Pub dev

Jan 25, 2024 · A command-line tool for developing and deploying web applications with Dart. Requirements #. The latest release of webdev requires Dart SDK 2.18.0 or later.. To use webdev with a package, make sure you have entries in pubspec.yaml similar to:... dev_dependencies: build_runner: ^2.4.0 build_web_compilers: ^4.0.4 ...

Pub dev. 2 days ago · Devon man, 24, will be 'deeply missed'. Wetherspoon profits soar by £36m as they aim to open more pubs. The White Hart is owned by Mr Milton who bought it after it …

Jan 30, 2024 · What is Stacked. Stacked is a Flutter Framework for building Production Applications. It is a complete frontend architecture for Flutter. The framework is created to build testable and maintainable code. Checkout the official docs for more information.

InMed Pharmaceuticals (INM) stock is rocketing higher on Friday after the company revealed research and development (R&D) updates. INM will now focus more on its pharmaceutical bus...Oct 9, 2023 · Pub.dev . Searching for packages Package scoring and pub points. Flutter . Using packages Developing packages and plugins Publishing a package. Dart . Using packages Publishing a package. in_app_update 4.2.2 . in_app_update: ^4.2.2 copied to clipboard. Published 5 months ago • jonasbark.de Dart 3 compatible.Aug 21, 2023 · Pass the dp size of the design draft ( (The unit is the same as the unit at initialization)):. Adapted to screen width: ScreenUtil ().setWidth (540), Adapted to screen height: ScreenUtil ().setHeight (200), In general, the height is best to adapt to the width. If your dart sdk>=2.6, you can use extension functions:This spring, I am all about freshening up the outside of my home. Maybe because much of my winter was devoted to the deep, dark basement, as soon as winter broke, I wanted to get o...Jan 27, 2024 · The free Font Awesome Icon pack available as set of Flutter Icons - based on font awesome version 6.5.1. This icon pack includes only the free icons offered by Font Awesome out-of-the-box. If you have purchased the pro icons and want to enable support for them, please see the instructions below.

In December 2018, Google released the 1.0 version of Flutter and adoption has been growing exponentially since it's release. Flutter is a cross-platform ...Dec 19, 2023 · Requires that the additionalSignUpFields argument is passed to FlutterLogin. When given, this callback must return a Future<bool>. If it evaluates to true the card containing the additional signup fields is shown, right after the evaluation of callback. If not given the default behaviour is not to show the signup card.Xuất bản ... Flutter sẽ hỏi bạn có sẵn sàng để upload chưa, bạn điền y và nhấn Enter . ... Sau đó bạn trở về đợi terminal báo thành công thôi. Sau khi upload thành ...4 days ago · Description. Homepage. Repository. Issue tracker. Documentation. Dependencies. Executables. Platforms. Publish_to. Funding. False_secrets. Screenshots. Topics. Ignored_advisories. SDK constraints. more_horiz. Every pub package needs some metadata so it can specify its dependencies.Mar 7, 2024 · Pub.dev Searching for packages Package scoring and pub points. Flutter Using packages Developing packages and plugins Publishing a package. Dart ... Published 18 days ago • tools.dart.dev Dart 3 compatible. SDK Dart Flutter. Platform Android iOS Linux macOS web Windows. 253.Mar 4, 2024 · pub.dev, or often simply “ Pub ”, is the main Google-hosted repository of all public Flutter packages. If you are building a Flutter SDK, all your packages will likely live …

