vue-cli/docs/dev-guide/generator-api.md

# Generator API

## resolve

- **Arguments**
  - `{string} _path` - relative path from project root

- **Returns**
  - `{string}`- the resolved absolute path

- **Usage**:
Resolve a path for the current project

## hasPlugin

- **Arguments**
  - `{string} id` - plugin id, can omit the (@vue/|vue-|@scope/vue)-cli-plugin- prefix

- **Returns**
  - `{boolean}`

- **Usage**:
Check if the project has a plugin with given id

## addConfigTransform

- **Arguments**
  - `{string} key` - config key in package.json
  - `{object} options` - options
  - `{object} options.file` - file descriptor. Used to search for existing file. Each key is a file type (possible values: ['js', 'json', 'yaml', 'lines']). The value is a list of filenames.
  Example:
  ```js
  {
    js: ['.eslintrc.js'],
    json: ['.eslintrc.json', '.eslintrc']
  }
  ```
  By default, the first filename will be used to create the config file.

- **Returns**
  - `{boolean}`

- **Usage**:
Configure how config files are extracted.

## extendPackage

- **Arguments**
  - `{object | () => object} fields` - fields to merge

- **Usage**:
Extend the `package.json` of the project. Nested fields are deep-merged unless `{ merge: false }` is passed. Also resolves dependency conflicts between plugins. Tool configuration fields may be extracted into standalone files before files are written to disk.

## render

- **Arguments**
  - `{string | object | FileMiddleware} source` - can be one of
    - relative path to a directory;
    - object hash of `{ sourceTemplate: targetFile }` mappings;
    - a custom file middleware function
  - `{object} [additionalData]` - additional data available to templates
  - `{object} [ejsOptions]` - options for ejs

- **Usage**:
Render template files into the virtual files tree object.

## postProcessFiles

- **Arguments**
  - `{FileMiddleware} cb` - file middleware

- **Usage**:
Push a file middleware that will be applied after all normal file middlewares have been applied.

## onCreateComplete

- **Arguments**
  - `{function} cb`

- **Usage**:
Push a callback to be called when the files have been written to disk.

## exitLog

- **Arguments**
  - `{} msg` - string or value to print after the generation is completed;
  - `{('log'|'info'|'done'|'warn'|'error')} [type='log']` - type of the message.

- **Usage**:
Add a message to be printed when the generator exits (after any other standard messages).

## genJSConfig

- **Arguments**
  - `{any} value`

- **Usage**:
Convenience method for generating a JS config file from JSON

## injectImports

- **Arguments**
  - `{string} file` - target file to add imports
  - `{string | [string]} imports` - imports string/array

- **Usage**:
Add import statements to a file.

## injectRootOptions

- **Arguments**
  - `{string} file` - target file to add options
  - `{string | [string]} options` - options string/array

- **Usage**:
Add options to the root Vue instance (detected by `new Vue`).

## entryFile

- **Returns**
  - `{('src/main.ts'|'src/main.js')}`

- **Usage**:
Get the entry file taking into account typescript.

## invoking

- **Returns**
  - `{boolean}`

- **Usage**:
Checks if the plugin is being invoked.