A npm version check that doesn't have any dependencies

assert-npm-version.js

#!/usr/bin/env node

// Embed semver module to make this script completely independent
// minified semver@5.1.0
// https://github.com/npm/node-semver
var semver={};!function(r){function e(r,e){if(r instanceof i)return r;if("string"!=typeof r)return null;if(r.length>L)return null;var t=e?F[pr]:F[ar];if(!t.test(r))return null;try{return new i(r,e)}catch(n){return null}}function t(r,t){var n=e(r,t);return n?n.version:null}function n(r,t){var n=e(r.trim().replace(/^[=v]+/,""),t);return n?n.version:null}function i(r,e){if(r instanceof i){if(r.loose===e)return r;r=r.version}else if("string"!=typeof r)throw new TypeError("Invalid Version: "+r);if(r.length>L)throw new TypeError("version is longer than "+L+" characters");if(!(this instanceof i))return new i(r,e);B("SemVer",r,e),this.loose=e;var t=r.trim().match(e?F[pr]:F[ar]);if(!t)throw new TypeError("Invalid Version: "+r);if(this.raw=r,this.major=+t[1],this.minor=+t[2],this.patch=+t[3],this.major>U||this.major<0)throw new TypeError("Invalid major version");if(this.minor>U||this.minor<0)throw new TypeError("Invalid minor version");if(this.patch>U||this.patch<0)throw new TypeError("Invalid patch version");t[4]?this.prerelease=t[4].split(".").map(function(r){if(/^[0-9]+$/.test(r)){var e=+r;if(e>=0&&U>e)return e}return r}):this.prerelease=[],this.build=t[5]?t[5].split("."):[],this.format()}function s(r,e,t,n){"string"==typeof t&&(n=t,t=void 0);try{return new i(r,t).inc(e,n).version}catch(s){return null}}function o(r,t){if(d(r,t))return null;var n=e(r),i=e(t);if(n.prerelease.length||i.prerelease.length){for(var s in n)if(("major"===s||"minor"===s||"patch"===s)&&n[s]!==i[s])return"pre"+s;return"prerelease"}for(var s in n)if(("major"===s||"minor"===s||"patch"===s)&&n[s]!==i[s])return s}function a(r,e){var t=Dr.test(r),n=Dr.test(e);return t&&n&&(r=+r,e=+e),t&&!n?-1:n&&!t?1:e>r?-1:r>e?1:0}function c(r,e){return a(e,r)}function u(r,e){return new i(r,e).major}function p(r,e){return new i(r,e).minor}function h(r,e){return new i(r,e).patch}function l(r,e,t){return new i(r,t).compare(e)}function f(r,e){return l(r,e,!0)}function v(r,e,t){return l(e,r,t)}function m(e,t){return e.sort(function(e,n){return r.compare(e,n,t)})}function g(e,t){return e.sort(function(e,n){return r.rcompare(e,n,t)})}function w(r,e,t){return l(r,e,t)>0}function y(r,e,t){return l(r,e,t)<0}function d(r,e,t){return 0===l(r,e,t)}function j(r,e,t){return 0!==l(r,e,t)}function E(r,e,t){return l(r,e,t)>=0}function b(r,e,t){return l(r,e,t)<=0}function $(r,e,t,n){var i;switch(e){case"===":"object"==typeof r&&(r=r.version),"object"==typeof t&&(t=t.version),i=r===t;break;case"!