    Npm.depends({
        'mailgun-js': '0.4.13'
    });

Package.describe({
    summary: "Mailgun API - Mailgun api implementation for Meteor."
});

Package.on_use(function(api) {
    // Allow us to detect 'insecure'.
    api.use('insecure', {weak: true});

    api.add_files('mailgun-api.js', ['server']);
    api.export && api.export('Mailgun', ['server']);
});

Package.on_test(function (api) {
    api.use(['mailgun-api', 'tinytest']);

    api.add_files('mailgun-api_tests.js', ['server']);
});

(function () {
    'use strict';
    Npm.depends({
        'mailgun-js': '0.4.13'
    });

    Package.describe({
        summary: "Mailgun API - Mailgun api implementation for Meteor."
    });

    Package.on_use(function(api) {
        // Allow us to detect 'insecure'.
        api.use('insecure', {weak: true});

        api.add_files('mailgun-api.js', ['server']);
        api.export('Mailgun', ['server']);
    });

    Package.on_test(function (api) {
        api.use(['mailgun-api', 'tinytest']);

        api.add_files('mailgun-api_tests.js', ['server']);
    });
} ());
Put package.js in a closure added use strict