assertion-error-formatter

Node Assertion Error Formatter

Format errors to display a diff between the actual and expected

Originally extracted from mocha

Usage

import {format} from 'assertion-error-formatter'
 
format(error)

API Reference

format(error [, options])

• error: a javascript error
• options: An object with the following keys:
  • colorFns: An object with the keys 'diffAdded', 'diffRemoved', 'errorMessage', 'errorStack'. The values are functions to colorize a string, each defaults to identity.
  • inlineDiff: boolean (default: false)
    • toggle between inline and unified diffs