├── .github └── workflows │ └── ci.yml ├── .gitignore ├── .release-please-manifest.json ├── CHANGELOG.md ├── LICENSE ├── README.md ├── eslint.config.mjs ├── jest.config.js ├── package-lock.json ├── package.json ├── release-please-config.json ├── src ├── Primitives.ts └── index.ts ├── tests ├── Address.ts ├── City.ts ├── Course.ts ├── CourseId.ts ├── DeliveryInfo.ts ├── Learner.ts ├── Metadata.ts ├── Primitives.test.ts ├── Product.ts ├── Step.ts ├── Street.ts ├── StringValueObject.ts ├── User.ts ├── Video.ts ├── VideoId.ts └── VideoName.ts └── tsconfig.json /.github/workflows/ci.yml: -------------------------------------------------------------------------------- 1 | # yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json 2 | name: CI 3 | on: 4 | push: 5 | branches: 6 | - main 7 | pull_request: 8 | jobs: 9 | lint-test: 10 | name: 🚀 Lint and test 11 | runs-on: ubuntu-latest 12 | timeout-minutes: 5 13 | steps: 14 | - uses: actions/checkout@v4 15 | - uses: actions/setup-node@v4 16 | with: 17 | node-version: lts/* 18 | cache: npm 19 | - name: 📥 Install dependencies 20 | run: npm install 21 | - name: 💅 Lint code style 22 | run: npm run lint 23 | - name: 💻 Build 24 | run: npm run build 25 | - name: ✅ Run tests 26 | run: npm run test 27 | 28 | publish: 29 | if: github.ref == 'refs/heads/main' && github.event_name == 'push' 30 | name: 📦 Publish 31 | runs-on: ubuntu-latest 32 | needs: lint-test 33 | timeout-minutes: 5 34 | permissions: 35 | # Needed by googleapis/release-please-action@v4 36 | contents: write 37 | pull-requests: write 38 | # Needed by `npm publish --provenance` 39 | id-token: write 40 | steps: 41 | - name: 🍄 Bump package version, create GitHub release, and update changelog 42 | uses: googleapis/release-please-action@v4 43 | id: release 44 | - uses: actions/checkout@v4 45 | if: ${{ steps.release.outputs.release_created }} 46 | - uses: actions/setup-node@v4 47 | if: ${{ steps.release.outputs.release_created }} 48 | with: 49 | node-version: lts/* 50 | cache: npm 51 | registry-url: https://registry.npmjs.org 52 | - name: 🚀 Publish to npm 53 | if: ${{ steps.release.outputs.release_created }} 54 | run: | 55 | npm install 56 | npm run build --if-present 57 | npm publish --provenance 58 | env: 59 | NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }} 60 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | node_modules/ 2 | dist/ 3 | .idea/ -------------------------------------------------------------------------------- /.release-please-manifest.json: -------------------------------------------------------------------------------- 1 | { 2 | ".": "3.1.0" 3 | } -------------------------------------------------------------------------------- /CHANGELOG.md: -------------------------------------------------------------------------------- 1 | # Changelog 2 | 3 | ## [3.1.0](https://github.com/CodelyTV/typescript-primitives-type/compare/v3.0.2...v3.1.0) (2025-04-25) 4 | 5 | 6 | ### Features 7 | 8 | * export iso date time ([#27](https://github.com/CodelyTV/typescript-primitives-type/issues/27)) ([bd0c4b6](https://github.com/CodelyTV/typescript-primitives-type/commit/bd0c4b6a54fa64194db753f0c72295eb9d5954a2)) 9 | 10 | ## [3.0.2](https://github.com/CodelyTV/typescript-primitives-type/compare/v3.0.1...v3.0.2) (2025-04-25) 11 | 12 | 13 | ### Bug Fixes 14 | 15 | * correct readme image ([#25](https://github.com/CodelyTV/typescript-primitives-type/issues/25)) ([7fdd3ef](https://github.com/CodelyTV/typescript-primitives-type/commit/7fdd3efc821e33764ed6ba143293ffae9fb6e2b3)) 16 | 17 | ## [3.0.1](https://github.com/CodelyTV/typescript-primitives-type/compare/v3.0.0...v3.0.1) (2025-04-25) 18 | 19 | 20 | ### Bug Fixes 21 | 22 | * execute build on ci ([#23](https://github.com/CodelyTV/typescript-primitives-type/issues/23)) ([c7f87e8](https://github.com/CodelyTV/typescript-primitives-type/commit/c7f87e89afe7b247e34d66e047c95212edf3bff2)) 23 | 24 | ## [3.0.0](https://github.com/CodelyTV/typescript-primitives-type/compare/v2.0.0...v3.0.0) (2025-04-25) 25 | 26 | 27 | ### ⚠ BREAKING CHANGES 28 | 29 | * convert date to iso instead of number ([#21](https://github.com/CodelyTV/typescript-primitives-type/issues/21)) 30 | 31 | ### Features 32 | 33 | * convert date to iso instead of number ([#21](https://github.com/CodelyTV/typescript-primitives-type/issues/21)) ([7447dd2](https://github.com/CodelyTV/typescript-primitives-type/commit/7447dd2019621a46b5c9a7735494d714116a2b58)) 34 | 35 | ## [2.0.0](https://github.com/CodelyTV/typescript-primitives-type/compare/v1.2.0...v2.0.0) (2025-02-04) 36 | 37 | 38 | ### ⚠ BREAKING CHANGES 39 | 40 | * convert Date type to number ([#18](https://github.com/CodelyTV/typescript-primitives-type/issues/18)) 41 | 42 | ## [1.2.0](https://github.com/CodelyTV/typescript-primitives-type/compare/primitives-type-v1.1.1...primitives-type-v1.2.0) (2025-02-04) 43 | 44 | ### Features 45 | 46 | * No modifications introduced in this version. Being forced to bump the minor version due to automating the release precess. 47 | 48 | ## Previous versions 49 | 50 | * We started automating the changelog generation and release process in this version 1.2.0, but have been using Semantic Versioning since the initial release of this library. 51 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2022 Codely Enseña y Entretiene SL. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 |

2 | 3 | Codely logo 4 | 5 |

6 | 7 |

8 | 🧩 TypeScript Primitives type 9 |

10 | 11 |

12 | Codely Open Source 13 | CodelyTV Courses 14 |

15 | 16 |

17 | TypeScript utility type to ensure to return only properties (not methods) containing values in primitive types such as number or boolean (not Value Objects). 18 |
19 |
20 | Take a look, play and have fun with this. 21 | Stars are welcome 😊 22 |

23 | 24 | # 👀 Usage example 25 | 26 | You can have a domain entity such as the following `Course`: 27 | 28 | ```typescript 29 | import { CourseId } from "./CourseId"; 30 | import { CourseTitle } from "./CourseTitle"; 31 | 32 | export class Course { 33 | constructor(public courseId: CourseId, public courseTitle: CourseTitle) {} 34 | 35 | updateTitle(newCourseTitle: CourseTitle): void { 36 | this.courseTitle = newCourseTitle; 37 | } 38 | 39 | someOtherMethodWithDomainLogic(): void { 40 | // some algorithm 41 | } 42 | } 43 | ``` 44 | 45 | When we want to have a `toPrimitives` method in order to pass an instance of the `Course` class between architectural layers, so the thing we want pass around should be to serialized/marshalled in a way that only containings primitive values such as: 46 | 47 | ```json 48 | { 49 | "courseId": "25658f31-2da1-4942-8b58-88aeacc79860", 50 | "courseTitle": "🚜 TypeScript Avanzado: Más allá de any" 51 | } 52 | ``` 53 | 54 | That is: 55 | 56 | - We want to **avoid including methods** such as the `thisFunctionShouldNotBeIncludedInTheToPrimitives` one, so the transformation should only include properties. 57 | - We want to **flatten or unwrap encapsulated properties** such as the `courseId` and `courseTitle` ones. They are modeled as Value Objects (`CourseId` and `CourseTitle` classes), so the transformation or flatten should only include properties in a recursive manner. 