Upgrade deps (#973)

.eslintrc.cjs

@@ -0,0 +1,25 @@
+module.exports = {
+  extends: ["eslint:recommended", "plugin:@typescript-eslint/recommended"],
+  parser: "@typescript-eslint/parser",
+  plugins: ["@typescript-eslint"],
+  root: true,
+
+  rules: {
+    "@typescript-eslint/no-unused-vars": [
+      "warn",
+      // Unused variables are fine if they start with an underscore
+      { args: "all", argsIgnorePattern: "^_.*", varsIgnorePattern: "^_.*" },
+    ],
+  },
+
+  overrides: [
+    {
+      files: ["test/**"],
+
+      // Special config for test files
+      rules: {
+        "@typescript-eslint/no-non-null-assertion": "off",
+      },
+    },
+  ],
+};

.github/workflows/test.yml

@@ -9,11 +9,10 @@ jobs:
       matrix:
         node-version: [
             # From https://github.com/nodejs/Release
-            '12.x', # EoL 2022-04-30
-            '14.x', # EoL 2023-04-30
-            '16.x', # EoL 2023-09-11
-            '18.x', # EoL 2025-04-30
-            'latest', # EoL 2026-04-30
+            "16.x", # EoL 2023-09-11
+            "18.x", # EoL 2025-04-30
+            "20.x", # EoL 2026-04-30
+            "latest",
           ]
 
     steps:

.prettierrc

@@ -1,12 +1,3 @@
 {
-    "printWidth": 120,
-    "tabWidth": 4,
-    "singleQuote": true,
-
-    "overrides": [
-        {
-            "files": "*.yml",
-            "options": { "tabWidth": 2 }
-        }
-    ]
+  "printWidth": 120
 }

CHANGELOG.md

@@ -1,27 +1,33 @@
+## v2.2.0
+
+- Move to ESM by default
+- Drop support for node 12.x and 14.x  
+  (they probably still work, but they're EoL)
+
 ## v2.1.2
 
--   Improve tree-shakability when used in bundlers
+- Improve tree-shakability when used in bundlers
 
 ## v2.1.1
 
--   Improve documentation
--   Fix a bug in `reduce()` in a very small edge case
+- Improve documentation
+- Fix a bug in `reduce()` in a very small edge case
 
 ## v2.1.0
 
 The following functions retain richer type information about their arguments:
 
--   `ifilter()`
--   `filter()`
--   `partition()`
+- `ifilter()`
+- `filter()`
+- `partition()`
 
 For example, TypeScript will now know the following:
 
 ```ts
-const items = [3, 'hi', -7, 'foo', 13];
+const items = [3, "hi", -7, "foo", 13];
 
 function isNum(value: unknown): value is number {
-    return typeof value === 'number';
+  return typeof value === "number";
 }
 
 const numbers: number[] = filter(items, isNum); // ✅
@@ -31,25 +37,25 @@ const [numbers, strings] = partition(items, isNum); // ✅
 //     number[]
 ```
 
--   Add new `find(iterable, pred)` function, which is almost the same as
-    `first(iterable, pred)` but behaves slightly more intuitive in the case
-    where no predicate function is given.
+- Add new `find(iterable, pred)` function, which is almost the same as
+  `first(iterable, pred)` but behaves slightly more intuitive in the case
+  where no predicate function is given.
 
--   Fix bug in `chunked()` with `size=1`
+- Fix bug in `chunked()` with `size=1`
 
 ## v2.0.0
 
 **Breaking changes:**
 
--   Rewritten source code in TypeScript (instead of Flow)
--   Modern ESM and CJS dual exports (fully tree-shakable when using ESM)
--   Massively [reduced bundle size](https://bundlephobia.com/package/itertools@2.0.0)
--   Targeted ES2015 (instead of ES5)
--   Support only TypeScript versions >= 4.3
--   Drop Flow support\*
--   Drop Node 10.x support
--   `icompact`, `compact`, and `compactObject` functions will now also remove
-    `null` values, not only `undefined`
+- Rewritten source code in TypeScript (instead of Flow)
+- Modern ESM and CJS dual exports (fully tree-shakable when using ESM)
+- Massively [reduced bundle size](https://bundlephobia.com/package/itertools@2.0.0)
+- Targeted ES2015 (instead of ES5)
+- Support only TypeScript versions >= 4.3
+- Drop Flow support\*
+- Drop Node 10.x support
+- `icompact`, `compact`, and `compactObject` functions will now also remove
+  `null` values, not only `undefined`
 
