rollup-plugin-flow-no-whitespace

1.0.0 verified Mon Apr 27 auth: no javascript

A Rollup plugin that removes Flow type annotations from JavaScript files without leaving extra whitespace. Current stable version 1.0.0. Useful for developers using Flow type checking who want to produce clean output after stripping types, avoiding double spaces or blank lines that other plugins may leave. Minimal and focused utility, likely with low release cadence.

Common errors

error Error: Cannot find module 'flow-remove-types' ↓

cause Missing required dependency flow-remove-types

fix

npm install flow-remove-types

error rollup-plugin-flow-no-whitespace is not a plugin ↓

cause Forgetting to call the exported function

fix

Use flowNoWhitespace() instead of just flowNoWhitespace

error Unexpected token (X:Y) in file with Flow type annotations ↓

cause Flow types not removed before other JS transformations

fix

Ensure flowNoWhitespace() plugin is included in the plugins array before other plugins that parse JavaScript

Warnings

gotcha Must use as a function call, not a reference ↓

fix Use flowNoWhitespace() with parentheses in the plugins array.

gotcha Only removes Flow type annotations, does not handle other transformations ↓

fix Consider using other plugins for additional transformation needs.

deprecated Flow is not as widely used as TypeScript, may not receive updates ↓

fix Consider migrating to TypeScript or using a more maintained plugin.

gotcha May not work with Rollup v3 or v4 without adjustments ↓

fix Check compatibility; plugin was likely built for Rollup v2.

breaking Whitespace removal behavior might differ from other type-stripping plugins ↓

fix Test output thoroughly to ensure whitespace is as expected.

Install

npm install rollup-plugin-flow-no-whitespace

yarn add rollup-plugin-flow-no-whitespace

pnpm add rollup-plugin-flow-no-whitespace

Imports

default

wrong

const flowNoWhitespace = require('rollup-plugin-flow-no-whitespace')

correct

import flowNoWhitespace from 'rollup-plugin-flow-no-whitespace'

ESM default import; CommonJS require works but not recommended.

flowNoWhitespace

wrong

import { flowNoWhitespace } from 'rollup-plugin-flow-no-whitespace'

correct

import flowNoWhitespace from 'rollup-plugin-flow-no-whitespace'

Named import does not exist; use default import.

plugin usage

wrong

export default { plugins: [flowNoWhitespace] }

correct

export default { plugins: [flowNoWhitespace()] }

Must call the default export as a function to instantiate the plugin.

Quickstart

Shows how to import and use the plugin in a Rollup configuration to remove Flow types without whitespace artifacts.

import flowNoWhitespace from 'rollup-plugin-flow-no-whitespace';

export default {
  input: 'src/index.js',
  output: { file: 'dist/bundle.js', format: 'cjs' },
  plugins: [flowNoWhitespace()]
};