Skip to documentation
ALEXANDRONET

package

@stackline/vfile-reporter-json 1.0.2 — installation and API

vfile utility to create a JSON report for a file

Install @stackline/vfile-reporter-json

npm install @stackline/[email protected]

Package version: 1.0.2. Metadata verified: 2026-11-12. This is separate from the framework version and demonstration runtime.

Node.js requirement
{}
Accepted peer dependencies (declared ranges)
{}

Tested environments are described in the versioned README and linked source checks. A declared peer range is not evidence that every version in it was tested.

Versioned reference

This reference comes from the published @stackline/[email protected] README. Its upstream attribution and license remain with the source. Benchmark and security statements describe the cited tests and advisories, not a guarantee for every application.

@stackline/vfile-reporter-json

vfile utility to create a JSON report for a file.

Documentation | npm | Issues | Repository

Current package version: 1.0.2

Why this package?

@stackline/vfile-reporter-json is the Stackline-maintained distribution of [email protected]. It is an independent continuation of vfile-reporter-json; original authors and licenses remain credited below.

Compatibility

Item Value
Package @stackline/[email protected]
API target [email protected]
Supported Node.js See supported framework requirements
License MIT
Module type module
Main entry index.js
Types index.d.ts
Runtime dependencies vfile, vfile-message

Installation

npm install @stackline/vfile-reporter-json

Preserve existing imports and plugin resolution with an npm alias:

npm install vfile-reporter-json@npm:@stackline/vfile-reporter-json

Usage and API reference

vfile-reporter-json

vfile utility to create a report in machine readable JSON.

Contents

What is this?

This package is like vfile-reporter but it outputs machine readable JSON.

When should I use this?

You can use this when you need to serialize lint results for machines, use vfile-reporter itself for humans.

Install

This package is ESM only. In Node.js (version 14.14+ and 16.0+), install with npm:

npm install @stackline/vfile-reporter-json

In Deno with esm.sh:

import {reporterJson} from 'https://esm.sh/vfile-reporter-json@3'

In browsers with esm.sh:

<script type="module">
  import {reporterJson} from 'https://esm.sh/vfile-reporter-json@3?bundle'
</script>

Use

import {VFile} from 'vfile'
import {reporterJson} from '@stackline/vfile-reporter-json'

const one = new VFile({path: 'test/fixture/1.js'})
const two = new VFile({path: 'test/fixture/2.js'})

one.message('Warning!', {line: 2, column: 4})

console.log(reporterJson([one, two]))

Yields:

[{"path":"test/fixture/1.js","cwd":"/Users/tilde/projects/oss/vfile-reporter-json","history":["test/fixture/1.js"],"messages":[{"reason":"Warning!","line":2,"column":4,"position":{"start":{"line":2,"column":4},"end":{"line":null,"column":null}},"ruleId":null,"source":null,"fatal":false,"stack":null}]},{"path":"test/fixture/2.js","cwd":"/Users/tilde/projects/oss/vfile-reporter-json","history":["test/fixture/2.js"],"messages":[]}]

API

This package exports the identifier reporterJson. That identifier is also the default export.

reporterJson(files[, options])

Create a serialized JSON report from one file or multiple files.

Parameters
  • files (VFile or Array<VFile>) — file or files to report
  • options (Options, optional) — configuration
Returns

Report as serialized JSON (string).

Reporters must return strings, which is why serialized JSON is exposed. You can parse the result with JSON.parse, in which case you will get Array<JsonFile>.

JsonFile

JSON file (TypeScript type).

Fields
  • path (string) — full path (example: '~/index.min.js')
  • cwd (string) — base of path
  • history (Array<string>) — list of filepaths the file moved between; the first is the original path and the last is the current path
  • messages (Array<JsonMessage>) — list of filepaths the file moved between; the first is the original path and the last is the current path

JsonMessage

JSON message (TypeScript type).

Fields
  • stack (string | null) — stack of message; this is used by normal errors to show where something happened in programming code
  • reason (string) — reason for message; you should use markdown
  • fatal (boolean | null | undefined) — state of problem; true marks associated file as no longer processable (error); false necessitates a (potential) change (warning); null | undefined for things that might not need changing (info)
  • line (number | null) — starting line of error
  • column (number | null) — starting column of error
  • position (Position | null) — full unist position
  • source (string | null) — namespace of message (example: 'my-package')
  • ruleId (string | null) — category of message (example: 'my-rule')
  • actual (string | null | undefined) — specify the source value that’s being reported, which is deemed incorrect
  • expected (Array<string> | null | undefined) — suggest acceptable values that can be used instead of actual
  • url (string | null | undefined) — link to docs for the message; this must be an absolute URL that can be passed as x to new URL(x)
  • note (string | null | undefined) — long form description of the message (should use markdown)

Options

Configuration (TypeScript type).

Fields
  • pretty (number | string | boolean, default: 0) — value of space of JSON.stringify(x, undefined, space)
  • quiet (boolean, default: false) — do not show files without messages
  • silent (boolean, default: false) — show errors only; this does not show info and warning messages; also sets quiet to true

Types

This package is fully typed with TypeScript. It exports the additional types JsonFile, JsonMessage, and Options.

Compatibility

Projects maintained by the unified collective are compatible with all maintained versions of Node.js. As of now, that is Node.js 14.14+ and 16.0+. Our projects sometimes work with older versions, but this is not guaranteed.

Contribute

See contributing.md in vfile/.github for ways to get started. See support.md for ways to get help.

This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.

License

MIT © Titus Wormer

Credits and original authors

Original copyright, license notices and contributor acknowledgements remain part of this distribution. Stackline maintenance does not replace authorship of the original work.

Use this repository's issue tracker for reproducible bugs and feature requests. Join r/Stackline for examples, usage questions and release discussions.