openzeppelin-contracts/scripts/generate/templates/EnumerableMap.opts.js

const mapType = str => (str == 'uint256' ? 'Uint' : `${str.charAt(0).toUpperCase()}${str.slice(1)}`);
const formatType = (keyType, valueType) => ({
  name: `${mapType(keyType)}To${mapType(valueType)}Map`,
  keyType,
  valueType,
});

const TYPES = [
  ['uint256', 'uint256'],
  ['uint256', 'address'],
  ['address', 'uint256'],
  ['bytes32', 'uint256'],
].map(args => formatType(...args));

module.exports = {
  TYPES,
  formatType,
};