ng-annotate

ng-annotate

ng-annotate adds and removes AngularJS dependency injection annotations. It is non-intrusive so your source code stays exactly the same otherwise. No lost comments or moved lines.

Without annotations:

angular.module("MyMod").controller("MyCtrl", function($scope, $timeout) {
});

With annotations:

angular.module("MyMod").controller("MyCtrl", ["$scope", "$timeout", function($scope, $timeout) {
}]);

Annotations are useful because with them you're able to minify your source code using your favorite JS minifier.

How does ng-annotate compare to ngmin?

If you are currently using ngmin then this is probably your first question. In short: ng-annotate is much faster, finds more declarations to annotate (including ui-router), treats your source code better, is actively maintained and has a bunch of extra features on top of that. A much more elaborated answer can be found in "The future of ngmin and ng-annotate".

Migrating from ngmin: ng-annotate -a - is similar to ngmin (use stdin and stdout). ng-annotate -a in.js -o out.js is similar to ngmin in.js out.js. Grunt users can migrate easily by installing grunt-ng-annotate and replacing ngmin with ngAnnotate in their Gruntfile. Scroll down for information about other tools.

Installation and usage

npm install -g ng-annotate

Then run it as ng-annotate OPTIONS <file>. The errors (if any) will go to stderr, the transpiled output to stdout.

Use the --add (-a) option to add annotations where non-existing, use --remove (-r) to remove all existing annotations, use --add --remove (-ar) to rebuild all annotations.

Use the -o option to write output to file.

Provide - instead of an input <file> to read input from stdin.

experimental Use the --es6 option for ES6 support via the Acorn parser.

Use the --sourcemap option to generate an inline sourcemap.

Use the --sourceroot option to set the sourceRoot property of the generated sourcemap.

Use the --single_quotes option to output '$scope' instead of "$scope".

Use the --regexp option to restrict matching further or to expand matching. See description further down.

experimental Use the --rename option to rename providers (services, factories, controllers, etc.) with a new name when declared and referenced through annotation. Use it like this: --rename oldname1 newname1 oldname2 newname2

experimental Use the --plugin option to load a user plugin with the provided path, 0.9.x may change API). See plugin-example.js for more info.

experimental Use the --stats option to print statistics on stderr.

Highly recommended: enable ng-strict-di in your minified builds

<div ng-app="myApp" ng-strict-di>

Do that in your ng-annotate processed builds and AngularJS will let you know if there are any missing dependency injection annotations. This is an upcoming feature in AngularJS 1.3 (docs).

A future version of ng-annotate may get support for adding the ng-strict-di attribute automatically so you don't have to think about it.

Tools support

• Grunt: grunt-ng-annotate by Michał Gołębiowski
• Browserify: browserify-ngannotate by Owen Smith
• Brunch: ng-annotate-uglify-js-brunch by Kagami Hiiragi
• Gulp: gulp-ng-annotate by Kagami Hiiragi
• Broccoli: broccoli-ng-annotate by Gilad Peleg
• Rails asset pipeline: ngannotate-rails by Kari Ikonen
• Grails asset pipeline: angular-annotate-asset-pipeline by Craig Burke
• Webpack: ng-annotate-webpack-plugin by Chris Liechty
• Something missing? Contributions welcome - create plugin and submit a README pull request!

Changes

See CHANGES.md.

Why?

• Keep your code base clutter free from annotations but add them in your build step prior to minimizing
• De-clutter an existing code base by removing annotations, non-intrusively
• If you must store annotations in the repo (for any reason) then checkout, remove them, code and refactor without annotations, add them back and commit. Alternatively checkout, code and refactor (ignoring annotations), rebuild them and commit.

Declaration forms

ng-annotate understands the two common declaration forms:

Long form:

angular.module("MyMod").controller("MyCtrl", function($scope, $timeout) {
});

Short form:

myMod.controller("MyCtrl", function($scope, $timeout) {
});

It's not limited to .controller of course. It understands .config, .factory, .directive, .filter, .run, .controller, .provider, .service, .animation and .invoke.

For short forms it does not need to see the declaration of myMod so you can run it on your individual source files without concatenating. If ng-annotate detects a short form false positive then you can use the --regexp option to limit the module identifier. Examples: --regexp "^myMod$" (match only myMod) or --regexp "^$" (ignore short forms). You can also use --regexp to opt-in for more advanced method callee matching, for example --regexp "^require(.*)$" to detect and transform require('app-module').controller(..). Not using the option is the same as passing --regexp "^[a-zA-Z0-9_\$\.\s]+$", which means that the callee can be a (non-unicode) identifier (foo), possibly with dot notation (foo.bar).

ng-annotate understands angular.module("MyMod", function(dep) ..) as an alternative to angular.module("MyMod").config(function(dep) ..).

ng-annotate understands this.$get = function($scope) .. and {.., $get: function($scope) ..} inside a provider. self and that can be used as aliases for this.

