Merge package:fixnum into the core monorepo

pkgs/fixnum/.github/dependabot.yml

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+# Dependabot configuration file.
+# See https://docs.github.com/en/code-security/dependabot/dependabot-version-updates
+version: 2
+
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: monthly
+    labels:
+      - autosubmit
+    groups:
+      github-actions:
+        patterns:
+          - "*"

pkgs/fixnum/.github/workflows/publish.yaml

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+# A CI configuration to auto-publish pub packages.
+
+name: Publish
+
+on:
+  pull_request:
+    branches: [ master ]
+  push:
+    tags: [ 'v[0-9]+.[0-9]+.[0-9]+*' ]
+
+jobs:
+  publish:
+    if: ${{ github.repository_owner == 'dart-lang' }}
+    uses: dart-lang/ecosystem/.github/workflows/publish.yaml@main

pkgs/fixnum/.github/workflows/test-package.yml

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+name: Dart CI
+
+on:
+  # Run on PRs and pushes to the default branch.
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+  schedule:
+    - cron: "0 0 * * 0"
+
+env:
+  PUB_ENVIRONMENT: bot.github
+
+jobs:
+  # Check code formatting and static analysis on a single OS (linux)
+  # against Dart dev.
+  analyze:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        sdk: [3.1.0, dev]
+    steps:
+      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938
+      - uses: dart-lang/setup-dart@0a8a0fc875eb934c15d08629302413c671d3f672
+        with:
+          sdk: ${{ matrix.sdk }}
+      - id: install
+        name: Install dependencies
+        run: dart pub get
+      - name: Check formatting
+        run: dart format --output=none --set-exit-if-changed .
+        if: always() && steps.install.outcome == 'success'
+      - name: Analyze code
+        run: dart analyze --fatal-infos
+        if: always() && steps.install.outcome == 'success'
+
+  # Run tests on a matrix consisting of two dimensions:
+  # 1. OS: ubuntu-latest, (macos-latest, windows-latest)
+  # 2. release channel: dev
+  test:
+    needs: analyze
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        # Add macos-latest and/or windows-latest if relevant for this package.
+        os: [ubuntu-latest]
+        sdk: [3.1.0, dev]
+    steps:
+      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938
+      - uses: dart-lang/setup-dart@0a8a0fc875eb934c15d08629302413c671d3f672
+        with:
+          sdk: ${{ matrix.sdk }}
+      - id: install
+        name: Install dependencies
+        run: dart pub get
+      - name: Run VM tests
+        run: dart test --platform vm
+        if: always() && steps.install.outcome == 'success'
+      - name: Run Chrome tests
+        run: dart test --platform chrome
+        if: always() && steps.install.outcome == 'success'

pkgs/fixnum/.gitignore

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+.dart_tool/
+.packages
+pubspec.lock

pkgs/fixnum/AUTHORS

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+# Names should be added to this file with this pattern:
+#
+# For individuals:
+#   Name <email address>
+#
+# For organizations:
+#   Organization <fnmatch pattern>
+#
+Google Inc. <*@google.com>

