source: node_modules/swagger-client/es/execute/oas3/style-serializer.js

const isRfc3986Reserved = char => ":/?#[]@!$&'()*+,;=".indexOf(char) > -1;
const isRrc3986Unreserved = char => /^[a-z0-9\-._~]+$/i.test(char);

// eslint-disable-next-line default-param-last
export function encodeDisallowedCharacters(str, {
  escape
} = {}, parse) {
  if (typeof str === 'number') {
    str = str.toString();
  }
  if (typeof str !== 'string' || !str.length) {
    return str;
  }
  if (!escape) {
    return str;
  }
  if (parse) {
    return JSON.parse(str);
  }

  // In ES6 you can do this quite easily by using the new ... spread operator.
  // This causes the string iterator (another new ES6 feature) to be used internally,
  // and because that iterator is designed to deal with
  // code points rather than UCS-2/UTF-16 code units.
  return [...str].map(char => {
    if (isRrc3986Unreserved(char)) {
      return char;
    }
    if (isRfc3986Reserved(char) && escape === 'unsafe') {
      return char;
    }
    const encoder = new TextEncoder();
    const encoded = Array.from(encoder.encode(char)).map(byte => `0${byte.toString(16).toUpperCase()}`.slice(-2)).map(encodedByte => `%${encodedByte}`).join('');
    return encoded;
  }).join('');
}
export default function stylize(config) {
  const {
    value
  } = config;
  if (Array.isArray(value)) {
    return encodeArray(config);
  }
  if (typeof value === 'object') {
    return encodeObject(config);
  }
  return encodePrimitive(config);
}
function encodeArray({
  key,
  value,
  style,
  explode,
  escape
}) {
  const valueEncoder = str => encodeDisallowedCharacters(str, {
    escape
  });
  if (style === 'simple') {
    return value.map(val => valueEncoder(val)).join(',');
  }
  if (style === 'label') {
    return `.${value.map(val => valueEncoder(val)).join('.')}`;
  }
  if (style === 'matrix') {
    return value.map(val => valueEncoder(val)).reduce((prev, curr) => {
      if (!prev || explode) {
        return `${prev || ''};${key}=${curr}`;
      }
      return `${prev},${curr}`;
    }, '');
  }
  if (style === 'form') {
    const after = explode ? `&${key}=` : ',';
    return value.map(val => valueEncoder(val)).join(after);
  }
  if (style === 'spaceDelimited') {
    const after = explode ? `${key}=` : '';
    return value.map(val => valueEncoder(val)).join(` ${after}`);
  }
  if (style === 'pipeDelimited') {
    const after = explode ? `${key}=` : '';
    return value.map(val => valueEncoder(val)).join(`|${after}`);
  }
  return undefined;
}
function encodeObject({
  key,
  value,
  style,
  explode,
  escape
}) {
  const valueEncoder = str => encodeDisallowedCharacters(str, {
    escape
  });
  const valueKeys = Object.keys(value);
  if (style === 'simple') {
    return valueKeys.reduce((prev, curr) => {
      const val = valueEncoder(value[curr]);
      const middleChar = explode ? '=' : ',';
      const prefix = prev ? `${prev},` : '';
      return `${prefix}${curr}${middleChar}${val}`;
    }, '');
  }
  if (style === 'label') {
    return valueKeys.reduce((prev, curr) => {
      const val = valueEncoder(value[curr]);
      const middleChar = explode ? '=' : '.';
      const prefix = prev ? `${prev}.` : '.';
      return `${prefix}${curr}${middleChar}${val}`;
    }, '');
  }
  if (style === 'matrix' && explode) {
    return valueKeys.reduce((prev, curr) => {
      const val = valueEncoder(value[curr]);
      const prefix = prev ? `${prev};` : ';';
      return `${prefix}${curr}=${val}`;
    }, '');
  }
  if (style === 'matrix') {
    // no explode
    return valueKeys.reduce((prev, curr) => {
      const val = valueEncoder(value[curr]);
      const prefix = prev ? `${prev},` : `;${key}=`;
      return `${prefix}${curr},${val}`;
    }, '');
  }
  if (style === 'form') {
    return valueKeys.reduce((prev, curr) => {
      const val = valueEncoder(value[curr]);
      const prefix = prev ? `${prev}${explode ? '&' : ','}` : '';
      const separator = explode ? '=' : ',';
      return `${prefix}${curr}${separator}${val}`;
    }, '');
  }
  return undefined;
}
function encodePrimitive({
  key,
  value,
  style,
  escape
}) {
  const valueEncoder = str => encodeDisallowedCharacters(str, {
    escape
  });
  if (style === 'simple') {
    return valueEncoder(value);
  }
  if (style === 'label') {
    return `.${valueEncoder(value)}`;
  }
  if (style === 'matrix') {
    return `;${key}=${valueEncoder(value)}`;
  }
  if (style === 'form') {
    return valueEncoder(value);
  }
  if (style === 'deepObject') {
    return valueEncoder(value, {}, true);
  }
  return undefined;
}