List transitive dynamic library dependencies on macOS

find-deps.js

#!/usr/bin/env node
const child_process = require('child_process')
const printTree = require('print-tree')

const depsOf = (lib) => {
  const res = child_process.spawnSync('otool', ['-L', lib])
  if (res.status !== 0) {
    throw new Error(`Failed to run otool on ${lib}:\n${res.stderr}`)
  }
  return res.stdout.toString()
    .split('\n')
    .slice(2) // the first 2 lines of `otool` are the library itself
    .map(x => x.substr(1).split(' ', 2)[0])
    .filter(l => l.startsWith('/')) // filter out @rpath, since we don't know how to resolve them
}

const root = process.argv[2]
printTree(
  {lib: root, seen: new Set},
  node => node.lib,
  node => {
    const deps = depsOf(node.lib).filter(x => !node.seen.has(x))
    const seen = new Set([...deps, ...node.seen])
    return deps.map(lib => ({lib, seen}))
  }
)

z example output

$ ./find-deps.js `which ls`
/bin/ls
├── /usr/lib/libncurses.5.4.dylib
└─┬ /usr/lib/libSystem.B.dylib
  ├── /usr/lib/system/libcache.dylib
  ├── /usr/lib/system/libcommonCrypto.dylib
  ├── /usr/lib/system/libcompiler_rt.dylib
  ├── /usr/lib/system/libcopyfile.dylib
  ├── /usr/lib/system/libcorecrypto.dylib
  ├─┬ /usr/lib/system/libdispatch.dylib
  │ └─┬ /usr/lib/libobjc.A.dylib
  │   ├── /usr/lib/libc++abi.dylib
  │   └── /usr/lib/libc++.1.dylib
  ├─┬ /usr/lib/system/libdyld.dylib
  │ └─┬ /usr/lib/closure/libclosured.dylib
  │   └─┬ /usr/lib/libc++.1.dylib
  │     └── /usr/lib/libc++abi.dylib
  ├── /usr/lib/system/libkeymgr.dylib
  ├── /usr/lib/system/liblaunch.dylib
  ├── /usr/lib/system/libmacho.dylib
  ├── /usr/lib/system/libquarantine.dylib
  ├── /usr/lib/system/libremovefile.dylib
  ├── /usr/lib/system/libsystem_asl.dylib
  ├── /usr/lib/system/libsystem_blocks.dylib
  ├── /usr/lib/system/libsystem_c.dylib
  ├── /usr/lib/system/libsystem_configuration.dylib
  ├── /usr/lib/system/libsystem_coreservices.dylib
  ├── /usr/lib/system/libsystem_darwin.dylib
  ├── /usr/lib/system/libsystem_dnssd.dylib
  ├── /usr/lib/system/libsystem_info.dylib
  ├── /usr/lib/system/libsystem_m.dylib
  ├── /usr/lib/system/libsystem_malloc.dylib
  ├─┬ /usr/lib/system/libsystem_network.dylib
  │ └─┬ /usr/lib/libobjc.A.dylib
  │   ├── /usr/lib/libc++abi.dylib
  │   └── /usr/lib/libc++.1.dylib
  ├── /usr/lib/system/libsystem_networkextension.dylib
  ├── /usr/lib/system/libsystem_notify.dylib
  ├── /usr/lib/system/libsystem_sandbox.dylib
  ├── /usr/lib/system/libsystem_secinit.dylib
  ├── /usr/lib/system/libsystem_kernel.dylib
  ├── /usr/lib/system/libsystem_platform.dylib
  ├── /usr/lib/system/libsystem_pthread.dylib
  ├─┬ /usr/lib/system/libsystem_symptoms.dylib
  │ └─┬ /usr/lib/libobjc.A.dylib
  │   ├── /usr/lib/libc++abi.dylib
  │   └── /usr/lib/libc++.1.dylib
  ├─┬ /usr/lib/system/libsystem_trace.dylib
  │ └─┬ /usr/lib/libobjc.A.dylib
  │   ├── /usr/lib/libc++abi.dylib
  │   └── /usr/lib/libc++.1.dylib
  ├── /usr/lib/system/libunwind.dylib
  └─┬ /usr/lib/system/libxpc.dylib
    └─┬ /usr/lib/libobjc.A.dylib
      ├── /usr/lib/libc++abi.dylib
      └── /usr/lib/libc++.1.dylib