Jan 9, 2024 · Features. Use this plugin in your Flutter app to: Show in-app products that are available for sale from the underlying store. Products can include consumables, permanent upgrades, and subscriptions. Load in-app products that the user owns. Send the user to the underlying store to purchase products. Present a …4 days ago · Pub.dev limits screenshots to the following specifications: File size: max 4 MB per image. File types: png, jpg, gif, or webp. Static and animated images are both allowed. Keep screenshot files small. Each download of the package includes all screenshot files. Pub.dev generates the package's thumbnail image from the first …Jun 18, 2023 · pub.dev网站,在Flutter中使用 :blue_heart: !屏幕截图 桌面 药片 移动的 这个概念 在Flutter中重新创建Pub.dev的原因主要有以下三个: 迭代开发响应式框架,并通过创建真实世界的网站来对库进行场景测试。使响应式框架成为最佳Flutter Web框架的方法是构建实际的Flutter网站!Apr 25, 2023 · Isar Database. Quickstart • Documentation • Sample Apps • Support & Ideas • Pub.dev. Isar [ee-zahr]: River in Bavaria, Germany. Crazy fast NoSQL database that is a joy to use.; Features #. 💙 Made for Flutter.Easy to use, no config, no boilerplate; 🚀 Highly scalable The sky is the limit (pun intended); 🍭 Feature rich.Composite & multi-entry …Feb 26, 2024 · Serverpod. Serverpod is a next-generation app and web server, built for the Flutter community. It allows you to write your server-side code in Dart, automatically generate your APIs, and hook up your database with minimal effort. Serverpod is open-source, and you can host your server anywhere. Get Started - Join the Mailing List.Mar 12, 2024 · Pub.dev . Searching for packages Package scoring and pub points. Flutter . Using packages Developing packages and plugins Publishing a package. Dart . Using packages Publishing a package. cloud_firestore 4.15.9 . cloud_firestore: ^4.15.9 copied to clipboard. Published 13 days ago • firebase.google.com Dart 3 …

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Actinic keratosis is a small, rough, raised area on your skin. Often this area has been exposed to the sun over a long period of time. Actinic keratosis is a small, rough, raised a... Step 1: Create the package. Step 2: Implement the package. Developing plugin packages. Federated plugins. Specifying a plugin’s supported platforms. Step 1: Create the package. Step 2: Implement the package. Add support for platforms in an existing plugin project. Dart platform implementations. The pub package manager has a command-line interface that works with either the flutter tool or the dart tool. With either tool, add the pub command followed by a subcommand such as get: $ dart pub get # Gets dependencies for a non-Flutter package $ flutter pub get # Gets dependencies for a Flutter package. Feb 15, 2024 · Pub.dev . Searching for packages Package scoring and pub points. Flutter . Using packages Developing packages and plugins Publishing a package. Dart . Using packages Publishing a package. geolocator 11.0.0 . geolocator: ^11.0.0 copied to clipboard. Published 39 days ago • baseflow.com Dart 3 compatible.5 days ago · A Global Open Source Community. Supported by Google, open to everyone. Collaborate on the open source framework, contribute to the package ecosystem on pub.dev, and find help when you need it. Learn more Join the community. Dart.Located in the heart of Dalbeattie, Scotland, the Kings Arms is not just your ordinary pub. It is a gateway to endless outdoor adventures that will leave you breathless and wanting...

Mar 19, 2024 · Add pigeon as a dev_dependency. Make a ".dart" file outside of your "lib" directory for defining the communication interface. Run pigeon on your ".dart" file to generate the required Dart and host-language code: flutter pub get then flutter pub run pigeon with suitable arguments. Example. Add the generated Dart code to ./lib for compilation.May 19, 2023 · Like dart:io, package:file supplies a rich Dart-idiomatic API for accessing a file system. Can be used to implement custom file systems. Comes with an in-memory implementation out-of-the-box, making it super-easy to test code that works with the file system. Allows using multiple file systems simultaneously. A file system is a first-class … Step 1: Create the package. Step 2: Implement the package. Developing plugin packages. Federated plugins. Specifying a plugin’s supported platforms. Step 1: Create the package. Step 2: Implement the package. Add support for platforms in an existing plugin project. Dart platform implementations. A shelf registration is the filing with the SEC for a security offering that is released to the public market incrementally over a period of time. A shelf registration is the filin...Mar 9, 2024 · Appwrite aims to help you develop your apps faster and in a more secure way. Use the Flutter SDK to integrate your app with the Appwrite server to easily start interacting with all of Appwrite backend APIs and tools. For full API documentation and tutorials go to https://appwrite.io/docs.Mar 19, 2024 · Create a service account for publishing to pub.dev, Enable automated publishing in the admin tab for the package on pub.dev, specifying the email of the service account created for publishing. Grant the default Cloud Build service account permission to impersonate the service account created for publishing.Feb 20, 2024 · A library that exposes device specific speech recognition capability. This plugin contains a set of classes that make it easy to use the speech recognition capabilities of the underlying platform in Flutter. It supports Android, iOS and web. The target use cases for this library are commands and short phrases, not continuous spoken conversion ...Mar 10, 2023 · Pub.dev . Searching for packages Package scoring and pub points. Flutter . Using packages Developing packages and plugins Publishing a package. Dart . Using packages Publishing a package. async 2.11.0 . async: ^2.11.0 copied to clipboard. Published 12 months ago • dart.dev Dart 3 compatible.

