+layer_state_t layer_state_set_user(layer_state_t state);
+layer_state_t layer_state_set_kb(layer_state_t state);
+
+/* pressed actions cache */
+#if !defined(NO_ACTION_LAYER) && !defined(STRICT_LAYER_RELEASE)
+/* The number of bits needed to represent the layer number: log2(32). */
+#define MAX_LAYER_BITS 5
+void update_source_layers_cache(keypos_t key, uint8_t layer);
+uint8_t read_source_layers_cache(keypos_t key);
+#endif
+action_t store_or_get_action(bool pressed, keypos_t key);
+
+/* return the topmost non-transparent layer currently associated with key */
+uint8_t layer_switch_get_layer(keypos_t key);