test: remove typescript 3.7 compat tests

package.json

@@ -83,8 +83,7 @@
     "install": "(shx test -f ./script/build.js || run-s build.js) && cross-env npm_config_build_from_source=true aminya-node-gyp-build",
     "clean": "shx rm -rf ./build ./lib/ ./prebuilds ./script/*.js ./script/*.js.map ./script/*.d.ts ./script/*.tsbuildinfo",
     "clean.temp": "shx rm -rf ./tmp && shx mkdir -p ./tmp && shx touch ./tmp/.gitkeep",
-    "build.library.compat": "shx rm -rf ./lib/ts3.7 && downlevel-dts ./lib ./lib/ts3.7 --to=3.7",
-    "build.library": "tsc -p ./src/tsconfig.json && run-s build.library.compat",
+    "build.library": "tsc -p ./src/tsconfig.json",
     "build.script": "tsc -p ./script/tsconfig.json && tsc -p ./script/tsconfig.esm.json",
     "build.js": "run-p build.script build.library",
     "build.doc": "typedoc --options ./typedoc.json && minify-all -s docs-raw -d docs --jsCompressor terser",

test/unit/typings-compatibility-test.ts

@@ -23,9 +23,6 @@ import {assert} from "chai"
 type TestDef = {version: string; minTarget: string; requiredLibs?: string[]}
 
 const tsVersions: TestDef[] = [
-  // the oldest supported version
-  {version: "3.7.x", minTarget: "es3"},
-
   // 4.x
   {version: "4.x", minTarget: "es3"},
 ]