devtools

• Type: object with the properties below
• Optional
• Experimental

Defined in: packages/rolldown/src/options/input-options.ts:787

Devtools integration options.

When enabled, Rolldown writes JSON-lines devtools output under node_modules/.rolldown/{session_id}/, resolved against cwd. Consumers can parse the output with @rolldown/debug after await bundle.close() resolves.

sessionId replaces the generated session id. It must be one path segment: not empty, not . or .., and without /, \ or NUL. Rolldown does not check that it is unique: give each bundler that runs at the same time its own sessionId, or their devtools output mixes. The name unknown-session is reserved regardless of case.

sessionId?

• Type: string
• Optional