Various cleanups and updates

- Switch ESLint for JSHint
- Start enforcing the use of newer syntax (as long as it's Node v4 compatible)
- Add .editorconfig
- Remove old dependencies no longer needed as of bb51e07
- Add package-lock.json
- Use inline Markdown links in the readme

Author: domenic

.editorconfig

@@ -0,0 +1,12 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+indent_style = space
+indent_size = 4
+
+[.eslintrc.json]
+indent_size = 2

.eslintignore

@@ -0,0 +1 @@
+coverage/

.eslintrc.json

@@ -0,0 +1,236 @@
+{
+  "root": true,
+  "env": {
+    "node": true,
+    "es6": true
+  },
+  "parserOptions": {
+    "ecmaVersion": 6
+  },
+  "rules": {
+    // Possible errors
+    "comma-dangle": ["error", "never"],
+    "no-cond-assign": ["error", "except-parens"],
+    "no-console": "error",
+    "no-constant-condition": "error",
+    "no-control-regex": "error",
+    "no-debugger": "error",
+    "no-dupe-args": "error",
+    "no-dupe-keys": "error",
+    "no-duplicate-case": "error",
+    "no-empty": "error",
+    "no-empty-character-class": "error",
+    "no-ex-assign": "error",
+    "no-extra-boolean-cast": "error",
+    "no-extra-parens": ["error", "all", { "conditionalAssign": false, "nestedBinaryExpressions": false }],
+    "no-extra-semi": "error",
+    "no-func-assign": "error",
+    "no-inner-declarations": "off",
+    "no-invalid-regexp": "error",
+    "no-irregular-whitespace": "error",
+    "no-negated-in-lhs": "error",
+    "no-obj-calls": "error",
+    "no-regex-spaces": "error",
+    "no-sparse-arrays": "error",
+    "no-unexpected-multiline": "error",
+    "no-unreachable": "error",
+    "no-unsafe-finally": "off",
+    "use-isnan": "error",
+    "valid-jsdoc": "off",
+    "valid-typeof": "error",
+
+    // Best practices
+    "accessor-pairs": "error",
+    "array-callback-return": "error",
+    "block-scoped-var": "off",
+    "complexity": "off",
+    "consistent-return": "error",
+    "curly": ["error", "all"],
+    "default-case": "off",
+    "dot-location": ["error", "property"],
+    "dot-notation": "error",
+    "eqeqeq": "error",
+    "guard-for-in": "off",
+    "no-alert": "error",
+    "no-caller": "error",
+    "no-case-declarations": "error",
+    "no-div-regex": "off",
+    "no-else-return": "error",
+    "no-empty-function": "error",
+    "no-empty-pattern": "error",
+    "no-eq-null": "error",
+    "no-eval": "error",
+    "no-extend-native": "error",
+    "no-extra-bind": "error",
+    "no-extra-label": "error",
+    "no-fallthrough": "error",
+    "no-floating-decimal": "error",
+    "no-implicit-coercion": "error",
+    "no-implicit-globals": "error",
+    "no-implied-eval": "off",
+    "no-invalid-this": "error",
+    "no-iterator": "error",
+    "no-labels": ["error", { "allowLoop": true }],
+    "no-lone-blocks": "error",
+    "no-loop-func": "off",
+    "no-magic-numbers": "off",
+    "no-multi-spaces": "error",
+    "no-multi-str": "error",
+    "no-native-reassign": "error",
+    "no-new": "error",
+    "no-new-func": "error",
+    "no-new-wrappers": "error",
+    "no-octal": "error",
+    "no-octal-escape": "error",
+    "no-param-reassign": "off",
+    "no-process-env": "error",
+    "no-proto": "error",
+    "no-redeclare": "error",
+    "no-return-assign": ["error", "except-parens"],
+    "no-script-url": "off",
+    "no-self-assign": "error",
+    "no-self-compare": "error",
+    "no-sequences": "error",
+    "no-throw-literal": "error",
+    "no-unmodified-loop-condition": "error",
+    "no-unused-expressions": "error",
+    "no-unused-labels": "error",
+    "no-useless-call": "error",
+    "no-useless-concat": "error",
+    "no-useless-escape": "error",
+    "no-void": "error",
+    "no-warning-comments": "off",
+    "no-with": "error",
+    "radix": ["error", "as-needed"],
+    "vars-on-top": "off",
+    "wrap-iife": ["error", "outside"],
+    "yoda": ["error", "never"],
+
+    // Strict Mode
+    "strict": ["error", "global"],
+
+    // Variables
+    "init-declarations": "off",
+    "no-catch-shadow": "error",
+    "no-delete-var": "error",
+    "no-label-var": "error",
+    "no-restricted-globals": "off",
+    "no-shadow": "error",
+    "no-shadow-restricted-names": "error",
+    "no-undef": "error",
+    "no-undef-init": "error",
+    "no-undefined": "off",
