---
title: .flowconfig [untyped]
slug: /config/untyped
---

The `[untyped]` section in a `.flowconfig` file tells Flow to not typecheck files
matching the specified regular expressions and instead throw away types and treat modules as [`any`](../../types/any).

This is different from the [`[ignore]`](../ignore) config section that causes matching files to be ignored by the module resolver,
which inherently makes them un-typechecked, and also unresolvable by `import` or `require`.
When ignored, [`[libs]`](../libs) must then be specified for each `import` using `flow-typed`, which may not always be desired.

It is also different from the [`[declarations]`](../declarations) section.
This also does not typecheck the file contents, but `[declarations]` does extract and use the signatures of functions, classes, etc, when checking other code.

`[untyped]` instead causes a file to be ignored by the typechecker as if it had `@noflow` in it,
resolve modules as `any` type, but allow them to NOT be ignored by the module resolver.
Any matching file is skipped by Flow (not even parsed, like other `@noflow` files!), but can still be `require()`'d.

Things to keep in mind:

1.  These are [OCaml regular expressions](http://caml.inria.fr/pub/docs/manual-ocaml/libref/Str.html#TYPEregexp).
2.  These regular expressions match against absolute paths. They probably should
    start with `.*`

An example `[untyped]` section might look like:

```
[untyped]
.*/third_party/.*
.*/src/\(foo\|bar\)/.*
.*\.untyped\.js
```

This `[untyped]` section will parse:

1.  Any file or directory under a directory named `third_party`
2.  Any file or directory under `.*/src/foo` or under `.*/src/bar`
3.  Any file that ends with the extension `.untyped.js`

You may use the `<PROJECT_ROOT>` placeholder in your regular expressions.
At runtime, Flow will treat the placeholder as if it were the absolute path
to the project's root directory. This is useful for writing regular
expressions that are relative rather than absolute.

For example, you can write:

```
[untyped]
<PROJECT_ROOT>/third_party/.*
```

Which would parse in declaration mode any file or directory under the directory
named `third_party/` within the project root. However, unlike the previous
example's `.*/third_party/.*`, it would NOT parse files or directories under
directories named `third_party/`, like `src/third_party/`.