Update to Psalm 4

Author: sebastianbergmann

.phive/phars.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phive xmlns="https://phar.io/phive">
   <phar name="php-cs-fixer" version="^2.16" installed="2.16.4" location="./tools/php-cs-fixer" copy="true"/>
-  <phar name="psalm" version="^3.8" installed="3.18.2" location="./tools/psalm" copy="true"/>
+  <phar name="psalm" version="^4.0" installed="4.0.1" location="./tools/psalm" copy="true"/>
   <phar name="roave/backwardcompatibilitycheck" version="^5.0.0" installed="5.0.0" location="./tools/roave-backward-compatibility-check" copy="true"/>
 </phive>

.psalm/baseline.xml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<files psalm-version="4.0.1@b1e2e30026936ef8d5bf6a354d1c3959b6231f44">
+  <file src="src/Chunk.php">
+    <DocblockTypeContradiction occurrences="1">
+      <code>$line instanceof Line</code>
+    </DocblockTypeContradiction>
+  </file>
+  <file src="src/Differ.php">
+    <DocblockTypeContradiction occurrences="2">
+      <code>is_array($from)</code>
+      <code>is_array($to)</code>
+    </DocblockTypeContradiction>
+    <MissingParamType occurrences="2">
+      <code>$input</code>
+      <code>$line</code>
+    </MissingParamType>
+    <RedundantConditionGivenDocblockType occurrences="1">
+      <code>null === $outputBuilder</code>
+    </RedundantConditionGivenDocblockType>
+  </file>
+  <file src="src/Exception/ConfigurationException.php">
+    <MissingParamType occurrences="1">
+      <code>$value</code>
+    </MissingParamType>
+  </file>
+  <file src="src/Output/StrictUnifiedDiffOutputBuilder.php">
+    <MissingParamType occurrences="2">
+      <code>$output</code>
+      <code>$output</code>
+    </MissingParamType>
+    <MissingPropertyType occurrences="1">
+      <code>$default</code>
+    </MissingPropertyType>
+    <PropertyNotSetInConstructor occurrences="1">
+      <code>$changed</code>
+    </PropertyNotSetInConstructor>
+  </file>
+  <file src="src/Output/UnifiedDiffOutputBuilder.php">
+    <MissingParamType occurrences="2">
+      <code>$output</code>
+      <code>$output</code>
+    </MissingParamType>
+  </file>
+</files>

.psalm/config.xml

@@ -1,55 +1,17 @@
 <?xml version="1.0"?>
 <psalm
-    totallyTyped="false"
-    cacheDirectory=".psalm/cache"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="https://getpsalm.org/schema/config"
     xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
+    resolveFromConfigFile="false"
+    cacheDirectory=".psalm/cache"
+    totallyTyped="false"
+    errorBaseline=".psalm/baseline.xml"
 >
     <projectFiles>
         <directory name="src" />
         <ignoreFiles>
             <directory name="vendor" />
         </ignoreFiles>
     </projectFiles>
-
-    <issueHandlers>
-        <LessSpecificReturnType errorLevel="info" />
-
-        <!-- level 3 issues - slightly lazy code writing, but provably low false-negatives -->
-
-        <DeprecatedMethod errorLevel="info" />
-        <DeprecatedProperty errorLevel="info" />
-        <DeprecatedClass errorLevel="info" />
-        <DeprecatedConstant errorLevel="info" />
-        <DeprecatedFunction errorLevel="info" />
-        <DeprecatedInterface errorLevel="info" />
-        <DeprecatedTrait errorLevel="info" />
-
-        <InternalMethod errorLevel="info" />
-        <InternalProperty errorLevel="info" />
-        <InternalClass errorLevel="info" />
-
-        <MissingClosureReturnType errorLevel="info" />
-        <MissingReturnType errorLevel="info" />
-        <MissingPropertyType errorLevel="info" />
-        <InvalidDocblock errorLevel="info" />
-        <MisplacedRequiredParam errorLevel="info" />
-
-        <PropertyNotSetInConstructor errorLevel="info" />
-        <MissingConstructor errorLevel="info" />
-        <MissingClosureParamType errorLevel="info" />
-        <MissingParamType errorLevel="info" />
-
-        <RedundantCondition errorLevel="info" />
-
-        <DocblockTypeContradiction errorLevel="info" />
-        <RedundantConditionGivenDocblockType errorLevel="info" />
-
-        <UnresolvableInclude errorLevel="info" />
-
-        <RawObjectIteration errorLevel="info" />
-
-        <InvalidStringClass errorLevel="info" />
-    </issueHandlers>
 </psalm>