diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
new file mode 100644
index 0000000..3d88f8a
--- /dev/null
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,14 @@
+name: Lint
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v1
+      with:
+        node-version: 16
+    - run: npm i
+    - run: npm run lint
diff --git a/full-icu.js b/full-icu.js
index 2dff5ff..2792d86 100644
--- a/full-icu.js
+++ b/full-icu.js
@@ -1,91 +1,90 @@
 // Copyright (C) 2015 IBM Corporation and Others. All Rights Reserved.
 
-//var process = require('process');
-//console.dir(process.env);
+// var process = require('process');
+// console.dir(process.env);
 
-var fs = require('fs');
-var path = require('path');
+const fs = require('fs')
+const path = require('path')
 
-if(!process || !process.versions || !process.versions.node) {
-	throw Error('Sorry- don’t know what version of Node you are on.');
+if (!process || !process.versions || !process.versions.node) {
+  throw Error('Sorry- don’t know what version of Node you are on.')
 }
 
-var nodever = module.exports.nodever = process.versions.node;
+const nodever = module.exports.nodever = process.versions.node
 
-var nodesplit = nodever.split('.');
+const nodesplit = nodever.split('.')
 
-var node_maj = module.exports.node_maj = nodesplit[0];
-var node_min = module.exports.node_min = nodesplit[1];
+const major = module.exports.node_maj = nodesplit[0]
+const minor = module.exports.node_min = nodesplit[1]
 
-if((node_maj == 0) && (node_min < 12)) {
-	module.exports.oldNode = true;
-} else if(process.config.variables.v8_enable_i18n_support === 0) {
-	module.exports.noi18n = true;
+if ((major === 0) && (minor < 12)) {
+  module.exports.oldNode = true
+} else if (process.config.variables.v8_enable_i18n_support === 0) {
+  module.exports.noi18n = true
 } else {
-	
-	/*
-	Commented until https://github.com/nodejs/node/issues/3460 is fixed.
-	
-	if( node_maj >= 7 ) { 
-		if( nodever === '7.0.0-pre' ) { 
-		module.exports.nodeDetectIcu = 'maybe'; 
-		} else { 
-		module.exports.nodeDetectIcu = true; 
-		} 
-	}
-	*/
-
-	if(!process.config.variables.icu_small) {
-		module.exports.icu_small = false;
-		// not going to work..
-		if(process.config.variables.icu_gyp_path === 'tools/icu/icu-system.gyp') {
-			// this will be the case under homebrew, redhat/fedora, others..
-			module.exports.icu_system = true;
-		}
-	} else {
-		module.exports.icu_small = true;
-	}
-	
-	var icuver;
-	var icuend = 'l';
-	
-	if(process.versions.icu) {
-		icuver = process.versions.icu; // Thanks https://github.com/nodejs/node/issues/3089
-	} else {
-		icuver = process.config.variables.icu_ver_major; // only get the major
-	}
-	
-	if(!icuver) {
-		throw Error('Cannot determine Node’s ICU version!');
-	} else {
-		module.exports.icuver = icuver;
-	}
-	
-	// get 'major' number
-	var icumaj = module.exports.icumaj = icuver.split('.')[0];
-	
-	if(process.config.variables.icu_endianness) {
-		icuend = process.config.variables.icu_endianness.toLowerCase();
-	}
-	
-	if( (icuend.length != 1) || ("lbe".indexOf(icuend) == -1)) {
-		throw Error('Don’t know what to make of endianness “'+icuend+'” - expected l, b, or e');
-	} else {
-		module.exports.icuend = icuend;
-	}
-	
-	var icupkg = module.exports.icupkg = "icu4c-data@" + icumaj+icuend;
-	
-	var icudat = module.exports.icudat = "icudt"+icumaj+icuend+".dat";
-	
-	var haveDat = module.exports.haveDat = function haveDat(d) {
-		if(!d) d = path.resolve(__dirname, icudat);
-		return fs.existsSync(d);
-	}
-	
-	var datPath = module.exports.datPath = function datPath(d) {
-		if(!d) d = path.resolve(__dirname, icudat);
-		if(haveDat(d)) return fs.realpathSync(d);
-		throw Error('Does not exist: ' + fs.realpathSync(d));
-	}
+  /*
+  Commented until https://github.com/nodejs/node/issues/3460 is fixed.
+
+  if( major >= 7 ) {
+    if( nodever === '7.0.0-pre' ) {
+    module.exports.nodeDetectIcu = 'maybe';
+    } else {
+    module.exports.nodeDetectIcu = true;
+    }
+  }
+  */
+
+  if (!process.config.variables.icu_small) {
+    module.exports.icu_small = false
+    // not going to work..
+    if (process.config.variables.icu_gyp_path === 'tools/icu/icu-system.gyp') {
+      // this will be the case under homebrew, redhat/fedora, others..
+      module.exports.icu_system = true
+    }
+  } else {
+    module.exports.icu_small = true
+  }
+
+  let icuver
+  let icuend = 'l'
+
+  if (process.versions.icu) {
+    icuver = process.versions.icu // Thanks https://github.com/nodejs/node/issues/3089
+  } else {
+    icuver = process.config.variables.icu_ver_major // only get the major
+  }
+
+  if (!icuver) {
+    throw Error('Cannot determine Node’s ICU version!')
+  } else {
+    module.exports.icuver = icuver
+  }
+
+  // get 'major' number
+  const icumaj = module.exports.icumaj = icuver.split('.')[0]
+
+  if (process.config.variables.icu_endianness) {
+    icuend = process.config.variables.icu_endianness.toLowerCase()
+  }
+
+  if ((icuend.length !== 1) || ('lbe'.indexOf(icuend) === -1)) {
+    throw Error('Don’t know what to make of endianness “' + icuend + '” - expected l, b, or e')
+  } else {
+    module.exports.icuend = icuend
+  }
+
+  module.exports.icupkg = 'icu4c-data@' + icumaj + icuend
+
+  const icudat = module.exports.icudat = 'icudt' + icumaj + icuend + '.dat'
+
+  const haveDat = module.exports.haveDat = function haveDat (d) {
+    if (!d) d = path.resolve(__dirname, icudat)
+    return fs.existsSync(d)
+  }
+
+  module.exports.datPath = function datPath (d) {
+    if (!d) d = path.resolve(__dirname, icudat)
+    if (haveDat(d)) return fs.realpathSync(d)
+    throw Error('Does not exist: ' + fs.realpathSync(d))
+  }
 }
diff --git a/install-spawn.js b/install-spawn.js
index 0f5611d..1a4bb4d 100644
--- a/install-spawn.js
+++ b/install-spawn.js
@@ -2,88 +2,86 @@
 
