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https://github.com/facebook/react-native.git
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Christoph Nakazawa
db9fc38893
Summary: People ask "How do you use `console.log` with React Native?" and there is no good answer. This diff aims to stop people from asking this question. See https://fb.workplace.com/groups/rn.core/permalink/2372327062999018/ for context. This logging relies on network requests which can cause logs to show up out-of-order. To reduce the likelihood I queue every log message on the server for a maximum of 200ms. There could be other methods, like using websocket, but that seems more complex than is necessary at least in the beginning. I considered various throttling strategies because this could be quite chatty and possibly problematic, however I think we can just ship this and iterate based on feedback. On my very underpowered laptop I logged a random number every 10 milliseconds and it didn't cause any issues or slowdown. Reviewed By: gaearon Differential Revision: D15559151 fbshipit-source-id: 552001622af0937ae3a37d2bd8c1b96e7ca52020
34 lines
680 B
JavaScript
34 lines
680 B
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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* @flow strict-local
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*/
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'use strict';
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const getDevServer = require('./getDevServer');
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let ID = 0;
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function logToConsole(
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level: 'trace' | 'info' | 'warn' | 'log',
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data: Array<mixed>,
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) {
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let body;
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try {
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body = JSON.stringify({id: ID++, level, data});
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} catch (error) {
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body = JSON.stringify({id: ID++, level, data: [error.message]});
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}
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fetch(getDevServer().url + 'log-to-console', {
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method: 'POST',
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body,
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});
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}
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module.exports = logToConsole;
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