Convert project to an ES module (#28)

* Replace simple-assert with a throw

* Convert project to ES module

* Simplify karma config

* Remove unused dependencies

* Set `engines` key to node >= 12

* Remove `.travis.yml`

* Add back dependencies that are actually needed

* Update eslint and friends

* Remove obsolete build npm script

Co-authored-by: Keith Cirkel <[email protected]>

index.js

@@ -1,11 +1,3 @@
-'use strict';
-
-/* !
- * Chai - getFuncName utility
- * Copyright(c) 2012-2016 Jake Luer <[email protected]>
- * MIT Licensed
- */
-
 /**
  * ### .getFuncName(constructorFn)
  *
@@ -19,26 +11,28 @@
  * @api public
  */
 
-var toString = Function.prototype.toString;
-var functionNameMatch = /\s*function(?:\s|\s*\/\*[^(?:*\/)]+\*\/\s*)*([^\s\(\/]+)/;
+const { toString } = Function.prototype;
+const functionNameMatch = /\s*function(?:\s|\s*\/\*[^(?:*/)]+\*\/\s*)*([^\s(/]+)/;
 function getFuncName(aFunc) {
   if (typeof aFunc !== 'function') {
     return null;
   }
 
-  var name = '';
+  let name = '';
   if (typeof Function.prototype.name === 'undefined' && typeof aFunc.name === 'undefined') {
     // Here we run a polyfill if Function does not support the `name` property and if aFunc.name is not defined
-    var match = toString.call(aFunc).match(functionNameMatch);
+    // eslint-disable-next-line prefer-reflect
+    const match = toString.call(aFunc).match(functionNameMatch);
     if (match) {
-      name = match[1];
+      [ name ] = match;
     }
   } else {
     // If we've got a `name` property we just use it
+    // eslint-disable-next-line prefer-destructuring
     name = aFunc.name;
   }
 
   return name;
 }
 
-module.exports = getFuncName;
+export { getFuncName };

karma.conf.cjs

@@ -0,0 +1,15 @@
+module.exports = function configureKarma(config) {
+  config.set({
+    basePath: '.',
+    browsers: [ 'ChromeHeadless' ],
+    frameworks: [ 'mocha' ],
+    files: [
+      { pattern: './index.js', type: 'module' },
+      { pattern: './test/*.js', type: 'module' },
+    ],
+    reporters: [ 'progress' ],
+    colors: true,
+    autoWatch: false,
+    singleRun: true,
+  });
+};