删除在Jest中记录原始线

问题描述

Jest具有此功能，可以记录输出到console方法的行.

Jest has this feature to log the line that outputs to console methods.

在某些情况下，这可能会很烦人:

In some cases, this can become annoying:

  console.log _modules/log.js:37
  ℹ login.0 screenshot start

  console.time _modules/init.js:409
  login.0.screenshot: 0.33ms

  console.time _modules/init.js:394
  0 | login.0: 0.524ms

  console.log _modules/log.js:37
  ℹ login.1 screenshot start

有什么主意我可以将其关闭吗?

Any idea how I can turn it off?

推荐答案

查看源代码，似乎没有一种巧妙的方法可以关闭这些消息.

Looking at the source code for Jest, it doesn't seem like there is a neat way to turn those messages off.

但是，一种可能的解决方案是编写您自己的控制台.在这里，我使用了 Console.js 从Jest开始，然后创建SimpleConsole来满足您的需要(为简单起见，我删除了一些终端着色功能，但您可以自己添加它们).

However, one possible solution could be to write your own Console. Here I have used Console.js from Jest as a starting ground, and then created SimpleConsole which does what you need (I have removed some terminal coloring features for simplicity, but you could just add them yourself).

一旦添加到项目中，您可以在运行测试之前用自己的Jest普通控制台覆盖它:

Once added to your project, you can overwrite Jest's normal console with your own before running the tests:

const { SimpleConsole } = require('./SimpleConsole');
global.console = new SimpleConsole(process.stdout, process.stderr);

我制作了一个 REPL 来展示它的作用.

I have made a REPL that shows it in action.

SimpleConsole的源代码:

const path = require('path');
const assert = require('assert');
const {format} = require('util');
const {Console} = require('console');

function simpleFormatter() {
  const TITLE_INDENT = '    ';
  const CONSOLE_INDENT = TITLE_INDENT + '  ';

  return (type, message) => {
    message = message
      .split(/\n/)
      .map(line => CONSOLE_INDENT + line)
      .join('\n');

    return (
      message +
      '\n'
    );
  };
};

class SimpleConsole extends Console {
  constructor(stdout, stderr, formatBuffer) {
    super(stdout, stderr);
    this._formatBuffer = formatBuffer || simpleFormatter();
    this._counters = {};
    this._timers = {};
    this._groupDepth = 0;
  }

  _logToParentConsole(message) {
    super.log(message);
  }

  _log(type, message) {
    if (process.stdout.isTTY) {
      this._stdout.write('\x1b[999D\x1b[K');
    }
    this._logToParentConsole(
      this._formatBuffer(type, '  '.repeat(this._groupDepth) + message),
    );
  }

  assert(...args) {
    try {
      assert(...args);
    } catch (error) {
      this._log('assert', error.toString());
    }
  }

  count(label = 'default') {
    if (!this._counters[label]) {
      this._counters[label] = 0;
    }

    this._log('count', format(`${label}: ${++this._counters[label]}`));
  }

  countReset(label = 'default') {
    this._counters[label] = 0;
  }

  debug(...args) {
    this._log('debug', format(...args));
  }

  dir(...args) {
    this._log('dir', format(...args));
  }

  dirxml(...args) {
    this._log('dirxml', format(...args));
  }

  error(...args) {
    this._log('error', format(...args));
  }

  group(...args) {
    this._groupDepth++;

    if (args.length > 0) {
      this._log('group', chalk.bold(format(...args)));
    }
  }

  groupCollapsed(...args) {
    this._groupDepth++;

    if (args.length > 0) {
      this._log('groupCollapsed', chalk.bold(format(...args)));
    }
  }

  groupEnd() {
    if (this._groupDepth > 0) {
      this._groupDepth--;
    }
  }

  info(...args) {
    this._log('info', format(...args));
  }

  log(...args) {
    this._log('log', format(...args));
  }

  time(label = 'default') {
    if (this._timers[label]) {
      return;
    }

    this._timers[label] = new Date();
  }

  timeEnd(label = 'default') {
    const startTime = this._timers[label];

    if (startTime) {
      const endTime = new Date();
      const time = endTime - startTime;
      this._log('time', format(`${label}: ${time}ms`));
      delete this._timers[label];
    }
  }

  warn(...args) {
    this._log('warn', format(...args));
  }

  getBuffer() {
    return null;
  }
}

module.exports.SimpleConsole = SimpleConsole;

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