fix build failure

src/render/canvas/canvas-renderer.ts

@@ -188,7 +188,7 @@ export class CanvasRenderer extends Renderer {
         this.ctx.direction = styles.direction === DIRECTION.RTL ? 'rtl' : 'ltr';
         this.ctx.textAlign = 'left';
         this.ctx.textBaseline = 'alphabetic';
-        const {baseline, middle} = this.fontMetrics.getMetrics(fontFamily, fontSize);
+        const {baseline} = this.fontMetrics.getMetrics(fontFamily, fontSize);
         const paintOrder = styles.paintOrder;
 
         text.textBounds.forEach((text) => {