Registry / devops / rollup-swc-preserve-directives

rollup-swc-preserve-directives

library0.7.0jsnpmunverified

Rollup plugin that uses SWC to preserve directives such as shebang and string directives (e.g., 'use strict', 'use asm') in bundled output. Version 0.7.0 is the latest stable; updated on demand. It integrates with Rollup build pipeline to ensure important code-level annotations are not stripped during minification or transformation, unlike naive bundlers. Differentiates itself by being SWC-based (fast, Rust-powered) and designed specifically for directive preservation.

devops

npm install rollup-swc-preserve-directives

package ↗

INSTALL

IMPORT

SIG · ROLLUP-SWC-PRESERV

rollup-swc-preserve-directives

devopsjavascriptv0.7.0

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.

default

✓ import swcPreserveDirectives from 'rollup-swc-preserve-directives'

✗ const swcPreserveDirectives = require('rollup-swc-preserve-directives')

ESM default export; CJS require() works but not recommended for consistency.

swcPreserveDirectives

✓ import swcPreserveDirectives from 'rollup-swc-preserve-directives'

✗ import { swcPreserveDirectives } from 'rollup-swc-preserve-directives'

Avoid named import; only default export is provided.

type definitions

✓ import type { RollupSwcPreserveDirectivesOptions } from 'rollup-swc-preserve-directives'

Types are shipped but not exported directly; use module augmentation if needed.

Demonstrates basic usage of rollup-swc-preserve-directives plugin in a Rollup config to preserve directives during bundling.

import swcPreserveDirectives from 'rollup-swc-preserve-directives'; import { defineConfig } from 'rollup'; export default defineConfig({ input: 'src/index.js', output: { dir: 'dist', format: 'esm' }, plugins: [ swcPreserveDirectives() ] });

Debug

Known issues

breakingSWC version mismatch can cause parse errors or unexpected behavior.

fix

Use @swc/core version compatible with the SWC version used by this plugin; check package.json peerDependencies.

affects: >=0.7.0

deprecatedRollup <4 support may be dropped in future versions.

fix

Upgrade Rollup to ^4.0.0 if encountering issues, or pin to older plugin version.

affects: >=0.6.0

gotchaPlugin only works with Rollup's JavaScript plugins; if using TypeScript, ensure SWC is configured separately for type stripping.

fix

Use @rollup/plugin-typescript or @rollup/plugin-sucrase for TS before this plugin.

affects: >=0.0.0

Errors

Common errors & fixes

Error: Cannot find module '@swc/core'

@swc/core is not installed or not in node_modules.

fix

Run `npm install @swc/core` in your project directory.

TypeError: swcPreserveDirectives is not a function

Using named import instead of default import.

fix

Use `import swcPreserveDirectives from 'rollup-swc-preserve-directives'` (no curly braces).

Upgrade

Version history

0.7.0latest on npm

Audit

Dependencies

rolluprequiredPeer dependency: requires Rollup >=2 || >=3 || >=4 to function as a plugin.

@swc/corerequiredRuntime dependency: uses SWC to parse and transform code for directive preservation.

Agent activity

6 hits · last 30 days

node

Resources

packagehttps://www.npmjs.com/package/rollup-swc-preserve-directives ↗