npm exposed environment variables

// per https://docs.npmjs.com/misc/scripts, npm exposes a bunch of variables to
// the environment prefixed with npm_config_*, npm_package_* and npm_lifecycle_*.
// Here's a list of all variables exposed in my setup.

npm_config_access=
npm_config_allow_same_version=
npm_config_also=
npm_config_always_auth=
npm_config_argv='{"remain":[],"cooked":["run","foo"],"original":["run","foo"]}'
npm_config_auth_type=legacy
npm_config_bin_links=true
npm_config_browser=
npm_config_ca=
npm_config_cache=/Users/moos/.npm
npm_config_cache_lock_retries=10
npm_config_cache_lock_stale=60000
npm_config_cache_lock_wait=10000
npm_config_cache_max=Infinity
npm_config_cache_min=10
npm_config_cafile=
npm_config_cert=
npm_config_cidr=
npm_config_color=true
npm_config_commit_hooks=true
npm_config_depth=Infinity
npm_config_description=true
npm_config_dev=
npm_config_dry_run=
npm_config_editor=vi
npm_config_email=moos@example.com
npm_config_engine_strict=
npm_config_fetch_retries=2
npm_config_fetch_retry_factor=10
npm_config_fetch_retry_maxtimeout=60000
npm_config_fetch_retry_mintimeout=10000
npm_config_force=
npm_config_git=git
npm_config_git_tag_version=true
npm_config_global=
npm_config_global_style=
npm_config_globalconfig=/Users/moos/dev/homebrew/etc/npmrc
npm_config_globalignorefile=/Users/moos/dev/homebrew/etc/npmignore
npm_config_group=20
npm_config_ham_it_up=
npm_config_heading=npm
npm_config_https_proxy=
npm_config_if_present=
npm_config_ignore_prepublish=
npm_config_ignore_scripts=
npm_config_init_author_email=
npm_config_init_author_name=
npm_config_init_author_url=
npm_config_init_license=ISC
npm_config_init_module=/Users/moos/.npm-init.js
npm_config_init_version=1.0.0
npm_config_json=
npm_config_key=
npm_config_legacy_bundling=
npm_config_link=
npm_config_local_address=
npm_config_loglevel=notice
npm_config_logs_max=10
npm_config_long=
npm_config_maxsockets=50
npm_config_message=%s
npm_config_metrics_registry=
npm_config_node_version=8.6.0
npm_config_offline=
npm_config_onload_script=
npm_config_only=
npm_config_optional=true
npm_config_otp=
npm_config_package_lock=true
npm_config_parseable=
npm_config_prefer_offline=
npm_config_prefer_online=
npm_config_prefix=/Users/moos/dev/homebrew
npm_config_production=
npm_config_progress=true
npm_config_proxy=
npm_config_read_only=
npm_config_rebuild_bundle=true
npm_config_registry=
npm_config_rollback=true
npm_config_save=true
npm_config_save_bundle=
npm_config_save_dev=
npm_config_save_exact=
npm_config_save_optional=
npm_config_save_prefix='^'
npm_config_save_prod=
npm_config_scope=
npm_config_script_shell=
npm_config_scripts_prepend_node_path=warn-only
npm_config_searchexclude=
npm_config_searchlimit=20
npm_config_searchopts=
npm_config_searchstaleness=900
npm_config_send_metrics=
npm_config_shell=/bin/bash
npm_config_shrinkwrap=true
npm_config_sign_git_tag=
npm_config_sso_poll_frequency=500
npm_config_sso_type=oauth
npm_config_strict_ssl=true
npm_config_tag=latest
npm_config_tag_version_prefix=v
npm_config_timing=
npm_config_tmp=/var/folders/jl/zr54cdxs08l1djw8s4ws2t540000gn/T
npm_config_umask=0022
npm_config_unicode=true
npm_config_unsafe_perm=true
npm_config_usage=
npm_config_user=501
npm_config_user_agent='npm/5.5.1 node/v8.6.0 darwin x64'
npm_config_userconfig=/Users/moos/.npmrc
npm_config_version=
npm_config_versions=
npm_config_viewer=man
npm_execpath=/Users/moos/dev/homebrew/lib/node_modules/npm/bin/npm-cli.js
npm_lifecycle_event=foo
npm_lifecycle_script='set | grep '\''npm_'\'' '
npm_node_execpath=/Users/moos/dev/homebrew/Cellar/node/8.6.0/bin/node
npm_package_dependencies_custom_react_scripts='^0.2.1'
npm_package_dependencies_date_fns='^2.0.0-alpha.7'
npm_package_dependencies_i18next='^10.0.3'
npm_package_dependencies_i18next_xhr_backend='^1.4.3'
npm_package_dependencies_mobx='^3.3.1'
npm_package_dependencies_mobx_react='^4.3.3'
npm_package_dependencies_react='^16.0.0'
npm_package_dependencies_react_dom='^16.0.0'
npm_package_dependencies_react_i18next='^6.0.6'
npm_package_dependencies_react_intl_universal='^1.4.3'
npm_package_dependencies_react_router_dom='^4.2.2'
npm_package_dependencies_styled_components='^2.2.1'
npm_package_description='Foo App'
npm_package_devDependencies_enzyme='^3.1.0'
npm_package_devDependencies_enzyme_adapter_react_16='^1.0.2'
npm_package_devDependencies_jest_enzyme='^4.0.1'
npm_package_devDependencies_mobx_react_devtools='^4.2.15'
npm_package_devDependencies_react_test_renderer='^16.0.0'
npm_package_files_0='build/*'
npm_package_gitHead=ee9882658964e5e87359e0a6c8c2914e2ee5afb4
npm_package_license='SEE LICENSE IN LICENSE'
npm_package_name=foo-app
npm_package_private=true
npm_package_publishConfig_registry=
npm_package_readmeFilename=README.md
npm_package_repository_type=git
npm_package_repository_url=
npm_package_scripts_build='REACT_APP_VERSION=$npm_package_version react-scripts build'
npm_package_scripts_eject='react-scripts eject'
npm_package_scripts_foo='set | grep '\''npm_'\'' '
npm_package_scripts_start='REACT_APP_VERSION=$npm_package_version react-scripts start'
npm_package_scripts_test='react-scripts test --env=jsdom --verbose'
npm_package_version=0.3.2