Add more line of sight methods

paper-api/src/main/java/org/bukkit/RegionAccessor.java

@@ -461,5 +461,13 @@ public interface RegionAccessor extends Keyed { // Paper
     @NotNull
     @Override
     NamespacedKey getKey();
+
+    /**
+     * Tell whether a line of sight exists between the given locations
+     * @param from Location to start at
+     * @param to target Location
+     * @return whether a line of sight exists between {@code from} and {@code to}
+     */
+    public boolean lineOfSightExists(@NotNull Location from, @NotNull Location to);
     // Paper end
 }

paper-api/src/main/java/org/bukkit/entity/LivingEntity.java

@@ -622,6 +622,19 @@ public interface LivingEntity extends Attributable, Damageable, ProjectileSource
      */
     public boolean hasLineOfSight(@NotNull Entity other);
 
+    // Paper start
+    /**
+     * Checks whether the living entity has block line of sight to the given block.
+     * <p>
+     * This uses the same algorithm that hostile mobs use to find the closest
+     * player.
+     *
+     * @param location the location to determine line of sight to
+     * @return true if there is a line of sight, false if not
+     */
+    public boolean hasLineOfSight(@NotNull Location location);
+    // Paper end
+
     /**
      * Returns if the living entity despawns when away from players or not.
      * <p>