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Deprecated and New features in Spring 19

Deprecated Default Values Without Square Brackets for Array, Set, and List Attributes

Setting a default value without square brackets is deprecated and can lead to unexpected behavior. To set a default value for these attribute types, surround comma-separated values with []; for example, default="['red', 'green', 'blue']".
Where: This change applies to orgs with Lightning components in Lightning Experience, Salesforce Classic, and all versions of the Salesforce app.
How: Here’s an example of attributes for an array, a list, and a set.
<aura:attribute name="colorArray" type="String[]" default="['red', 'green', 'blue']" />
<aura:attribute name="colorList" type="List" default="['red', 'green', 'blue']" />
<aura:attribute name="colorSet" type="Set" default="['red', 'green', 'blue']" />

Get Notified About Unsaved Changes

Notify the UI about unsaved changes in your component with the lightning:unsavedChanges Aura component. You can uselightning:unsavedChanges in standard and console navigation apps. You can then use a controller to save or discard the changes.
Where: This change applies to orgs with Lightning components in Lightning Experience, Salesforce Classic, and all versions of the Salesforce app.

Reference Asset Files with the $ContentAsset Global Value Provider

The $ContentAsset global value provider lets you reference images, style sheets, and JavaScript used as asset files in your Lightning components. Reference $ContentAsset asset files by name instead of using cumbersome file paths or URLs. $ContentAsset provides sharing, versioning, and access control for all asset files, as well as options for mobile optimization and resizing of image files. You can use $ContentAsset in Lightning components markup and within JavaScript controller and helper code.
Where: This change applies to Lightning Experience in Professional, Enterprise, Performance, and Unlimited editions.
How: To reference a specific asset file in component markup, use $ContentAsset.yourNamespace__assetName. Orgs without a namespace can use $ContentAsset.assetDeveloperName. Use this syntax regardless of whether an asset is for authenticated or unauthenticated sessions. To reference a content asset within an archive, add pathinarchive as a parameter appended to the basic syntax: $ContentAsset.yourNamespace__assetName + 'pathinarchive=images/sampleImage.jpg'.
Include cascading style sheets or JavaScript libraries in a component using the <ltng:require> tag.
The $ContentAsset global value provider doesn’t support versions or scaling parameters. Only the latest version of the asset file is served, and only the original size of the image is returned.


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