Cannot load metadata from ESM package

[timdp]

Bug Description

utils.loadModuleData() is defeated b yESM packages.

Code snippets

{
  "name": "depcheck-test",
  "version": "0.0.0",
  "private": true,
  "scripts": {
    "test": "depcheck .",
    "foo": "miniflare baz"
  },
  "dependencies": {
    "depcheck": "^1.4.3",
    "miniflare": "^2.9.0"
  }
}

This crashes the require.resolve('.../package.json') call in loadModuleData with:

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './package.json' is not defined by "exports" in /Users/timdp/Code/depcheck-test/node_modules/miniflare/package.json
    at new NodeError (node:internal/errors:393:5)
    at throwExportsNotFound (node:internal/modules/esm/resolve:340:9)
    at packageExportsResolve (node:internal/modules/esm/resolve:619:3)
    at resolveExports (node:internal/modules/cjs/loader:492:36)
    at Module._findPath (node:internal/modules/cjs/loader:532:31)
    at Module._resolveFilename (node:internal/modules/cjs/loader:941:27)
    at Function.resolve (node:internal/modules/cjs/helpers:109:19)
    at loadModuleData (/Users/timdp/Code/depcheck-test/node_modules/depcheck/dist/utils/index.js:48:26)
    at getCacheOrLoad (/Users/timdp/Code/depcheck-test/node_modules/depcheck/dist/special/bin.js:22:48)
    at getBinaries (/Users/timdp/Code/depcheck-test/node_modules/depcheck/dist/special/bin.js:31:23) {
  code: 'ERR_PACKAGE_PATH_NOT_EXPORTED'
}

because Miniflare uses ESM exports in package.json, which require.resolve() respects.

Theoretically, Miniflare could export package.json explicitly, but there's no need for that. I would recommend using read-pkg instead of require.resolve() + require().

Versions

• node -v: v18.8.0
• npm -v: 8.18.0
• depcheck --version: 1.4.3

[dword-design]

I created a PR that fixes it #760.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.