revconf

Revisioned configuration able to withstand major version upgrades.

Installation

You can install the plugin using NPM or bower depending on your build environment. To install with NPM, type:

npm install --save revconf

To install with Bower, type:

bower install revconf

Usage Example

This example shows how to use revconf in your browser with one converter which enables users of older versions of your application to keep as much of their settings as possible.

To create a real scenario, first write an old configuration to your local storage:

localStorage.setItem("my-app-config", JSON.stringify({
  revisions: [
    {
      revision: 0,
      data: {
        view: "table",
        showAds: false,
        enableNewFeatures: true,
        oldSetting: "whatever"
      }
    }
  ]
}));

Then, use revconf to convert the old configuration into the new revision:

var defaultOptions = {
  view: 'table',
  showAds: true,
  enableNewFeatures: false
};

var config = revconf("my-app-config")
    .accessor(revconf.storageAccessor)
    .converter({
      from: 0, to: 1,
      convert: function(oldConfig) {
        return {
          view: oldConfig.view,
          showAds: oldConfig.showAds,
          enableNewFeatures: false
        };
      }
    })
    .revision(1);

var obj = config();
console.info(obj);
if (typeof obj === "undefined") {
  obj = config(defaultOptions);
}
console.info(obj);

revconf stores the new revision alongside the old one in the local storage to prevent any possible data loss.

Copyright

Copyright (c) 2016 Vincent Wochnik.

License: MIT