lbundle/dist/utils/get-filename-output-format.mjs

Small zero-configuration bundler build on top of Rollup.js and SWC for NPM libraries

import path from 'path';

const getFilenameOutputFormat = function(filename) {
    let isModule = arguments.length > 1 && arguments[1] !== void 0 ? arguments[1] : false;
    const ext = path.extname(filename);
    filename.substring;
    switch(ext){
        case '.mjs':
            return 'esm';
        case '.cjs':
            return 'cjs';
    }
    const filenameWithoutExt = filename.substring(0, filename.length - ext.length);
    const luxuryExt = path.extname(filenameWithoutExt);
    if (!luxuryExt) {
        return isModule ? 'esm' : 'cjs';
    }
    switch(luxuryExt){
        case '.umd':
            return 'umd';
        case '.amd':
            return 'amd';
        case '.iife':
            return 'iife';
    }
    throw new Error('[lbundle] unknown output format for filename: ' + filename);
};

export { getFilenameOutputFormat };
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