58 | 59 | That is exactly what our `Primitives` utility type guarantees. Let's add it! 💪 60 | 61 | ```typescript 62 | import { Primitives } from "@codelytv/primitives-type"; 63 | 64 | import { CourseId } from "./CourseId"; 65 | import { CourseTitle } from "./CourseTitle"; 66 | 67 | export class Course { 68 | constructor(public courseId: CourseId, public courseTitle: CourseTitle) {} 69 | 70 | updateTitle(newCourseTitle: CourseTitle): void { 71 | this.courseTitle = newCourseTitle; 72 | } 73 | 74 | someOtherMethodWithDomainLogic(): void { 75 | // some algorithm 76 | } 77 | 78 | toPrimitives(): Primitives { 79 | return { 80 | courseId: this.courseId.value, 81 | courseTitle: this.courseTitle.value, 82 | }; 83 | } 84 | } 85 | ``` 86 | 87 | Done! ✌️ 88 | 89 | The `Primitives` return type is ensuring all our restrictions in a very straightforward way! 🌈 90 | 91 | # 👍 How to install 92 | 93 | - Npm: `npm install --save-dev @codelytv/primitives-type` 94 | - Yarn: `yarn add -D @codelytv/primitives-type` 95 | 96 | # 👌 Codely Code Quality Standards 97 | 98 | Publishing this package we are committing ourselves to the following code quality standards: 99 | 100 | - 🤝 Respect **Semantic Versioning**: No breaking changes in patch or minor versions 101 | - 🤏 No surprises in transitive dependencies: Use the **bare minimum dependencies** needed to meet the purpose 102 | - 🎯 **One specific purpose** to meet without having to carry a bunch of unnecessary other utilities 103 | - ✅ **Tests** as documentation and usage examples 104 | - 📖 **Well documented ReadMe** showing how to install and use 105 | - ⚖️ **License favoring Open Source** and collaboration 106 | 107 | # 🔀 Related utilities and resources 108 | 109 | ## ☝️ Learning resources 110 | 111 | - [🚜 TypeScript Avanzado: Más allá de any](https://pro.codely.com/library/typescript-avanzado-mas-alla-de-any-182513/418230/about/) (Spanish - Course) 112 | - [📂 DDD en TypeScript: Estructura de carpetas](https://youtu.be/AJJRk7qmVHg) (Spanish - YouTube video) 113 | - [🔖 Domain-Driven Design en TypeScript](https://pro.codely.com/library/ddd-en-typescript-modelado-y-arquitectura-172533/375662/about/) (Spanish - Course) 114 | - [🐥 JavaScript moderno: Buenas prácticas para empezar y refactorizar aplicaciones](https://pro.codely.com/library/javascript-moderno-buenas-practicas-para-empezar-y-refactorizar-aplicaciones-69571/208928/about/) (Spanish - Course) 115 | - [🏗️ De JavaScript a TypeScript](https://pro.codely.com/library/de-javascript-a-typescript-128106/347481/about/) (Spanish - Course) 116 | 117 | ## 🔷 TypeScript skeletons 118 | 119 | - [🌱 TypeScript Basic Skeleton](https://github.com/CodelyTV/typescript-basic-skeleton): Bootstrap your new TypeScript frontend project 120 | - [🌍 TypeScript API Skeleton](https://github.com/CodelyTV/typescript-api-skeleton): Bootstrap your new TypeScript backend project 121 | 122 | ## 🌈 TypeScript Domain-Driven Design repositories 123 | 124 | - [✨ TypeScript DDD Skeleton](https://github.com/CodelyTV/typescript-ddd-skeleton): Bootstrap your new TypeScript projects applying Hexagonal Architecture and Domain-Driven Design patterns 125 | - [🔖 TypeScript DDD Course](https://github.com/CodelyTV/typescript-ddd-course): Learn Domain-Driven Design in TS lesson by lesson 126 | - [🎯 TypeScript DDD Example](https://github.com/CodelyTV/typescript-ddd-example): Complete project applying Hexagonal Architecture and Domain-Driven Design patterns 127 | 128 | ## 🎯 Other