fix: move (internal) util to fix circular dependency

src/grid/functions/distance.ts

@@ -1,5 +1,4 @@
-import { HexCoordinates, HexPrototype } from '../../hex'
-import { assertCubeCoordinates } from '../../utils'
+import { assertCubeCoordinates, HexCoordinates, HexPrototype } from '../../hex'
 
 export function distance(
   hexPrototype: Pick<HexPrototype, 'offset' | 'isPointy'>,

src/grid/traversers/ring.ts

@@ -1,5 +1,4 @@
-import { Hex, HexCoordinates } from '../../hex'
-import { assertCubeCoordinates } from '../../utils'
+import { assertCubeCoordinates, Hex, HexCoordinates } from '../../hex'
 import { distance } from '../functions'
 import { Rotation, Traverser } from '../types'
 

src/hex/functions/assertCubeCoordinates.ts

@@ -0,0 +1,15 @@
+import { isOffset } from '../../utils/isOffset'
+import { CubeCoordinates, HexCoordinates, HexPrototype } from '../types'
+import { offsetToCube } from './offsetToCube'
+
+/**
+ * Util for converting offset/axial/cube coordinates to cube coordinates. It's not placed in /src/utils because that causes circular dependencies.
+ * @private
+ */
+export function assertCubeCoordinates(
+  coordinates: HexCoordinates,
+  hexPrototype: Pick<HexPrototype, 'offset' | 'isPointy'>,
+): CubeCoordinates {
+  const { q, r, s = -q - r } = isOffset(coordinates) ? offsetToCube(coordinates, hexPrototype) : coordinates
+  return { q, r, s }
+}

src/hex/functions/index.ts

@@ -1,3 +1,4 @@
+export * from './assertCubeCoordinates'
 export * from './center'
 export * from './cloneHex'
 export * from './corners'

src/utils/index.ts

@@ -1,4 +1,3 @@
-export * from './assertCubeCoordinates'
 export * from './isAxial'
 export * from './isFunction'
 export * from './isObject'