pipes default values through to json-schema (#9039)

packages/turbo-types/package.json

@@ -18,12 +18,14 @@
     "build": "tsc && pnpm generate-schema",
     "lint": "eslint src/",
     "lint:prettier": "prettier -c . --cache",
-    "generate-schema": "node scripts/generate-schema.mjs"
+    "generate-schema": "tsx scripts/generate-schema.ts"
   },
   "devDependencies": {
     "@turbo/eslint-config": "workspace:*",
     "@turbo/tsconfig": "workspace:*",
-    "ts-json-schema-generator": "2.3.0"
+    "@types/node": "^20",
+    "ts-json-schema-generator": "2.3.0",
+    "tsx": "^4.19.0"
   },
   "files": [
     "src",

packages/turbo-types/scripts/generate-schema.ts

@@ -0,0 +1,52 @@
+#!/usr/bin/env node
+
+import { writeFileSync } from "node:fs";
+import { join } from "node:path";
+import { createGenerator } from "ts-json-schema-generator";
+
+const __dirname = new URL(".", import.meta.url).pathname;
+const packageRoot = join(__dirname, "..", "src");
+
+/**
+ * post-process the schema recursively to:
+ * 1. replace any key named `defaultValue` with `default`
+ * 1. remove any backticks from the value
+ * 1. attempt to parsing the value as JSON (falling back, if not)
+ */
+const postProcess = <T>(item: T): T => {
+  if (typeof item !== "object" || item === null) {
+    return item;
+  }
+  if (Array.isArray(item)) {
+    return item.map(postProcess) as unknown as T;
+  }
+  return Object.fromEntries(
+    Object.entries(item).map(([key, value]) => {
+      if (key === "defaultValue" && typeof value === "string") {
+        const replaced = value.replaceAll(/`/g, "");
+        try {
+          return ["default", JSON.parse(replaced)];
+        } catch (e) {
+          return ["default", replaced];
+        }
+      }
+      return [key, postProcess(value)];
+    })
+  ) as T;
+};
+
+const create = (fileName: string, typeName: string) => {
+  const generator = createGenerator({
+    path: join(packageRoot, "index.ts"),
+    tsconfig: join(__dirname, "../tsconfig.json"),
+    type: "Schema",
+    extraTags: ["defaultValue"],
+  });
+  const schema = postProcess(generator.createSchema(typeName));
+  const filePath = join(__dirname, "..", "schemas", fileName);
+  writeFileSync(filePath, JSON.stringify(schema, null, 2));
+};
+
+create("schema.v1.json", "SchemaV1");
+create("schema.v2.json", "Schema");
+create("schema.json", "Schema");

packages/turbo-types/tsconfig.json

@@ -1,6 +1,8 @@
 {
   "extends": "@turbo/tsconfig/library.json",
   "compilerOptions": {
-    "rootDir": "."
+    "rootDir": ".",
+    "module": "ESNext",
+    "lib": ["ESNext"],
   }
 }