Apr 25, 2023 · Isar Database. Quickstart • Documentation • Sample Apps • Support & Ideas • Pub.dev. Isar [ee-zahr]: River in Bavaria, Germany. Crazy fast NoSQL database that is a joy to use.; Features #. 💙 Made for Flutter.Easy to use, no config, no boilerplate; 🚀 Highly scalable The sky is the limit (pun intended); 🍭 Feature rich.Composite & multi-entry …

Sep 5, 2023 · An expandable Flutter widget list where each item can be expanded or collapsed simply by clicking on the header. Simple to use accordion widget with lots of preset properties. Use the maxOpenSections property to automatically close sections when opening a new section. This is especially helpful if you always want your list to look clean -- just ...Pub.dev . Searching for packages Package scoring and pub points. Flutter . Using packages Developing packages and plugins Publishing a package. Dart . Using packages Publishing a package. logger 2.2.0 . logger: ^2.2.0 copied to clipboard. Published 30 hours ago Dart 3 compatible. SDK Dart Flutter.The goal of this package is to make it easy to implement the BLoC Design Pattern (Business Logic Component). This design pattern helps to separate presentation from business logic. Following the BLoC pattern facilitates testability and reusability. This package abstracts reactive aspects of the pattern allowing developers to focus on writing ...Jan 11, 2024 · Instructions. Open a command line and cd to your projects root folder. In your pubspec, add an entry for dart-uuid to your dependencies (example below) pub install. If you wish to run tests, go into packages/dart-uuid/ and run 'dart test/uuid_test.dart'.4 days ago · Pub.dev limits screenshots to the following specifications: File size: max 4 MB per image. File types: png, jpg, gif, or webp. Static and animated images are both allowed. Keep screenshot files small. Each download of the package includes all screenshot files. Pub.dev generates the package's thumbnail image from the first …Feb 13, 2024 · Pub.dev . Searching for packages Package scoring and pub points. Flutter . Using packages Developing packages and plugins Publishing a package. Dart . ... (like libsqlite3-dev on Debian), or you can manually ship sqlite3 with your app (see below). macOS: Contains a built-in version of sqlite that this package will …Apr 5, 2023 · Parsing, simplification and differentiation of mathematical expressions. Supporting most basic math functions out of the box. Extensible through custom function definitions in code. Well documented and tested. This package contains a very simple command-line interpreter for real numbers: dart pub run math_expressions:interpreter.1 day ago · Learn how to use the dart pub command to share your packages with the Dart ecosystem. Find out how to prepare, publish, and transfer your packages to a verified …