 // Install by using spawn
 
-var path = require('path');
-var fs = require('fs');
-var child_process = require('child_process');
+const path = require('path')
+const fs = require('fs')
+const spawnSync = require('child_process').spawnSync
 
-var isglobal = process.env.npm_config_global === 'true';
-var npmrc = '.npmrc';
-var npmrcPath = path.resolve(process.env.INIT_CWD, npmrc);
+const isglobal = process.env.npm_config_global === 'true'
+const npmrc = '.npmrc'
+const npmrcPath = path.resolve(process.env.INIT_CWD, npmrc)
 
 // uses semver regex from https://semver.org/
-const YARN_REGEX = /yarn(-(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?)?((.*cli)?\.c?js)?$/;
+const YARN_REGEX = /yarn(-(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?)?((.*cli)?\.c?js)?$/
 
-module.exports = function npmInstallNpm(fullIcu, advice) {
-	var icupkg = fullIcu.icupkg;
-	var icudat = fullIcu.icudat;
+module.exports = function npmInstallNpm (fullIcu, advice) {
+  const icupkg = fullIcu.icupkg
+  const icudat = fullIcu.icudat
 
-	var cmdPath = nodePath = process.env.npm_node_execpath;
+  let cmdPath = process.env.npm_node_execpath
 
-	var npmPath = process.env.npm_execpath;
+  const npmPath = process.env.npm_execpath
 
