37 lines
779 B
JavaScript
37 lines
779 B
JavaScript
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/*
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* MIT License http://opensource.org/licenses/MIT
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* Author: Ben Holloway @bholloway
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*/
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'use strict';
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var stream = require('stream');
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var hasLogged = false;
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function logToTestHarness(maybeStream, options) {
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var doLogging =
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!hasLogged &&
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!!maybeStream &&
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(typeof maybeStream === 'object') &&
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(maybeStream instanceof stream.Writable);
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if (doLogging) {
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hasLogged = true; // ensure we log only once
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Object.keys(options).forEach(eachOptionKey);
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}
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function eachOptionKey(key) {
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maybeStream.write(key + ': ' + stringify(options[key]) + '\n');
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}
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function stringify(value) {
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try {
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return JSON.stringify(value) || String(value);
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} catch (e) {
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return '-unstringifyable-';
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}
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}
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}
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module.exports = logToTestHarness;
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