Registry / testing / rollup-plugin-ephemeral

rollup-plugin-ephemeral

library0.0.1jsnpmunverified

A Rollup plugin for creating virtual modules that behave like real files, useful for testing or generating modules on-the-fly. Version 0.0.1 is the initial unstable release. Different from @rollup/plugin-virtual in that ephemeral modules are treated as real file modules by Rollup, affecting resolution and caching behavior. This package ships TypeScript types and supports ESM only.

testing devops

npm install rollup-plugin-ephemeral

package ↗

INSTALL

IMPORT

SIG · ROLLUP-PLUGIN-EPHE

rollup-plugin-ephemeral

testingjavascriptv0.0.1

Install

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Import

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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.

ephemeral

✓ import ephemeral from 'rollup-plugin-ephemeral'

✗ const ephemeral = require('rollup-plugin-ephemeral')

This package is ESM-only; CommonJS require() will fail.

ephemeral (named export)

✓ import { ephemeral } from 'rollup-plugin-ephemeral'

✗ import { default as ephem } from 'rollup-plugin-ephemeral'

The package only exports a default function; named import is not available.

ephemeral (type import)

✓ import type { RollupPluginEphemeralOptions } from 'rollup-plugin-ephemeral'

✗ import { RollupPluginEphemeralOptions } from 'rollup-plugin-ephemeral'

Types are only available as type-only imports to avoid runtime side effects.

Shows basic usage: create a virtual module entry.js that exports a constant, then bundle with Rollup and output the generated code.

import ephemeral from 'rollup-plugin-ephemeral'; import { rollup } from 'rollup'; const bundle = await rollup({ input: 'entry.js', plugins: [ ephemeral('entry.js', 'export const answer = 42;'), ], }); const { output } = await bundle.generate({ format: 'es' }); console.log(output[0].code);

Debug

Known issues

breakingESM-only: rollup-plugin-ephemeral uses native ES modules. Using require() will throw MODULE_NOT_FOUND.

fix

Use import syntax and ensure your project is configured for ESM (e.g., type: module in package.json).

affects: >=0.0.1

gotchaVirtual modules created by this plugin are treated as real files by Rollup's resolveId hook, which may affect caching and watch mode behavior differently than @rollup/plugin-virtual.

fix

If you need standard virtual module behavior, use @rollup/plugin-virtual instead.

affects: >=0.0.1

gotchaThe plugin does not support side effects via a separate options object; all arguments are positional. Pass only id and code.

fix

Call ephemeral('id', 'code') with exactly two string arguments.

affects: >=0.0.1

Errors

Common errors & fixes

Error [ERR_REQUIRE_ESM]: require() of ES Module /path/to/rollup-plugin-ephemeral/index.js not supported.

The package is ESM-only, but the project is using CommonJS require() to load the plugin.

fix

Switch to dynamic import: const ephemeral = await import('rollup-plugin-ephemeral'); or configure your project as ESM.

TypeError: ephemeral is not a function

Importing the default export incorrectly, e.g., using named import where only default export exists.

fix

Use: import ephemeral from 'rollup-plugin-ephemeral'; Do not use named import: import { ephemeral } from 'rollup-plugin-ephemeral';

Upgrade

Version history

0.0.1latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

9 hits · last 30 days

node

Resources

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