-	var args;
+  let args
 
+  if (YARN_REGEX.test(npmPath)) {
+    console.log('Looks like you are using yarn…')
+    args = [npmPath, 'add', icupkg, '--no-lockfile', '--ignore-scripts']
+  } else if (npmPath) {
+    args = [npmPath, 'install', icupkg]
+  } else {
+    // attempt to launch npm.
+    // do not try yarn here
+    console.log('(Hmm… doesn’t look like NPM called us. Let’s try calling NPM.)')
+    cmdPath = 'npm'
+    args = ['install', icupkg]
+  }
 
-	if (YARN_REGEX.test(npmPath) ) {
-		console.log('Looks like you are using yarn…');
-		installVerb = 'add';
-		args = [ npmPath, 'add', icupkg, '--no-lockfile', '--ignore-scripts' ];
-	} else if(npmPath) {
-		args = [ npmPath, 'install', icupkg ];
-	} else {
-		// attempt to launch npm.
-		// do not try yarn here
-		console.log('(Hmm… doesn’t look like NPM called us. Let’s try calling NPM.)');
-		cmdPath = 'npm';
-		args = [ 'install', icupkg ];
-	}
+  if (fs.existsSync(npmrcPath)) {
+    try {
+      fs.linkSync(npmrcPath, npmrc)
+    } catch (e) {
+      fs.symlinkSync(npmrcPath, npmrc)
+    }
+  }
 
-	if(fs.existsSync(npmrcPath)) {
-		try {
-			fs.linkSync(npmrcPath, npmrc);
-		} catch(e) {
-			fs.symlinkSync(npmrcPath, npmrc);
-		}
-	}
+  console.log('full-icu$', cmdPath, args.join(' '))
+  const spawned = spawnSync(cmdPath, args, { stdio: 'inherit' })
 
-	console.log('full-icu$', cmdPath, args.join(' '));
-	var spawned = child_process.spawnSync(cmdPath, args, { stdio: 'inherit' });
+  if (fs.existsSync(npmrc)) {
+    try {
+      fs.unlinkSync(npmrc)
+    } catch (e) {
+    }
+  }
 
-	if(fs.existsSync(npmrc)) {
-		try {
-			fs.unlinkSync(npmrc);
-		} catch(e) {
-		}
-	}
-
-	if(spawned.error) {
-		throw(spawned.error);
-	} else if(spawned.status !== 0) {
-		throw(Error(cmdPath + ' ' + args.join(' ') + ' --> status ' + spawned.status));
-	} else {
-		var datPath;
-		if(isglobal) {
-			datPath = path.join('..','icu4c-data',icudat);
-		} else {
-			datPath = path.join('node_modules','icu4c-data',icudat);
-		}
-		if(fs.existsSync(icudat)) {
-			console.log(' √ ' + icudat + " (existing link?)");
-		} else if(!fs.existsSync(datPath)) {
-			console.log(' • ' + ' (no ' + icudat + ' at ‘' + datPath+'’)');
-		} else {
-			try {
-                fs.linkSync(datPath, icudat);
-                console.log(' √ ' + icudat + " (link)");
-			} catch(e) {
-				fs.symlinkSync(datPath, icudat);
-				console.log(' √ ' + icudat + " (symlink)");
-			}
-		}
-		if(!fullIcu.haveDat()) {
-			throw Error('Somehow failed to install ' + icudat);
-		} else {
-			advice();
-		}
-	}
-};
+  if (spawned.error) {
+    throw (spawned.error)
+  } else if (spawned.status !== 0) {
+    throw (Error(cmdPath + ' ' + args.join(' ') + ' --> status ' + spawned.status))
+  } else {
+    let datPath
+    if (isglobal) {
+      datPath = path.join('..', 'icu4c-data', icudat)
+    } else {
+      datPath = path.join('node_modules', 'icu4c-data', icudat)
+    }
+    if (fs.existsSync(icudat)) {
+      console.log(' √ ' + icudat + ' (existing link?)')
+    } else if (!fs.existsSync(datPath)) {
+      console.log(' • ' + ' (no ' + icudat + ' at ‘' + datPath + '’)')
+    } else {
+      try {
+        fs.linkSync(datPath, icudat)
+        console.log(' √ ' + icudat + ' (link)')
+      } catch (e) {
+        fs.symlinkSync(datPath, icudat)
+        console.log(' √ ' + icudat + ' (symlink)')
+      }
+    }
+    if (!fullIcu.haveDat()) {
+      throw Error('Somehow failed to install ' + icudat)
+    } else {
+      advice()
+    }
+  }
+}
diff --git a/node-icu-data.js b/node-icu-data.js
index ab38a16..db2f2dd 100644
--- a/node-icu-data.js
+++ b/node-icu-data.js
@@ -1,11 +1,10 @@
 #!/usr/bin/env node
 // Copyright (C) 2015 IBM Corporation and Others. All Rights Reserved.
 
