PHPStan

.editorconfig

@@ -7,3 +7,6 @@ indent_size = 4
 indent_style = space
 insert_final_newline = true
 trim_trailing_whitespace = true
+
+[*.neon]
+indent_style = tab

.github/workflows/ci.yml

@@ -61,17 +61,13 @@ jobs:
       - name: Set up locales
         run: ./hack/setup-locales.sh
 
-      - name: Remove Psalm when on PHP 8.4
-        if: ${{ matrix.php == '8.4' }}
-        run: composer remove --dev psalm/plugin-phpunit vimeo/psalm
-
       - uses: "ramsey/composer-install@v3"
 
       - name: Run tests
         run: vendor/bin/phpunit
 
-  psalm:
-    name: Psalm
+  phpstan:
+    name: PHPStan
     runs-on: ubuntu-latest
 
     steps:
@@ -81,13 +77,13 @@ jobs:
       - name: Set up PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '8.3'
+          php-version: '8.4'
           extensions: bcmath, gmp, intl, dom, mbstring
 
       - uses: "ramsey/composer-install@v3"
 
-      - name: Psalm
-        run: vendor/bin/psalm
+      - name: PHPStan
+        run: vendor/bin/phpstan
 
   docs:
     name: Docs

composer.json

@@ -37,15 +37,17 @@
         "doctrine/instantiator": "^1.5.0 || ^2.0",
         "florianv/exchanger": "^2.8.1",
         "florianv/swap": "^4.3.0",
-        "moneyphp/iso-currencies": "^3.4",
         "moneyphp/crypto-currencies": "^1.1.0",
+        "moneyphp/iso-currencies": "^3.4",
         "php-http/message": "^1.16.0",
         "php-http/mock-client": "^1.6.0",
         "phpbench/phpbench": "^1.2.5",
+        "phpstan/extension-installer": "^1.4",
+        "phpstan/phpstan": "^2.0",
+        "phpstan/phpstan-phpunit": "^2.0",
         "phpunit/phpunit": "^10.5.9",
-        "psalm/plugin-phpunit": "^0.18.4",
         "psr/cache": "^1.0.1 || ^2.0 || ^3.0",
-        "vimeo/psalm": "~5.20.0"
+        "ticketswap/phpstan-error-formatter": "^1.1"
     },
     "suggest": {
         "ext-gmp": "Calculate without integer limits",
@@ -73,7 +75,8 @@
             "dealerdirect/phpcodesniffer-composer-installer": true,
             "ergebnis/composer-normalize": true,
             "infection/extension-installer": true,
-            "php-http/discovery": false
+            "php-http/discovery": false,
+            "phpstan/extension-installer": true
         },
         "sort-packages": true
     },

phpstan.neon

@@ -0,0 +1,14 @@
+parameters:
+	level: 4
+	paths:
+		- src
+		- tests
+	errorFormat: ticketswap
+	editorUrl: 'phpstorm://open?file=%%file%%&line=%%line%%'
+	ignoreErrors:
+		-
+			identifier: staticMethod.alreadyNarrowedType
+			path: tests/*
+		-
+			identifier: method.alreadyNarrowedType
+			path: tests/*

src/Calculator.php

@@ -21,132 +21,132 @@ interface Calculator
      * Retrieves a positive value if $a > $b.
      * Retrieves zero if $a == $b
      *
-     * @psalm-param numeric-string $a
-     * @psalm-param numeric-string $b
+     * @phpstan-param numeric-string $a
+     * @phpstan-param numeric-string $b
      *
-     * @psalm-pure
+     * @phpstan-pure
      */
     public static function compare(string $a, string $b): int;
 
     /**
      * Add added to amount.
      *
-     * @psalm-param numeric-string $amount
-     * @psalm-param numeric-string $addend
+     * @phpstan-param numeric-string $amount
+     * @phpstan-param numeric-string $addend
      *
-     * @psalm-return numeric-string
+     * @phpstan-return numeric-string
      *
-     * @psalm-pure
+     * @phpstan-pure
      */
     public static function add(string $amount, string $addend): string;
 
