type alias Resultimport { type Result } from "https://dotland.deno.dev/x/somefn@v0.1.1-jsr/ts/error.ts"; [类型] 函数返回结果 Type ParametersToptionalE extends Error = ErroroptionalL extends boolean = truedefinition: L extends true ? [E, null] | [true, null] | [null, T] : [E, null] | [null, T]