What's New: Mixins

CDK Terrain v0.23.0 brought mixins to CDKTN projects. A mixin applies a reusable piece of behavior to one specific construct, without subclassing it.

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What changed

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constructs peer dependency raised to ^10.6.0

v0.23.0 raised the constructs peer dependency from ^10.4.2 to ^10.6.0 (cdk-terrain#20). constructs 10.6.0 adds the mixin primitive, and CDKTN inherits it from that library:

• The IMixin interface, with a supports(construct) method that decides whether the mixin applies to a construct and an applyTo(construct) method that applies the change.
• The construct.with(...mixins) method, which applies mixins to a construct immediately and returns the same construct.

If your project pins constructs below 10.6.0, raise it when you upgrade to v0.23.

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No built-in mixins yet

CDKTN core does not ship ready-made mixins. You write your own, using building blocks that work with any provider, such as TerraformResource.isTerraformResource and addOverride.

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Learn more

The Mixins concept page shows how to define and apply mixins, with examples. It also explains when to use a mixin instead of an Aspect.