     /**
      * Subtract subtrahend from amount.
      *
-     * @psalm-param numeric-string $amount
-     * @psalm-param numeric-string $subtrahend
+     * @phpstan-param numeric-string $amount
+     * @phpstan-param numeric-string $subtrahend
      *
-     * @psalm-return numeric-string
+     * @phpstan-return numeric-string
      *
-     * @psalm-pure
+     * @phpstan-pure
      */
     public static function subtract(string $amount, string $subtrahend): string;
 
     /**
      * Multiply amount with multiplier.
      *
-     * @psalm-param numeric-string $amount
-     * @psalm-param numeric-string $multiplier
+     * @phpstan-param numeric-string $amount
+     * @phpstan-param numeric-string $multiplier
      *
-     * @psalm-return numeric-string
+     * @phpstan-return numeric-string
      *
-     * @psalm-pure
+     * @phpstan-pure
      */
     public static function multiply(string $amount, string $multiplier): string;
 
     /**
      * Divide amount with divisor.
      *
-     * @psalm-param numeric-string $amount
-     * @psalm-param numeric-string $divisor
+     * @phpstan-param numeric-string $amount
+     * @phpstan-param numeric-string $divisor
      *
-     * @psalm-return numeric-string
+     * @phpstan-return numeric-string
      *
      * @throws InvalidArgumentException when $divisor is zero.
      *
-     * @psalm-pure
+     * @phpstan-pure
      */
     public static function divide(string $amount, string $divisor): string;
 
     /**
      * Round number to following integer.
      *
-     * @psalm-param numeric-string $number
+     * @phpstan-param numeric-string $number
      *
-     * @psalm-return numeric-string
+     * @phpstan-return numeric-string
      *
-     * @psalm-pure
+     * @phpstan-pure
      */
     public static function ceil(string $number): string;
 
     /**
      * Round number to preceding integer.
      *
-     * @psalm-param numeric-string $number
+     * @phpstan-param numeric-string $number
      *
-     * @psalm-return numeric-string
+     * @phpstan-return numeric-string
      *
-     * @psalm-pure
+     * @phpstan-pure
      */
     public static function floor(string $number): string;
 
     /**
      * Returns the absolute value of the number.
      *
-     * @psalm-param numeric-string $number
+     * @phpstan-param numeric-string $number
      *
-     * @psalm-return numeric-string
+     * @phpstan-return numeric-string
      *
-     * @psalm-pure
+     * @phpstan-pure
      */
     public static function absolute(string $number): string;
 
     /**
      * Round number, use rounding mode for tie-breaker.
      *
-     * @psalm-param numeric-string $number
-     * @psalm-param Money::ROUND_* $roundingMode
+     * @phpstan-param numeric-string $number
+     * @phpstan-param Money::ROUND_* $roundingMode
      *
-     * @psalm-return numeric-string
+     * @phpstan-return numeric-string
      *
-     * @psalm-pure
+     * @phpstan-pure
      */
     public static function round(string $number, int $roundingMode): string;
 
     /**
      * Share amount among ratio / total portions.
      *
-     * @psalm-param numeric-string $amount
-     * @psalm-param numeric-string $ratio
-     * @psalm-param numeric-string $total
+     * @phpstan-param numeric-string $amount
+     * @phpstan-param numeric-string $ratio
+     * @phpstan-param numeric-string $total
      *
-     * @psalm-return numeric-string
+     * @phpstan-return numeric-string
      *
-     * @psalm-pure
+     * @phpstan-pure
      */
     public static function share(string $amount, string $ratio, string $total): string;
 
     /**
      * Get the modulus of an amount.
      *
-     * @psalm-param numeric-string $amount
-     * @psalm-param numeric-string $divisor
+     * @phpstan-param numeric-string $amount
+     * @phpstan-param numeric-string $divisor
      *
-     * @psalm-return numeric-string
+     * @phpstan-return numeric-string
      *
      * @throws InvalidArgumentException when $divisor is zero.
      *
-     * @psalm-pure
+     * @phpstan-pure
      */
     public static function mod(string $amount, string $divisor): string;
 }