deno/cli/tsc/dts/lib.es2022.string.d.ts

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/// <reference no-default-lib="true"/>

interface String {
    /**
     * Returns a new String consisting of the single UTF-16 code unit located at the specified index.
     * @param index The zero-based index of the desired code unit. A negative index will count back from the last item.
     */
    at(index: number): string | undefined;
}