-var fullIcu = require('./full-icu');
+const fullIcu = require('./full-icu')
 
-if(!fullIcu.datPath) {
-	throw Error('Full data path not available');
+if (!fullIcu.datPath) {
+  throw Error('Full data path not available')
 } else {
-	console.log(fullIcu.datPath());
+  console.log(fullIcu.datPath())
 }
-
diff --git a/package.json b/package.json
index 834bc00..000b6e7 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "1.3.5-0",
   "description": "install 'full-icu' data for your current node",
   "scripts": {
+    "lint": "standard",
     "postinstall": "node postinstall.js"
   },
   "keywords": [
@@ -20,5 +21,8 @@
   },
   "bugs": {
     "url": "https://github.com/unicode-org/full-icu-npm/issues"
+  },
+  "devDependencies": {
+    "standard": "^16.0.3"
   }
 }
diff --git a/postinstall.js b/postinstall.js
index 27e44c7..c4241b4 100644
--- a/postinstall.js
+++ b/postinstall.js
@@ -1,74 +1,73 @@
 // Copyright (C) 2015 IBM Corporation and Others. All Rights Reserved.
 
-var fs = require('fs');
-var path = require('path');
-var fullIcu = require('./full-icu');
+const fs = require('fs')
+const path = require('path')
+const fullIcu = require('./full-icu')
 
+const myname = process.env.npm_package_name || 'full-icu'
 
-var myname = process.env.npm_package_name || 'full-icu';
-
-function exit(reason) {
-	console.log(reason);
-	process.exit(0);
+function exit (reason) {
+  console.log(reason)
+  process.exit(0)
 }
 
 if (fullIcu.oldNode) {
-	exit('Not sure how to handle node < 0.12. Exitting.');
+  exit('Not sure how to handle node < 0.12. Exitting.')
 } else if (fullIcu.noi18n) {
-	exit('Note: Your node was not compiled with i18n support. Nothing to do, Exitting.');
+  exit('Note: Your node was not compiled with i18n support. Nothing to do, Exitting.')
 } else if (fullIcu.icu_system) {
-	exit('Note: Your node was compiled to link against an ' +
-	'externally-provided ICU, so the locale data is not customizable ' +
-	'through this script. Exitting.');
+  exit('Note: Your node was compiled to link against an ' +
+    'externally-provided ICU, so the locale data is not customizable ' +
+    'through this script. Exitting.')
 } else if (!fullIcu.icu_small) {
-	// maybe already full icu, or some as-yet-unforseen case.
-	exit('Note: Your node was not compiled with the ‘small-icu’ case,' +
-	' so the ICU data is not customizable through this script. Exitting.');
-} else if( fullIcu.icumaj < 54 ) {
-	// This is kind of a sanity check that the ICU version is correct.
-	// ICU 54 was what Node v0.12 started with.
-	throw Error('Don’t know how to work with ICU version ' + fullIcu.icumaj + ', sorry.');
+  // maybe already full icu, or some as-yet-unforseen case.
+  exit('Note: Your node was not compiled with the ‘small-icu’ case,' +
+    ' so the ICU data is not customizable through this script. Exitting.')
+} else if (fullIcu.icumaj < 54) {
+  // This is kind of a sanity check that the ICU version is correct.
+  // ICU 54 was what Node v0.12 started with.
+  throw Error('Don’t know how to work with ICU version ' + fullIcu.icumaj + ', sorry.')
 }
 
-var cwd = fs.realpathSync('.');
+const cwd = fs.realpathSync('.')
 