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Mar 19, 2024 · Enabling automated publishing on pub.dev, specifying: The GitHub repository and, A tag-pattern that must match to allow publishing. Creating a GitHub Actions …Jan 7, 2024 · $ dart pub add envied $ dart pub add --dev envied_generator $ dart pub add --dev build_runner This installs three packages: build_runner, the tool to run code-generators; envied_generator, the code generator; envied, a package containing the annotations. Usage # Add a .env file at the root of the project.Mar 12, 2024 · Pub.dev . Searching for packages Package scoring and pub points. Flutter . Using packages Developing packages and plugins Publishing a package. Dart . Using packages Publishing a package. firebase_auth 4.17.9 . firebase_auth: ^4.17.9 copied to clipboard. Published 13 days ago • firebase.google.com Dart 3 compatible.pub.dev官网打不开怎么办呢? pub.dev官网打不开 我们可以使用 https://pub.flutter-io.cn/ (80多万人在学)Dart Flutter 入门实战系列视频教程 Serverless+Egg.js+Vue3.x无人点餐 无人收银全栈项目 Nestjs仿小米商城企业级Nodejs项目实战视频教 Nestjs基础 ...Feb 3, 2024 · Features. Fully Typed: work faster and safer with compile time checks and IDE autocomplete, including fully typed Cache reads and writes. 🔄 Built-In Code Generators: automatically generated immutable data classes for all your GraphQL Operations and Fragments, based on your schema. 🌐 Customizable Network Interface: highly customizable ...May 16, 2022 · 在 Flutter 开发中,考虑到我们不同业务组件下依赖不同版本的基础组件,如果采用分支依赖管理特别不方便,因此搭建私有 pub 包服务很有搭建必要。在技术调研后发现 pub 官方开源的的 puJan 30, 2024 · What is Stacked. Stacked is a Flutter Framework for building Production Applications. It is a complete frontend architecture for Flutter. The framework is created to build testable and maintainable code. Checkout the official docs for more information.Mar 19, 2024 · description bug_report. 如何使用 package. 目录 keyboard_arrow_down. 创建 pubspec. Getting packages. 从包中导入库. 升级依赖. 更多内容. 如何使用. 参考. Pub 子 …If you're considering franchising, this guide will take you through exactly how to franchise your business so you can take the first step. Are you tired of working eighty hours a w...Sep 12, 2023 · Forked from (Pub) flutter_datetime_picker as it had issues with dart 3.0/Flutter 3.10. This package only works on Flutter >=3.10.0. If you need an older version, please use the original package. (Pub) flutter_datetime_picker_plus. Documentation # A flutter date time picker inspired by flutter-cupertino-date-pickerFeb 27, 2024 · DCli is based on Dart which is a modern programming language that has a set of features that makes building CLI apps easy and reliable. Dart and DCli are simple to learn. Compiled or JIT. Shebang support (run .dart scripts directly from the cli ./hello.dart) Small transportable execs (from 10MB), Dart VM is NOT …4 days ago · By default, dart pub add uses the latest stable version of the package from the pub.dev site that is compatible with your SDK constraints and dependencies. For example, if 0.13.3 is the latest stable version of the http package, then dart pub add http adds http: ^0.13.3 under dependencies in your pubspec.yaml.. You can … ….