+    "no-unused-vars": "error",
+    "no-use-before-define": ["error", "nofunc"],
+
+    // Node.js and CommonJS
+    "callback-return": "off",
+    "global-require": "error",
+    "handle-callback-err": "error",
+    "no-mixed-requires": ["error", true],
+    "no-new-require": "error",
+    "no-path-concat": "error",
+    "no-process-exit": "error",
+    "no-restricted-imports": "off",
+    "no-restricted-modules": "off",
+    "no-sync": "off",
+
+    // Stylistic Issues
+    "array-bracket-spacing": ["error", "never"],
+    "block-spacing": ["error", "always"],
+    "brace-style": ["error", "1tbs", { "allowSingleLine": false }],
+    "camelcase": ["error", { "properties": "always" }],
+    "comma-spacing": ["error", { "before": false, "after": true }],
+    "comma-style": ["error", "last"],
+    "computed-property-spacing": ["error", "never"],
+    "consistent-this": "off",
+    "eol-last": "error",
+    "func-names": "off",
+    "func-style": ["error", "declaration"],
+    "id-blacklist": "off",
+    "id-length": "off",
+    "id-match": "off",
+    "indent": ["error", 4, { "SwitchCase": 1 }],
+    "jsx-quotes": "off",
+    "key-spacing": ["error", { "beforeColon": false, "afterColon": true, "mode": "strict" }],
+    "keyword-spacing": ["error", { "before": true, "after": true }],
+    "linebreak-style": ["error", "unix"],
+    "lines-around-comment": "off",
+    "max-depth": "off",
+    "max-len": ["error", 120, { "ignoreUrls": true }],
+    "max-nested-callbacks": "off",
+    "max-params": "off",
+    "max-statements": "off",
+    "max-statements-per-line": ["error", { "max": 1 }],
+    "new-cap": "error",
+    "new-parens": "error",
+    "newline-after-var": "off",
+    "newline-before-return": "off",
+    "newline-per-chained-call": "off",
+    "no-array-constructor": "error",
+    "no-bitwise": "off",
+    "no-continue": "off",
+    "no-inline-comments": "off",
+    "no-lonely-if": "error",
+    "no-mixed-spaces-and-tabs": "error",
+    "no-multiple-empty-lines": "error",
+    "no-negated-condition": "off",
+    "no-nested-ternary": "error",
+    "no-new-object": "error",
+    "no-plusplus": "off",
+    "no-restricted-syntax": "off",
+    "no-spaced-func": "error",
+    "no-ternary": "off",
+    "no-trailing-spaces": "error",
+    "no-underscore-dangle": "off",
+    "no-unneeded-ternary": "error",
+    "no-whitespace-before-property": "error",
+    "object-curly-spacing": ["error", "always"],
+    "one-var": ["error", "never"],
+    "one-var-declaration-per-line": ["error", "initializations"],
+    "operator-assignment": ["error", "always"],
+    "operator-linebreak": ["error", "after"],
+    "padded-blocks": ["error", "never"],
+    "quote-props": ["error", "as-needed"],
+    "quotes": ["error", "double", { "avoidEscape": true, "allowTemplateLiterals": true }],
+    "require-jsdoc": "off",
+    "semi": ["error", "always"],
+    "semi-spacing": "error",
+    "sort-imports": "off",
+    "sort-vars": "off",
+    "space-before-blocks": ["error", "always"],
+    "space-before-function-paren": ["error", { "anonymous": "always", "named": "never" }],
+    "space-in-parens": ["error", "never"],
+    "space-infix-ops": "error",
+    "space-unary-ops": ["error", { "words": true, "nonwords": false }],
+    "spaced-comment": ["error", "always", { "markers": ["///"] }],
+    "wrap-regex": "off",
+
+    // ECMAScript 6
+    "arrow-body-style": "off", // meh
+    "arrow-parens": ["error", "as-needed"],
+    "arrow-spacing": "error",
+    "constructor-super": "error",
+    "generator-star-spacing": ["error", "after"],
+    "no-class-assign": "error",
+    "no-confusing-arrow": "off",
+    "no-const-assign": "error",
+    "no-dupe-class-members": "error",
+    "no-duplicate-imports": "error",
+    "no-new-symbol": "error",
+    "no-this-before-super": "error",
+    "no-useless-computed-key": "error",
+    "no-useless-constructor": "error",
+    "no-var": "error",
+    "object-shorthand": "error",
+    "prefer-arrow-callback": "error",
+    "prefer-const": "error",
+    "prefer-reflect": "off",
+    "prefer-rest-params": "off",
+    "prefer-spread": "off",
+    "prefer-template": "off",
+    "require-yield": "error",
+    "template-curly-spacing": ["error", "never"],
+    "yield-star-spacing": ["error", "after"]
+  }
+}

.jshintrc

@@ -5,7 +5,7 @@
 
 # Chai Assertions for Promises
 
-**Chai as Promised** extends [Chai][chai] with a fluent language for asserting facts about [promises][presentation].
+**Chai as Promised** extends [Chai](http://chaijs.com/) with a fluent language for asserting facts about [promises](http://www.slideshare.net/domenicdenicola/callbacks-promises-and-coroutines-oh-my-the-evolution-of-asynchronicity-in-javascript).
 
 Instead of manually wiring up your expectations to a promise's fulfilled and rejected handlers:
 
@@ -90,7 +90,7 @@ return assert.isRejected(promise, /error message matcher/, "optional message");
 
 ### Progress Callbacks
 
-Chai as Promised does not have any intrinsic support for testing promise progress callbacks. The properties you would want to test are probably much better suited to a library like [Sinon.JS][sinon], perhaps in conjunction with [Sinon–Chai][sinon-chai]:
+Chai as Promised does not have any intrinsic support for testing promise progress callbacks. The properties you would want to test are probably much better suited to a library like [Sinon.JS](http://sinonjs.org/), perhaps in conjunction with [Sinon–Chai](https://github.com/domenic/sinon-chai):
 
 ```javascript
 var progressSpy = sinon.spy();
@@ -144,15 +144,15 @@ Promise.resolve(2).should.eventually.be.within(Promise.resolve(1), Promise.resol
 
 ### Compatibility
 
-Chai as Promised is compatible with all promises following the [Promises/A+ specification][spec].
+Chai as Promised is compatible with all promises following the [Promises/A+ specification](http://promisesaplus.com/).
 
-Notably, jQuery's promises were not up to spec before jQuery 3.0, and Chai as Promised will not work with them. In particular, Chai as Promised makes extensive use of the standard [transformation behavior][] of `then`, which jQuery<3.0 does not support.
+Notably, jQuery's promises were not up to spec before jQuery 3.0, and Chai as Promised will not work with them. In particular, Chai as Promised makes extensive use of the standard [transformation behavior](http://domenic.me/2012/10/14/youre-missing-the-point-of-promises/#toc_2) of `then`, which jQuery<3.0 does not support.
 
 Angular promises have a special digest cycle for their processing, and [need extra setup code to work with Chai as Promised](http://stackoverflow.com/a/37374041/3191).
 
 ### Working with Non-Promise–Friendly Test Runners
 
-Some test runners (e.g. Jasmine, QUnit, or tap/tape) do not have the ability to use the returned promise to signal asynchronous test completion. If possible, I'd recommend switching to ones that do, such as [Mocha][mocha-promises], [Buster][buster-promises], or [blue-tape][]. But if that's not an option, Chai as Promised still has you covered. As long as your test framework takes a callback indicating when the asynchronous test run is over, Chai as Promised can adapt to that situation with its `notify` method, like so:
+Some test runners (e.g. Jasmine, QUnit, or tap/tape) do not have the ability to use the returned promise to signal asynchronous test completion. If possible, I'd recommend switching to ones that do, such as [Mocha](http://mochajs.org/#asynchronous-code), [Buster](http://docs.busterjs.org/en/latest/modules/buster-test/spec/#returning-a-promise), or [blue-tape](https://github.com/spion/blue-tape). But if that's not an option, Chai as Promised still has you covered. As long as your test framework takes a callback indicating when the asynchronous test run is over, Chai as Promised can adapt to that situation with its `notify` method, like so:
 
