uglify Error: Cannot find module 'optimist' - javascript

I am going to uglify index.js file. But it throws this error: Cannot find module 'optimist'.
I have installed optimist: npm install optimist but it doesn't work. Anyone can help?
uglifyjs index.js
module.js:550
throw err;
^
Error: Cannot find module 'optimist'
at Function.Module._resolveFilename (module.js:548:15)
at Function.Module._load (module.js:475:25)
at Module.require (module.js:597:17)
at require (internal/module.js:11:18)
at Object.<anonymous> (/usr/lib/nodejs/uglify-js/bin/uglifyjs:8:16)
at Module._compile (module.js:653:30)
at Object.Module._extensions..js (module.js:664:10)
at Module.load (module.js:566:32)
at tryModuleLoad (module.js:506:12)
at Function.Module._load (module.js:498:3)

try this command,
npm i optimist --save
If It does not work then try this,
Delete node_modules folder & package-lock.json
&then try this command,
npm i --save

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Node.js cannot find module that is globally installed on MacOS

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I have also made sure that path to the global node_modules is present in the NODE_PATH environment variable.
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I feel I'm missing something rather simple here, but can't figure out what.
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└─┬ selenium-webdriver#4.0.0-alpha.1
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I am trying to use the dyson module node (https://github.com/webpro/dyson#installation). But, when i use de command dyson i get this error in my terminal.
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throw err;
^
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You have to install browserify.
npm install browserify
(or)
npm install browserify -g

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module.js:340
throw err;
^
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I have also tried uninstalled and reinstalled the node one time to fix this problem but no success.
I have also run the command sudo npm install -g to-fast-properties to install this module.
Can anyone help why this error is still coming?
browserify -t babelify app.js -o bundle.js
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throw err;
^
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at Function.Module._resolveFilename (module.js:336:15)
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at Module.require (module.js:365:17)
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