esdoc-plugin-async-to-sync

This plugin copies documentation from the async version of methods to their sync equivalent, so that you don't have to write the same documentation twice constantly.

For example:

/**
 * Gets a file from disk.
 *
 * @param {string} file The path to the file
 *
 * @return {Promise<string>} The contents of the file
 */
async function get(file) {
}

function getSync(file) {
}

Now becomes to ESDoc as if you had written:

/**
 * Gets a file from disk.
 *
 * @param {string} file The path to the file
 *
 * @return {Promise<string>} The contents of the file
 */
async function get(file) {
}

/**
 * Gets a file from disk.
 *
 * @param {string} file The path to the file
 *
 * @return {string} The contents of the file
 */
function getSync(file) {
}

Documentation substitution occurs if:

1. The method name ends in 'Sync'
2. There is a method with the same name sans-'Sync'
3. The sync method doesn't have documentation and the async one does

Does this handle callbacks?

Ugh no, PRs welcome