Transforms blog

themes/default/content/blog/announcing-new-transform-callbacks/index.md

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+---
+title: "Announcing new transform callbacks"
+date: 2024-05-15
+meta_desc: Transform callbacks are a rebuild of the transformations system to work for Multi-Language Components
+meta_image: meta.png
+authors:
+    - fraser-waters
+tags:
+    - features
+---
+
+Pulumi has supported a [transformations](/docs/concepts/resources#transformations) system for a number of years now. This has proved to be a powerful and flexible escape hatch for editing resource properties across your entire program. 
+
+However it was written before the advent of Multi-Language Components (MLCs) and functioned entirely on in-memory data structures, a sensible choice at the time but impossible to extend to work with the cross process nature of MLCs.
+
+We've now written a new system based on a new "callback" system which allows the Pulumi engine to call back into your user program to answer requests.
+
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