 (\*: I'm still open to bundling Flow types within this package, but only if
 that can be supported in a maintenance-free way, for example by using a script
@@ -58,97 +64,97 @@ add support for that, I'm open to pull requests! 🙏 )
 
 ## v1.7.1
 
--   Add missing re-export of `islice` at the top level
+- Add missing re-export of `islice` at the top level
 
 ## v1.7.0
 
--   TypeScript support!
--   Declare official support for Node 16.x
--   Drop support for Node 13.x (unstable release)
+- TypeScript support!
+- Declare official support for Node 16.x
+- Drop support for Node 13.x (unstable release)
 
 ## v1.6.1
 
--   Include an error code with every FlowFixMe suppression
-    (Flow 0.132.x compatibility)
+- Include an error code with every FlowFixMe suppression
+  (Flow 0.132.x compatibility)
 
 ## v1.6.0
 
--   New itertool: `heads()`
+- New itertool: `heads()`
 
 ## v1.5.4
 
--   Export `roundrobin()` at the top level
+- Export `roundrobin()` at the top level
 
 ## v1.5.3
 
--   Fix bug in `chunked()` when input is exactly dividable
+- Fix bug in `chunked()` when input is exactly dividable
 
 ## v1.5.2
 
--   Export `count()` function at the top level 🤦‍♂️
+- Export `count()` function at the top level 🤦‍♂️
 
 ## v1.5.1
 
--   Internal change to make the code Flow 0.105.x compatible. Basically stops
-    using array spreads (`[...things]`) in favor of `Array.from()`.
+- Internal change to make the code Flow 0.105.x compatible. Basically stops
+  using array spreads (`[...things]`) in favor of `Array.from()`.
 
 ## v1.5.0
 
--   Remove direct code dependency on `regenerator-runtime` (let `@babel/runtime`
-    manage it)
+- Remove direct code dependency on `regenerator-runtime` (let `@babel/runtime`
+  manage it)
 
 ## v1.4.0
 
--   Switch to Babel 7
+- Switch to Babel 7
 
 ## v1.3.2
 
--   Export `filter` at the top level
+- Export `filter` at the top level
 
 ## v1.3.1
 
--   New build system
--   Cleaner NPM package contents
+- New build system
+- Cleaner NPM package contents
 
 ## v1.3.0
 
--   Drop support for Node 7
+- Drop support for Node 7
 
 ## v1.2.2
 
--   Make itertools.js fully [Flow Strict](https://flow.org/en/docs/strict/)
+- Make itertools.js fully [Flow Strict](https://flow.org/en/docs/strict/)
 
 ## v1.2.1
 
--   Export `permutations()` at the top-level
+- Export `permutations()` at the top-level
 
 ## v1.2.0
 
--   Add port of `groupby()` function (see #87, thanks @sgenoud!)
+- Add port of `groupby()` function (see #87, thanks @sgenoud!)
 
 ## v1.1.6
 
--   declare library to be side effect free (to help optimize webpack v4 builds)
+- declare library to be side effect free (to help optimize webpack v4 builds)
 
 ## v1.1.5
 
--   Include regenerator runtime via babel-runtime
+- Include regenerator runtime via babel-runtime
 
 ## v1.1.4
 
--   Make `regenerator-runtime` a normal runtime dependency
+- Make `regenerator-runtime` a normal runtime dependency
 
 ## v1.1.3
 
--   Lower required version of `regenerator-runtime`
+- Lower required version of `regenerator-runtime`
 
 ## v1.1.2
 
--   Properly declare dependency on `regenerator-runtime`
+- Properly declare dependency on `regenerator-runtime`
 
 ## v1.1.1
 
--   Fix bug in `cycle()` with infinite inputs
+- Fix bug in `cycle()` with infinite inputs
 
 ## v1.1.0