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- Function.prototype.catch = function(callback) {
- const f = this;
- return function(...args) {
- try {
- const v = f.apply(this, args);
- if ('then' in v && 'catch' in v) {
- return v.catch(callback);
- }
- return v;
- } catch (err) {
- return callback(err);
- }
- }
- }
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