Derive TS type from JSON Schema

So we don't define (almost) the same schema twice

package.json

@@ -15,6 +15,7 @@
   "author": "Râu Cao <raucao@kosmos.org>",
   "license": "MIT",
   "devDependencies": {
+    "json-schema-to-ts": "^3.1.1",
     "remotestoragejs": "^2.0.0-beta.8",
     "rimraf": "^6.1.2",
     "typescript": "^5.9.3"

pnpm-lock.yaml

@@ -15,6 +15,9 @@ importers:
         specifier: ^3.0.2
         version: 3.0.2
     devDependencies:
+      json-schema-to-ts:
+        specifier: ^3.1.1
+        version: 3.1.1
       remotestoragejs:
         specifier: ^2.0.0-beta.8
         version: 2.0.0-beta.8
@@ -27,6 +30,10 @@ importers:
 
 packages:
 
+  '@babel/runtime@7.28.6':
+    resolution: {integrity: sha512-05WQkdpL9COIMz4LjTxGpPNCdlpyimKppYNoJ5Di5EUObifl8t4tuLuUBBZEpoLYOmfvIWrsp9fCl0HoPRVTdA==}
+    engines: {node: '>=6.9.0'}
+
   '@isaacs/balanced-match@4.0.1':
     resolution: {integrity: sha512-yzMTt9lEb8Gv7zRioUilSglI0c0smZ9k5D65677DLWLtWJaXIS3CqcGyUFByYKlnUj6TkjLVs54fBl6+TiGQDQ==}
     engines: {node: 20 || >=22}
@@ -54,6 +61,10 @@ packages:
     resolution: {integrity: sha512-tvZgpqk6fz4BaNZ66ZsRaZnbHvP/jG3uKJvAZOwEVUL4RTA5nJeeLYfyN9/VA8NX/V3IBG+hkeuGpKjvELkVhA==}
     engines: {node: 20 || >=22}
 
+  json-schema-to-ts@3.1.1:
+    resolution: {integrity: sha512-+DWg8jCJG2TEnpy7kOm/7/AxaYoaRbjVB4LFZLySZlWn8exGs3A4OLJR966cVvU26N7X9TWxl+Jsw7dzAqKT6g==}
+    engines: {node: '>=16'}
+
   latlon-geohash@2.0.0:
     resolution: {integrity: sha512-OKBswTwrvTdtenV+9C9euBmvgGuqyjJNAzpQCarRz1m8/pYD2nz9fKkXmLs2S3jeXaLi3Ry76twQplKKUlgS/g==}
 
@@ -84,6 +95,9 @@ packages:
     engines: {node: 20 || >=22}
     hasBin: true
 
+  ts-algebra@2.0.0:
+    resolution: {integrity: sha512-FPAhNPFMrkwz76P7cdjdmiShwMynZYN6SgOujD1urY4oNm80Ou9oMdmbR45LotcKOXoy7wSmHkRFE6Mxbrhefw==}
+
   tv4@1.3.0:
     resolution: {integrity: sha512-afizzfpJgvPr+eDkREK4MxJ/+r8nEEHcmitwgnPUqpaP+FpwQyadnxNoSACbgc/b1LsZYtODGoPiFxQrgJgjvw==}
     engines: {node: '>= 0.8.0'}
@@ -109,6 +123,8 @@ packages:
 
 snapshots:
 
+  '@babel/runtime@7.28.6': {}
+
   '@isaacs/balanced-match@4.0.1': {}
 
   '@isaacs/brace-expansion@5.0.0':
@@ -132,6 +148,11 @@ snapshots:
       minipass: 7.1.2
       path-scurry: 2.0.1
 
+  json-schema-to-ts@3.1.1:
+    dependencies:
+      '@babel/runtime': 7.28.6
+      ts-algebra: 2.0.0
+
   latlon-geohash@2.0.0: {}
 
   lru-cache@11.2.4: {}
@@ -165,6 +186,8 @@ snapshots:
       glob: 13.0.0
       package-json-from-dist: 1.0.1
 
+  ts-algebra@2.0.0: {}
+
   tv4@1.3.0: {}
 
   typescript@5.9.3: {}

src/places.ts

@@ -1,53 +1,43 @@
 import BaseClient from 'remotestoragejs/release/types/baseclient';
 import Geohash from 'latlon-geohash';
 import { ulid } from 'ulid';
+import { FromSchema } from 'json-schema-to-ts';
 
-interface Place {
+const placeSchema = {
-  id: string;
+  type: 'object',
-  title: string;
+  properties: {
-  lat: number;
+    id: { type: 'string' },
-  lon: number;
+    title: { type: 'string' },
-  geohash: string;
+    lat: { type: 'number' },
-  zoom?: number;
+    lon: { type: 'number' },
-  url?: string;
+    geohash: { type: 'string' },
-  osmId?: string;
+    zoom: { type: 'number' },
-  osmType?: string;
+    url: { type: 'string' },
-  osmTags?: Record<string, string>;
+    osmId: { type: 'string' },
-  description?: string;
+    osmType: { type: 'string' },
-  tags?: string[];
+    osmTags: {
-  createdAt: string;
+      type: 'object',
-  updatedAt?: string;
+      additionalProperties: { type: 'string' },
-  [key: string]: any;
+    },
-}
+    description: { type: 'string' },
+    tags: {
+      type: 'array',
+      items: { type: 'string' },
+      default: [],
+    },
+    createdAt: { type: 'string', format: 'date-time' },
+    updatedAt: { type: 'string', format: 'date-time' },
+  },
+  required: ['id', 'title', 'lat', 'lon', 'geohash', 'createdAt'],
+} as const;
+
+type Place = FromSchema<typeof placeSchema> & { [key: string]: any };
 
 const Places = function (
   privateClient: BaseClient /*, publicClient: BaseClient */
 ) {
   // Define Schema
-  privateClient.declareType('place', {
+  privateClient.declareType('place', placeSchema as any);
-    type: 'object',
-    properties: {
-      id: { type: 'string', required: true },
-      title: { type: 'string', required: true },
-      lat: { type: 'number', required: true },
-      lon: { type: 'number', required: true },
-      geohash: { type: 'string', required: true },
-      zoom: { type: 'number' },
-      url: { type: 'string' },
-      osmId: { type: 'string' },
-      osmType: { type: 'string' },
-      osmTags: { type: 'object' },
-      description: { type: 'string' },
-      tags: {
-        type: 'array',
-        items: { type: 'string' },
-        default: [],
-      },
-      createdAt: { type: 'string', format: 'date-time', required: true },
-      updatedAt: { type: 'string', format: 'date-time' },
-    },
-    required: ['id', 'title', 'lat', 'lon', 'geohash', 'createdAt'],
-  });
 
   // Helper to normalize place object
   function preparePlace(data: Partial<Place>): Place {
@@ -70,6 +60,7 @@ const Places = function (
       lon,
       geohash,
       title,
+      tags: data.tags || [],
       createdAt: data.createdAt || now,
       updatedAt: data.id ? now : undefined,
     };