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"ReferenceError: <package> not defined" despite installing the package

I have a folder in which i have ran npm install chevrotain successfully. Running npm -v chevrotain gives 8.1.2 and I have "chevrotain": "^10.1.2" under my dependencies in my package.json but on running a simple js file in the same folder I get the error ReferenceError: chevrotain is not defined. The js file just has one line of code const createToken = chevrotain.createToken.

Any reasons why that could happen?

about 4 years ago · Santiago Gelvez
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Having a package installed in your project doesn't create global variables in every module.

You need to explicitly import it using require (for CommonJS modules) or import (for ES modules).

The documentation for the module you are giving provides an example:

const chevrotain = require("chevrotain")
about 4 years ago · Santiago Gelvez Report
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