Registry / devops / rollup-plugin-by-output

rollup-plugin-by-output

library1.0.1jsnpmunverified

A Rollup plugin (or plugin helper) that allows applying Rollup plugins conditionally based on output options (format, file, etc.). Version 1.0.1 is the latest stable release. It helps reduce duplicate config when Rollup has multiple outputs that need different plugins (e.g., minification only for UMD builds). Key differentiator: provides elegant helpers like `when`, `whenAll`, `prop`, `format`, and `file` to filter plugins per output. Unlike manual array configs, it keeps code DRY. Requires Node >=8.3.0.

devops

npm install rollup-plugin-by-output

github ↗package ↗

INSTALL

IMPORT

SIG · ROLLUP-PLUGIN-BY-O

rollup-plugin-by-output

devopsjavascriptv1.0.1

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 18–223 runs

build_error

glibc

node 18–223 runs

build_error

Code

Verified usage

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

plugins

✓ import plugins from 'rollup-plugin-by-output'

✗ const plugins = require('rollup-plugin-by-output')

ESM default import; CJS require works but not recommended for Rollup configs

when

✓ import { when } from 'rollup-plugin-by-output'

✗ const { when } = require('rollup-plugin-by-output')

Named export; also available via CJS destructuring

file

✓ import { file } from 'rollup-plugin-by-output'

Named export; commonly used to filter by output file path

format

✓ import { format } from 'rollup-plugin-by-output'

Named export; commonly used to filter by output format (e.g., 'umd', 'cjs')

Applies babel to all outputs and terser only to the minified output.

import babel from 'rollup-plugin-babel'; import terser from 'rollup-plugin-terser'; import plugins, { file } from 'rollup-plugin-by-output'; export default { input: 'src/index.js', output: [ { file: 'dist/bundle.js', format: 'cjs' }, { file: 'dist/bundle.min.js', format: 'cjs' }, ], plugins: plugins( babel(), [file('dist/bundle.min.js'), terser()] ) };

Debug

Known issues

gotchaThe 'file' helper compares exact string equality, not a suffix. To match by file extension, use a custom function.

fix

Use when(file.name => name.endsWith('.min.js'), plugin) or prop('file', f => f.endsWith('.min.js'))

affects: all

deprecatedThe package exports using default export for 'plugins' but named exports for helpers – mixing can cause confusion.

fix

Be explicit: import plugins, { when } from 'rollup-plugin-by-output'

affects: all

Errors

Common errors & fixes

TypeError: plugins is not a function

Using default import as an array or passing incorrect arguments to 'plugins'.

fix

Call plugins() with arguments: plugins(pluginA, [filter, pluginB]). Do not wrap in array brackets.

when is not a function

Importing 'when' incorrectly (e.g., import { when } from 'rollup-plugin-by-output' but package doesn't export it as named in CJS).

fix

Ensure your bundler supports ESM or use import { when } from 'rollup-plugin-by-output' with ES modules; in CJS, use const { when } = require('rollup-plugin-by-output').

Module not found: Error: Can't resolve 'rollup-plugin-by-output'

Package not installed or missing in node_modules.

fix

Run npm install --save-dev rollup-plugin-by-output

Upgrade

Version history

1.0.1latest on npm

Audit

Dependencies

rolluprequiredpeer dependency - operates as a Rollup plugin

Agent activity

7 hits · last 30 days

node

Resources

githubhttps://github.com/wmzy/rollup-plugin-by-output ↗

packagehttps://www.npmjs.com/package/rollup-plugin-by-output ↗