fix(dateTime)!: correctly works with timezones, utc offsets and DST (#41

)

- rewritten internal date-maths
- corrected DateTime's public API types

Breaking changes:
- work with UTC the same as with other timezones, in case if input date does not contain timezone information

```js
guessUserTimeZone() == 'Europe/Moscow';
 // Before
dateTime({input: '2023-12-31', timeZone: 'UTC') == '2023-12-31T00:00Z'
// After
dateTime({input: '2023-12-31', timeZone: 'UTC') == '2023-12-30T21:00Z'
```

.eslintignore

@@ -0,0 +1 @@
+build

.eslintrc

@@ -1,5 +1,9 @@
 {
-    "extends": ["@gravity-ui/eslint-config", "@gravity-ui/eslint-config/prettier"],
+    "extends": [
+        "@gravity-ui/eslint-config",
+        "@gravity-ui/eslint-config/import-order",
+        "@gravity-ui/eslint-config/prettier"
+    ],
     "root": true,
     "env": {
         "node": true,

.github/workflows/ci.yml

@@ -2,23 +2,22 @@ name: CI
 
 on:
   push:
-    branches: [main]
+    branches: [main, next]
   pull_request:
-    branches: [main]
 
 jobs:
   verify_files:
     name: Verify Files
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           fetch-depth: 0
       - name: Setup Node
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v3
         with:
-          node-version: '14.x'
+          node-version: 18
           cache: 'npm'
       - name: Install Packages
         run: npm ci
@@ -32,13 +31,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           fetch-depth: 0
       - name: Setup Node
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v3
         with:
-          node-version: '14.x'
+          node-version: 18
           cache: 'npm'
       - name: Install Packages
         run: npm ci

.github/workflows/release.yml

@@ -12,4 +12,4 @@ jobs:
         with:
           github-token: ${{ secrets.GRAVITY_UI_BOT_GITHUB_TOKEN }}
           npm-token: ${{ secrets.GRAVITY_UI_BOT_NPM_TOKEN }}
-          node-version: 14
+          node-version: 18

.husky/commit-msg

@@ -1,4 +1,4 @@
-#!/bin/sh
-. "$(dirname "$0")/_/husky.sh"
+#!/usr/bin/env sh
+. "$(dirname -- "$0")/_/husky.sh"
 
 npx commitlint -e

.husky/pre-commit

@@ -1,4 +1,4 @@
-#!/bin/sh
-. "$(dirname "$0")/_/husky.sh"
+#!/usr/bin/env sh
+. "$(dirname -- "$0")/_/husky.sh"
 
-./node_modules/.bin/nano-staged
+npx nano-staged

.nvm

@@ -0,0 +1 @@
+18

.prettierignore

@@ -1 +1,4 @@
-build
+build
+package-lock.json
+CHANGELOG.md
+CONTRIBUTING.md

jest.config.js

@@ -1,7 +1,8 @@
+/** @type {import('ts-jest').JestConfigWithTsJest} */
 module.exports = {
     roots: ['<rootDir>/src'],
     transform: {
-        '^.+\\.ts$': 'ts-jest',
+        '^.+\\.ts$': ['ts-jest', {tsconfig: {verbatimModuleSyntax: false}}],
     },
     setupFilesAfterEnv: ['<rootDir>/setup-tests.ts'],
 };