Update to @types/rdf-js 4.x

lib/Util.ts

@@ -1,6 +1,7 @@
 import {ContextParser, ERROR_CODES, ErrorCoded, JsonLdContextNormalized,
   Util as ContextUtil} from "jsonld-context-parser";
 import * as RDF from "rdf-js";
+import {DataFactory} from "rdf-data-factory";
 import {EntryHandlerContainer} from "./entryhandler/EntryHandlerContainer";
 import {ParsingContext} from "./ParsingContext";
 
@@ -29,7 +30,7 @@ export class Util {
 
   constructor(options: { parsingContext: ParsingContext, dataFactory?: RDF.DataFactory<RDF.BaseQuad> }) {
     this.parsingContext = options.parsingContext;
-    this.dataFactory = options.dataFactory || require('@rdfjs/data-model');
+    this.dataFactory = options.dataFactory || new DataFactory();
 
     this.rdfFirst = this.dataFactory.namedNode(Util.RDF + 'first');
     this.rdfRest = this.dataFactory.namedNode(Util.RDF + 'rest');

package.json

@@ -29,13 +29,13 @@
     "index.js"
   ],
   "dependencies": {
-    "@rdfjs/data-model": "^1.1.2",
     "@types/http-link-header": "^1.0.1",
-    "@types/rdf-js": "^3.0.0",
+    "@types/rdf-js": "*",
     "http-link-header": "^1.0.2",
     "canonicalize": "^1.0.1",
     "jsonld-context-parser": "^2.0.1",
-    "jsonparse": "^1.3.1"
+    "jsonparse": "^1.3.1",
+    "rdf-data-factory": "^1.0.2"
   },
   "pre-commit": [
     "build",
@@ -46,19 +46,20 @@
     "@types/jest": "^26.0.0",
     "@types/jest-each": "^24.3.0",
     "@types/node": "^13.1.0",
+    "@types/rdf-js": "^4.0.0",
     "arrayify-stream": "^1.0.0",
     "coveralls": "^3.0.0",
     "jest": "^26.0.0",
     "jest-each": "^26.0.0",
-    "jest-rdf": "^1.3.0",
+    "jest-rdf": "^1.6.0",
     "manual-git-changelog": "^1.0.1",
     "pre-commit": "^1.2.2",
-    "rdf-test-suite": "^1.13.1",
+    "rdf-test-suite": "^1.13.4",
     "streamify-string": "^1.0.1",
     "ts-jest": "^26.0.0",
     "tslint": "^6.0.0",
     "tslint-eslint-rules": "^5.3.1",
-    "typescript": "^3.3.1"
+    "typescript": "^4.0.2"
   },
   "jest": {
     "globals": {