show-invisibles

Converts invisible characters to a commonly recognizable visible form.

Install

npm install show-invisibles

yarn add show-invisibles

pnpm add show-invisibles

Usage

import { showInvisibles } from 'show-invisibles'

const input = `1 2\n3\t4\r5`

console.log(showInvisibles(input))

// => 1·2⏎3↹4␍5

API

showInvisibles

• Type: (input: string, options?: Options) => string

Converts invisible characters to a commonly recognizable visible form.

Interface

export interface Options {
  /**
   * transform mappings
   *
   * @see {@link DEFAULT_MAPPINGS}
   */
  mappings?: Map<string, string>
}

Built-in mappings

export const DEFAULT_MAPPINGS: Required<Options>['mappings'] = new Map([
  // Middle Dot, \u00B7
  [' ', '·'],
  // Return Symbol, \u23ce
  ['\n', '⏎'],
  // Left Arrow To Bar Over Right Arrow To Bar, \u21b9
  ['\r', '␍'],
  // Carriage Return Symbol, \u240D
  ['\t', '↹'],
])

Credits

• Extracted from prettier/prettier-linter-helpers with a little change. Published as ESM with TypeScript support.

License

MIT License © 2025-PRESENT ntnyq