method OptionAbstract.prototype.amimport { OptionAbstract } from "https://deno.land/x/careful@v0.1.0/mod.ts"; am<NT>(cb: (v: T) => Promise<NT>): Promise<OptionAbstract<T> | OptionAbstract<NT>>Type ParametersNTParameterscb: (v: T) => Promise<NT>ReturnsPromise<OptionAbstract<T> | OptionAbstract<NT>>