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// certain assertions we should do only when testing arborist itself, because
// they are too expensive or aggressive and would break user programs if we
// miss a situation where they are actually valid.
//
// call like this:
//
// /* istanbul ignore next - debug check */
// debug(() => {
//   if (someExpensiveCheck)
//     throw new Error('expensive check should have returned false')
// })

// run in debug mode if explicitly requested, running arborist tests,
// or working in the arborist project directory.

const debug = process.env.ARBORIST_DEBUG !== '0' && (
  process.env.ARBORIST_DEBUG === '1' ||
  /\barborist\b/.test(process.env.NODE_DEBUG || '') ||
  process.env.npm_package_name === '@npmcli/arborist' &&
  ['test', 'snap'].includes(process.env.npm_lifecycle_event) ||
  process.cwd() === require('path').resolve(__dirname, '..')
)

module.exports = debug ? fn => fn() : () => {}
const red = process.stderr.isTTY ? msg => `\x1B[31m${msg}\x1B[39m` : m => m
module.exports.log = (...msg) => module.exports(() => {
  const { format } = require('util')
  const prefix = `\n${process.pid} ${red(format(msg.shift()))} `
  msg = (prefix + format(...msg).trim().split('\n').join(prefix)).trim()
  console.error(msg)
})