Remove logging the origin line in Jest

Question

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

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

Any idea how I can turn it off?

Answer 1

With Jest 24.3.0 or higher, you can do this in pure TypeScript by adding the following to a Jest setup file configured in setupFilesAfterEnv:

import { CustomConsole, LogType, LogMessage } from '@jest/console';

function simpleFormatter(type: LogType, message: LogMessage): string {
    const TITLE_INDENT = '    ';
    const CONSOLE_INDENT = TITLE_INDENT + '  ';

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

global.console = new CustomConsole(process.stdout, process.stderr, simpleFormatter);

Answer 2

Jest injects custom console implementation that is based on extendable Console class into test global scope. Normally it provides useful debugging information alongside printed message that answers the question where potentially unwanted output comes from.

In case this is undesirable for some reason, a simple way to retrieve default console implementation is to import it from Node built-in module.

Can be done for specific console calls:

let console = require('console');    
...
console.log(...)

For many of them that occur inside a range of tests:

const jestConsole = console;

beforeEach(() => {
  global.console = require('console');
});

afterEach(() => {
  global.console = jestConsole;
});

And so on.