denoland-deno/ext/node/polyfills/internal/options.ts

// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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import { getOptions } from "ext:deno_node/internal_binding/node_options.ts";

let optionsMap: Map<string, { value: string }>;

function getOptionsFromBinding() {
  if (!optionsMap) {
    ({ options: optionsMap } = getOptions());
  }

  return optionsMap;
}

export function getOptionValue(optionName: string) {
  const options = getOptionsFromBinding();

  if (optionName.startsWith("--no-")) {
    const option = options.get("--" + optionName.slice(5));

    return option && !option.value;
  }

  return options.get(optionName)?.value;
}