chore: add missing executors in some tests

chore: fix `PushFileFunction` type parameter names

fix: don't add a sep if path contains any kind of sep at end

fix: use explicit types for FS interface

chore: do not suppress errors in tests

chore: bump version to 6.5.0

chore: update lockfile

chore: set engines field (#159)

build: set up tsdown for dual build (#147)

fix: support `@types/picomatch` v4

fix: use `||` instead of `??` for node 12 compat

chore: run format

feat: support custom fs

test: minor refactor

fix: drop AbortController as it breaks fdir on Node v14