 ```javascript
 it("should be fulfilled", function (done) {
@@ -216,32 +216,16 @@ chai.should();
 // according to your preference of assertion style
 ```
 
-You can of course put this code in a common test fixture file; for an example using [Mocha][], see [the Chai as Promised tests themselves][fixturedemo].
+You can of course put this code in a common test fixture file; for an example using [Mocha](http://mochajs.org), see [the Chai as Promised tests themselves](https://github.com/domenic/chai-as-promised/tree/master/test/).
 
 ### In the Browser
 
-To use Chai as Promised in environments that don't support Node.js-like CommonJS modules, you'll need to use a bundling tool like [browserify][].
+To use Chai as Promised in environments that don't support Node.js-like CommonJS modules, you'll need to use a bundling tool like [browserify](http://browserify.org/). See also the note below about browser compatibility.
 
 ### Karma
 
-If you're using [Karma][], check out the accompanying [karma-chai-as-promised][] plugin.
-
-### Browser Compatibility
-
-Chai as Promised is only compatible with modern browsers (IE ≥9, Safari ≥6, no PhantomJS).
-
-[presentation]: http://www.slideshare.net/domenicdenicola/callbacks-promises-and-coroutines-oh-my-the-evolution-of-asynchronicity-in-javascript
-[chai]: http://chaijs.com/
-[Mocha-promises]: http://mochajs.org/#asynchronous-code
-[Buster-promises]: http://docs.busterjs.org/en/latest/modules/buster-test/spec/#returning-a-promise
-[blue-tape]: https://github.com/spion/blue-tape
-[spec]: http://promisesaplus.com/
-[transformation behavior]: http://domenic.me/2012/10/14/youre-missing-the-point-of-promises/#toc_2
-[Mocha]: http://mochajs.org
-[fixturedemo]: https://github.com/domenic/chai-as-promised/tree/master/test/
-[amd]: https://github.com/amdjs/amdjs-api/wiki/AMD
-[sinon]: http://sinonjs.org/
-[sinon-chai]: https://github.com/domenic/sinon-chai
-[Karma]: https://karma-runner.github.io/
-[karma-chai-as-promised]: https://github.com/vlkosinov/karma-chai-as-promised
-[browserify]: http://browserify.org/
+If you're using [Karma](https://karma-runner.github.io/), check out the accompanying [karma-chai-as-promised](https://github.com/vlkosinov/karma-chai-as-promised) plugin.
+
+### Browser/Node Compatibility
+
+Chai as Promised requires Node v4+ or a browser with equivalent support for modern JavaScript syntax. If your browser doesn't support modern JavaScript syntax, you'll need to transpile it down using a tool like [Babel](http://babeljs.io/).