test.mjs

// Save test.mjs in the root of the repository, and run it as `node test.mjs`
import {fromMarkdown} from 'mdast-util-from-markdown'
import {
  gfmAutolinkLiteralFromMarkdown,
  gfmAutolinkLiteralToMarkdown
} from './lib/index.js'

const hundredA = 'a'.repeat(100)
const fileWithBreaks = `${hundredA}\n`.repeat(800)
const fileWithoutBreaks = `${hundredA}`.repeat(800)

// On my computer: parsing a file with breaks: 32.809ms
console.time('parsing a file with breaks')
fromMarkdown(fileWithBreaks, {
  extensions: [],
  mdastExtensions: [gfmAutolinkLiteralFromMarkdown()]
})
console.timeEnd('parsing a file with breaks')

// On my computer: parsing a file without breaks: 10.127s
console.time('parsing a file without breaks')
fromMarkdown(fileWithoutBreaks, {
  extensions: [],
  mdastExtensions: [gfmAutolinkLiteralFromMarkdown()]
})
console.timeEnd('parsing a file without breaks')