function isSymbolimport { isSymbol } from "https://deno.land/x/isx@1.0.0-beta.18/mod.ts"; isSymbol(value: unknown): value is symbolWhether the value is symbol or not. Parametersvalue: unknown Any value. import { isSymbol } from "https://deno.land/x/isx@$VERSION/mod.ts" import { assertEquals } from "https://deno.land/std@$VERSION/testing/asserts.ts" assertEquals(isSymbol(Symbol("symbol")), true) assertEquals(isSymbol(null), false) Returnsvalue is symbol