Preheat the oven to 325°F (165°C) and line a baking sheet with parchment paper.
In a large bowl, mix shredded coconut, sugar, flour, and salt until well combined.
Add egg whites and vanilla extract; stir until the mixture is sticky and holds together.
Use a small cookie scoop or spoon to form tablespoon-sized mounds on the prepared baking sheet, pressing slightly to form rounded, peaked shapes.
Bake the macaroons for 20 to 25 minutes until edges are lightly golden.
Allow the macaroons to cool on the baking sheet for 10 minutes, then transfer to a wire rack to cool completely.
Melt the dark chocolate using a microwave-safe bowl or double boiler until smooth.
Drizzle the melted chocolate over the cooled macaroons using a spoon or piping bag.
Allow the chocolate to set completely, about 15 to 20 minutes, before serving.