ghostscript

@privyid/ghostscript

Ghostscript compiled to WebAssembly

Note

This is low-level WebAssembly library which part of @privyid/ghoulscript. This use GS version 10.07.1

Installation

yarn add @privyid/ghostscript

How to Use

import Module from '@privyid/ghostscript'

const mod     = await Module()
const working = '/working'

mod.FS.mkdir(working)
mod.FS.mount(mod.NODEFS, { root: __dirname }, working)
mod.FS.chdir(working)

await mod.callMain([
  '-q',
  '-dSAFER',
  '-dBATCH',
  '-dNOPAUSE',
  '-sDEVICE=png16m',
  '-dGraphicsAlphaBits=4',
  '-sOutputFile=out/sammple.png',
  'sample.pdf',
])

Development

• Clone this repo
• Install Emcripten SDK
• Run yarn build
• Run yarn test

Building from source

The Ghostscript WASM build requires the Emscripten SDK and runs inside a container to keep your host clean.

Prerequisites

• Docker with BuildKit enabled (DOCKER_BUILDKIT=1)

• Git submodule initialised:

  git submodule update --init packages/ghostscript/ghostpdl

Docker build

Builds into dist/:

DOCKER_BUILDKIT=1 docker build \
  --target builder \
  -f Dockerfile \
  . \
  --output dist/

Or build to a tarball first, then extract:

DOCKER_BUILDKIT=1 docker build \
  --target builder \
  -f Dockerfile \
  . \
  -o /tmp/ghostscript-wasm-build.tar

tar -xf /tmp/ghostscript-wasm-build.tar -C packages/ghostscript/

The build clones EMSDK 6.0.6 inside the container and runs the same ./build.sh script that CI uses. Full compilation typically takes 10–30 minutes depending on CPU cores.

Local build (alternative)

If you already have EMSDK 6.0.6 installed:

source /opt/emsdk/emsdk_env.sh   # or your emsdk activation path
yarn build

Special Thank ❤️

@jsscheller - for build script.

License

AGPL-3.0