Merge pull request #538 from zeromq/down-level [skip ci]

Author: aminya

package.json

@@ -17,8 +17,8 @@
     "url": "https://github.com/zeromq/zeromq.js.git"
   },
   "dependencies": {
-    "node-addon-api": "^5.0.0",
     "@aminya/node-gyp-build": "4.5.0-aminya.1",
+    "node-addon-api": "^5.0.0",
     "shelljs": "^0.8.5",
     "shx": "^0.3.4"
   },
@@ -36,6 +36,7 @@
     "chai": ">=4.3",
     "cross-env": "^7.0.3",
     "deasync": "^0.1.28",
+    "downlevel-dts": "^0.11.0",
     "eslint-config-atomic": "^1.18.1",
     "eslint-plugin-prettier": "^4.2.1",
     "fs-extra": "^10.1.0",
@@ -75,7 +76,7 @@
     "install": "(shx test -f ./script/build.js || run-s build.js) && node-gyp-build",
     "clean": "shx rm -rf ./build ./lib/ ./prebuilds",
     "clean.temp": "shx rm -rf ./tmp && shx mkdir -p tmp && shx touch tmp/.gitkeep",
-    "build.library": "shx rm -rf ./lib && tsc -p ./src/tsconfig.json && ts-node ./script/downlevel-dts.ts",
+    "build.library": "shx rm -rf ./lib && tsc -p ./src/tsconfig.json && downlevel-dts ./lib ./lib/ts3.7 --to=3.7",
     "build.script": "tsc -p ./script/tsconfig.json",
     "build.js": "run-p build.script build.library",
     "build.doc": "typedoc --out docs --name zeromq.js --excludeProtected --excludePrivate --excludeNotExported --excludeExternals --externalPattern 'src/+(draft|native|compat).ts' --tsconfig tsconfig-build.json --mode file",