resolve is impure

bower.json

@@ -19,6 +19,9 @@
     "gulpfile.js",
     "package.json"
   ],
+  "dependencies": {
+    "purescript-effect": "^2.0.0"
+  },
   "devDependencies": {
     "purescript-assert": "^4.0.0",
     "purescript-console": "^4.1.0"

src/Node/Path.js

@@ -10,7 +10,9 @@ exports.concat = function (segments) {
 
 exports.resolve = function (from) {
   return function (to) {
-    return path.resolve.apply(this, from.concat([to]));
+    return function () {
+      return path.resolve.apply(this, from.concat([to]));
+    };
   };
 };
 

src/Node/Path.purs

@@ -1,5 +1,8 @@
 module Node.Path where
 
+-- | Type for strings representing file paths.
+import Effect (Effect)
+
 -- | Type for strings representing file paths.
 type FilePath = String
 
@@ -12,7 +15,7 @@ foreign import normalize :: FilePath -> FilePath
 foreign import concat :: Array FilePath -> FilePath
 
 -- | Resolves `to` to an absolute path ([from...], to).
-foreign import resolve :: Array FilePath -> FilePath -> FilePath
+foreign import resolve :: Array FilePath -> FilePath -> Effect FilePath
 
 -- | Solve the relative path from `from` to `to`.
 foreign import relative :: FilePath -> FilePath -> FilePath

test/Test/Main.purs

@@ -1,29 +1,34 @@
 module Test.Main where
 
 import Prelude
+
 import Effect (Effect)
-import Node.Path (parse, delimiter, normalize, sep, extname, basenameWithoutExt, basename, dirname, relative, concat)
-import Test.Assert (assert)
+import Node.Path (basename, basenameWithoutExt, concat, delimiter, dirname, extname, normalize, parse, relative, resolve, sep)
+import Test.Assert (assert, assertEqual)
 
 main :: Effect Unit
 main = do
-  assert $ normalize "/foo/bar//baz/asdf/quux/.." == normalize "/foo/bar/baz/asdf"
-  assert $ concat ["/foo", "bar"] == normalize "/foo/bar"
-  assert $ relative "/data/orandea/test/aaa" "/data/orandea/impl/bbb" == normalize "../../impl/bbb"
-  assert $ dirname "/foo/bar/baz/asdf/quux" == normalize "/foo/bar/baz/asdf"
-  assert $ basename "/foo/bar/baz/asdf/quux.html" == "quux.html"
-  assert $ basenameWithoutExt "/foo/bar/baz/asdf/quux.html" ".html" == "quux"
-  assert $ basenameWithoutExt "/foo/bar/baz/asdf/quux.txt" ".html" == "quux.txt"
-  assert $ extname "index.html" == ".html"
-  assert $ extname "index.coffee.md" == ".md"
-  assert $ extname "index." == "."
-  assert $ extname "index" == ""
-  assert $ sep == normalize "/"
+  assertEqual { actual: normalize "/foo/bar//baz/asdf/quux/..", expected: normalize "/foo/bar/baz/asdf" }
+  assertEqual { actual: concat ["/foo", "bar"], expected: normalize "/foo/bar" }
+  assertEqual { actual: relative "/data/orandea/test/aaa" "/data/orandea/impl/bbb", expected: normalize "../../impl/bbb" }
+  assertEqual { actual: dirname "/foo/bar/baz/asdf/quux", expected: normalize "/foo/bar/baz/asdf" }
+  assertEqual { actual: basename "/foo/bar/baz/asdf/quux.html", expected: "quux.html" }
+  assertEqual { actual: basenameWithoutExt "/foo/bar/baz/asdf/quux.html" ".html", expected: "quux" }
+  assertEqual { actual: basenameWithoutExt "/foo/bar/baz/asdf/quux.txt" ".html", expected: "quux.txt" }
+  assertEqual { actual: extname "index.html", expected: ".html" }
+  assertEqual { actual: extname "index.coffee.md", expected: ".md" }
+  assertEqual { actual: extname "index.", expected: "." }
+  assertEqual { actual: extname "index", expected: "" }
+  assertEqual { actual: sep, expected: normalize "/" }
   assert $ delimiter == ";" || delimiter == ":"
 
   let path = parse "/home/user/file.js"
-  assert $ path.root == "/"
-  assert $ path.dir == "/home/user"
-  assert $ path.base == "file.js"
-  assert $ path.ext == ".js"
-  assert $ path.name == "file"
+  assertEqual { actual: path.root, expected: "/" }
+  assertEqual { actual: path.dir, expected: "/home/user" }
+  assertEqual { actual: path.base, expected: "file.js" }
+  assertEqual { actual: path.ext, expected: ".js" }
+  assertEqual { actual: path.name, expected: "file" }
+
+  path1 <- resolve ["a"] ""
+  path2 <- resolve ["a"] "."
+  assertEqual { actual: path1, expected: path2 }