all-node-versions/build/src/normalize.js

List all available Node.js versions

import semver from"semver";

import{groupBy}from"./group.js";


export const normalizeIndex=(index)=>{
const indexItems=index.map(normalizeVersion);
const versions=getAllVersions(indexItems);
const majors=getMajors(indexItems);
return{versions,majors}
};

const normalizeVersion=({version,lts,npm})=>{

const versionA=version.slice(1);
const major=semver.major(versionA);
return{version:versionA,major,lts,npm}
};


const getAllVersions=(indexItems)=>indexItems.map(getVersionField);

const getVersionField=({version,npm})=>({node:version,npm});



const getMajors=(indexItems)=>{
const groups=groupBy(indexItems,"major");

return Object.values(groups).map(getMajorInfo).sort(compareMajor)
};

const getMajorInfo=(versions)=>{
const[{major,version:latest}]=versions;
const lts=getLts(versions);
return{major,latest,...lts}
};

const getLts=(versions)=>{
const ltsVersion=versions.find(getLtsField);

if(ltsVersion===undefined){
return{}
}

const lts=ltsVersion.lts.toLowerCase();
return{lts}
};

const getLtsField=({lts})=>typeof lts==="string";


const compareMajor=({major:majorA},{major:majorB})=>
majorA<majorB?1:-1;