Source: generator.js

'use strict';

const path = require('path');

const DEFAULT_PREFIX = 'NODE_APP';
const DEFAULT_NO_PREFIX = false;
const PACKAGE_NAME_PREFIX_PLACEHOLDER = '@';
const DEFAULT_SEPARATOR = '_';
const CASING_UPPER = 'upper';
const CASING_LOWER = 'lower';
const CASING_UNCHANGED = 'unchanged';
const DEFAULT_CASING = CASING_UPPER;
const DEFAULT_EMPTIES = false;
/**
 * Generates an object suitable for use with [config](https://npmjs.com/package/config)'s `config/custom-environment-variables.json`, skipping any functions encountered in the given object.
 * Example:
 * ```
 *   const fs = require('fs');
 *   const config = require('config');
 *   const cev = require('config-custom-environment-variables-generator');
 *   fs.writeFileSync('config/custom-environment-variables.json', JSON.stringify(cev.generate(config, { prefix: 'MYAPP' }), null, 2)));
 * ```
 * @param {object} obj An object, most likely the one returned by `require('config')`.
 * @param {string} [opts.prefix='NODE_APP'] Prefix to use on environment variables.  Use `@` to use the name of your application (see exported `DEFAULT_PREFIX`).
 * @param {boolean} [opts.noPrefix=false] Overrides use of any prefix (see exported `DEFAULT_NO_PREFIX`).
 * @param {separator} [opts.separator='_'] The word separator in environment variables (see exported `DEFAULT_SEPARATOR`).
 * @param {'upper'|'lower'|undefined} [opts.casing='upper'] The case to use.  `upper` forces upper case, `lower` forces lower case, else case is unchanged (see exported `DEFAULT_CASING`, `CASING_UPPER`, `CASING_LOWER`, and `CASING_UNCHANGED`).
 * @param {boolean} [opts.empties=false] If `true`, preserves empty objects that didn't have any environment variables, else skips entries that wouldn't have any environment variables (functions are always skipped).
 * @param {object} [opts.formats={}] If given, must be an object that specifies the __format value for the corresponding key of the first argument,
 * @returns {object} An object containing the generated environment variables for each key in the input object.
 */

const generate = function generate(obj, opts) {
  obj = obj || {};
  opts = opts || {};
  opts.formats = opts.formats || {};
  let prefix = '';
  const noPrefix = opts.noPrefix;

  if (!noPrefix) {
    prefix = opts.prefix || module.exports.DEFAULT_PREFIX;

    if (prefix === PACKAGE_NAME_PREFIX_PLACEHOLDER) {
      prefix = require(path.resolve('package.json')).name;
    }
  }

  const separator = opts.separator || module.exports.DEFAULT_SEPARATOR;
  const keys = Object.keys(opts);
  const casing = keys.indexOf('casing') === -1 ? DEFAULT_CASING : opts.casing.toString().toLowerCase();
  const empties = keys.indexOf('empties') === -1 ? DEFAULT_EMPTIES : !!opts.empties;
  const vars = {};
  Object.keys(obj).forEach(function (key) {
    if (obj[key] instanceof Function) {
      return null; // skip
    }

    if (obj[key] instanceof Object) {
      // recurse
      const pre = applyCasing((prefix ? prefix + separator : '') + key, casing);
      vars[key] = generate(obj[key], {
        prefix: pre,
        separator: separator,
        casing: casing,
        empties: empties,
        formats: opts.formats[key]
      });
      if (!Object.keys(vars[key]).length && !empties) delete vars[key];
    } else {
      // add
      const v = applyCasing((prefix ? prefix + separator : '') + key, casing); // support __format feature

      if (opts.formats[key]) {
        vars[key] = {
          __name: v,
          __format: opts.formats[key]
        };
      } else {
        vars[key] = v;
      }
    }
  });
  return vars;
};

function applyCasing(value, casing) {
  value = value.toString();

  switch (casing) {
    case CASING_UPPER:
      return value.toUpperCase();

    case CASING_LOWER:
      return value.toLowerCase();

    default:
      // CASING_UNCHANGED
      return value;
  }
}

module.exports = generate;
module.exports.generate = generate;
module.exports.DEFAULT_PREFIX = DEFAULT_PREFIX;
module.exports.DEFAULT_NO_PREFIX = DEFAULT_NO_PREFIX;
module.exports.DEFAULT_SEPARATOR = DEFAULT_SEPARATOR;
module.exports.DEFAULT_EMPTIES = DEFAULT_EMPTIES;
module.exports.DEFAULT_CASING = DEFAULT_CASING;
module.exports.CASING_UPPER = CASING_UPPER;
module.exports.CASING_LOWER = CASING_LOWER;
module.exports.CASING_UNCHANGED = CASING_UNCHANGED;
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Use `@` to use the name of your application (see exported `DEFAULT_PREFIX`).\n * @param {boolean} [opts.noPrefix=false] Overrides use of any prefix (see exported `DEFAULT_NO_PREFIX`).\n * @param {separator} [opts.separator='_'] The word separator in environment variables (see exported `DEFAULT_SEPARATOR`).\n * @param {'upper'|'lower'|undefined} [opts.casing='upper'] The case to use.  `upper` forces upper case, `lower` forces lower case, else case is unchanged (see exported `DEFAULT_CASING`, `CASING_UPPER`, `CASING_LOWER`, and `CASING_UNCHANGED`).\n * @param {boolean} [opts.empties=false] If `true`, preserves empty objects that didn't have any environment variables, else skips entries that wouldn't have any environment variables (functions are always skipped).\n * @param {object} [opts.formats={}] If given, must be an object that specifies the __format value for the corresponding key of the first argument,\n * @returns {object} An object containing the generated environment variables for each key in the input object.\n */\nconst generate = function generate (obj, opts) {\n  obj = obj || {}\n  opts = opts || {}\n  opts.formats = opts.formats || {}\n\n  let prefix = ''\n  const noPrefix = opts.noPrefix\n  if (!noPrefix) {\n    prefix = opts.prefix || module.exports.DEFAULT_PREFIX\n    if (prefix === PACKAGE_NAME_PREFIX_PLACEHOLDER) {\n      prefix = require(path.resolve('package.json')).name\n    }\n  }\n  const separator = opts.separator || module.exports.DEFAULT_SEPARATOR\n  const keys = Object.keys(opts)\n  const casing = keys.indexOf('casing') === -1\n    ? DEFAULT_CASING\n    : opts.casing.toString().toLowerCase()\n  const empties = keys.indexOf('empties') === -1\n    ? DEFAULT_EMPTIES\n    : (!!opts.empties)\n\n  const vars = {}\n\n  Object.keys(obj).forEach(function (key) {\n    if ((obj[key] instanceof Function)) {\n      return null // skip\n    }\n\n    if (obj[key] instanceof Object) { // recurse\n      const pre = applyCasing((prefix ? (prefix + separator) : '') + key, casing)\n      vars[key] = generate(obj[key], {\n        prefix: pre,\n        separator: separator,\n        casing: casing,\n        empties: empties,\n        formats: opts.formats[key]\n      })\n      if ((!Object.keys(vars[key]).length) && !empties) delete vars[key]\n    } else { // add\n      const v = applyCasing((prefix ? prefix + separator : '') + key, casing)\n      // support __format feature\n      if (opts.formats[key]) {\n        vars[key] = {\n          __name: v,\n          __format: opts.formats[key]\n        }\n      } else {\n        vars[key] = v\n      }\n    }\n  })\n  return vars\n}\n\nfunction applyCasing (value, casing) {\n  value = value.toString()\n  switch (casing) {\n    case CASING_UPPER:\n      return value.toUpperCase()\n    case CASING_LOWER:\n      return value.toLowerCase()\n    default: // CASING_UNCHANGED\n      return value\n  }\n}\n\nmodule.exports = generate\nmodule.exports.generate = generate\nmodule.exports.DEFAULT_PREFIX = DEFAULT_PREFIX\nmodule.exports.DEFAULT_NO_PREFIX = DEFAULT_NO_PREFIX\nmodule.exports.DEFAULT_SEPARATOR = DEFAULT_SEPARATOR\nmodule.exports.DEFAULT_EMPTIES = DEFAULT_EMPTIES\nmodule.exports.DEFAULT_CASING = DEFAULT_CASING\nmodule.exports.CASING_UPPER = CASING_UPPER\nmodule.exports.CASING_LOWER = CASING_LOWER\nmodule.exports.CASING_UNCHANGED = CASING_UNCHANGED\n"]}