feat(breaking): target node 10

BREAKING CHANGE: stop compiling for, and running on, node 8

Author: FauxFaux

package.json

@@ -21,7 +21,7 @@
     "prepare": "npm run build"
   },
   "engines": {
-    "node": ">=8"
+    "node": ">=10"
   },
   "repository": {
     "type": "git",
@@ -33,7 +33,7 @@
   "devDependencies": {
     "@types/graphlib": "^2.1.7",
     "@types/jest": "^27",
-    "@types/node": "^8",
+    "@types/node": "^10",
     "@types/object-hash": "^2.1.0",
     "@types/semver": "^7.3.6",
     "@typescript-eslint/eslint-plugin": "^4.28.0",

tsconfig.json

@@ -2,9 +2,9 @@
   "compilerOptions": {
     "outDir": "./dist",
     "pretty": true,
-    "target": "es2017",
+    "target": "es2018",
     "lib": [
-      "es2017"
+      "es2018"
     ],
     "allowJs": true,
     "module": "commonjs",