From 06bdf13a3d8c471a69eaaa773c3ef6b3d2b32624 Mon Sep 17 00:00:00 2001
From: Brendan Kenny <bckenny@gmail.com>
Date: Wed, 15 Sep 2021 16:21:15 -0500
Subject: [PATCH] core: make main tsc compile cacheable (#13069)

---
 lighthouse-core/index.js | 4 ++++
 tsconfig.json            | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/lighthouse-core/index.js b/lighthouse-core/index.js
index 4c0acf298610..373a8cc1eee9 100644
--- a/lighthouse-core/index.js
+++ b/lighthouse-core/index.js
@@ -70,6 +70,10 @@ lighthouse.getAuditList = Runner.getAuditList;
 lighthouse.traceCategories = require('./gather/driver.js').traceCategories;
 lighthouse.Audit = require('./audits/audit.js');
 lighthouse.Gatherer = require('./gather/gatherers/gatherer.js');
+
+// Explicit type reference (hidden by makeComputedArtifact) for d.ts export.
+// TODO(esmodules): should be a workaround for module.export and can be removed when in esm.
+/** @type {typeof import('./computed/network-records.js')} */
 lighthouse.NetworkRecords = require('./computed/network-records.js');
 
 module.exports = lighthouse;
diff --git a/tsconfig.json b/tsconfig.json
index b2c926eb8be2..bdddf11d97b6 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,6 +1,6 @@
 {
   "compilerOptions": {
-    "noEmit": true,
+    "emitDeclarationOnly": true,
     "module": "commonjs",
     "target": "ES2020",
     "allowJs": true,