Add @rdfjs/serializer-jsonld (#41094)

* Add @rdfjs/serializer-jsonld

* Test sink

types/rdfjs__serializer-jsonld/index.d.ts

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+// Type definitions for @rdfjs/serializer-jsonld 1.2
+// Project: https://github.com/rdfjs-base/serializer-jsonld
+// Definitions by: Chris Wilkinson <https://github.com/thewilkybarkid>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+import { EventEmitter } from 'events';
+import { Sink, Stream } from 'rdf-js';
+
+declare namespace Serializer {
+    interface SerializerOptions {
+        encoding?: 'string' | 'object';
+    }
+}
+
+declare class Serializer implements Sink {
+    constructor(options?: Serializer.SerializerOptions);
+
+    import(stream: Stream, options?: Serializer.SerializerOptions): EventEmitter;
+}
+
+export = Serializer;

types/rdfjs__serializer-jsonld/rdfjs__serializer-jsonld-tests.ts

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+import Serializer = require('@rdfjs/serializer-jsonld');
+import { EventEmitter } from 'events';
+import { Sink, Stream } from 'rdf-js';
+
+const stream: Stream = {} as any;
+
+const serializer1 = new Serializer();
+const serializer2 = new Serializer({});
+const serializer3 = new Serializer({ encoding: 'string' });
+const serializer4 = new Serializer({ encoding: 'object' });
+
+const sink: Sink = serializer1;
+
+const eventEmitter1: EventEmitter = serializer1.import(stream);
+const eventEmitter2: EventEmitter = serializer1.import(stream, {});
+const eventEmitter3: EventEmitter = serializer1.import(stream, { encoding: 'string' });
+const eventEmitter4: EventEmitter = serializer1.import(stream, { encoding: 'object' });

types/rdfjs__serializer-jsonld/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "paths": {
+            "@rdfjs/serializer-jsonld": [
+                "rdfjs__serializer-jsonld"
+            ]
+        }
+    },
+    "files": [
+        "index.d.ts",
+        "rdfjs__serializer-jsonld-tests.ts"
+    ]
+}

types/rdfjs__serializer-jsonld/tslint.json

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+{ "extends": "dtslint/dt.json" }