first

.dockerignore

+# 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
+
+.git*
+Dockerfile
+.dockerignore
+/tests

.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.docker.yml

+stages:
+  - build
+  - deploy
+variables:
+  GIT_DEPTH: "1"
+
+before_script:
+  - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+
+.build-image:
+  stage: build
+  script:
+    - docker build --pull -t $TARGET_IMAGE .
+    - docker push $TARGET_IMAGE
+
+build-x86:
+  extends: .build-image
+  tags:
+    - docker
+  variables:
+    TARGET_IMAGE: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG-x86
+
+build-arm:
+  extends: .build-image
+  tags:
+    - docker-arm
+  variables:
+    TARGET_IMAGE: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG-arm
+
+.deploy:
+  stage: deploy
+  tags:
+    - docker
+  script:
+    - docker pull $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG-x86
+    - docker pull $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG-arm
+    - docker manifest create $TARGET_IMAGE --amend $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG-x86 --amend
+      $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG-arm
+    - docker manifest push $TARGET_IMAGE
+
+deploy_latest:
+  extends: .deploy
+  variables:
+    TARGET_IMAGE: $CI_REGISTRY_IMAGE:latest
+  only:
+    - master
+
+deploy_branch:
+  extends: .deploy
+  variables:
+    TARGET_IMAGE: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG

.gitlab-ci.upload.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/
+
+upload_to_minio:
+  stage: deploy
+  dependencies:
+    - build
+  tags:
+    - linux
+  script:
+    - aws s3 --endpoint=https://minio.momobako.com:9000 sync --delete dist/ s3://nanahira/path
+  only:
+    - master

.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

Dockerfile

+FROM node:lts-trixie-slim as base
+LABEL Author="Nanahira <nanahira@momobako.com>"
+
+RUN apt update && apt -y install python3 build-essential && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* /var/log/*
+WORKDIR /usr/src/app
+COPY ./package*.json ./
+
+FROM base as builder
+RUN npm ci && npm cache clean --force
+COPY . ./
+RUN npm run build
+
+FROM base
+ENV NODE_ENV production
+RUN npm ci && npm cache clean --force
+COPY --from=builder /usr/src/app/dist ./dist
+
+CMD [ "npm", "start" ]

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

+# nfkit
+
+Common kits
\ No newline at end of file

index.ts

+export * from './src/workflow';

install-npm.sh

+#!/bin/bash
+
+npm i --save-exact --save-dev eslint@8.22.0
+npm install --save-dev \
+	@types/node \
+	typescript \
+	'@typescript-eslint/eslint-plugin@^6.0.0' \
+	'@typescript-eslint/parser@^6.0.0 '\
+	'eslint-config-prettier@^9.0.0' \
+	'eslint-plugin-prettier@^5.0.0' \
+	prettier \
+	jest \
+	@types/jest \
+	ts-jest \
+	rimraf

package.json

+{
+  "name": "nfkit",
+  "description": "Common kits",
+  "version": "1.0.0",
+  "main": "dist/index.js",
+  "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.moenext.com/nanahira/nfkit.git"
+  },
+  "author": "Nanahira <nanahira@momobako.com>",
+  "license": "MIT",
+  "keywords": [],
+  "bugs": {
+    "url": "https://code.moenext.com/nanahira/nfkit/issues"
+  },
+  "homepage": "https://code.moenext.com/nanahira/nfkit",
+  "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": "^30.0.0",
+    "@types/node": "^24.9.1",
+    "@typescript-eslint/eslint-plugin": "^6.21.0",
+    "@typescript-eslint/parser": "^6.21.0",
+    "esbuild": "^0.25.11",
+    "esbuild-register": "^3.6.0",
+    "eslint": "8.22.0",
+    "eslint-config-prettier": "^9.1.2",
+    "eslint-plugin-prettier": "^5.5.4",
+    "jest": "^30.2.0",
+    "prettier": "^3.6.2",
+    "rimraf": "^6.0.1",
+    "ts-jest": "^29.4.5",
+    "typescript": "^5.9.3"
+  }
+}

