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Functional errors with formatted output.
This package adds printf-like interpolation to errors.
This package useful when you frequently display parameters in error messages and manual string concatenation is becoming verbose.
This package is ESM only. In Node.js (version 12.20+, 14.14+, or 16.0+), install with npm:
npm install fault
In Deno with Skypack:
import {fault} from 'https://cdn.skypack.dev/fault@2?dts'
In browsers with Skypack:
<script type="module">
import {fault} from 'https://cdn.skypack.dev/fault@2?min'
</script>
import {fault} from 'fault'
throw fault('Hello %s!', 'Eric')
Yields:
Error: Hello Eric!
at FormattedError (~/node_modules/fault/index.js:30:12)
at Object.<anonymous> (~/example.js:3:7)
…
Or, format a float in a type error:
import {fault} from 'fault'
throw fault.type('Who doesn’t like %f? 🍰', Math.PI)
Yields:
TypeError: Who doesn’t like 3.141593? 🍰
at Function.FormattedError [as type] (~/node_modules/fault/index.js:30:12)
at Object.<anonymous> (~/example.js:3:7)
This package exports the following identifiers: fault
and create
.
There is no default export.
fault(format?[, values…])
Create an error with a printf-like formatted message.
format
(string
, optional)
— template stringvalues
(*
, optional)
— values to render in format
An Error
instance.
The following formatters are supported in format
:
%s
— string%b
— binary%c
— character%d
— decimal%f
— floating point%o
— octal%x
— lowercase hexadecimal%X
— uppercase hexadecimal%
followed by any other character, prints that characterSee samsonjs/format
for argument parsing.
fault.eval(format?[, values…])
— EvalErrorfault.range(format?[, values…])
— RangeErrorfault.reference(format?[, values…])
— ReferenceErrorfault.syntax(format?[, values…])
— SyntaxErrorfault.type(format?[, values…])
— TypeErrorfault.uri(format?[, values…])
— URIErrorcreate(Constructor)
Factory to create instances of ErrorConstructor
with support for formatting.
Used internally to wrap the global error constructors and exposed for custom
errors.
Returns a function just like fault
.
This package is fully typed with TypeScript. There are no extra exported types.
This package is at least compatible with all maintained versions of Node.js. As of now, that is Node.js 12.20+, 14.14+, and 16.0+. It also works in Deno and modern browsers.
This package is safe.
wooorm/bail
— throw if given an errorYes please! See How to Contribute to Open Source.
FAQs
Functional errors with formatted output
The npm package fault receives a total of 2,934,416 weekly downloads. As such, fault popularity was classified as popular.
We found that fault demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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