The site is no longer being updated and the site is being taken down at the end of March 2023. See post here: ESM Checker Postmortem.
This will show the last month of stats on how ES Module adoption is progressing on a day-to-day basis. This keeps track of approximately 2000 popular NPM packages which can be explored in the Package Listing page on this site.
Exports No Require
type_module: A module that explicitly set the type for the package to "module" which will treat all .js files as ESM by default.
exports_require: A module that has an "exports" field that explicitly has a "require" field which allows a module to be required with a CJS fallback.
exports_no_require: A module that has an "exports" field that does not have a "require" field, so it may not have a CJS fallback.