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doc: how to expose primordials when using --expose-internals #38026

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doc: how to expose primordials when using --expose-internals #38026

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9 changes: 9 additions & 0 deletions doc/guides/writing-tests.md
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Expand Up @@ -286,6 +286,15 @@ const assert = require('assert');
const freelist = require('internal/freelist');
```

In specific scenarios it may be useful to get a hold of `primordials` or
`internalBinding()`. You can do so using
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`internalBinding()`. You can do so using
`internalBinding()`. You can do so using:


```console
node --expose-internals -r internal/test/binding lib/fs.js
```

This only works if you preload `internal/test/binding` by command line flag.

### Assertions

When writing assertions, prefer the strict versions:
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