Distillation

The distiller compresses annotated DOM into an WciView (JSON) or Markdown for LLM context.

Basic usage

import { WciDistiller } from '@webcontextinterface/distiller';

const distiller = new WciDistiller({
  format: 'json',
  scope: 'registration-form',
  maxNodes: 128,
  includeState: true,
});

const view = distiller.distil(document);
const pretty = distiller.distilJSON(document);
const md = distiller.distilMarkdown(document);

Options (DistillerOptions)

Option	Default	Description
format	'json'	'json' or 'markdown'
scope	undefined	Only nodes in this landmark scope
maxNodes	128	Hard cap after priority sort
siteContext	undefined	SiteContextSummary embedded in view
includeState	true	If false, strips state to save tokens

Pruning (pruneDOM)

Lower-level API without serialization:

import { pruneDOM } from '@webcontextinterface/distiller';

const nodes = pruneDOM(document.getElementById('form-scope')!, {
  scope: 'registration-form',
  maxNodes: 32,
});

Rules:

• Skips subtrees where data-wci-hidden="true"
• Includes nodes with data-wci-id or data-wci-role
• When scope is set, keeps nodes where spec.scope === scope or spec.id === scope
• Sorts by priority ascending (1 first)

JSON vs Markdown

Format	Best for
JSON	Tool-calling models, structured parsing, RAG chunking
Markdown	Chat models, human-readable logs

Token budgeting

1. Set maxNodes to cap list length
2. Set includeState: false if state is large or redundant
3. Use scope to distil one landmark at a time
4. Estimate tokens ≈ characters / 4 (demo uses this heuristic)

See also

• API: distiller
• Specification