ng-annotate understands return {.., controller: function($scope) ..} inside a directive.

ng-annotate understands $provide.decorator("bar", function($scope) ..), $provide.service, $provide.factory and $provide.provider.

ng-annotate understands $routeProvider.when("path", { .. }).

ng-annotate understands $httpProvider.interceptors.push(function($scope) ..) and $httpProvider.responseInterceptors.push(function($scope) ..).

ng-annotate understands $injector.invoke(function ..).

ng-annotate understands ui-router ($stateProvider and $urlRouterProvider).

ng-annotate understands $modal.open (angular-ui/bootstrap).

ng-annotate understands $mdDialog.show, $mdToast.show and $mdBottomSheet.show (angular material design).

ng-annotate understands chaining.

ng-annotate understands IIFE's and attempts to match through them, so (function() { return function($scope) .. })() works anywhere function($scope) .. does (for any IIFE args and params).

Reference-following

ng-annotate follows references. This works iff the referenced declaration is a) a function declaration or b) a variable declaration with an initializer. Modifications to a reference outside of its declaration site are ignored by ng-annotate.

These examples will get annotated:

function MyCtrl($scope, $timeout) {
}
var MyCtrl2 = function($scope) {};

angular.module("MyMod").controller("MyCtrl", MyCtrl);
angular.module("MyMod").controller("MyCtrl", MyCtrl2);

Explicit annotations

You can prepend a function expression with /* @ngInject */ to explicitly state that this function should get annotated. ng-annotate will leave the comment intact and will thus still be able to also remove or rewrite such annotations. Alternatively, you can wrap an expression inside an ngInject(..) function call. Use /* @ngInject */ or ngInject(..) as an occasional workaround when ng-annotate doesn't support your code style but feel free to open an issue also.

x = /* @ngInject */ function($scope) {};
obj = {controller: /*@ngInject*/ function($scope) {}};
obj.bar = /*@ngInject*/ function($scope) {};

function ngInject(f) { return f } // define this once in your program
x = ngInject(function($scope) {});
obj = {controller: ngInject(function($scope) {})};
obj.bar = ngInject(function($scope) {});

=>

x = /* @ngInject */ ["$scope", function($scope) {}];
obj = {controller: /*@ngInject*/ ["$scope", function($scope) {}]};
obj.bar = /*@ngInject*/ ["$scope", function($scope) {}];

function ngInject(f) { return f } // define this once in your program
x = ngInject(["$scope", function($scope) {}]);
obj = {controller: ngInject(["$scope", function($scope) {}])};
obj.bar = ngInject(["$scope", function($scope) {}]);

Prepended to an object literal, /* @ngInject */ will annotate all of its contained function expressions, recursively:

obj = /*@ngInject*/ {
    controller: function($scope) {},
    resolve: { data: function(Service) {} },
};

obj = ngInject({
    controller: function($scope) {},
    resolve: { data: function(Service) {} },
});

=>

obj = /*@ngInject*/ {
    controller: ["$scope", function($scope) {}],
    resolve: { data: ["Service", function(Service) {}] },
};

obj = ngInject({
    controller: ["$scope", function($scope) {}],
    resolve: { data: ["Service", function(Service) {}] },
});

Prepended to a function statement, to a single variable declaration initialized with a function expression or to an assignment where the rvalue is a function expression, /* @ngInject */ will attach an $inject array to the function:

// @ngInject
function Foo($scope) {}

// @ngInject
var foo = function($scope) {}

// @ngInject
module.exports = function($scope) {}

=>

// @ngInject
function Foo($scope) {}
Foo.$inject = ["$scope"];

// @ngInject
var foo = function($scope) {}
foo.$inject = ["$scope"];

// @ngInject
module.exports = function($scope) {}
module.exports.$inject = ["$scope"];

Issues and compatibility

If ng-annotate does not handle a construct you're using, if there's a bug or if you have a feature request then please file an issue.

Build and test

ng-annotate is written in ES6 constlet style and uses defs.js to transpile to ES5. See BUILD.md for build and test instructions.

License

MIT, see LICENSE file.

ng-annotate is written by Olov Lassus with the kind help by contributors. Follow @olov on Twitter for updates about ng-annotate.

Performance

ng-annotate is designed to be very fast (in general limited by parse speed). It traverses the AST exactly once and transforms it without the need for an AST -> source decompilation step.

Library (API)

ng-annotate can be used as a library. See ng-annotate.js for further info about options and return value.

var ngAnnotate = require("ng-annotate");
var somePlugin = require("./some/path/some-plugin");
var res = ngAnnotate(src, {
    add: true,
    es6: true,
    plugin: [somePlugin],
    rename: [{from: "generalname", to: "uniquename"}, {from: "alpha", to: "beta"}],
    sourcemap: { inline: false, inFile: "source.js", sourceRoot: "/path/to/source/root" }
});
var errorstringArray = res.errors;
var transformedSource = res.src;
var transformedSourceMap = res.map;