How to use the knex/lib/dialects/sqlite3.prototype function in knex

import knexConfig from '../knexfile';

// Converts "camelCase" strings to "snake_case"
const toSnakeCase = (cache => (key: string) => {
  let snakeCaseKey = cache.get(key);
  if (!snakeCaseKey) {
    snakeCaseKey = key.replace(/([A-Z])/g, (_, s) => `_${s.toLowerCase()}`);
    cache.set(key, snakeCaseKey);
  }
  return snakeCaseKey;
})(new Map());

// Automatically convert "camelCase" identifiers to "snake_case". For example:
//   db.table('users').where('userId', '=', 1).update({ firstName: 'Bill' })
//   => UPDATE "users" SET "first_name" = ? WHERE "user_id" = ?
Client.prototype.wrapIdentifier = value => {
  if (value === '*') return value;
  const matched = value.match(/(.*?)(\[[0-9]\])/);
  if (matched)
    return (
      Client.prototype.wrapIdentifier.wrapIdentifier(matched[1]) + matched[2]
    );
  return `"${toSnakeCase(value).replace(/"/g, '""')}"`;
};

// The above should not apply to the "as " identifiers. For example:
// db.table('users').select('user_id as userId') => SELECT "user_id" as "userId" from "users"
Formatter.prototype.wrapAsIdentifier = value =>
  `"${(value || '').replace(/"/g, '""')}"`;

const config: Object = {
  acquireConnectionTimeout: 60000,

Client.prototype.wrapIdentifier = value => {
  if (value === '*') return value;
  const matched = value.match(/(.*?)(\[[0-9]\])/);
  if (matched)
    return (
      Client.prototype.wrapIdentifier.wrapIdentifier(matched[1]) + matched[2]
    );
  return `"${toSnakeCase(value).replace(/"/g, '""')}"`;
};