Possible to install all missing modules for a node application?

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南旧
南旧 2021-01-30 21:13

I have a node app that I just started working with and each time I try to run it, it says there is a missing module. I\'ve just been using npm install ... for each

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  • 2021-01-30 21:22

    Yes, as long as the dependency is listed in package.json.

    In the directory that contains package.json, just type:

    npm install
    
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  • 2021-01-30 21:27

    You can run npm install yourModule --save in order to install and automatically update package.json with this newly installed module.

    So when you run npm install a second time it will install every dependecy previously added and you won't need to reinstall every dependency one by one.

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  • 2021-01-30 21:32

    I have written a script for this.
    Place it at the start of your script, and any uninstalled modules will be installed when you run it.

    (function () {
      var r = require
      require = function (n) {
        try {
          return r(n)
        } catch (e) {
          console.log(`Module "${n}" was not found and will be installed`)
          r('child_process').exec(`npm i ${n}`, function (err, body) {
            if (err) {
              console.log(`Module "${n}" could not be installed. Try again or install manually`)
              console.log(body)
              exit(1)
            } else {
              console.log(`Module "${n}" was installed. Will try to require again`)
              try{
                return r(n)
              } catch (e) {
                console.log(`Module "${n}" could not be required. Please restart the app`)
                console.log(e)
                exit(1)
              }
            }
          })
        }
      }
    })()
    
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  • 2021-01-30 21:34

    I was inspired by @Aminadav Glickshtein's answer to create a script of my own that would synchronously install the needed modules, because his answer lacks these capabilities.

    I needed some help, so I started an SO question here. You can read about how this script works there.
    The result is as follows:

    const cp = require('child_process')
    
    const req = async module => {
      try {
        require.resolve(module)
      } catch (e) {
        console.log(`Could not resolve "${module}"\nInstalling`)
        cp.execSync(`npm install ${module}`)
        await setImmediate(() => {})
        console.log(`"${module}" has been installed`)
      }
      console.log(`Requiring "${module}"`)
      try {
        return require(module)
      } catch (e) {
        console.log(`Could not include "${module}". Restart the script`)
        process.exit(1)
      }
    }
    
    const main = async () => {
      const http    = await req('http')
      const path    = await req('path')
      const fs      = await req('fs')
      const express = await req('express')
    
      // The rest of the app's code goes here
    }
    
    main()
    

    And a one-liner (139 characters!). It doesn't globally define child_modules, has no last try-catch and doesn't log anything in the console:

    const req=async m=>{let r=require;try{r.resolve(m)}catch(e){r('child_process').execSync('npm i '+m);await setImmediate(()=>{})}return r(m)}
    
    const main = async () => {
      const http    = await req('http')
      const path    = await req('path')
      const fs      = await req('fs')
      const express = await req('express')
    
      // The rest of the app's code goes here
    }
    
    main()
    
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  • 2021-01-30 21:41

    I created an npm module to handle installing missing modules automatically.

    npm-install-missing

    It will install all app dependencies and sub-dependencies automatically. This is useful when submodules aren't installed correctly.

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