Class DebugObserver

Formats parse events as an indented call tree and writes each line to a sink.

Defaults to writing to console.error. Pass a custom sink to redirect output:

const lines: string[] = []
const obs = new DebugObserver(line => lines.push(line))
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Output example:

→ expr  pos:0
  → term  pos:0
  ← term  matched  pos:1
← expr  matched  pos:1
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