react-native-paper/lib/module/babel/index.js

const SKIP = Symbol('SKIP');

module.exports = function rewire(babel, options) {
  const t = babel.types;

  const {
    name,
    index,
    mappings
  } = require(options.mappings || '../../mappings.json');

  return {
    visitor: {
      ImportDeclaration(path) {
        if (path.node.source.value !== name || path.node[SKIP]) {
          return;
        }

        path.node.source.value = `${name}/${index}`;
        path.replaceWithMultiple(path.node.specifiers.reduce((declarations, specifier) => {
          const mapping = mappings[specifier.imported.name];

          if (mapping) {
            const alias = `${name}/${mapping.path}`;
            const identifier = t.identifier(specifier.local.name);
            let s;

            switch (mapping.name) {
              case 'default':
                s = t.importDefaultSpecifier(identifier);
                break;

              case '*':
                s = t.importNamespaceSpecifier(identifier);
                break;

              default:
                s = t.importSpecifier(identifier, t.identifier(mapping.name));
            }

            declarations.push(t.importDeclaration([s], t.stringLiteral(alias)));
          } else {
            const previous = declarations.find(d => d.source.value === path.node.source.value);

            if (previous) {
              previous.specifiers.push(specifier);
            } else {
              const node = t.importDeclaration([specifier], path.node.source);
              node[SKIP] = true;
              declarations.push(node);
            }
          }

          return declarations;
        }, []));
        path.requeue();
      }

    }
  };
};
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