-var isglobal = process.env.npm_config_global === 'true';
+const isglobal = process.env.npm_config_global === 'true'
 
-var relpath = isglobal ? cwd : path.join('node_modules',myname);
+const relpath = isglobal ? cwd : path.join('node_modules', myname)
 
-function advice() {
-	if( fullIcu.nodeDetectIcu ) {
-		console.log('Note: If you manually copy ' + path.join(relpath,fullIcu.icudat) + ' to the directory ' +
-			path.normalize(path.join(relpath,'..','.node-icu'))
-			 + ' node will automatically detect this data.');
-		if(fullIcu.nodeDetectIcu === 'maybe') {
-			console.log(' - at least when https://github.com/nodejs/node/issues/3460 lands');
-		}
-	}
+function advice () {
+  if (fullIcu.nodeDetectIcu) {
+    console.log('Note: If you manually copy ' + path.join(relpath, fullIcu.icudat) + ' to the directory ' +
+      path.normalize(path.join(relpath, '..', '.node-icu')) +
+      ' node will automatically detect this data.')
+    if (fullIcu.nodeDetectIcu === 'maybe') {
+      console.log(' - at least when https://github.com/nodejs/node/issues/3460 lands')
+    }
+  }
 
-	if(fullIcu.nodeDetectIcu !== true) {
-		console.log('Node will use this ICU datafile if the environment variable NODE_ICU_DATA is set to “'+relpath+'”');
-		console.log('or with node --icu-data-dir='+relpath+' YOURAPP.js' );
+  if (fullIcu.nodeDetectIcu !== true) {
+    console.log('Node will use this ICU datafile if the environment variable NODE_ICU_DATA is set to “' + relpath + '”')
+    console.log('or with node --icu-data-dir=' + relpath + ' YOURAPP.js')
 
-		var asJson = {scripts: { start: "node --icu-data-dir="+relpath + " YOURAPP.js" }};
-		console.log(" For package.json:");
-		console.log(JSON.stringify(asJson));
-	}
-	console.log("");
-	console.log("By the way, if you have full data, running this in node:");
-	// 9E8 is 10 days into January, so TimeZone independent
-	console.log("> new Intl.DateTimeFormat('es',{month:'long'}).format(new Date(9E8));");
-	console.log("... will show “enero”. If it shows “January” you don't have full data.");
+    const asJson = { scripts: { start: 'node --icu-data-dir=' + relpath + ' YOURAPP.js' } }
+    console.log(' For package.json:')
+    console.log(JSON.stringify(asJson))
+  }
+  console.log('')
+  console.log('By the way, if you have full data, running this in node:')
+  // 9E8 is 10 days into January, so TimeZone independent
+  console.log("> new Intl.DateTimeFormat('es',{month:'long'}).format(new Date(9E8));")
+  console.log("... will show “enero”. If it shows “January” you don't have full data.")
 }
 
 // install by using spawn
-var npmInstall = require('./install-spawn');
+const npmInstall = require('./install-spawn')
 
-if(fs.existsSync(fullIcu.icudat)) {
-	console.log('√ ' + fullIcu.icudat + ' Already there (for Node ' + fullIcu.nodever + ' and small-icu ' + fullIcu.icuver + ')');
-	advice();
+if (fs.existsSync(fullIcu.icudat)) {
+  console.log('√ ' + fullIcu.icudat + ' Already there (for Node ' + fullIcu.nodever + ' and small-icu ' + fullIcu.icuver + ')')
+  advice()
 } else {
-	console.log('npm install ' + fullIcu.icupkg + ' (Node ' + fullIcu.nodever + ' and small-icu ' + fullIcu.icuver + ') -> ' + fullIcu.icudat);
-	npmInstall(fullIcu, advice);
+  console.log('npm install ' + fullIcu.icupkg + ' (Node ' + fullIcu.nodever + ' and small-icu ' + fullIcu.icuver + ') -> ' + fullIcu.icudat)
+  npmInstall(fullIcu, advice)
 }
-console.log('News: Please see https://github.com/icu-project/full-icu-npm/issues/6');
+console.log('News: Please see https://github.com/icu-project/full-icu-npm/issues/6')