const path = require('path');
// took from d3/package.json
const d3Pkgs = [
    'd3',
    'd3-array',
    'd3-axis',
    'd3-brush',
    'd3-chord',
    'd3-color',
    'd3-contour',
    'd3-delaunay',
    'd3-dispatch',
    'd3-drag',
    'd3-dsv',
    'd3-ease',
    'd3-fetch',
    'd3-force',
    'd3-format',
    'd3-geo',
    'd3-hierarchy',
    'd3-interpolate',
    'd3-path',
    'd3-polygon',
    'd3-quadtree',
    'd3-random',
    'd3-scale',
    'd3-scale-chromatic',
    'd3-selection',
    'd3-shape',
    'd3-time',
    'd3-time-format',
    'd3-timer',
    'd3-transition',
    'd3-zoom',
];

// option 1 map module to an bundled version of the package which is es5
const moduleNameMapper = d3Pkgs.reduce((acc, pkg) => {
    acc[`^${pkg}$`] = path.join(require.resolve(pkg), `../../dist/${pkg}.min.js`);
    return acc;
}, {});

module.exports = {
    moduleNameMapper: {
        // option 1
        // ...moduleNameMapper
    },
    transform: {
        // match mjs js jsx ts tsx
        '^.+\\.m?[jt]sx?$': 'babel-jest',
    },
    // stop ignore node_modules transform since d3 and others start to put es6 as main of packages
    transformIgnorePatterns: [
        // option 2, stop ignore transform on es6 packages
        `/node_modules/(?!${d3Pkgs.join('|')}|internmap|d3-delaunay|delaunator|robust-predicates)`,
        // option 3, stop ignore transform on all node_modules
        // `/node_modules/(?!.*)`,
    ],
};