==":"object"==typeof r&&(r=r.version),"object"==typeof t&&(t=t.version),i=r!==t;break;case"":case"=":case"==":i=d(r,t,n);break;case"!=":i=j(r,t,n);break;case">":i=w(r,t,n);break;case">=":i=E(r,t,n);break;case"<":i=y(r,t,n);break;case"<=":i=b(r,t,n);break;default:throw new TypeError("Invalid operator: "+e)}return i}function k(r,e){if(r instanceof k){if(r.loose===e)return r;r=r.value}return this instanceof k?(B("comparator",r,e),this.loose=e,this.parse(r),this.semver===Xr?this.value="":this.value=this.operator+this.semver.version,void B("comp",this)):new k(r,e)}function R(r,e){if(r instanceof R&&r.loose===e)return r;if(!(this instanceof R))return new R(r,e);if(this.loose=e,this.raw=r,this.set=r.split(/\s*\|\|\s*/).map(function(r){return this.parseRange(r.trim())},this).filter(function(r){return r.length}),!this.set.length)throw new TypeError("Invalid SemVer Range: "+r);this.format()}function S(r,e){return new R(r,e).set.map(function(r){return r.map(function(r){return r.value}).join(" ").trim().split(" ")})}function I(r,e){return B("comp",r),r=A(r,e),B("caret",r),r=x(r,e),B("tildes",r),r=C(r,e),B("xrange",r),r=_(r,e),B("stars",r),r}function T(r){return!r||"x"===r.toLowerCase()||"*"===r}function x(r,e){return r.trim().split(/\s+/).map(function(r){return V(r,e)}).join(" ")}function V(r,e){var t=e?F[br]:F[Er];return r.replace(t,function(e,t,n,i,s){B("tilde",r,e,t,n,i,s);var o;return T(t)?o="":T(n)?o=">="+t+".0.0 <"+(+t+1)+".0.0":T(i)?o=">="+t+"."+n+".0 <"+t+"."+(+n+1)+".0":s?(B("replaceTilde pr",s),"-"!==s.charAt(0)&&(s="-"+s),o=">="+t+"."+n+"."+i+s+" <"+t+"."+(+n+1)+".0"):o=">="+t+"."+n+"."+i+" <"+t+"."+(+n+1)+".0",B("tilde return",o),o})}function A(r,e){return r.trim().split(/\s+/).map(function(r){return N(r,e)}).join(" ")}function N(r,e){B("caret",r,e);var t=e?F[Ir]:F[Sr];return r.replace(t,function(e,t,n,i,s){B("caret",r,e,t,n,i,s);var o;return T(t)?o="":T(n)?o=">="+t+".0.0 <"+(+t+1)+".0.0":T(i)?o="0"===t?">="+t+"."+n+".0 <"+t+"."+(+n+1)+".0":">="+t+"."+n+".0 <"+(+t+1)+".0.0":s?(B("replaceCaret pr",s),"-"!==s.charAt(0)&&(s="-"+s),o="0"===t?"0"===n?">="+t+"."+n+"."+i+s+" <"+t+"."+n+"."+(+i+1):">="+t+"."+n+"."+i+s+" <"+t+"."+(+n+1)+".0":">="+t+"."+n+"."+i+s+" <"+(+t+1)+".0.0"):(B("no pr"),o="0"===t?"0"===n?">="+t+"."+n+"."+i+" <"+t+"."+n+"."+(+i+1):">="+t+"."+n+"."+i+" <"+t+"."+(+n+1)+".0":">="+t+"."+n+"."+i+" <"+(+t+1)+".0.0"),B("caret return",o),o})}function C(r,e){return B("replaceXRanges",r,e),r.split(/\s+/).map(function(r){return M(r,e)}).join(" ")}function M(r,e){r=r.trim();var t=e?F[wr]:F[gr];return r.replace(t,function(e,t,n,i,s,o){B("xRange",r,e,t,n,i,s,o);var a=T(n),c=a||T(i),u=c||T(s),p=u;return"="===t&&p&&(t=""),a?e=">"===t||"<"===t?"