new YGOProDeck().fromYdkString(ydk);
+    expect(decoded.main).toStrictEqual(deck.main);
+    expect(decoded.extra).toStrictEqual(deck.extra);
+    expect(decoded.side).toStrictEqual(deck.side);
+  })
+});

tsconfig.json

+{
+	"compilerOptions": {
+		"outDir": "dist",
+		"module": "commonjs",
+		"target": "es2021",
+		"esModuleInterop": true,
+		"emitDecoratorMetadata": true,
+		"experimentalDecorators": true,
+		"declaration": true,
+		"sourceMap": true
+	},
+	"compileOnSave": true,
+	"allowJs": true,
+	"include": [
+		"*.ts",
+		"src/**/*.ts",
+		"test/**/*.ts",
+		"tests/**/*.ts"
+	]
+}