From 41211f8b61d741afbc176a57be7b74912cbe9322 Mon Sep 17 00:00:00 2001
From: Trivikram Kamat <16024985+trivikr@users.noreply.github.com>
Date: Fri, 22 Jan 2021 14:01:32 -0800
Subject: [PATCH] feat: use downlevel-dts to generate TS 3.4 compatible types
 (#266)

---
 .../amazon/smithy/typescript/codegen/base-package.json   | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/base-package.json b/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/base-package.json
index dea467427cb..7c27b6c20e5 100644
--- a/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/base-package.json
+++ b/smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/base-package.json
@@ -13,7 +13,8 @@
     "test": "yarn build && jest --coverage --passWithNoTests",
     "build:cjs": "tsc -p tsconfig.json",
     "build:es": "tsc -p tsconfig.es.json",
-    "build": "yarn build:cjs && yarn build:es"
+    "build": "yarn build:cjs && yarn build:es",
+    "postbuild": "downlevel-dts types types/ts3.4"
   },
   "main": "./dist/cjs/index.js",
   "types": "./types/index.d.ts",
@@ -29,6 +30,7 @@
     "tslib": "^2.0.0"
   },
   "devDependencies": {
+    "downlevel-dts": "0.7.0",
     "jest": "^26.1.0",
     "rimraf": "^3.0.0",
     "typedoc": "^0.19.2",
@@ -36,5 +38,10 @@
   },
   "engines": {
     "node": ">=10.0.0"
+  },
+  "typesVersions": {
+    "<3.9": {
+      "types/*": ["types/ts3.4/*"]
+    }
   }
 }