languages Domain-Driven Design repositories 129 | 130 | - [☕🎯 Java DDD Example](https://github.com/CodelyTV/java-ddd-example) 131 | - [🐘🎯 PHP DDD Example](https://github.com/CodelyTV/php-ddd-example) 132 | - [λ🎯 Scala DDD Example](https://github.com/CodelyTV/scala-ddd-example) 133 | - [🦈✨ C# DDD Skeleton](https://github.com/CodelyTV/csharp-ddd-skeleton) 134 | -------------------------------------------------------------------------------- /eslint.config.mjs: -------------------------------------------------------------------------------- 1 | import eslintConfigCodely from "eslint-config-codely"; 2 | 3 | export default [...eslintConfigCodely.ts]; 4 | -------------------------------------------------------------------------------- /jest.config.js: -------------------------------------------------------------------------------- 1 | module.exports = { 2 | testMatch: ["**/tests/**/*.test.ts"], 3 | transform: { 4 | "\\.ts$": "ts-jest", 5 | }, 6 | }; 7 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "@codelytv/primitives-type", 3 | "version": "3.1.0", 4 | "description": "Type entity primitives from value objects", 5 | "keywords": [ 6 | "typescript", 7 | "type", 8 | "toPrimitive", 9 | "Primitives", 10 | "ts", 11 | "types", 12 | "utility", 13 | "util", 14 | "utilities" 15 | ], 16 | "scripts": { 17 | "build": "tsc", 18 | "lint": "eslint src tests eslint.config.mjs jest.config.js", 19 | "lint:fix": "npm run lint -- --fix", 20 | "test": "jest" 21 | }, 22 | "main": "dist/src/index.js", 23 | "types": "dist/src/index.d.ts", 24 | "repository": { 25 | "type": "git", 26 | "url": "git+https://github.com/CodelyTV/typescript-primitives-type" 27 | }, 28 | "author": "codelytv", 29 | "license": "GPL-3.0", 30 | "bugs": { 31 | "url": "https://github.com/CodelyTV/typescript-primitives-type/issues" 32 | }, 33 | "homepage": "https://github.com/CodelyTV/typescript-primitives-type#readme", 34 | "devDependencies": { 35 | "@types/jest": "^29.5.14", 36 | "@typescript-eslint/eslint-plugin": "^8.23.0", 37 | "@typescript-eslint/parser": "^8.23.0", 38 | "eslint": "^8.56.0", 39 | "eslint-config-codely": "^4.4.0", 40 | "eslint-import-resolver-typescript": "^3.7.0", 41 | "expect-type": "^1.1.0", 42 | "jest": "^29.7.0", 43 | "prettier": "^3.4.2", 44 | "ts-jest": "^29.2.5", 45 | "typescript": "^5.7.3" 46 | } 47 | } 48 | -------------------------------------------------------------------------------- /release-please-config.json: -------------------------------------------------------------------------------- 1 | { 2 | "packages": { 3 | ".": { 4 | "changelog-path": "CHANGELOG.md", 5 | "release-type": "node", 6 | "pull-request-title-pattern": "chore: release ${version}", 7 | "pull-request-header": "🍄 Release bump", 8 | "bump-minor-pre-major": true, 9 | "bump-patch-for-minor-pre-major": false, 10 | "draft": false, 11 | "prerelease": false, 12 | "include-v-in-tag": true, 13 | "include-component-in-tag": false 14 | } 15 | }, 16 | "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json" 17 | } 18 | -------------------------------------------------------------------------------- /src/Primitives.ts: -------------------------------------------------------------------------------- 1 | /* eslint-disable @typescript-eslint/no-unsafe-function-type */ 2 | type Year = `${number}${number}${number}${number}`; 3 | type Month = `${number}${number}`; 4 | type Day = `${number}${number}`; 5 | type Hour = `${number}${number}`; 6 | type Minute = `${number}${number}`; 7 | type Second = `${number}${number}`; 8 | type Milliseconds = `${number}${number}${number}`; 9 | type Timezone = "Z" | `${"+" | "-"}${number}${number}:${number}${number}`; 10 | 11 | export type ISODateTime = 12 | `${Year}-${Month}-${Day}T${Hour}:${Minute}:${Second}.