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+# `dependency-tree`
+
+Returns an unordered array of local paths to dependencies of a CommonJS node JavaScript file (everything it or any of its dependencies `require`s).
+
+* See also: [`dependency-tree-esm`](https://github.com/11ty/eleventy-dependency-tree-esm) for ES Modules.
+
+Reduced feature (faster) alternative to the [`dependency-tree` package](https://www.npmjs.com/package/dependency-tree). This is used by Eleventy to find dependencies of a JavaScript file to watch for changes to re-run Eleventy’s build.
+
+## Big Huge Caveat
+
+⚠ A big caveat to this plugin is that it will require the file in order to build a dependency tree. So if your module has side effects and you don’t want it to execute—do not use this!
+
+## Installation
+
+```
+npm install --save-dev @11ty/dependency-tree
+```
+
+## Features
+
+* Ignores `node_modules`
+* Or, use `nodeModuleNames` to control whether or not `node_modules` package names are included (added in v2.0.1)
+* Ignores Node’s built-ins (e.g. `path`)
+* Handles circular dependencies (Node does this too)
+
+## Usage
+
+```js
+// my-file.js
+
+// if my-local-dependency.js has dependencies, it will include those too
+const test = require("./my-local-dependency.js");
+
+// ignored, is a built-in
+const path = require("path");
+```
+
+```js
+const DependencyTree = require("@11ty/dependency-tree");
+
+DependencyTree("./my-file.js");
+// returns ["./my-local-dependency.js"]
+```
+
+### `allowNotFound`
+
+```js
+const DependencyTree = require("@11ty/dependency-tree");
+
+DependencyTree("./this-does-not-exist.js"); // throws an error
+
+DependencyTree("./this-does-not-exist.js", { allowNotFound: true });
+// returns []
+```
+
+### `nodeModuleNames`
+
+(Added in v2.0.1) Controls whether or not node package names are included in the list of dependencies.
+
+* `nodeModuleNames: "include"`: included alongside the local JS files.
+* `nodeModuleNames: "exclude"` (default): node module package names are excluded.
+* `nodeModuleNames: "only"`: only node module package names are returned.
+
+```js
+// my-file.js:
+
+require("./my-local-dependency.js");
+require("@11ty/eleventy");
+```
+
+```js
+const DependencyTree = require("@11ty/dependency-tree");
+
+DependencyTree("./my-file.js");
+// returns ["./my-local-dependency.js"]
+
+DependencyTree("./my-file.js", { nodeModuleNames: "exclude" });
+// returns ["./my-local-dependency.js"]
+
+DependencyTree("./my-file.js", { nodeModuleNames: "include" });
+// returns ["./my-local-dependency.js", "@11ty/eleventy"]
+
+DependencyTree("./my-file.js", { nodeModuleNames: "only" });
+// returns ["@11ty/eleventy"]
+```
+
+#### (Deprecated) `nodeModuleNamesOnly`
+
+(Added in v2.0.0) Changed to use `nodeModuleNames` option instead. Backwards compatibility is maintained automatically.
+
+* `nodeModuleNamesOnly: false` is mapped to `nodeModuleNames: "exclude"`
+* `nodeModuleNamesOnly: true` is mapped to `nodeModuleNames: "only"`
+
+If both `nodeModuleNamesOnly` and `nodeModuleNames` are included in options, `nodeModuleNames` takes precedence.