Is conditional requirement necessary for Express?

Currently, I am utilizing the reload package during development.

This particular package is listed under devDependancies within my package.json file.

Within my app.js, the following code snippet can be found:

if (process.env.NODE_ENV !== 'production') {
    reload(server, app)
}

Once built in Heroku's environment, all packages under devDependancies are removed, causing an error when trying to import reload with import reload from 'reload'. I should note that I utilize babel for production builds.

According to Heroku logs:

Error: Cannot find module 'reload'
2018-05-16T01:00:46.213772+00:00 app[web.1]:     at Function.Module._resolveFilename (internal/modules/cjs/loader.js:571:15)
2018-05-16T01:00:46.213773+00:00 app[web.1]:     at Function.Module._load (internal/modules/cjs/loader.js:497:25)
2018-05-16T01:00:46.213776+00:00 app[web.1]:     at Module.require (internal/modules/cjs/loader.js:626:17)

I am aware of the option to skip the "pruning" part, but I am more inclined to prevent the loading of the reload module during production instead.

How can I go about conditionally importing or requiring a package in this scenario?

node.jsexpressherokuproduction-environment

Answer №1

It is commonly recommended to place your import at the beginning of your code, although it is not mandatory.

if (process.env.NODE_ENV !== 'production') {
    require('reload')(server, app)
}

This snippet should function as expected.

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