Function getUsedProps

packages/runner/src/fixture.ts:637–702

(fn: Function, { sourceError, suiteHook }: PropsParserOptions = {})

}

function getUsedProps(fn: Function, { sourceError, suiteHook }: PropsParserOptions = {}): Set<string> {
  if (kPropNamesSymbol in fn) {
    return fn[kPropNamesSymbol] as Set<string>
  }

  const {
    index: fixturesIndex = 0,
    original: implementation = fn,
  } = kPropsSymbol in fn ? fn[kPropsSymbol] as FixturePropsOptions : {}
  let fnString = filterOutComments(implementation.toString())

  // match lowered async function and strip it off
  // example code on esbuild-try https://esbuild.github.io/try/#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
  //   __async(this, null, function*
  //   __async(this, arguments, function*
  //   __async(this, [_0, _1], function*
  if (/__async\((?:this|null), (?:null|arguments|\[[_0-9, ]*\]), function\*/.test(fnString)) {
    fnString = fnString.split(/__async\((?:this|null),/)[1]
  }
  const match = fnString.match(/[^(]*\(([^)]*)/)
  if (!match) {
    return memoProps(fn, new Set())
  }

  const args = splitByComma(match[1])
  if (!args.length) {
    return memoProps(fn, new Set())
  }

  const fixturesArgument = args[fixturesIndex]

  if (!fixturesArgument) {
    return memoProps(fn, new Set())
  }

  if (!(fixturesArgument[0] === '{' && fixturesArgument.endsWith('}'))) {
    const ordinalArgument = ordinal(fixturesIndex + 1)
    const error = new FixtureParseError(
      `The ${ordinalArgument} argument inside a fixture must use object destructuring pattern, e.g. ({ task } => {}). `
      + `Instead, received "${fixturesArgument}".`
      + `${(suiteHook ? ` If you used internal "suite" task as the ${ordinalArgument} argument previously, access it in the ${ordinal(fixturesIndex + 2)} argument instead.` : '')}`,
    )
    if (sourceError) {
      error.stack = sourceError.stack?.replace(sourceError.message, error.message)
    }
    throw error
  }

  const _first = fixturesArgument.slice(1, -1).replace(/\s/g, '')
  const props = splitByComma(_first).map((prop) => {
    return prop.replace(/:.*|=.*/g, '')
  })

  const last = props.at(-1)
  if (last && last.startsWith('...')) {
    const error = new FixtureParseError(
      `Rest parameters are not supported in fixtures, received "${last}".`,
    )