unjs
🐨 Consola
Elegant Console Wrapper
Why Consola?
👌 Easy to use
💅 Fancy output with fallback for minimal environments
🔌 Pluggable reporters
💻 Consistent command line interface (CLI) experience
🏷 Tag support
🚏 Redirect console and stdout/stderr to consola and easily restore redirect.
🌐 Browser support
⏯ Pause/Resume support
👻 Mocking support
👮♂️ Spam prevention by throttling logs
❯ Interactive prompt support powered by clack
Installation
Using npm:
npm i consolaUsing yarn:
yarn add consolaUsing pnpm:
pnpm i consolaGetting Started
// ESM
import { consola, createConsola } from "consola";
// CommonJS
const { consola, createConsola } = require("consola");
consola.info("Using consola 3.0.0");
consola.start("Building project...");
consola.warn("A new version of consola is available: 3.0.1");
consola.success("Project built!");
consola.error(new Error("This is an example error. Everything is fine!"));
consola.box("I am a simple box");
await consola.prompt("Deploy to the production?", {
type: "confirm",
});Will display in the terminal:
You can use smaller core builds without fancy reporter to save 80% of the bundle size:
import { consola, createConsola } from "consola/basic";
import { consola, createConsola } from "consola/browser";
import { createConsola } from "consola/core";Consola Methods
<type>(logObject) <type>(args...)
Log to all reporters.
Example: consola.info('Message')
await prompt(message, { type, cancel })
Show an input prompt. Type can either of text, confirm, select or multiselect.
If prompt is canceled by user (with Ctrol+C), default value will be resolved by default. This strategy can be configured by setting { cancel: "..." } option:
"default"- Resolve the promise with thedefaultvalue orinitialvalue."undefined" - Resolve the promise withundefined."null"- Resolve the promise withnull."symbol"- Resolve the promise with a symbolSymbol.for("cancel")."reject"- Reject the promise with an error.
See examples/prompt.ts for usage examples.
addReporter(reporter)
- Aliases:
add
Register a custom reporter instance.
removeReporter(reporter?)
- Aliases:
remove,clear
Remove a registered reporter.
If no arguments are passed all reporters will be removed.
setReporters(reporter|reporter[])
Replace all reporters.
create(options)
Create a new Consola instance and inherit all parent options for defaults.
withDefaults(defaults)
Create a new Consola instance with provided defaults
withTag(tag)
- Aliases:
withScope
Create a new Consola instance with that tag.
wrapConsole() restoreConsole()
Globally redirect all console.log, etc calls to consola handlers.
wrapStd() restoreStd()
Globally redirect all stdout/stderr outputs to consola.
wrapAll() restoreAll()
Wrap both, std and console.
console uses std in the underlying so calling wrapStd redirects console too.
Benefit of this function is that things like console.info will be correctly redirected to the corresponding type.
pauseLogs() resumeLogs()
- Aliases:
pause/resume
Globally pause and resume logs.
Consola will enqueue all logs when paused and then sends them to the reported when resumed.
mockTypes
- Aliases:
mock
Mock all types. Useful for using with tests.
The first argument passed to mockTypes should be a callback function accepting (typeName, type) and returning the mocked value:
// Jest
consola.mockTypes((typeName, type) => jest.fn());
// Vitest
consola.mockTypes((typeName, type) => vi.fn());Please note that with the example above, everything is mocked independently for each type. If you need one mocked fn create it outside:
// Jest
const fn = jest.fn();
// Vitest
const fn = vi.fn();
consola.mockTypes(() => fn);If callback function returns a falsy value, that type won't be mocked.
For example if you just need to mock consola.fatal:
// Jest
consola.mockTypes((typeName) => typeName === "fatal" && jest.fn());
// Vitest
consola.mockTypes((typeName) => typeName === "fatal" && vi.fn());NOTE: Any instance of consola that inherits the mocked instance, will apply provided callback again.
This way, mocking works for withTag scoped loggers without need to extra efforts.
Custom Reporters
Consola ships with 3 built-in reporters out of the box. A fancy colored reporter by default and fallsback to a basic reporter if running in a testing or CI environment detected using unjs/std-env and a basic browser reporter.
You can create a new reporter object that implements { log(logObject): () => { } } interface.
Example: Simple JSON reporter
import { createConsola } from "consola";
const consola = createConsola({
reporters: [
{
log: (logObj) => {
console.log(JSON.stringify(logObj));
},
},
],
});
// Prints {"date":"2023-04-18T12:43:38.693Z","args":["foo bar"],"type":"log","level":2,"tag":""}
consola.log("foo bar");Log Level
Consola only shows logs with configured log level or below. (Default is 3)
Available log levels:
0: Fatal and Error1: Warnings2: Normal logs3: Informational logs, success, fail, ready, start, ...4: Debug logs5: Trace logs-999: Silent+999: Verbose logs
You can set the log level by either:
- Passing
leveloption tocreateConsola - Setting
consola.levelon instance - Using the
CONSOLA_LEVELenvironment variable (not supported for browser and core builds).
Log Types
Log types are exposed as consola.[type](...) and each is a preset of styles and log level.
A list of all available built-in types is available here.
Creating a new instance
Consola has a global instance and is recommended to use everywhere. In case more control is needed, create a new instance.
import { createConsola } from "consola";
const logger = createConsola({
// level: 4,
// fancy: true | false
// formatOptions: {
// columns: 80,
// colors: false,
// compact: false,
// date: false,
// },
});Integrations
With jest or vitest
describe("your-consola-mock-test", () => {
beforeAll(() => {
// Redirect std and console to consola too
// Calling this once is sufficient
consola.wrapAll();
});
beforeEach(() => {
// Re-mock consola before each test call to remove
// calls from before
// Jest
consola.mockTypes(() => jest.fn());
// Vitest
consola.mockTypes(() => vi.fn());
});
test("your test", async () => {
// Some code here
// Let's retrieve all messages of `consola.log`
// Get the mock and map all calls to their first argument
const consolaMessages = consola.log.mock.calls.map((c) => c[0]);
expect(consolaMessages).toContain("your message");
});
});With jsdom
{
new jsdom.VirtualConsole().sendTo(consola);
}Console Utils
// ESM
import {
stripAnsi,
centerAlign,
rightAlign,
leftAlign,
align,
box,
colors,
getColor,
colorize,
} from "consola/utils";
// CommonJS
const { stripAnsi } = require("consola/utils");Raw logging methods
Objects sent to the reporter could lead to unexpected output when object is close to internal object structure containing either message or args props. To enforce the object to be interpreted as pure object, you can use the raw method chained to any log type.
Example:
// Prints "hello"
consola.log({ message: "hello" });
// Prints "{ message: 'hello' }"
consola.log.raw({ message: "hello" });License
MIT