add script for auto update schemas

lib/.gitignore

@@ -2,6 +2,7 @@
 
 # compiled output
 *.js
+!update-schemas.js
 *.d.ts
 /dist
 /tmp

lib/update-schemas.js

@@ -0,0 +1,40 @@
+const fs = require("fs");
+const path = require("path");
+
+const BASE_URL =
+  "https://raw.githubusercontent.com/angular/angular-cli/main/packages/angular_devkit/build_angular/src/builders/";
+
+(async () => {
+  await updateSchema("browser", "src/browser");
+  await updateSchema("extract-i18n", "src/extract-i18n");
+  await updateSchema("karma", "src/karma");
+  await updateSchema("dev-server", "src/plus-dev-server");
+  await updateSchema("server", "src/server");
+})();
+
+async function updateSchema(builder, targetUrl) {
+  console.log("- Updating schema for", builder, "in", targetUrl);
+
+  const url = path.join(BASE_URL, builder, "schema.json");
+  const schema = await loadRemoteJson(url);
+
+  const extSchemaUrl = `${targetUrl}/schema.ext.json`;
+  const extSchema = loadLocalJson(extSchemaUrl);
+
+  for (const prop in extSchema) {
+    schema.properties[prop] = extSchema[prop];
+  }
+
+  const fullSchemaText = JSON.stringify(schema, null, 2);
+  const fullSchemaUrl = `${targetUrl}/schema.json`;
+
+  fs.writeFileSync(fullSchemaUrl, fullSchemaText, "utf8");
+}
+
+async function loadRemoteJson(url) {
+  return await fetch(url).then((resp) => resp.json());
+}
+
+function loadLocalJson(extSchemaUrl) {
+  return JSON.parse(fs.readFileSync(extSchemaUrl, { encoding: "utf8" }));
+}