1 files changed, 47 insertions, 0 deletions
diff --git a/tools/ts/build_services.js b/tools/ts/build_services.js
new file mode 100644
index 0000000000..397eff7074
--- /dev/null
+++ b/tools/ts/build_services.js
@@ -0,0 +1,47 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+/**
+ * Build: <objdir>/dist/@types/lib.gecko.services.d.ts,
+ *
+ * from:  <objdir>/xpcom/components/services.json,
+ *        generated by a previous build step.
+ */
+
+const fs = require("fs");
+
+const HEADER = `/**
+ * NOTE: Do not modify this file by hand.
+ * Content was generated from services.json.
+ */
+`;
+
+const SERVICES = {
+  cpmm: ["ContentProcessMessageManager"],
+  mm: ["ChromeMessageBroadcaster"],
+  ppmm: ["ParentProcessMessageManager"],
+};
+
+function main(lib_dts, services_json) {
+  let interfaces = JSON.parse(fs.readFileSync(services_json, "utf8"));
+
+  for (let [iface, svc] of Object.entries(interfaces)) {
+    SERVICES[svc] = SERVICES[svc] ?? [];
+    SERVICES[svc].push(iface);
+  }
+
+  let lines = [HEADER];
+  lines.push("interface JSServices {");
+  for (let [svc, ifaces] of Object.entries(SERVICES).sort()) {
+    lines.push(`  ${svc}: ${ifaces.join(" & ")};`);
+  }
+  lines.push("}\n");
+
+  let dts = lines.join("\n");
+  console.log(`[INFO] ${lib_dts} (${dts.length.toLocaleString()} bytes)`);
+  fs.writeFileSync(lib_dts, dts);
+}
+
+main(...process.argv.slice(2));