chore: add typesversion to package.json && bump downlevel-dts version (#494)

Author: baileympearson

package-lock.json

@@ -11,10 +11,18 @@
     "src",
     "dist",
     "bson.d.ts",
+    "bson-ts34.d.ts",
     "etc/prepare.js",
     "bower.json"
   ],
   "types": "bson.d.ts",
+  "typesVersions": {
+    "<=4.0.2": {
+      "bson.d.ts": [
+        "bson.ts34.d.ts"
+      ]
+    }
+  },
   "version": "4.6.2",
   "author": {
     "name": "The MongoDB NodeJS Team",
@@ -41,7 +49,7 @@
     "array-includes": "^3.1.3",
     "benchmark": "^2.1.4",
     "chai": "^4.2.0",
-    "downlevel-dts": "^0.7.0",
+    "downlevel-dts": "^0.9.0",
     "eslint": "^7.7.0",
     "eslint-config-prettier": "^6.11.0",
     "eslint-plugin-prettier": "^3.1.4",
@@ -99,7 +107,7 @@
     "test-tsd": "npm run build:dts && tsd",
     "test-browser": "node --max-old-space-size=4096 ./node_modules/.bin/karma start karma.conf.js",
     "build:ts": "tsc",
-    "build:dts": "npm run build:ts && api-extractor run --typescript-compiler-folder node_modules/typescript --local && rimraf 'lib/**/*.d.ts*' && downlevel-dts bson.d.ts bson.d.ts",
+    "build:dts": "npm run build:ts && api-extractor run --typescript-compiler-folder node_modules/typescript --local && rimraf 'lib/**/*.d.ts*' && downlevel-dts bson.d.ts bson-ts34.d.ts",
     "build:bundle": "rollup -c rollup.config.js",
     "build": "npm run build:dts && npm run build:bundle",
     "lint": "eslint -v && eslint --ext '.js,.ts' --max-warnings=0 src test && tsc -v && tsc --noEmit && npm run test-tsd",