Pub.dev . Searching for packages Package scoring and pub points. Flutter . Using packages Developing packages and plugins Publishing a package. Dart . Using packages Publishing a package. logger 2.2.0 . logger: ^2.2.0 copied to clipboard. Published 30 hours ago Dart 3 compatible. SDK Dart Flutter.Dec 5, 2023 · A comprehensive, cross-platform path manipulation library for Dart. The path package provides common operations for manipulating paths: joining, splitting, normalizing, etc. We've tried very hard to make this library do the "right" thing on whatever platform you run it on, including in the browser. When you use …Mar 1, 2024 · Click "Create a key". Set the "Key Name" (E.g. "Sign in with Apple key") Check the box next to "Sign in with Apple", then click "Configure" on the same row. Under "Primary App ID" select the App ID of the app you want to use (either the newly created one or an existing one) Click "Save" to leave the detail view.Apr 5, 2023 · Parsing, simplification and differentiation of mathematical expressions. Supporting most basic math functions out of the box. Extensible through custom function definitions in code. Well documented and tested. This package contains a very simple command-line interpreter for real numbers: dart pub run math_expressions:interpreter.Mar 19, 2024 · dart pub upgrade 命令用于重新生成 lockfile 文件,并使用最新可用版本的依赖包。. 如果仅升级某个依赖,可以在命令中指定需要升级的包:. $ dart pub upgrade transmogrify. 上面的命令升级 transmogrify 到最新版本,但维持其它包不变。. [ dart pub upgrade] 命令并非总是可以将 ...Wollongong, located on the stunning coast of New South Wales, is not only known for its breathtaking beaches and vibrant culture but also for its thriving pub scene. Whether you’re...Jun 30, 2023 · json_serializable 6.7.1. Provides Dart Build System builders for handling JSON. The builders generate code when they find members annotated with classes defined in package:json_annotation. To generate to/from JSON code for a class, annotate it with JsonSerializable. You can provide arguments to …Mar 5, 2024 · Pub.dev . Searching for packages Package scoring and pub points. Flutter . Using packages Developing packages and plugins Publishing a package. Dart . Using packages Publishing a package. video_player 2.8.3 . video_player: ^2.8.3 copied to clipboard. Published 19 days ago • flutter.dev Dart 3 compatible.Mar 12, 2024 · Pub.dev . Searching for packages Package scoring and pub points. Flutter . Using packages Developing packages and plugins Publishing a package. Dart . Using packages Publishing a package. cloud_firestore 4.15.9 . cloud_firestore: ^4.15.9 copied to clipboard. Published 13 days ago • firebase.google.com Dart 3 … Pub dev, Sep 8, 2023 · Get is a lightweight and powerful solution for Flutter that combines state management, dependency injection, and route management. Learn how to use Get with examples, features, and …, May 16, 2022 · 在 Flutter 开发中,考虑到我们不同业务组件下依赖不同版本的基础组件,如果采用分支依赖管理特别不方便,因此搭建私有 pub 包服务很有搭建必要。在技术调研后发现 pub 官方开源的的 pu, Calculating pub points prior to publishing # The pub.dev site uses the analysis tool pana to calculate pub points. This is run automatically on the pub.dev site whenever you publish a new package, or a new version of an existing package. You can view your pub points report to get suggestions before publishing, by running pana locally:, Feb 25, 2024 · In-place substitute for Flutter's stock DataTable and PaginatedDataTable widgets with fixed/sticky header/top rows and left columns. A few useful features missing in the originals were added. DataTable2 and PaginatedDataTable2 widgets are based on the sources of Flutter's originals, mimic the API and provide seamless integration., 2 days ago · A picturesque Devon pub has scooped a prestigious industry award in its second year of trading. The Harbour Inn at Axmouth, situated less than a mile from …, Jan 27, 2024 · The free Font Awesome Icon pack available as set of Flutter Icons - based on font awesome version 6.5.1. This icon pack includes only the free icons offered by Font Awesome out-of-the-box. If you have purchased the pro icons and want to enable support for them, please see the instructions below., Mar 1, 2024 · If you have many localization keys and are confused, key generation will help you. The code editor will automatically prompt keys. Steps: Open your terminal in the folder's path containing your project. Run in terminal flutter pub run easy_localization:generate -f keys -o locale_keys.g.dart. Past import., Jan 31, 2024 · Flutter Animate. A performant library that makes it simple to add almost any kind of animated effect in Flutter. Pre-built effects like fade, scale, slide, align, flip, blur, shake, shimmer, shadows, crossfades, follow path, and color effects (saturation, color, and tint) All via a simple, unified API without fussing with AnimationController ..., Jan 31, 2024 · Flutter Animate. A performant library that makes it simple to add almost any kind of animated effect in Flutter. Pre-built effects like fade, scale, slide, align, flip, blur, shake, shimmer, shadows, crossfades, follow path, and color effects (saturation, color, and tint) All via a simple, unified API without fussing with AnimationController ..., Mar 19, 2024 · description bug_report. 