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tiny promisify
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| function promisify(fn) { | |
| return function(...args) { | |
| return new Promise((res, rej) => { | |
| fn(...args, function() { | |
| res(arguments) | |
| }) | |
| }) | |
| } | |
| } | |
| // this could be retrieved in nodejs by | |
| // const { promisify } = require('util') |
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