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By default, solanaPortalSource activates a console logger. Passing metrics and progress enables those services. To embed a pipe into external code with no side effects, disable them all: 
import { solanaQuery, solanaPortalStream } from '@subsquid/pipes/solana'

const stream = solanaPortalStream({
  portal: 'https://portal.sqd.dev/datasets/solana-mainnet',
  outputs: solanaQuery()
    .addFields({ block: { number: true, timestamp: true } })
    .includeAllBlocks()
    .build(),
  logger: false,   // disable all log output
  profiler: false, // profiler disabled under all circumstances
  // omit `metrics` — no metrics server
  // omit `progress` — no progress reporting
})

for await (const { data } of stream) {
  // data is Block[]
  console.log(data.length)
}
The source becomes a plain async iterable that yields { data, ctx } per batch. ctx.logger is a no-op when logger: false.