diff --git a/app/data/ct.libs/transition/types.d.ts b/app/data/ct.libs/transition/types.d.ts
new file mode 100644
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+++ b/app/data/ct.libs/transition/types.d.ts
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+type CtTransitionDirection = 'left' | 'right' | 'top' | 'bottom';
+
+declare namespace ct {
+    /**
+     * Allows you to create transitions between rooms, or whenever you need them.
+     */
+    namespace transition {
+        /**
+         * The beginning of a fading transition, which paints the whole screen through time.
+         * The arguments `duration` and `color` are optional,
+         * and default to `500` (0.5 seconds) and `0x000000` (black color).
+         */
+        function fadeOut(duration: number, color: number): Promise<void>;
+        /**
+         * The end of a fading transition. The arguments `duration` and `color` are optional,
+         * and default to `500` (0.5 seconds) and `0x000000` (black color).
+         */
+        function fadeIn(duration: number, color: number): Promise<void>;
+
+        /**
+         * Scales the camera by a given coefficient while also fading to a specified color
+         * (similar to `ct.transition.fadeOut`). The default `scaling` is `0.1`,
+         * which will zoom in 10 times. Setting values larger than `1` will zoom out instead.
+         * The arguments `duration` and `color` are optional, and default to `500` (0.5 seconds)
+         * and `0x000000` (black color).
+         */
+        function scaleOut(duration: number, scaling: number, color: number): Promise<void>;
+        /**
+         * Scales the camera by a given coefficient and turns back to normal,
+         * while also fading in from a specified color (similar to `ct.transition.fadeIn`).
+         * The default `scaling` is `0.1`, which will zoom in 10 times. Setting values larger
+         * than `1` will zoom out instead. The arguments `duration` and `color` are optional,
+         * and default to `500` (0.5 seconds) and `0x000000` (black color).
+         */
+        function scaleIn(duration: number, scaling: number, color: number): Promise<void>;
+
+        /**
+         * The beginning of a sliding transition. A rectangle will smoothly move
+         * from one edge of the screen to the opposite, in the given direction,
+         * covering the screen with an opaque color.
+         * The arguments `duration` and `color` are optional, and
+         * default to `500` (0.5 seconds) and `0x000000` (black color).
+         */
+        function slideOut(duration: number, direction: CtTransitionDirection, color: number): Promise<void>;
+        /**
+         * The end of a sliding transition. A rectangle will smoothly move
+         * from one edge of the screen to the opposite, in the given direction,
+         * covering the screen with an opaque color.
+         * The arguments `duration` and `color` are optional,
+         * and default to `500` (0.5 seconds) and `0x000000` (black color).
+         */
+        function slideIn(duration: number, direction: CtTransitionDirection, color: number): Promise<void>;
+
+        /**
+         * The beginning of a circle-shaped transition. This will create a circle
+         * that smoothly grows from a size of a point to cover the whole screen
+         * in a given opaque color. The arguments `duration` and `color` are optional,
+         * and default to `500` (0.5 seconds) and `0x000000` (black color).
+         */
+        function circleOut(duration: number, color: number): Promise<void>;
+        /**
+         * The end of a circle-shaped transition. This will create a circle
+         * that covers the whole screen in a given opaque color but smoothly
+         * shrinks to a point. The arguments `duration` and `color` are optional,
+         * and default to `500` (0.5 seconds) and `0x000000` (black color).
+         */
+        function circleIn(duration: number, color: number): Promise<void>;
+    }
+
+}
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