Stub out PHPism and FBLogger

src/keyset/transform.php

@@ -11,6 +11,10 @@
 
 namespace HH\Lib\Keyset;
 
+// @oss-disable: use \PHPism_FIXME as PHPism_FIXME;
+use HH\Lib\_Private\StubPHPism_FIXME as PHPism_FIXME; // @oss-enable
+use function HH\Lib\_Private\universal_chainable_stub as FBLogger; // @oss-enable
+
 /**
  * Returns a vec containing the given Traversable split into chunks of the
  * given size.
@@ -78,7 +82,7 @@ function flatten<Tv as arraykey>(
 ): keyset<Tv> {
   $result = keyset[];
   foreach ($traversables as $traversable) {
-    if (!\PHPism_FIXME::isForeachable($traversable)) {
+    if (!PHPism_FIXME::isForeachable($traversable)) {
       FBLogger('phpism_fixme.invalid_foreach_arg')
         ->blameToPreviousFrame()
         ->mustfix('Attempting to foreach over a non-foreachable type');

src/private.php

@@ -33,3 +33,21 @@ function validate_offset(
 
 const string ALPHABET_ALPHANUMERIC =
   '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
+
+// Stub implementations of FB internals used to ease migrations
+
+final class StubPHPism_FIXME {
+  public static function isForeachable<T>(Traversable<T> $_): bool {
+    return true;
+  }
+}
+
+final class UniversalChainableStub {
+  public function __call(mixed $_, mixed $_): this {
+    return $this;
+  }
+}
+
+function universal_chainable_stub(mixed ...$_): UniversalChainableStub {
+  return new UniversalChainableStub();
+}