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doc: document subpath-pattern precedence and null blocking in exports #64413

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9 changes: 9 additions & 0 deletions doc/api/packages.md
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Expand Up @@ -655,6 +655,15 @@ import featureX from 'es-module-package/features/x.js';
// Loads ./node_modules/es-module-package/src/features/x.js
```

When a subpath matches more than one pattern, the pattern with the longest
matching prefix (the most specific pattern) takes precedence, regardless of the
order in which the patterns are declared in the `exports` object.

A `null` target blocks access to the subpaths that would otherwise match its
pattern: requesting such a subpath throws
[`ERR_PACKAGE_PATH_NOT_EXPORTED`][] regardless of where the `null` pattern is
positioned among the keys.

### Conditional exports

<!-- YAML
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