Registry / testing / eslint-plugin-flow

eslint-plugin-flow

library2.29.1jsnpmunverified

This package (eslint-plugin-flow) is a legacy alias for eslint-plugin-flowtype, which provides Flowtype linting rules for ESLint. The current stable version of eslint-plugin-flowtype is 8.0.3 (October 2021). The package enforces Flow type annotations with over 30 rules, including type-id-match, no-weak-types, and sort-type-union-intersection-members. It is designed for projects using Flow with ESLint 8+. Key differentiators: it is the most mature Flow linting plugin, supports ESLint 8, and is maintained by the community. However, note that this alias package is deprecated and should be replaced with eslint-plugin-flowtype directly.

testing

npm install eslint-plugin-flow

github ↗package ↗

INSTALL

IMPORT

SIG · ESLINT-PLUGIN-FLOW

eslint-plugin-flow

testingjavascriptv2.29.1

Install

—

Import

—

Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

plugin as default

✓ import plugin from 'eslint-plugin-flowtype'

✗ const plugin = require('eslint-plugin-flow')

The 'eslint-plugin-flow' package is deprecated; use 'eslint-plugin-flowtype' instead. ESM import works in ESLint 8+.

rules

✓ import { rules } from 'eslint-plugin-flowtype'

✗ const { rules } = require('eslint-plugin-flow')

Accessing rules from the deprecated alias may still work but is not recommended.

configs

✓ import { configs } from 'eslint-plugin-flowtype'

Configs are recommended. Not available in the deprecated alias.

This shows how to configure ESLint with the flowtype plugin using recommended config and custom rules. Avoid the deprecated eslint-plugin-flow package.

// .eslintrc.js module.exports = { plugins: ['flowtype'], extends: ['plugin:flowtype/recommended'], rules: { 'flowtype/boolean-style': [2, 'boolean'], 'flowtype/no-weak-types': 2, }, }; // Install: // npm install --save-dev eslint eslint-plugin-flowtype // Do not use eslint-plugin-flow (deprecated).

Debug

Known issues

breakingeslint-plugin-flowtype v8 drops support for ESLint 7. Requires ESLint 8+.

fix

Upgrade ESLint to version 8 or later, or use eslint-plugin-flowtype@^7 if you must stay on ESLint 7.

affects: >=8.0.0

breakingeslint-plugin-flowtype v7 drops Node.js 10 support.

fix

Use Node.js 12 or later.

affects: >=7.0.0

deprecatedeslint-plugin-flow is deprecated. Use eslint-plugin-flowtype instead.

fix

Replace 'eslint-plugin-flow' with 'eslint-plugin-flowtype' in your package.json and update all imports/requires.

affects: all

gotchaThe plugin's default export is the plugin object, not a function. You cannot use it with ESLint's 'plugin' key incorrectly.

fix

In .eslintrc, use: plugins: ['flowtype'] and rules: { 'flowtype/no-weak-types': 2 }.

affects: >=2.0.0

gotchaSome rules require specific Flow version schemas; not all rules work with older Flow versions.

fix

Ensure your Flow version is compatible with the rule semantics (e.g., sort-type-union-intersection-members requires Flow 0.155+).

affects: >=2.0.0

Errors

Common errors & fixes

Cannot find module 'eslint-plugin-flow'

The package is deprecated and may not be published to npm under that name.

fix

npm install --save-dev eslint-plugin-flowtype and replace all references.

Error: ESLint configuration in .eslintrc is invalid: Environment key "eslint-plugin-flowtype/rules" is not valid.

Using the deprecated alias to try to access rules.

fix

Use valid rule names like 'flowtype/no-weak-types' in rules.

TypeError: plugin is not a function

Attempting to call the default export as a function (e.g., plugin()).

fix

The default export is an object, not a function. Use it as part of ESLint's plugin system.

Upgrade

Version history

2.29.1latest on npm

Audit

Dependencies

eslintrequiredpeer dependency, ESLint 2.0+ compatible, but v8 requires ESLint 8

Agent activity

12 hits · last 30 days

node

Resources

githubhttps://github.com/gajus/eslint-plugin-flowtype ↗

packagehttps://www.npmjs.com/package/eslint-plugin-flow ↗