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Showing content from https://developer.mozilla.org/es/docs/Web/JavaScript/Reference/Global_Objects/Map/delete below:

Map.prototype.delete() - JavaScript | MDN

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El método delete() de las instancias Map remueve el elemento especificado de este map utilizando la llave del elemento que se quiere remover.

const map1 = new Map();
map1.set("bar", "foo");

console.log(map1.delete("bar"));
// Expected result: true
// True indicates successful removal

console.log(map1.has("bar"));
// Expected result: false

key

La llave de el elemento que se va a remover del objeto Map.

true si un elemento en el objeto Map existía y fué removido, o false si el elemento no existe.

const myMap = new Map();
myMap.set("bar", "foo");

console.log(myMap.delete("bar")); // Regresa true. Removido exitosamente.
console.log(myMap.has("bar")); // Regresa false. El elemento "bar" ya no esta presente.

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