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doc: document null target pattern #38724

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doc: document null target pattern
guybedford May 18, 2021
250b212
clarify deep matching
guybedford May 19, 2021
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lint fix
guybedford May 19, 2021
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doc: document null target pattern
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@guybedford
guybedford committed May 18, 2021
commit bbec60473659cafec38fafa3eb883775534f58c8
20 changes: 20 additions & 0 deletions doc/api/packages.md
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Expand Up @@ -383,6 +383,26 @@ treating the right hand side target pattern as a `**` glob against the list of
files within the package. Because `node_modules` paths are forbidden in exports
targets, this expansion is dependent on only the files of the package itself.

To exclude private subfolders from patterns, `null` targets can be used:

```json
// ./node_modules/es-module-package/package.json
{
"exports": {
"./features/*": "./src/features/*.js",
"./features/private-internal/*": null
}
}
```

```js
import featureInternal from 'es-module-package/features/private-internal/m';
// Throws: ERR_PACKAGE_PATH_NOT_EXPORTED

import featureX from 'es-module-package/features/x';
// Loads ./node_modules/es-module-package/src/features/x.js
```

### Subpath folder mappings
<!-- YAML
changes:
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