init claude-code

services/mcp/envExpansion.ts

@@ -0,0 +1,38 @@
+/**
+ * Shared utilities for expanding environment variables in MCP server configurations
+ */
+
+/**
+ * Expand environment variables in a string value
+ * Handles ${VAR} and ${VAR:-default} syntax
+ * @returns Object with expanded string and list of missing variables
+ */
+export function expandEnvVarsInString(value: string): {
+  expanded: string
+  missingVars: string[]
+} {
+  const missingVars: string[] = []
+
+  const expanded = value.replace(/\$\{([^}]+)\}/g, (match, varContent) => {
+    // Split on :- to support default values (limit to 2 parts to preserve :- in defaults)
+    const [varName, defaultValue] = varContent.split(':-', 2)
+    const envValue = process.env[varName]
+
+    if (envValue !== undefined) {
+      return envValue
+    }
+    if (defaultValue !== undefined) {
+      return defaultValue
+    }
+
+    // Track missing variable for error reporting
+    missingVars.push(varName)
+    // Return original if not found (allows debugging but will be reported as error)
+    return match
+  })
+
+  return {
+    expanded,
+    missingVars,
+  }
+}