default-options.js

// Export a new default each time
export default () => ({
    /* Inline Javascript - @plugin still allowed */
    javascriptEnabled: false,

    /* Outputs a makefile import dependency list to stdout. */
    depends: false,

    /* (DEPRECATED) Compress using less built-in compression. 
    * This does an okay job but does not utilise all the tricks of 
    * dedicated css compression. */
    compress: false,

    /* Runs the less parser and just reports errors without any output. */
    lint: false,

    /* Sets available include paths.
    * If the file in an @import rule does not exist at that exact location, 
    * less will look for it at the location(s) passed to this option. 
    * You might use this for instance to specify a path to a library which 
    * you want to be referenced simply and relatively in the less files. */
    paths: [],

    /* color output in the terminal */
    color: true,

    /* The strictImports controls whether the compiler will allow an @import inside of either 
    * @media blocks or (a later addition) other selector blocks.
    * See: https://github.com/less/less.js/issues/656 */
    strictImports: false,

    /* Allow Imports from Insecure HTTPS Hosts */
    insecure: false,

    /* Allows you to add a path to every generated import and url in your css. 
    * This does not affect less import statements that are processed, just ones 
    * that are left in the output css. */
    rootpath: '',

    /* By default URLs are kept as-is, so if you import a file in a sub-directory 
    * that references an image, exactly the same URL will be output in the css. 
    * This option allows you to re-write URL's in imported files so that the 
    * URL is always relative to the base imported file */
    rewriteUrls: false,

    /* How to process math 
    *   0 always           - eagerly try to solve all operations
    *   1 parens-division  - require parens for division "/"
    *   2 parens | strict  - require parens for all operations
    *   3 strict-legacy    - legacy strict behavior (super-strict)
    */
    math: 1,

    /* Without this option, less attempts to guess at the output unit when it does maths. */
    strictUnits: false,

    /* Effectively the declaration is put at the top of your base Less file, 
    * meaning it can be used but it also can be overridden if this variable 
    * is defined in the file. */
    globalVars: null,

    /* As opposed to the global variable option, this puts the declaration at the
    * end of your base file, meaning it will override anything defined in your Less file. */
    modifyVars: null,

    /* This option allows you to specify a argument to go on to every URL.  */
    urlArgs: ''
});