chore: support eslint flat config

fix: support output CLI option

fix: remove condition mistake of CLI option

fix: convert anyOf to union type

Merge branch 'pr'

Merge pull request #219 from aspida/develop

chore: release v0.21.0

Merge pull request #216 from aspida/develop

chore: add minimist to devDependencies

Merge pull request #187 from LumaKernel/main

feat: add "or undefined" explicitly to support exactOptionalPropertyTypes

Merge pull request #185 from LumaKernel/revert-atmark

revert: replaceLeadingAtMark of PR #146

Merge pull request #166 from aspida/develop

chore(release): 0.17.0