mirror of https://github.com/status-im/consul.git
43 lines
1.6 KiB
JavaScript
43 lines
1.6 KiB
JavaScript
import { get, computed } from '@ember/object';
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/**
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* Converts a conventional non-pure Ember `computed` function into a pure one
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* (see https://github.com/emberjs/rfcs/blob/be351b059f08ac0fe709bc7697860d5064717a7f/text/0000-tracked-properties.md#avoiding-dependency-hell)
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*
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* @param {function} computed - a computed function to 'purify' (convert to a pure function)
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* @param {function} filter - Optional string filter function to pre-process the names of computed properties
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* @returns {function} - A pure `computed` function
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*/
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const _success = function(value) {
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return value;
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};
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const purify = function(computed, filter = args => args) {
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return function() {
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let args = [...arguments];
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let success = _success;
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// pop the user function off the end
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if (typeof args[args.length - 1] === 'function') {
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success = args.pop();
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}
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args = filter(args);
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// this is the 'conventional' `computed`
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const cb = function(name) {
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return success.apply(
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this,
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args.map(item => {
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// Right now this just takes the first part of the path so:
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// `items.[]` or `items.@each.prop` etc
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// gives you `items` which is 'probably' what you expect
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// it won't work with something like `item.objects.[]`
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// it could potentially be made to do so, but we don't need that right now at least
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return get(this, item.split('.')[0]);
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})
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);
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};
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// concat/push the user function back on
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return computed(...args.concat([cb]));
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};
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};
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export const subscribe = purify(computed);
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export default purify;
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