Discussion: Scope related filters

[caillou]

I need the keyboard events to trigger within <input> fields for certain scopes. I have come up with the following solution:

const registerKeymasterScopeFilter = require('./register-keymaster-scope-filter');
registerKeymasterScopeFilter('input-scope', (e) => (true));

with the register-keymaster-scope-filter.js module looking as follows:

const keymaster = require('keymaster')
const defaultFilter = keymaster.filter
const scopeFilters = {}

keymaster.filter = (e) => {
  let currentScope = keymaster.getScope()
  let scopeFilter = scopeFilters[currentScope]

  if (typeof scopeFilter === 'function') {
    return scopeFilter(e)
  }

  return defaultFilter(e)
}

module.exports = (scope, filter) => {
  scopeFilters[scope] = filter
}

What are your thoughts on this approach?