pkgs/fixnum/CHANGELOG.md

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+## 1.1.1-wip
+
+* Require Dart `^3.1.0`
+
+## 1.1.0
+
+* Add `tryParseRadix`, `tryParseInt` and `tryParseHex` static methods
+  to both `Int32` and `Int64`.
+* Document exception and overflow behavior of parse functions,
+  and of `toHexString`.
+* Make `Int32` parse functions consistent with documentation (accept
+  leading minus sign, do not accept empty inputs).
+* Update the minimum SDK constraint to 2.19.
+* Update to package:lints 2.0.0.
+
+## 1.0.1
+
+* Switch to using `package:lints`.
+* Populate the pubspec `repository` field.
+
+## 1.0.0
+
+* Stable null safety release.
+
+## 1.0.0-nullsafety.0
+
+* Migrate to null safety.
+  * This is meant to be mostly non-breaking, for opted in users runtime errors
+    will be promoted to static errors. For non-opted in users the runtime
+    errors are still present in their original form.
+
+## 0.10.11
+
+* Update minimum SDK constraint to version 2.1.1.
+
+## 0.10.10
+
+* Fix `Int64` parsing to throw `FormatException` on an empty string or single
+  minus sign. Previous incorrect behaviour was to throw a `RangeError` or
+  silently return zero.
+
+## 0.10.9
+
+* Add `Int64.toStringUnsigned()` and `Int64.toRadixStringUnsigned()` functions.
+
+## 0.10.8
+
+* Set SDK version constraint to `>=2.0.0-dev.65 <3.0.0`.
+
+## 0.10.7
+
+* Bug fix: Make bit shifts work at bitwidth boundaries. Previously,
+  `new Int64(3) << 64 == Int64(3)`. This ensures that the result is 0 in such
+  cases.
+* Updated maximum SDK constraint from 2.0.0-dev.infinity to 2.0.0.
+
+## 0.10.6
+
+* Fix `Int64([int value])` constructor to avoid rounding error on intermediate
+  results for large negative inputs when compiled to JavaScript. `new
+  Int64(-1000000000000000000)` used to produce the same value as
+  `Int64.parseInt("-1000000000000000001")`
+
+## 0.10.5
+
+* Fix strong mode warning in overridden `compareTo()` methods.
+
+*No changelog entries for previous versions...*

pkgs/fixnum/CONTRIBUTING.md

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+# How to contribute
+
+### Sign our Contributor License Agreement (CLA)
+
+Even for small changes, we ask that you please sign the CLA electronically
+[here](https://developers.google.com/open-source/cla/individual).
+The CLA is necessary because you own the copyright to your changes, even
+after your contribution becomes part of our codebase, so we need your permission
+to use and distribute your code. You can find more details
+[here](https://code.google.com/p/dart/wiki/Contributing).

pkgs/fixnum/LICENSE

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+Copyright 2014, the Dart project authors.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+    * Neither the name of Google LLC nor the names of its
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

pkgs/fixnum/README.md

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+[![Dart CI](https://github.com/dart-lang/fixnum/actions/workflows/test-package.yml/badge.svg)](https://github.com/dart-lang/fixnum/actions/workflows/test-package.yml)
+[![Pub](https://img.shields.io/pub/v/fixnum.svg)](https://pub.dev/packages/fixnum)
+[![package publisher](https://img.shields.io/pub/publisher/fixnum.svg)](https://pub.dev/packages/fixnum/publisher)
+
+A fixed-width 32- and 64- bit integer library for Dart.
+
+Provides data types for signed 32- and 64-bit integers.
+The integer implementations in this library are designed to work identically
+whether executed on the Dart VM or compiled to JavaScript.
+
+## Publishing automation
+
+For information about our publishing automation and release process, see
+https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.

pkgs/fixnum/analysis_options.yaml

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+include: package:dart_flutter_team_lints/analysis_options.yaml
+
+analyzer:
+  language:
+    strict-casts: true
+
+linter:
+  rules:
+    - avoid_private_typedef_functions
+    - avoid_unused_constructor_parameters
+    - cancel_subscriptions
+    - cascade_invocations
+    - join_return_with_assignment
+    - missing_whitespace_between_adjacent_strings
+    - no_adjacent_strings_in_list
+    - no_runtimeType_toString
+    - package_api_docs
+    - prefer_const_declarations
+    - prefer_expression_function_bodies
+    - unnecessary_raw_strings
+    - use_string_buffers

pkgs/fixnum/lib/fixnum.dart

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+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// Signed 32- and 64-bit integer support.
+///
+/// The integer implementations in this library are designed to work
+/// identically whether executed on the Dart VM or compiled to JavaScript.
+library;
+
+export 'src/int32.dart';
+export 'src/int64.dart';
+export 'src/intx.dart';