add originalLayer to footprint, minor refactor (#53)

lib/components/footprint.ts

@@ -0,0 +1,25 @@
+import { layer_ref, type LayerRef } from "@tscircuit/soup"
+import { expectTypesMatch } from "lib/typecheck"
+import { z } from "zod"
+
+export interface FootprintProps {
+  /**
+   * The layer that the footprint is designed for. If you set this to "top"
+   * then it means the children were intended to represent the top layer. If
+   * the <chip /> with this footprint is moved to the bottom layer, then the
+   * components will be mirrored.
+   *
+   * Generally, you shouldn't set this except where it can help prevent
+   * confusion because you have a complex multi-layer footprint. Default is
+   * "top" and this is most intuitive.
+   */
+  originalLayer?: LayerRef
+}
+
+export const footprintProps = z.object({
+  originalLayer: layer_ref.default("top").optional(),
+})
+
+export type FootprintPropsInput = z.input<typeof footprintProps>
+type InferredFootprintProps = z.infer<typeof footprintProps>
+expectTypesMatch<InferredFootprintProps, FootprintProps>(true)

lib/index.ts

@@ -59,6 +59,7 @@ export * from "./components/constraint"
 export * from "./components/smtpad"
 export * from "./components/hole"
 export * from "./components/trace"
+export * from "./components/footprint"
 
 export const inductorProps = commonComponentProps.extend({
   inductance,
@@ -161,9 +162,6 @@ export const schematicPathProps = z.object({
 })
 export type SchematicPathProps = z.input<typeof schematicPathProps>
 
-export const footprintProps = z.object({})
-export type FootprintProps = z.input<typeof footprintProps>
-
 export const componentProps = commonComponentProps
 export type ComponentProps = z.input<typeof componentProps>