Line two baking sheets with parchment paper; set aside.
In small saucepan, combine water, sugar, corn syrup, and salt. Stir over medium‑high heat until sugar dissolves and mixture comes to a boil. Remove from heat.
In a bowl, mix shredded coconut with hot syrup until evenly coated. Let cool about 20 minutes.
While mixture cools, preheat oven to 375°F.
In separate bowl, whisk egg whites and vanilla extract until foamy and thick.
Gently fold in cooled coconut mixture into egg whites.
Use a cookie scoop to form golf‑ball sized mounds of mixture onto parchment‑lined sheets, spacing about 2 inches apart.
Bake for 15‑18 minutes, rotating sheets halfway if needed, until golden brown.
Let macaroons cool completely on racks; store once cooled.