Install psalm as dev, sync scripts updates

vendor/felixfbecker/language-server-protocol/src/MarkupContent.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace LanguageServerProtocol;
+
+/**
+ * A `MarkupContent` literal represents a string value which content is interpreted base on its
+ * kind flag. Currently the protocol supports `plaintext` and `markdown` as markup kinds.
+ *
+ * If the kind is `markdown` then the value can contain fenced code blocks like in GitHub issues.
+ * See https://help.github.com/articles/creating-and-highlighting-code-blocks/#syntax-highlighting
+ *
+ * Here is an example how such a string can be constructed using JavaScript / TypeScript:
+ * ```ts
+ * let markdown: MarkdownContent = {
+ *  kind: MarkupKind.Markdown,
+ *  value: [
+ *      '# Header',
+ *      'Some text',
+ *      '```typescript',
+ *      'someCode();',
+ *      '```'
+ *  ].join('\n')
+ * };
+ * ```
+ *
+ * *Please Note* that clients might sanitize the return markdown. A client could decide to
+ * remove HTML from the markdown to avoid script execution.
+ */
+class MarkupContent
+{
+    /**
+     * @var string the type of the Markup (from MarkupKind)
+     */
+    public $kind;
+
+    /**
+     * @var string the content itself
+     */
+    public $value;
+
+    /**
+     * @param string $kind the type of the Markup
+     * @param string $value the content itself
+     */
+    public function __construct(string $kind = null, string $value = null)
+    {
+        /** @psalm-suppress PossiblyNullPropertyAssignmentValue */
+        $this->kind = $kind;
+        /** @psalm-suppress PossiblyNullPropertyAssignmentValue */
+        $this->value = $value;
+    }
+}