Using ts-json-schema-generator to generate schema from TypeScript (#78)

.gitignore

@@ -1,3 +1,4 @@
 node_modules
 **.js
 **.d.ts
+schema.json

package.json

@@ -13,7 +13,7 @@
     "typescript": "^4.9.4"
   },
   "scripts": {
-    "build": "npx tsc",
+    "build": "touch ./schemas.json && ts-json-schema-generator -f tsconfig.json -o ./schemas.json && npx tsc",
     "validate": "node --experimental-json-modules validate.js"
   }
 }

schemas.json

@@ -0,0 +1,71 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "definitions": {
+    "Company": {
+      "additionalProperties": false,
+      "properties": {
+        "jobs": {
+          "additionalProperties": false,
+          "properties": {
+            "dataScientist": {
+              "$ref": "#/definitions/Job"
+            },
+            "productManager": {
+              "$ref": "#/definitions/Job"
+            },
+            "softwareEngineer": {
+              "$ref": "#/definitions/Job"
+            }
+          },
+          "type": "object"
+        },
+        "url": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "jobs"
+      ],
+      "type": "object"
+    },
+    "Job": {
+      "additionalProperties": false,
+      "properties": {
+        "intern": {
+          "$ref": "#/definitions/Opening"
+        },
+        "manager": {
+          "$ref": "#/definitions/Opening"
+        },
+        "newGrad": {
+          "$ref": "#/definitions/Opening"
+        },
+        "senior": {
+          "$ref": "#/definitions/Opening"
+        }
+      },
+      "type": "object"
+    },
+    "JobsData": {
+      "additionalProperties": {
+        "$ref": "#/definitions/Company"
+      },
+      "type": "object"
+    },
+    "Opening": {
+      "additionalProperties": false,
+      "properties": {
+        "available": {
+          "type": "boolean"
+        },
+        "url": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "available"
+      ],
+      "type": "object"
+    }
+  }
+}

validate.ts

@@ -1,60 +1,12 @@
-import Ajv, { JSONSchemaType, DefinedError } from "ajv";
-import type { Opening, Job, Company, JobsData } from "./index";
-import data from "./data.json" assert { type: "json" };
-
-const openingSchema: JSONSchemaType<Opening> = {
-  type: "object",
-  required: ["available"],
-  properties: {
-    available: { type: "boolean" },
-    url: { type: "string", nullable: true },
-  },
-  additionalProperties: false,
-};
-
-const jobSchema: JSONSchemaType<Job> = {
-  type: "object",
-  required: [],
-  properties: {
-    intern: { ...openingSchema, nullable: true },
-    newGrad: { ...openingSchema, nullable: true },
-    senior: { ...openingSchema, nullable: true },
-    manager: { ...openingSchema, nullable: true },
-  },
-  additionalProperties: false,
-};
-
-const companySchema: JSONSchemaType<Company> = {
-  type: "object",
-  required: ["jobs"],
-  properties: {
-    url: { type: "string", nullable: true },
-    jobs: {
-      type: "object",
-      required: [],
-      properties: {
-        softwareEngineer: { ...jobSchema, nullable: true },
-        dataScientist: { ...jobSchema, nullable: true },
-        productManager: { ...jobSchema, nullable: true },
-      },
-      additionalProperties: false,
-    },
-  },
-  additionalProperties: false,
-};
-
-const schema: JSONSchemaType<JobsData> = {
-  type: "object",
-  required: [],
-  additionalProperties: companySchema,
-};
-
-// @ts-ignore
-const ajv: Ajv = new Ajv.default();
-const validate = ajv.compile(schema);
-if (!validate(data)) {
-  for (const error of validate.errors as DefinedError[]) {
+import Ajv, { DefinedError, Schema } from 'ajv';
+import data from './data.json' assert { type: 'json' };
+import schemas from './schemas.json' assert { type: 'json' };
+
+const ajv = new Ajv();
+ajv.addSchema(schemas as Schema);
+if (!ajv.validate('#/definitions/JobsData', data)) {
+  for (const error of ajv.errors as DefinedError[]) {
     console.error(error);
   }
-  throw new Error("Validation failure");
+  throw new Error('Validation failure');
 }