<0.0.0":"*":t&&p?(c&&(i=0),u&&(s=0),">"===t?(t=">=",c?(n=+n+1,i=0,s=0):u&&(i=+i+1,s=0)):"<="===t&&(t="<",c?n=+n+1:i=+i+1),e=t+n+"."+i+"."+s):c?e=">="+n+".0.0 <"+(+n+1)+".0.0":u&&(e=">="+n+"."+i+".0 <"+n+"."+(+i+1)+".0"),B("xRange return",e),e})}function _(r,e){return B("replaceStars",r,e),r.trim().replace(F[Mr],"")}function D(r,e,t,n,i,s,o,a,c,u,p,h,l){return e=T(t)?"":T(n)?">="+t+".0.0":T(i)?">="+t+"."+n+".0":">="+e,a=T(c)?"":T(u)?"<"+(+c+1)+".0.0":T(p)?"<"+c+"."+(+u+1)+".0":h?"<="+c+"."+u+"."+p+"-"+h:"<="+a,(e+" "+a).trim()}function X(r,e){for(var t=0;t<r.length;t++)if(!r[t].test(e))return!1;if(e.prerelease.length){for(var t=0;t<r.length;t++)if(B(r[t].semver),r[t].semver!==Xr&&r[t].semver.prerelease.length>0){var n=r[t].semver;if(n.major===e.major&&n.minor===e.minor&&n.patch===e.patch)return!0}return!1}return!0}function z(r,e,t){try{e=new R(e,t)}catch(n){return!1}return e.test(r)}function G(r,e,t){return r.filter(function(r){return z(r,e,t)}).sort(function(r,e){return v(r,e,t)})[0]||null}function O(r,e){try{return new R(r,e).range||"*"}catch(t){return null}}function P(r,e,t){return q(r,e,"<",t)}function Z(r,e,t){return q(r,e,">",t)}function q(r,e,t,n){r=new i(r,n),e=new R(e,n);var s,o,a,c,u;switch(t){case">":s=w,o=b,a=y,c=">",u=">=";break;case"<":s=y,o=E,a=w,c="<",u="<=";break;default:throw new TypeError('Must provide a hilo val of "<" or ">"')}if(z(r,e,n))return!1;for(var p=0;p<e.set.length;++p){var h=e.set[p],l=null,f=null;if(h.forEach(function(r){r.semver===Xr&&(r=new k(">=0.0.0")),l=l||r,f=f||r,s(r.semver,l.semver,n)?l=r:a(r.semver,f.semver,n)&&(f=r)}),l.operator===c||l.operator===u)return!1;if((!f.operator||f.operator===c)&&o(r,f.semver))return!1;if(f.operator===u&&a(r,f.semver))return!1}return!0}var B;B="object"==typeof process&&process.env&&process.env.NODE_DEBUG&&/\bsemver\b/i.test(process.env.NODE_DEBUG)?function(){var r=Array.prototype.slice.call(arguments,0);r.unshift("SEMVER"),console.log.apply(console,r)}:function(){},r.SEMVER_SPEC_VERSION="2.0.0";var L=256,U=Number.MAX_SAFE_INTEGER||9007199254740991,F=r.re=[],H=r.src=[],J=0,K=J++;H[K]="0|[1-9]\\d*";var Q=J++;H[Q]="[0-9]+";var W=J++;H[W]="\\d*[a-zA-Z-][a-zA-Z0-9-]*";var Y=J++;H[Y]="("+H[K]+")\\.("+H[K]+")\\.("+H[K]+")";var rr=J++;H[rr]="("+H[Q]+")\\.("+H[Q]+")\\.("+H[Q]+")";var er=J++;H[er]="(?:"+H[K]+"|"+H[W]+")";var tr=J++;H[tr]="(?:"+H[Q]+"|"+H[W]+")";var nr=J++;H[nr]="(?:-("+H[er]+"(?:\\."+H[er]+")*))";var ir=J++;H[ir]="(?:-?("+H[tr]+"(?:\\."+H[tr]+")*))";var sr=J++;H[sr]="[0-9A-Za-z-]+";var or=J++;H[or]="(?:\\+("+H[sr]+"(?:\\."+H[sr]+")*))";var ar=J++,cr="v?"+H[Y]+H[nr]+"?"+H[or]+"?";H[ar]="^"+cr+"$";var ur="[v=\\s]*"+H[rr]+H[ir]+"?"