luci-base: luci.js: add Promise.finally polyfill
Fixes: #2854 Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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@ -23,6 +23,20 @@
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/* Promise.finally polyfill */
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if (typeof Promise.prototype.finally !== 'function') {
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Promise.prototype.finally = function(fn) {
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var onFinally = function(cb) {
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return Promise.resolve(fn.call(this)).then(cb);
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};
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return this.then(
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function(result) { return onFinally.call(this, function() { return result }) },
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function(reason) { return onFinally.call(this, function() { return Promise.reject(reason) }) }
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);
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};
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}
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/*
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* Class declaration and inheritance helper
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*/
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