${Milliseconds}${Timezone}`; 13 | 14 | type Methods = { 15 | [P in keyof T]: T[P] extends Function ? P : never; 16 | }[keyof T]; 17 | 18 | type MethodsAndProperties = { [key in keyof T]: T[key] }; 19 | 20 | type Properties = Omit, Methods>; 21 | 22 | type PrimitiveTypes = string | number | boolean | undefined | null; 23 | 24 | type DateToISODateTime = T extends Date ? ISODateTime : T; 25 | 26 | type ValueObjectValue = T extends PrimitiveTypes 27 | ? T 28 | : T extends Date 29 | ? ISODateTime 30 | : T extends { value: infer U } 31 | ? DateToISODateTime 32 | : T extends Array<{ value: infer U }> 33 | ? DateToISODateTime[] 34 | : T extends Array 35 | ? Array> 36 | : T extends { [K in keyof Properties]: unknown } 37 | ? { 38 | [K in keyof Properties]: ValueObjectValue[K]>; 39 | } 40 | : T extends unknown 41 | ? DateToISODateTime 42 | : never; 43 | 44 | export type Primitives = { 45 | [key in keyof Properties]: ValueObjectValue; 46 | }; 47 | -------------------------------------------------------------------------------- /src/index.ts: -------------------------------------------------------------------------------- 1 | import { ISODateTime, Primitives } from "./Primitives"; 2 | 3 | export { ISODateTime, Primitives }; 4 | -------------------------------------------------------------------------------- /tests/Address.ts: -------------------------------------------------------------------------------- 1 | import { Primitives } from "../src"; 2 | import { City } from "./City"; 3 | import { Street } from "./Street"; 4 | 5 | export class Address { 6 | constructor( 7 | readonly street: Street, 8 | readonly city: City, 9 | readonly number: number, 10 | ) {} 11 | 12 | toPrimitives(): Primitives
{ 13 | return { 14 | street: this.street.value, 15 | city: this.city.value, 16 | number: this.number, 17 | }; 18 | } 19 | } 20 | -------------------------------------------------------------------------------- /tests/City.ts: -------------------------------------------------------------------------------- 1 | import { StringValueObject } from "./StringValueObject"; 2 | 3 | export class City extends StringValueObject {} 4 | -------------------------------------------------------------------------------- /tests/Course.ts: -------------------------------------------------------------------------------- 1 | import { Primitives } from "../src"; 2 | import { CourseId } from "./CourseId"; 3 | 4 | export class Course { 5 | constructor(readonly courseId: CourseId) {} 6 | 7 | toPrimitives(): Primitives { 8 | return { 9 | courseId: this.courseId.value, 10 | }; 11 | } 12 | 13 | thisFunctionShouldNotBeIncludedInTheToPrimitives(): boolean { 14 | return true; 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /tests/CourseId.ts: -------------------------------------------------------------------------------- 1 | import { StringValueObject } from "./StringValueObject"; 2 | 3 | export class CourseId extends StringValueObject {} 4 | -------------------------------------------------------------------------------- /tests/DeliveryInfo.ts: -------------------------------------------------------------------------------- 1 | import { Primitives } from "../src"; 2 | import { Address } from "./Address"; 3 | 4 | export class DeliveryInfo { 5 | constructor(readonly addresses: Address[]) {} 6 | 7 | toPrimitives(): Primitives { 8 | return { 9 | addresses: this.addresses.map((address) => address.toPrimitives()), 10 | }; 11 | } 12 | } 13 | -------------------------------------------------------------------------------- /tests/Learner.ts: -------------------------------------------------------------------------------- 1 | import { Primitives } from "../src"; 2 | import { CourseId } from "./CourseId"; 3 | 4 | export class Learner { 5 | constructor(readonly enrolledCourses: CourseId[]) {} 6 | 7 | toPrimitives(): Primitives { 8 | return { 9 | enrolledCourses: this.enrolledCourses.map((course) => course.value), 10 | }; 11 | } 12 | } 13 | -------------------------------------------------------------------------------- /tests/Metadata.ts: -------------------------------------------------------------------------------- 1 | import { Primitives } from "../src"; 2 | 3 | export class Metadata { 4 | constructor(public readonly data: Record) {} 5 | 6 | toPrimitives(): Primitives { 7 | return { 8 | data: this.data, 9 | }; 10 | } 11 | } 12 | -------------------------------------------------------------------------------- /tests/Primitives.test.ts: -------------------------------------------------------------------------------- 1 | import { expectTypeOf } from "expect-type"; 2 | 3 | import { Primitives } from "../src"; 4 | import { ISODateTime } from "../src/Primitives"; 5 | import { Course } from "./Course"; 6 | import { DeliveryInfo } from "./DeliveryInfo"; 7 | import { Learner } from "./Learner"; 8 | import { Metadata } from "./Metadata"; 9 | import { Product } from "./Product"; 10 | import { Step } from "./Step"; 11 | import { User } from "./User"; 12 | import { Video } from "./Video"; 13 | 14 | describe("Primitives", () => { 15 | it("should ensure to only return primitive properties excluding methods", () => { 16 | type actualPrimitives = Primitives; 17 | 18 | type expectedPrimitives = { 19 | readonly courseId: string; 20 | }; 21 | 22 | expectTypeOf().toEqualTypeOf(); 23 | }); 24 | 25 | it("should get primitive array type from value object array", () => { 26 | type actualPrimitives = Primitives; 27 | 28 | type expectedPrimitives = { 29 | readonly enrolledCourses: string[]; 30 | }; 31 | 32 | expectTypeOf().toEqualTypeOf(); 33 | }); 34 | 35 | it("should generate nested primitive object", () => { 36 | type actualPrimitives = Primitives; 37 | 38 | type expectedPrimitives = { 39 | readonly address: { 40 | readonly city: string; 41 | readonly street: string; 42 | readonly number: number; 43 | }; 44 | }; 45 | 46 | expectTypeOf().toEqualTypeOf(); 47 | }); 48 | 49 | it("should generate nested primitive type from array of value objects prop", () => { 50 | type actualPrimitives = Primitives; 51 | 52 | type expectedPrimitives = { 53 | readonly addresses: { 54 | readonly city: string; 55 | readonly street: string; 56 | readonly number: number; 57 | }[]; 58 | }; 59 | 60 | expectTypeOf().toEqualTypeOf(); 61 | }); 62 | 63 | it("should get primitive type in case it is not a value object", () => { 64 | type actualPrimitives = Primitives; 65 | 66 | type expectedPrimitives = { 67 | readonly active: boolean; 68 | readonly name: string; 69 | }; 70 | 71 | expectTypeOf().toEqualTypeOf(); 72 | }); 73 | 74 | it("should get primitive ISO string type from Date", () => { 75 | type actualPrimitives = Primitives; 76 | 77 | type expectedPrimitives = { 78 | readonly name: string; 79 | readonly publishedAt: ISODateTime; 80 | }; 81 | 82 | expectTypeOf().toEqualTypeOf(); 83 | }); 84 | 85 | it("should infer the optional properties", () => { 86 | type actualPrimitives = Primitives