+H[or]+"?",pr=J++;H[pr]="^"+ur+"$";var hr=J++;H[hr]="((?:<|>)?=?)";var lr=J++;H[lr]=H[Q]+"|x|X|\\*";var fr=J++;H[fr]=H[K]+"|x|X|\\*";var vr=J++;H[vr]="[v=\\s]*("+H[fr]+")(?:\\.("+H[fr]+")(?:\\.("+H[fr]+")(?:"+H[nr]+")?"+H[or]+"?)?)?";var mr=J++;H[mr]="[v=\\s]*("+H[lr]+")(?:\\.("+H[lr]+")(?:\\.("+H[lr]+")(?:"+H[ir]+")?"+H[or]+"?)?)?";var gr=J++;H[gr]="^"+H[hr]+"\\s*"+H[vr]+"$";var wr=J++;H[wr]="^"+H[hr]+"\\s*"+H[mr]+"$";var yr=J++;H[yr]="(?:~>?)";var dr=J++;H[dr]="(\\s*)"+H[yr]+"\\s+",F[dr]=new RegExp(H[dr],"g");var jr="$1~",Er=J++;H[Er]="^"+H[yr]+H[vr]+"$";var br=J++;H[br]="^"+H[yr]+H[mr]+"$";var $r=J++;H[$r]="(?:\\^)";var kr=J++;H[kr]="(\\s*)"+H[$r]+"\\s+",F[kr]=new RegExp(H[kr],"g");var Rr="$1^",Sr=J++;H[Sr]="^"+H[$r]+H[vr]+"$";var Ir=J++;H[Ir]="^"+H[$r]+H[mr]+"$";var Tr=J++;H[Tr]="^"+H[hr]+"\\s*("+ur+")$|^$";var xr=J++;H[xr]="^"+H[hr]+"\\s*("+cr+")$|^$";var Vr=J++;H[Vr]="(\\s*)"+H[hr]+"\\s*("+ur+"|"+H[vr]+")",F[Vr]=new RegExp(H[Vr],"g");var Ar="$1$2$3",Nr=J++;H[Nr]="^\\s*("+H[vr]+")\\s+-\\s+("+H[vr]+")\\s*$";var Cr=J++;H[Cr]="^\\s*("+H[mr]+")\\s+-\\s+("+H[mr]+")\\s*$";var Mr=J++;H[Mr]="(<|>)?=?\\s*\\*";for(var _r=0;J>_r;_r++)B(_r,H[_r]),F[_r]||(F[_r]=new RegExp(H[_r]));r.parse=e,r.valid=t,r.clean=n,r.SemVer=i,i.prototype.format=function(){return this.version=this.major+"."+this.minor+"."+this.patch,this.prerelease.length&&(this.version+="-"+this.prerelease.join(".")),this.version},i.prototype.toString=function(){return this.version},i.prototype.compare=function(r){return B("SemVer.compare",this.version,this.loose,r),r instanceof i||(r=new i(r,this.loose)),this.compareMain(r)||this.comparePre(r)},i.prototype.compareMain=function(r){return r instanceof i||(r=new 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var npmVersion = process.env.npm_package_engines_npm;
var ua = process.env.npm_config_user_agent
if (!ua) throw new Error('This script does only work when you run it in a npm hook')

// Get current npm version
var npmOffset = ua.indexOf('npm/')+4
var lastVersionCharIndex = ua.indexOf(' ', npmOffset)
if (lastVersionCharIndex == -1) lastVersionCharIndex = ua.length
var currentNpmVersion = ua.substring(npmOffset, lastVersionCharIndex)
if (!semver.satisfies(currentNpmVersion, npmVersion)) throwErr(npmVersion, currentNpmVersion)

function throwErr (desired, current) {
  msg = '-------------------------------------------------\n'
  msg +='  Failed to satisfy expected npm version: :v     \n'.replace(':v', desired)
  msg +='  You used npm version: :v                       \n'.replace(':v', current)
  msg +='-------------------------------------------------'
  console.error(msg)
  process.exit(1)
}