src/workflow.ts

+// ========== 类型工具 ==========
+type AwaitedLike<T> = T extends Promise<infer R> ? R : T;
+type AnyFn = (...args: any[]) => any;
+
+type Chain<T> = Promise<AwaitedLike<T>> &
+  (T extends AnyFn
+    ? (...a: Parameters<T>) => Chain<AwaitedLike<ReturnType<T>>>
+    : {}) & {
+    [K in keyof T]: T[K] extends (...a: infer A) => infer R
+      ? (...a: A) => Chain<AwaitedLike<R>>
+      : Chain<AwaitedLike<T[K]>>;
+  };
+
+// ========== 核心：不可变节点 ==========
+class Node {
+  private memo?: Promise<any>;
+  constructor(
+    private readonly source: any, // 只有根节点有意义；子节点可复用根的 source
+    private readonly parent: Node | null, // 前缀
+    private readonly op: ((x: any) => any) | null, // 从 parent 结果到本节点结果的变换
+  ) {}
+
+  run(): Promise<any> {
+    if (!this.memo) {
+      this.memo = (async () => {
+        if (!this.parent) {
+          // 根：把 source 解一次即可
+          return await this.source;
+        }
+        // 先拿到父节点结果（会记忆化）
+        const base = await this.parent.run();
+        // 应用本节点的变换（允许返回同步或异步）
+        return this.op ? this.op(base) : base;
+      })();
+    }
+    return this.memo;
+  }
+
+  // 工厂：衍生子节点（分叉 = 复用同一个 parent）
+  child(op: (x: any) => any): Node {
+    return new Node(this.source, this, op);
+  }
+
+  // 拿到“相同节点”的句柄（显式 fork）
+  fork(): Node {
+    return new Node(this.source, this.parent, this.op);
+  }
+}
+
+// ========== 对外 API：workflow ==========
+export function workflow<T>(source: T | Promise<T>): Chain<T> {
+  const root = new Node(source, null, null);
+  return makeProxy<T>(root) as any;
+}
+
+// ========== 代理层：把 Node 暴露成链式 API ==========
+function makeProxy<T>(node: Node): Chain<T> {
+  const runOnce = () => node.run(); // 记忆化在 Node 内部
+
+  const rootHandler: ProxyHandler<any> = {
+    get(_t, prop) {
+      // 结束信号：所有 then/catch/finally 复用同一个 Promise
+      if (prop === 'then')
+        return (res: any, rej?: any) => runOnce().then(res, rej);
+      if (prop === 'catch') return (rej: any) => runOnce().catch(rej);
+      if (prop === 'finally') return (fin: any) => runOnce().finally(fin);
+
+      // 访问一个属性：生成一个“Get”子节点，但不执行
+      return linkProxy(prop);
+    },
+    // 支持对“当前值”直接二次调用： foo()()
+    apply(_t, _this, argArray) {
+      const child = node.child((cur: any) => {
+        if (typeof cur !== 'function')
+          throw new TypeError('Current value is not callable');
+        return cur(...argArray);
+      });
+      return makeProxy<any>(child);
+    },
+  };
+
+  const linkProxy = (prop: PropertyKey) =>
+    new Proxy(function () {}, {
+      // 把 “.foo(…args)” 记录为 Call
+      apply(_t, _this, argArray) {
+        const child = node.child((cur: any) => {
+          const fn = (cur as any)[prop];
+          if (typeof fn !== 'function') {
+            throw new TypeError(`${String(prop)} is not a function`);
+          }
+          return fn.apply(cur, argArray);
+        });
+        return makeProxy<any>(child);
+      },
+      // 把 “.bar” 记录为 Get；继续深入时在这个 Get 的结果上再处理
+      get(_t, next) {
+        if (next === 'then')
+          return (r: any, j?: any) =>
+            node
+              .child((cur: any) => (cur as any)[prop])
+              .run()
+              .then(r, j);
+        if (next === 'catch')
+          return (rej: any) =>
+            node
+              .child((cur: any) => (cur as any)[prop])
+              .run()
+              .catch(rej);
+        if (next === 'finally')
+          return (fin: any) =>
+            node
+              .child((cur: any) => (cur as any)[prop])
+              .run()
+              .finally(fin);
+
+        const child = node.child((cur: any) => (cur as any)[prop]);
+        return (makeProxy as any)(child)[next];
+      },
+    });
+
+  return new Proxy(function () {}, rootHandler) as any;
+}

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"
+	]
+}