Registry / testing / eslint-plugin-ft-flow

eslint-plugin-ft-flow

library3.0.11jsnpmunverified

ESLint plugin providing Flowtype linting rules, maintained by the flow-typed community as a fork of the original eslint-plugin-flowtype. Current version 3.0.11, with regular releases every few months. Unlike the original plugin, it is actively maintained, supports ESLint 9 flat config, and includes additional rules like `no-duplicate-type-union-intersection-members` and `sort-type-union-intersection-members`. Requires `eslint` ^8.56.0 or ^9.0.0 and optionally `hermes-eslint` >=0.15.0.

testing

npm install eslint-plugin-ft-flow

github ↗package ↗

INSTALL

IMPORT

SIG · ESLINT-PLUGIN-FT-F

eslint-plugin-ft-flow

testingjavascriptv3.0.11

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 (default)

✓ import plugin from 'eslint-plugin-ft-flow'

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

ESM-only since v3; CommonJS require not supported.

configs

✓ import { configs } from 'eslint-plugin-ft-flow'

✗ const configs = require('eslint-plugin-ft-flow').configs

Use named import for configs (e.g., recommended).

rules

✓ import { rules } from 'eslint-plugin-ft-flow'

✗ const rules = require('eslint-plugin-ft-flow').rules

Access rule definitions via named import.

Show how to set up eslint-plugin-ft-flow with ESLint flat config, enabling a few rules for Flowtype linting.

// eslint.config.js (flat config, ESLint 9) import plugin from 'eslint-plugin-ft-flow'; export default [ { files: ['**/*.js', '**/*.jsx'], plugins: { 'ft-flow': plugin, }, rules: { 'ft-flow/define-flow-type': 1, 'ft-flow/use-flow-type': 1, 'ft-flow/no-weak-types': 2, }, }, ];

Debug

Known issues

breakingVersion 3.0.10 deprecated CommonJS require; only ESM imports work.

fix

Use import statement instead of require().

affects: >=3.0.10

deprecatedSome rules may be deprecated and replaced; check documentation.

fix

Use the recommended rule set and migrate deprecated rules.

affects: >=3.0.0

gotchaRule 'define-flow-type' may conflict with ESLint's 'no-unused-vars'.

fix

Add 'no-unused-vars': 'off' or configure appropriately.

gotchaPeer dependency hermes-eslint is optional but if used must be >=0.15.0.

fix

Install hermes-eslint@^0.15.0 if you need Hermes parsing.

affects: >=3.0.0

gotchaFlat config (ESLint 9) is supported but not all legacy config formats.

fix

Use eslint.config.js flat config; for .eslintrc use version <3.0.0.

affects: >=3.0.0

Errors

Common errors & fixes

Error: Plugin 'ft-flow' was conflicted between '.eslintrc.js' and 'eslint.config.js'

Mixing legacy and flat configs.

fix

Use only one config format; remove .eslintrc.* if using eslint.config.js.

TypeError: Cannot destructure property 'getSourceCode' of 'context' as it is undefined.

Using an incompatible version of ESLint or outdated plugin version.

fix

Update eslint to ^8.56.0 or ^9.0.0 and eslint-plugin-ft-flow to >=3.0.10.

Error: Cannot find module 'eslint-plugin-ft-flow'

Module not installed or not resolved.

fix

Run npm install eslint-plugin-ft-flow --save-dev

Parsing error: The keyword 'import' is reserved

ESLint is not configured for ES modules.

fix

Set 'sourceType': 'module' in ESLint config or use .mjs extension.

Upgrade

Version history

3.0.11latest on npm

Audit

Dependencies

eslintrequiredpeer dependency: required for plugin to work

hermes-eslintoptionaloptional peer dependency for Hermes parser support

Agent activity

2 hits · last 30 days

node

Resources

githubhttps://github.com/flow-typed/eslint-plugin-ft-flow ↗

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