fix: list related primops

nix-js/runtime-ts/src/builtins/list.ts

@@ -5,17 +5,30 @@
 
 import type { NixValue, NixList, NixAttrs } from "../types";
 import { force } from "../thunk";
-import { forceList, forceFunction, forceInt } from "../type-assert";
+import { forceList, forceFunction, forceInt, forceBool } from "../type-assert";
+import { op } from "../operators";
 
 export const map =
   (f: NixValue) =>
-  (list: NixValue): NixList =>
-    forceList(list).map(forceFunction(f));
+  (list: NixValue): NixList => {
+    const forcedList = forceList(list);
+    if (forcedList.length) {
+      const func = forceFunction(f);
+      return forcedList.map(func);
+    }
+    return [];
+  };
 
 export const filter =
   (f: NixValue) =>
-  (list: NixValue): NixList =>
-    forceList(list).filter(forceFunction(f));
+  (list: NixValue): NixList => {
+    const forcedList = forceList(list);
+    if (forcedList.length) {
+      const func = forceFunction(f);
+      return forcedList.filter((e) => forceBool(func(e)));
+    }
+    return [];
+  };
 
 export const length = (e: NixValue): bigint => {
   const forced = force(e);
@@ -30,7 +43,7 @@ export const tail = (list: NixValue): NixList => forceList(list).slice(1);
 export const elem =
   (x: NixValue) =>
   (xs: NixValue): boolean =>
-    forceList(xs).includes(force(x));
+    forceList(xs).find((e) => op.eq(x, e)) !== undefined;
 
 export const elemAt =
   (xs: NixValue) =>
@@ -116,10 +129,22 @@ export const genList =
 
 export const all =
   (pred: NixValue) =>
-  (list: NixValue): boolean =>
-    forceList(list).every(forceFunction(pred));
+  (list: NixValue): boolean => {
+    const forcedList = forceList(list);
+    if (forcedList.length) {
+      const f = forceFunction(pred);
+      return forcedList.every((e) => forceBool(f(e)));
+    }
+    return true;
+  };
 
 export const any =
   (pred: NixValue) =>
-  (list: NixValue): boolean =>
-    forceList(list).some(forceFunction(pred));
+  (list: NixValue): boolean => {
+    const forcedList = forceList(list);
+    if (forcedList.length) {
+      const f = forceFunction(pred);
+      return forcedList.some((e) => forceBool(f(e)));
+    }
+    return true;
+  };