为 pub 命令配置环境变量. Environment variables allow you to customize pub to suit your needs. PUB_CACHE. Some of pub's …, Learn how to create, get, import, and upgrade Dart packages using the pub package manager. Find out how to use pub subcommands, troubleshoot problems, and reference the pub documentation. , Nov 16, 2022 · Pub.dev . Searching for packages Package scoring and pub points. Flutter . Using packages Developing packages and plugins Publishing a package. Dart . Using packages Publishing a package. rxdart 0.27.7 . rxdart: ^0.27.7 copied to clipboard. Published 16 months ago • fluttercommunity.dev Dart 3 compatible • …, Mar 15, 2024 · go_router. A declarative routing package for Flutter that uses the Router API to provide a convenient, url-based API for navigating between different screens. You can define URL patterns, navigate using a URL, handle deep links, and a number of other navigation-related scenarios., Mar 7, 2024 · flutter pub global activate rename Running a Script # You can run a script directly using rename from the activated package through the command line. If facing any issues, alternate commands are dart pub global run rename or flutter pub global run rename. For path variable issues, refer to ensuring your path variables are set up correctly. Usage # , Nov 14, 2023 · Pub.dev . Searching for packages Package scoring and pub points. Flutter . Using packages Developing packages and plugins Publishing a package. Dart . Using packages Publishing a package. localization 2.1.1 . localization: ^2.1.1 copied to clipboard. Published 4 months ago • flutterando.com.br Dart 3 compatible., Jun 1, 2023 · flutter_dotenv #. Load configuration at runtime from a .env file which can be used throughout the application.. The twelve-factor app stores config in environment variables (often shortened to env vars or env).Env vars are easy to change between deploys without changing any code... they are a language- and OS-agnostic standard., Nov 16, 2022 · Pub.dev . Searching for packages Package scoring and pub points. Flutter . Using packages Developing packages and plugins Publishing a package. Dart . Using packages Publishing a package. rxdart 0.27.7 . rxdart: ^0.27.7 copied to clipboard. Published 16 months ago • fluttercommunity.dev Dart 3 compatible • …, Oct 23, 2023 · Flutter Code Editor allows you to define read-only code blocks. This may be useful for learning use cases when users are guided to modify certain code blocks while other code is meant to be protected from changes. To make a named section read-only, pass a set of named sections to the controller.readOnlySectionNames:, Mar 15, 2024 · go_router. A declarative routing package for Flutter that uses the Router API to provide a convenient, url-based API for navigating between different screens. You can define URL patterns, navigate using a URL, handle deep links, and a number of other navigation-related scenarios., Jan 4, 2024 · When any of the observables change, builder will be called again to rebuild the Widget. This gives you a seamless way to create a reactive Widget. Note that the Observer will print a warning if no observables are discovered in the builder function. Flutter integration for MobX. It provides a set of Observer widgets that …, May 8, 2023 · 本文介绍了如何在 Flutter 中使用已经发布的 package,以及如何搜索、添加、移除和更新 package 依赖。包括 CSS Colors 和 url_launcher 两个示例,以及如何解决 …, Feb 20, 2024 · Pub.dev . Searching for packages Package scoring and pub points. Flutter . Using packages Developing packages and plugins Publishing a package. Dart . Using packages Publishing a package. flutter_svg 2.0.10+1 . flutter_svg: ^2.0.10+1 copied to clipboard. Published 33 days ago • dnfield.dev Dart 3 compatible., 4 days ago · Mongo-dart - MongoDB driver for Dart programming language. Server-side driver library for MongoDb implemented in pure Dart. Server side means all packages using dart:io, dart:html are not accepted. NOTE Starting from release 6.0 of MongDb the old messages structure has been removed (almost completely). This means that some …, May 30, 2023 · tools.dart.dev. Metadata. A client library for authenticating with a remote service via OAuth2 on behalf of a user, and making authorized HTTP requests with the user's OAuth2 credentials. Repository (GitHub) View/report issues. Documentation. API reference. License. BSD-3-Clause . Dependencies. collection, crypto, http, http_parser. …, Aug 1, 2023 · Photo_gallery is a Flutter plugin that allows you to access images and videos from your device's native gallery. You can use it to create stunning photo apps with Flutter. Learn more about photo_gallery and other Flutter packages on pub.dev., Oct 11, 2023 · Pub.dev Searching for packages Package scoring and pub points. Flutter Using packages Developing packages and plugins Publishing a package. Dart ... Alternatively, your editor might support pub get or flutter packages get. Check the docs for your editor to learn more. 3. Import it # Now in your Dart code, you can use:, Calculating pub points prior to publishing # The pub.dev site uses the analysis tool pana to calculate pub points. This is run automatically on the pub.dev site whenever you publish a new package, or a new version of an existing package. You can view your pub points report to get suggestions before publishing, by running pana locally:, Feb 1, 2024 · Flutter Form Builder. This package helps in creation of data collection forms in Flutter by removing the boilerplate needed to build a form, validate fields, react to changes and collect final user input. Also included are common ready-made form input fields for FormBuilder. This gives you a convenient way of adding …, Feb 15, 2024 · Pub.dev . Searching for packages Package scoring and pub points. Flutter . Using packages Developing packages and plugins Publishing a package. Dart . Using packages Publishing a package. geolocator 11.0.0 . geolocator: ^11.0.0 copied to clipboard. Published 39 days ago • baseflow.com Dart 3 compatible., In 1953, Jack Odell created the first matchbox car in London, England. The first car was a steamroller made of brass and painted red and green. In an assembly-line style production..., jiangsu.tianditu.gov.cn, Jun 5, 2023 · dart.dev. Metadata. Library for defining parsers for parsing raw command-line arguments into a set of options and values using GNU and POSIX style options. Repository (GitHub) View/report issues Contributing. Topics. #cli. Documentation. API reference. License. BSD-3-Clause . More. Packages that depend on args, You've likely schemed ways to get energy for free, especially with energy costs rising. Is there a good way to get energy for free, or is it hooey? Advertisement Conserving energy ...