Initial geospatial component

Author: davidjamesstone

package-lock.json

@@ -75,11 +75,12 @@
   },
   "license": "SEE LICENSE IN LICENSE",
   "dependencies": {
-    "@defra/forms-model": "^3.0.622",
+    "@defra/forms-model": "^3.0.624",
     "@defra/hapi-tracing": "^1.29.0",
     "@defra/interactive-map": "^0.0.4-alpha",
     "@elastic/ecs-pino-format": "^1.5.0",
     "@hapi/boom": "^10.0.1",
+    "@hapi/bourne": "^3.0.0",
     "@hapi/catbox": "^12.1.1",
     "@hapi/catbox-memory": "^6.0.2",
     "@hapi/catbox-redis": "^7.0.2",
@@ -91,6 +92,8 @@
     "@hapi/vision": "^7.0.3",
     "@hapi/wreck": "^18.1.0",
     "@hapi/yar": "^11.0.3",
+    "@turf/centroid": "^7.3.4",
+    "@turf/helpers": "^7.3.4",
     "@types/humanize-duration": "^3.27.4",
     "accessible-autocomplete": "^3.0.1",
     "atob": "^2.1.2",

package.json

@@ -12,13 +12,15 @@ import {
 } from '~/src/server/plugins/engine/types/index.js'
 import {
   type ErrorMessageTemplateList,
+  type Feature,
   type FileState,
   type FormPayload,
   type FormState,
   type FormStateValue,
   type FormSubmissionError,
   type FormSubmissionState,
   type FormValue,
+  type GeospatialState,
   type RepeatItemState,
   type RepeatListState,
   type UploadState
@@ -303,9 +305,36 @@ export function isUploadState(value?: unknown): value is UploadState {
   return value.every(isUploadValue)
 }
 
+/**
+ * Check for geospatial state
+ */
+export function isGeospatialState(value?: unknown): value is GeospatialState {
+  if (!Array.isArray(value)) {
+    return false
+  }
+
+  // Skip checks when empty
+  if (!value.length) {
+    return true
+  }
+
+  return value.every(isGeospatialValue)
+}
+
 /**
  * Check for upload state value
  */
 export function isUploadValue(value?: unknown): value is FileState {
   return isFormState(value) && typeof value.uploadId === 'string'
 }
+
+/**
+ * Check for geospatial state value
+ */
+export function isGeospatialValue(value?: unknown): value is Feature {
+  return (
+    isFormState(value) &&
+    typeof value.type === 'string' &&
+    value.type === 'Feature'
+  )
+}