tests for PoC!

modules/dynamicism/lib.nix

@@ -0,0 +1,24 @@
+{
+  lib ? import <nixpkgs/lib>,
+}: let
+  t = lib.types;
+in lib.fix (self: {
+  /** Perform module-system type checking and resolving on a single option value. */
+  typeCheck = loc: option: value:
+    assert lib.isOptionType option;
+    assert lib.isList loc;
+    assert lib.all lib.isString loc;
+  let
+    merged = lib.modules.mergeDefinitions loc option [ {
+      inherit value;
+      file = "«inline»";
+    } ];
+  in merged.mergedValue;
+
+  /** Either a list of strings, or a dotted string that will be split. */
+  convenientAttrPath = t.coercedTo t.str (lib.splitString ".") (t.listOf t.str);
+
+  concatFoldl = f: list: lib.foldl' (acc: value: acc ++ (f value)) [ ] list;
+  recUpdateFoldl = f: list: lib.foldl' (acc: value: lib.recursiveUpdate acc (f value)) { } list;
+  recUpdateFoldlAttrs = f: attrs: lib.foldlAttrs (acc: name: value: lib.recursiveUpdate acc (f name value)) { } attrs;
+})