start from quads, not undefined

package.json

@@ -1,6 +1,6 @@
 {
   "name": "rdf-lens",
-  "version": "1.3.2",
+  "version": "1.3.3",
   "main": "./dist/index.js",
   "type": "module",
   "exports": {

src/lens.ts

@@ -162,12 +162,13 @@ export class BasicLensM<C, T> extends BasicLens<C, T[]> {
 
     reduce<F>(
         lens: BasicLens<[T, F], F>,
-        start: BasicLens<T[], F>,
+        start: BasicLens<C, F>,
     ): BasicLens<C, F> {
         return new BasicLens((c, _, states) => {
-            const st = this.then(empty<T[]>().and(start)).map(([ts, f]) => {
+            const st = this.and(start).map(([ts, f]) => {
                 return ts.reduce((acc, v) => lens.execute([v, acc], states), f);
             });
+
             return st.execute(c, states);
         });
     }

src/shacl.ts

@@ -408,10 +408,7 @@ export function envReplace(): BasicLens<Quad[], Quad[]> {
         RDFL.terms.EnvVariable,
     )
         .thenAll(subject)
-        .reduce(
-            reduce,
-            empty<Cont[]>().map((x) => x[0].quads),
-        );
+        .reduce(reduce, empty<Quad[]>());
 
     return sliced().then(actualReplace);
 }

test/shacl2.test.ts

@@ -568,11 +568,12 @@ ${prefixes}
     describe("Env replace works", () => {
         const data = `
 ${prefixes}
+<a> <b> <c>.
 <1> js:test [
     a rdfl:EnvVariable;
     rdfl:envDefault js:generatedAtTime;
     rdfl:envKey "key1"
-  ].
+  ], <c>.
 
 <2> js:test [
     a rdfl:EnvVariable;
@@ -603,7 +604,7 @@ ${prefixes}
         });
 
         test("Did change new quads", () => {
-            expect(newQuads.length).toBe(3);
+            expect(newQuads.length).toBe(5);
         });
 
         test("Datatype defaults to literal", () => {
@@ -625,5 +626,10 @@ ${prefixes}
                 "https://w3id.org/conn/js#generatedAtTime",
             );
         });
+
+        test("Doesnt fail when no env to replace", () => {
+            const newNewQuads = envReplace().execute(newQuads);
+            expect(newNewQuads.length).toBe(newQuads.length);
+        });
     });
 });