Function handler

packages/tooling/src/vite.plugin.transform.ts:34–60

(code, id)

        transform: {
            filter: { id: /\.tsx?$/ },
            handler(code, id) {
                if (!code.includes('ElementStyleHelper')) {
                    return null;
                }

                const program = parseAst(
                    code,
                    { lang: id.endsWith('.tsx') ? 'tsx' : 'ts', sourceType: 'module' },
                    id
                );

                const ms = new MagicString(code);
                walk(program, node => {
                    if (node.type === 'BlockStatement' || node.type === 'Program') {
                        rewriteBody((node as BlockStatement | Program).body as Statement[], ms);
                    }
                });

                if (!ms.hasChanged()) {
                    return null;
                }

                return {
                    code: ms.toString(),
                    map: ms.generateMap({ hires: 'boundary', source: id })
                };
            }
        }
    };
}