There’s a function named checkNodeVersion() in father/src/cli/cli.ts.

This cli file has a function named run and in there, it calls a series of functions:

export async function run(_opts?: IOpts) {
  checkNodeVersion();
  checkLocal();
  setNodeTitle();
  setNoDeprecation();
  ...
}

• checkNodeVersion

• checkLocal

• setNodeTitle

• setNoDepreciation

We are interested in checkNodeVersion()

checkNodeVersion

checkNodeVersion is defined in cli/node.ts

export function checkVersion() {
  const v = parseInt(process.version.slice(1));
  if (v < MIN_NODE_VERSION || v === 15 || v === 17) {
    logger.error(
      `Your node version ${v} is not supported, please upgrade to ${MIN_NODE_VERSION} or above except 15 or 17.`,
    );
    process.exit(1);
  }
}

You can get the current node version using this method — process.version.slice(1)

In this function, there’s a side-effect. process exits if the node version does not meet the criteria defined in the if block.

logger.error logs the error message when the node version is not supported.

About me:

Hey, my name is Ramu Narasinga. I study large open-source projects and create content about their codebase architecture and best practices, sharing it through articles, videos.

I am open to work on interesting projects. Send me an email at ramu.narasinga@gmail.com

My Github — https://github.com/ramu-narasinga

My website — https://ramunarasinga.com

My Youtube channel — https://www.youtube.com/@thinkthroo

Learning platform — https://thinkthroo.com

Codebase Architecture — https://app.thinkthroo.com/architecture

Best practices — https://app.thinkthroo.com/best-practices

Production-grade projects — https://app.thinkthroo.com/production-grade-projects

References:

1. https://github.com/umijs/father/blob/master/src/cli/node.ts#L6

2. https://github.com/umijs/father/blob/master/src/cli/cli.ts#L17