envExpansion.ts

services/mcp/envExpansion.ts

integrations mcp

Lines

1047

Bytes

Exports

Imports

Keywords

What this is

This page documents one file from the repository and includes its full source so you can read it without leaving the docs site.

Beginner explanation

This file is one piece of the larger system. Its name, directory, imports, and exports show where it fits. Start by reading the exports and related files first.

How it is used

Start from the exports list and related files. Those are the easiest clues for where this file fits into the system.

Expert explanation

Architecturally, this file intersects with integrations, mcp. It contains 39 lines, 0 detected imports, and 1 detected exports.

Important relationships

Detected exports

expandEnvVarsInString

Keywords

expandedmissingvarsvariablesvarnamedefaultvalueenvvalueenvironmentmissingmatchvarcontent

Detected imports

No import paths detected.

Source notes

This page embeds the full file contents. Small or leaf files are still indexed honestly instead of being over-explained.

Open parent directory

Full source

/**
 * 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,
  }
}