head-starter

project creator: execute a set of standard processes and installations into a directory

• 📋 Why
• ✅ What
• 💡 How
• 🔧 Example
• ⚡ Steps to Create a Setup Sequence
• ❗ API

📋 Why

If you want to create (or let others create) a type of project multiple times, you probably execute some common commands and install the latest version of several packages.

In effect, you go through standard steps for whatever type of app you are templating.

It would be nice to provide that easily for yourself or others. Like a create package.

✅ What

An function for executing a startup sequence. The sequence is specified within a json that includes a set of commands that you normally execute.

💡 How

Install:

npm i head-start

Then call directly:

const createStarter = require('head-start')

const setupSequence = {
  "preCommands": [
    {
      "title": "run git",
      "file": "git",
      "arguments": [
        "init",
        "$codeDir"
      ]
    },
    {
      "title": "create package.json",
      "file": "npm",
      "arguments": [
        "init",
        "-y"
      ],
      "options": {
        "cwd": "$codeDir"
      }
    }
  ],
  "mainInstallation": [
    "@types/node@14.14.19",
    "tslib@2.0.3",
    "typescript@4.1.3",
    "path"
  ],
  "devInstallation": [
    "@typescript-eslint/eslint-plugin@4.12.0",
    "@typescript-eslint/parser@4.12.0",
    "eslint@7.17.0",
    "prettier@2.2.1",
    "nyc@14.1.1",
    "ava",
    "ts-node"
  ]
}

const codeDir = '~/temp/mySample'
const session = {
  "notWin": true,
  "userName": "YizYah",
  "defaultProjectName": "mySample"
}

await createStarter(
  setupSequence, codeDir, session, false
)

Arguments

• setupSequence is a SetupSequence from the Configuration type exposed in magicalstrings
• codeDir is the path to the directory to create. If it exists already, an error is thrown.
• session is a dynamically declared mapping of keys and string values used with dynamapping to replace any instances in setupSequence. Note that $codeDir is a special reserved string for the value of codeDir.

🔧 Example

It is used inside geenee templates, where setupSequence is including in the config.yml file.

⚡Steps to Create a Setup Sequence

---

Note You can use copykat to guide you through the process of creating a full geenee template, including the the startup sequence. You can even do that and then copy the startupSequence from the config.yml file of the generated template.

---

See the config file for the sample template as a model.

There are four keys under setupSequence:

1. interactive

2. preCommands

3. mainInstallation

4. devInstallation

Each is discussed in its own section.

interactive

You may start the process of generating code by running any number of interactive programs. These can even be bash scripts included in your template file. You specify a list, and they get executed in the same order. For each, provide:

• file the name of the command or bash script that you want to execute. (Note: npx is usually the best option for a released package. That lets you get the latest version and removes the need for a template user to have something installed globally. So, rather than running oclif, you would run npx and make oclif the first argument)

• arguments the list of arguments passed into the command. These are strings.

  There is currently one general variable that you can use in arguments: $codeDir. The value of $codeDir is whatever the name of the code base that gets passed by the user to ns generate.

• options an optional list of the options for child_process.

An example of an interactive entry would be this:

setupSequence:
    ...
    interactive:
       - file: npx
         arguments:
           - oclif
           - multi
           - $codeDir

This list consists of a single command--running oclif using npx. The name that gets passed to oclif as an argument should be replaced by the name of your $SAMPLE code.

All of the interactive list will be executed in order. The user will have the opportunity to insert anything needed as prompted.

Note It is actually better to insert any command that is not interactive [that executes without user interactions] under precommands as specified below. It is better to have multiple templates that leave as little as possible up to the user running ns generate. The only reason for interactive is that some programs do not allow you to specify options programmatically, so you have to run them interactively.

preCommands

This is a list of uninteractive files or programs that get executed automatically in the order that you place them.

• A title will show up when your template user watches the progress from the command prompt.
• The same 3 keys shown in interactive above: file, arguments and perhaps options.

The purpose of preCommands is to run tools like createReactApp. Note that you could create a bash script, stored in your template directory, to execute. So you have the ability to run whatever sequence you like.

mainInstallation

This is an array of packages that get installed by npm. See the sample config file.

devInstallation

An array of packages that get installed by npm for dev.

Again, see the sample config file.

Leaving Versions Dynamic

A big goal of geenee is to let you have the latest of everything in your stack, so we encourage this approach rather than providing a hardcoded package.json file. On the debit side, you need to be sure to update any code if conflicts arise with the latest versions of packages used.

If need be, you can of course hardcode the version of a package listed in mainInstallation or devInstallation, e.g. '@apollo/react-hoc@3.1.5' in the config file for the sample template.

❗ API