is_client.dart

version 1.6.0 (11/11/2014)

is_client is a small Dart package with properties (isClient, isDartClient) to check if your application is running on server-side or client-side. You can also check if the client-side code is running as Dart (on Dartium) or as compiled JavaScript (on Chrome/Firefox/etc).

The dead code blocks isolated by isClient property value can be subjected to a dead code elimination feature provided by dart2js, the Dart to Javascript compiler.

API Document

• http://htmlpreview.github.io/?https://github.com/hyamamoto/is_client.dart/blob/master/docs/index.html

Code Example

// Exmple: Check if this code is running on client-side or server-side.

import "package:is_client/is_client.dart"
...
if ( isClient) {
  print("Hello! I'm on client-side!");
} else {
  print("Hello! I'm on server-side!");
}

// Example: Check if this code is run as JavaScript or not.

import "package:is_client/is_dartium.dart"
...
if ( isDartClient) {
  print("Hello! I'm running Dart!");
} else {
  print("Hello! I'm running JavaScript!");
}

Compile-time dead code elimination

By default, a value for isClient property is generated runtime. It is not treated as the compile-time constants. Meaning, code blocks isolated by if statements WILL NOT be targeted by a dead code elination feature in dart2js.

To compile out the dead code, you must pass a IS_CLIENT constant variable to dart2js via a -D command line argument.

dart2js --minify -DIS_CLIENT=true myapp.dart

import "package:is_client:is_client.dart"
...
if (isServer) {
  print("Hello! I'm a nonexisting code block compiled out by dart2js!");
} else {
  print("Hello!, client!");
}

Change Logs

** 1.6.0 (11/11/2014)**

• Dependency bump
• Tested with dart-1.6.0

** 1.2.0 (2/28/2014)**

• Tested with dart-1.2.0

** 1.1.3 (2/15/2014)**

• Tested with dart-1.1.0, dart 1.1.3

License

is_client.dart is released under the the MIT license by Hiroshi Yamamoto higon@freepress.jp