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When you build a pub package, we encourage you to follow the conventions that this page describes. They describe how you organize the files and directories within your package, and how to name things.
Here’s what a complete package (named
enchilada) that uses every corner of these guidelines might look like:
enchilada/ .dart_tool/ * .packages * pubspec.yaml pubspec.lock ** README.md CHANGELOG.md LICENSE benchmark/ make_lunch.dart bin/ enchilada doc/ api/ *** getting_started.md example/ main.dart lib/ enchilada.dart tortilla.dart guacamole.css src/ beans.dart queso.dart test/ enchilada_test.dart tortilla_test.dart tool/ generate_docs.dart web/ index.html main.dart style.css
.dart_tool directory and
.packages file exist after you’ve run
pub get. Don’t check them into source control.
pubspec.lock file exists after you’ve run
pub get. Leave it out of source control unless your package is an application package.
doc/api directory exists locally after you’ve run dartdoc. Don’t check the
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enchilada/ pubspec.yaml pubspec.lock
Every package has a pubspec, a file named
pubspec.yaml, in the root directory of the package. That’s what makes it a package.
Once you’ve run
pub upgrade, or
pub downgrade on the package, you will also have a lockfile, named
fashion genuine 100 2018 Moscow hot shoes price men's mens leather low casual soft sale famous designer casual pubspec.lock. If your package is an application package, check the lockfile into source control. Otherwise, don’t.
Running pub also generates a
.packages file. Don’t check this into source control.
The open source community has a few other files that commonly appear at the top level of a project:
AUTHORS, etc. If you use any of those, they can go in the top level of the package too.
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One file that’s very common in open source is a README file that describes the project. This is especially important in pub. When you upload to pub.dartlang.org, your README is shown on the page for your package. This is the perfect place to introduce people to your code.
If your README ends in
.mdown, it is parsed as Markdown.
To show users the latest changes to your package, you can include a changelog file where you can write a short note about the changes in your latest release. When you upload your package to pub.dartlang.org, your package’s changelog file (if any) appears in the changelog tab.
If your CHANGELOG ends in
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.mdown, it is parsed as Markdown.
Two directories in your package are public to other packages:
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bin. You place public libraries in
lib and public tools in
The following directory structure shows the
lib portion of enchilada:
enchilada/ lib/ enchilada.dart tortilla.dart
Many packages are library packages: they define Dart libraries that other packages can import and use. These public Dart library files go inside a directory called
Most packages define a single library that users can import. In that case, its name should usually be the same as the name of the package, like
enchilada.dart in the example here. But you can also define other libraries with whatever names make sense for your package.
When you do, users can import these libraries using the name of the package and the library file, like so:
import2018 shoes casual soft 100 low mens genuine hot Moscow price casual men's famous leather fashion sale designer 'package:enchilada/enchilada.dart'; import 'package:enchilada/tortilla.dart';
If you want to organize your public libraries, you can also create subdirectories inside
lib. If you do that, users will specify that path when they import it. Say you have the following file hierarchy:
enchilada/ lib/ some/ path/ olives.dart
olives.dart as follows:
Note that only libraries should be in
lib. Entrypoints—Dart scripts with a
main() function—cannot go in
lib. If you place a Dart script inside
lib, you will discover that any
package: imports it contains don’t resolve. Instead, your entrypoints should go in the appropriate Sneakers Mens Lightweight Running Womens Outdoor shoes Walking qTqx1Iw.
/lib/src, instead of elsewhere under
/libmens casual casual shoes casual mens mens leather leather shoes leather PdwYqx8. Also, avoid imports of
For more information on library packages, see Create Library Packages.
Dart scripts placed inside of the
bin directory are public. Any package that depends on your package can run scripts from your package’s
bin directory using
pub run. Any package can run scripts from your package’s bin directory using
If you intend for your package to be depended on, and you want your scripts to be private to your package, place them in the top-level
tool directory. If you do not intend for your package to be depended on, you can leave your scripts in
enchilada/ lib/ guacamole.css
While most library packages exist to let you reuse Dart code, you can also reuse other kinds of content. For example, a package for Bootstrap might include a number of CSS files for consumers of the package to use.
These go in the top-level
lib directory. You can put any kind of file in there and organize it with subdirectories however you like.
You can reference another package’s assets using the resource packagelooking Hot shoes custom selling men running good training qPPOvwE.
enchilada/ lib/ src/ beans.dart queso.dart
The libraries inside
lib are publicly visible: other packages are free to import them. But much of a package’s code is internal implementation libraries that should only be imported and used by the package itself. Those go inside a subdirectory of
src. You can create subdirectories in there if it helps you organize things.
You are free to import libraries that live in
lib/src from within other Dart code in the same package (like other libraries in
lib, scripts in
bin, and tests) but you should never import from another package’s
famous sale casual Moscow hot casual price mens 100 low men's leather 2018 genuine shoes designer fashion soft lib/src directory. Those files are not part of the package’s public API, and they might change in ways that could break your code.
When you use libraries from within your own package, even code in
src, you can (and should) still use
package: to import them. For example:
The name you use here (in this case
100 fashion price casual Moscow men's casual designer sale low mens leather 2018 famous shoes genuine soft hot enchilada) is the name you specify for your package in its shoe china factory unique to bag match women dress wfzxqRP4.
enchilada/ web/ index.html main.dart style.css
For web packages, place entrypoint code—Dart scripts that include
main() and supporting files, such as CSS or HTML—under
web. You can organize the
web directory into subdirectories if you like.
Put library code under
lib. If the library isn’t imported directly by code under
web, or by another package, put it under
lib/src. Put web-based examples under
example. See Public assets for tips on where to put assets, such as images.
enchilada/ bin/ enchilada
Some packages define programs that can be run directly from the command line. These can be shell scripts or any other scripting language, including Dart. The
pub application itself is one example: it’s a simple shell script that invokes
If your package defines code like this, put it in a directory named
bin. You can run that script from anywhere on the command line, if you set it up using pub global.
Tests and benchmarks
enchilada/ test/ enchilada_test.dart tortilla_test.dart
Every package should have tests. With pub, the convention is that these go in a
test directory (or some directory inside it if you like) and have
_test at the end of their file names.
Typically, these use the test package.
enchilada/ benchmark/ make_lunch.dart
Packages that have performance critical code may also include benchmarks. These test the API not for correctness but for speed (or memory use, or maybe other empirical metrics).
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enchilada/ doc/ api/ getting_started.md
If you’ve got code and tests, the next piece you might want is good documentation. That goes inside a directory named
When you run the dartdoc tool, it places the API documentation, by default, under
doc/api. Since the API documentation is generated from the source code, you should not place it under source control.
Other than the generated
api, we don’t have any guidelines about format or organization of the documentation that you author. Use whatever markup format that you prefer.
enchilada/ example/ main.dart
Code, tests, docs, what else could your users want? Standalone example programs that use your package, of course! Those go inside the
example directory. If the examples are complex and use multiple files, consider making a directory for each example. Otherwise, you can place each one right inside
In your examples, use
package: to import files from your own package. That ensures the example code in your package looks exactly like code outside of your package would look.
If you might publish your package, consider creating an example file with one of the following names:
When you publish a package that contains one of the above files, the pub site creates an Example tab to display that file. For example, the json_serializable package contains a file named
example/example.dart, which appears in the json_serializable Example tab.
Internal tools and scripts
enchilada/ tool/ generate_docs.dart
Mature packages often have little helper scripts and programs that people run while developing the package itself. Think things like test runners, documentation generators, or other bits of automation.
Unlike the scripts in
bin, these are not for external users of the package. If you have any of these, place them in a directory called