transform_code

Apply multiple JavaScript/TypeScript code transformations in one operation, such as renaming, replacing, or inserting code, for efficient refactoring or migration workflows. Preview changes before applying.

Instructions

Apply multiple transformations in a single operation. Most powerful tool for complex refactoring workflows.

Examples: • API refactor: [{type: 'rename', parameters: {oldName: 'getData', newName: 'fetchData'}}, {type: 'removeUnusedImports'}] • Environment update: [{type: 'replaceIn', parameters: {nodeType: 'string', pattern: /localhost/g, replacement: 'api.production.com'}}, {type: 'removeUnusedImports'}] • Add logging: [{type: 'insertAfter', parameters: {pattern: 'function_declaration', text: 'console.log("Function called");'}}, {type: 'removeUnusedImports'}] • Bulk rename: [{type: 'rename', parameters: {oldName: 'user', newName: 'customer'}}, {type: 'rename', parameters: {oldName: 'id', newName: 'customerId'}}] • Legacy migration: [{type: 'replaceIn', parameters: {nodeType: 'call_expression', pattern: /XMLHttpRequest/g, replacement: 'fetch'}}, {type: 'removeUnusedImports'}]

Input Schema

Name	Required	Description	Default
`operations`	Yes	Array of transformation operations applied in sequence. Use preview:true first!
`preview`	No	Return preview only without applying changes (default: false). ALWAYS preview complex transformations first.

Input Schema (JSON Schema)

{
  "properties": {
    "operations": {
      "description": "Array of transformation operations applied in sequence. Use preview:true first!",
      "items": {
        "properties": {
          "parameters": {
            "description": "Parameters: rename{oldName,newName}, replaceIn{nodeType,pattern,replacement}, insert{pattern,text}",
            "type": "object"
          },
          "type": {
            "enum": [
              "rename",
              "removeUnusedImports",
              "replaceIn",
              "insertBefore",
              "insertAfter"
            ],
            "type": "string"
          }
        },
        "required": [
          "type"
        ],
        "type": "object"
      },
      "type": "array"
    },
    "preview": {
      "description": "Return preview only without applying changes (default: false). ALWAYS preview complex transformations first.",
      "type": "boolean"
    }
  },
  "required": [
    "operations"
  ],
  "type": "object"
}

Tree-Hugger-JS MCP Server

transform_code

Instructions

Input Schema

Input Schema (JSON Schema)

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