@namchee/decora/build/esm/src/benchmark.js

Useful ECMAScript-compliant decorators to enhance JS (specifically, TypeScript) development experience

var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
import { isNode, isBrowser } from './utils';
export function benchmark(metric = 'ms', precision, stream = process.stdout) {
    return function (target, keyName, descriptor) {
        if (!descriptor || !(descriptor.value instanceof Function)) {
            throw new Error('@benchmark decorator can only be applied to functions');
        }
        let logger;
        let performance;
        if (isNode) {
            const Console = require('console').Console;
            logger = new Console({ stdout: stream });
            performance = require('perf_hooks').performance;
        }
        else if (isBrowser) {
            logger = window.console;
            performance = window.performance;
            if (stream) {
                logger.warn('The `stream` option only available on Node.JS environment. This option will be ignored.');
            }
        }
        else {
            return;
        }
        const fn = descriptor.value;
        descriptor.value = function (...args) {
            return __awaiter(this, void 0, void 0, function* () {
                const start = performance.now();
                const result = yield fn.apply(this, args);
                const end = performance.now();
                let diff = end - start;
                if (metric !== 'ms') {
                    diff = metric === 's' ?
                        diff / 1000 :
                        diff * 1000;
                }
                logger.info(`Function ${keyName} from class ${target.constructor.name} was executed in ${diff.toFixed(precision)} ${metric}`);
                return result;
            });
        };
    };
}