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ParzivalTD 06661525f8 Deploy: TekDek Command Center (2026-04-13)

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Documentation: DEPLOYMENT-POSTMORTEM-2026-04-13.md

2026-04-13 12:50:40 -04:00

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makeerror

A library to make errors.

Basics

Makes an Error constructor function with the signature below. All arguments are optional, and if the first argument is not a String, it will be assumed to be data:

function(message, data)

You'll typically do something like:

var makeError = require('makeerror')
var UnknownFileTypeError = makeError(
  'UnknownFileTypeError',
  'The specified type is not known.'
)
var er = UnknownFileTypeError()

er will have a prototype chain that ensures:

er instanceof UnknownFileTypeError
er instanceof Error

Templatized Error Messages

There is support for simple string substitutions like:

var makeError = require('makeerror')
var UnknownFileTypeError = makeError(
  'UnknownFileTypeError',
  'The specified type "{type}" is not known.'
)
var er = UnknownFileTypeError({ type: 'bmp' })

Now er.message or er.toString() will return 'The specified type "bmp" is not known.'.

Prototype Hierarchies

You can create simple hierarchies as well using the prototype chain:

var makeError = require('makeerror')
var ParentError = makeError('ParentError')
var ChildError = makeError(
  'ChildError',
  'The child error.',
  { proto: ParentError() }
)
var er = ChildError()