fix: cannot find module ansis on Node.js < 14

[webdiscus]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no
Tests pass?	yes
Fixed tickets	#5984
License	MIT
Doc PR	https://github.com/pm2-hive/pm2-hive.github.io/pulls

Hello @Unitech,

This PR fixes the incompatibility with Node.js <= 12 introduced with the PR #5983. I'll leave this as a draft for now.

Although PM2 v6 officially requires at least Node.js 16, many users continue to run pm2 v6 on unsupported Node.js versions 10–12.

Many other dependencies require Node.js 14+:

• [email protected]
• [email protected]
• [email protected]
• [email protected]
• [email protected]
• [email protected]
• [email protected]
• [email protected]
• [email protected]

By the way, the README should be updated to say:

All Node.js versions are supported starting Node.js 14.x.

How to reproduce the issue

The pm2 6.0.6 uses package ansis 4.0.0 (node >= 14).
Check package.json:

"dependencies": {
  ..
 "ansis": "4.0.0",
  ..
}

Run from pm2 project directory:

docker run --rm -it -v "$PWD":/app -w /app --entrypoint bash node:10 -c './bin/pm2 ls'

Output:

internal/modules/cjs/loader.js:638
    throw err;
    ^

Error: Cannot find module 'ansis'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)
    at Function.Module._load (internal/modules/cjs/loader.js:562:25)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (internal/modules/cjs/helpers.js:25:18)
    at Object.<anonymous> (/app/constants.js:10:14)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)

How to fix this incompatibility issue

Replace ansis 4.0.0 with special version 4.0.0-node10 compatible with Node.js 10+:

"dependencies": {
 ..
- "ansis": "4.0.0",
+ "ansis": "4.0.0-node10",
 ..
}

Test pm2 with 4.0.0-node10 in Node.js 10

Run from pm2 project directory:

docker run --rm -it -v "$PWD":/app -w /app --entrypoint bash node:10 -c './bin/pm2 ls'

Output: