当我安装webpack时出现此错误，我尝试添加sudo并询问系统有关密码的问题，但仍然显示此错误，我不知道该怎么办，对此我是陌生的，可以有人帮我吗出来吗？
ULinChendeMacBook:~ ulin$ sudo npm i -g webpack
Password:
/usr/local/bin/webpack -> /usr/local/lib/node_modules/webpack/bin/webpack.js
> fsevents@1.2.9 install /usr/local/lib/node_modules/webpack/node_modules/fsevents
> node install
node-pre-gyp WARN Using needle for node-pre-gyp https download
node-pre-gyp WARN Pre-built binaries not installable for fsevents@1.2.9 and node@12.6.0 (node-v72 ABI, unknown) (falling back to source compile with node-gyp)
node-pre-gyp WARN Hit error EACCES: permission denied, mkdir '/usr/local/lib/node_modules/webpack/node_modules/fsevents/lib'
gyp ERR! configure error
gyp ERR! stack Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules/webpack/node_modules/fsevents/build'
gyp ERR! System Darwin 18.2.0
gyp ERR! command "/usr/local/bin/node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "configure" "--fallback-to-build" "--module=/usr/local/lib/node_modules/webpack/node_modules/fsevents/lib/binding/Release/node-v72-darwin-x64/fse.node" "--module_name=fse" "--module_path=/usr/local/lib/node_modules/webpack/node_modules/fsevents/lib/binding/Release/node-v72-darwin-x64" "--napi_version=4" "--node_abi_napi=napi" "--napi_build_version=0" "--node_napi_label=node-v72"
gyp ERR! cwd /usr/local/lib/node_modules/webpack/node_modules/fsevents
gyp ERR! node -v v12.6.0
gyp ERR! node-gyp -v v3.8.0
gyp ERR! not ok
node-pre-gyp ERR! build error
node-pre-gyp ERR! stack Error: Failed to execute '/usr/local/bin/node /usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js configure --fallback-to-build --module=/usr/local/lib/node_modules/webpack/node_modules/fsevents/lib/binding/Release/node-v72-darwin-x64/fse.node --module_name=fse --module_path=/usr/local/lib/node_modules/webpack/node_modules/fsevents/lib/binding/Release/node-v72-darwin-x64 --napi_version=4 --node_abi_napi=napi --napi_build_version=0 --node_napi_label=node-v72' (1)
node-pre-gyp ERR! stack at ChildProcess.<anonymous> (/usr/local/lib/node_modules/webpack/node_modules/fsevents/node_modules/node-pre-gyp/lib/util/compile.js:83:29)
node-pre-gyp ERR! stack at ChildProcess.emit (events.js:203:13)
node-pre-gyp ERR! stack at maybeClose (internal/child_process.js:1021:16)
node-pre-gyp ERR! stack at Process.ChildProcess._handle.onexit (internal/child_process.js:283:5)
node-pre-gyp ERR! System Darwin 18.2.0
node-pre-gyp ERR! command "/usr/local/bin/node" "/usr/local/lib/node_modules/webpack/node_modules/fsevents/node_modules/node-pre-gyp/bin/node-pre-gyp" "install" "--fallback-to-build"
node-pre-gyp ERR! cwd /usr/local/lib/node_modules/webpack/node_modules/fsevents
node-pre-gyp ERR! node -v v12.6.0
node-pre-gyp ERR! node-pre-gyp -v v0.12.0
node-pre-gyp ERR! not ok
Failed to execute '/usr/local/bin/node /usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js configure --fallback-to-build --module=/usr/local/lib/node_modules/webpack/node_modules/fsevents/lib/binding/Release/node-v72-darwin-x64/fse.node --module_name=fse --module_path=/usr/local/lib/node_modules/webpack/node_modules/fsevents/lib/binding/Release/node-v72-darwin-x64 --napi_version=4 --node_abi_napi=napi --napi_build_version=0 --node_napi_label=node-v72' (1)
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.9 (node_modules/webpack/node_modules/fsevents):
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.9 install: `node install`
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: Exit status 1