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diff --git a/node_modules/@11ty/eleventy/src/Util/ProjectDirectories.js b/node_modules/@11ty/eleventy/src/Util/ProjectDirectories.js
new file mode 100644
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--- /dev/null
+++ b/node_modules/@11ty/eleventy/src/Util/ProjectDirectories.js
@@ -0,0 +1,369 @@
+import fs from "node:fs";
+import path from "node:path";
+import { TemplatePath } from "@11ty/eleventy-utils";
+import { isDynamicPattern } from "tinyglobby";
+
+import DirContains from "./DirContains.js";
+
+/* Directories internally should always use *nix forward slashes */
+class ProjectDirectories {
+	static defaults = {
+		input: "./",
+		data: "./_data/", // Relative to input directory
+		includes: "./_includes/", // Relative to input directory
+		layouts: "./_layouts/", // Relative to input directory
+		output: "./_site/",
+	};
+
+	// no updates allowed, input/output set via CLI
+	#frozen = false;
+
+	#raw = {};
+
+	#dirs = {};
+
+	inputFile = undefined;
+	inputGlob = undefined;
+
+	// Add leading dot slash
+	// Use forward slashes
+	static normalizePath(fileOrDir) {
+		return TemplatePath.standardizeFilePath(fileOrDir);
+	}
+
+	// Must be a directory
+	// Always include a trailing slash
+	static normalizeDirectory(dir) {
+		return this.addTrailingSlash(this.normalizePath(dir));
+	}
+
+	normalizeDirectoryPathRelativeToInputDirectory(filePath) {
+		return ProjectDirectories.normalizeDirectory(path.join(this.input, filePath));
+	}
+
+	static addTrailingSlash(path) {
+		if (path.slice(-1) === "/") {
+			return path;
+		}
+		return path + "/";
+	}
+
+	// If input/output are set via CLI, they take precedence over all other configuration values.
+	freeze() {
+		this.#frozen = true;
+	}
+
+	setViaConfigObject(configDirs = {}) {
+		// input must come last
+		let inputChanged = false;
+		if (
+			configDirs.input &&
+			ProjectDirectories.normalizeDirectory(configDirs.input) !== this.input
+		) {
+			this.#setInputRaw(configDirs.input);
+			inputChanged = true;
+		}
+
+		// If falsy or an empty string, the current directory is used.
+		if (configDirs.output !== undefined) {
+			if (ProjectDirectories.normalizeDirectory(configDirs.output) !== this.output) {
+				this.setOutput(configDirs.output);
+			}
+		}
+
+		// Input relative directory, if falsy or an empty string, inputDir is used!
+		// Always set if input changed, e.g. input is `src` and data is `../_data` (resulting in `./_data`) we still want to set data to this new value
+		if (configDirs.data !== undefined) {
+			if (
+				inputChanged ||
+				this.normalizeDirectoryPathRelativeToInputDirectory(configDirs.data || "") !== this.data
+			) {
+				this.setData(configDirs.data);
+			}
+		}
+
+		// Input relative directory, if falsy or an empty string, inputDir is used!
+		if (configDirs.includes !== undefined) {
+			if (
+				inputChanged ||
+				this.normalizeDirectoryPathRelativeToInputDirectory(configDirs.includes || "") !==
+					this.includes
+			) {
+				this.setIncludes(configDirs.includes);
+			}
+		}
+
+		// Input relative directory, if falsy or an empty string, inputDir is used!
+		if (configDirs.layouts !== undefined) {
+			if (
+				inputChanged ||
+				this.normalizeDirectoryPathRelativeToInputDirectory(configDirs.layouts || "") !==
+					this.layouts
+			) {
+				this.setLayouts(configDirs.layouts);
+			}
+		}
+
+		if (inputChanged) {
+			this.updateInputDependencies();
+		}
+	}
+
+	updateInputDependencies() {
+		// raw first, fall back to Eleventy defaults if not yet set
+		this.setData(this.#raw.data ?? ProjectDirectories.defaults.data);
+		this.setIncludes(this.#raw.includes ?? ProjectDirectories.defaults.includes);
+
+		// Should not include this if not explicitly opted-in
+		if (this.#raw.layouts !== undefined) {
+			this.setLayouts(this.#raw.layouts ?? ProjectDirectories.defaults.layouts);
+		}
+	}
+
+	/* Relative to project root, must exist */
+	#setInputRaw(dirOrFile, inputDir = undefined) {
+		// is frozen and was defined previously
+		if (this.#frozen && this.#raw.input !== undefined) {
+			return;
+		}
+
+		this.#raw.input = dirOrFile;
+
+		if (!dirOrFile) {
+			// input must exist if inputDir is not set.
+			return;
+		}
+
+		// Normalize absolute paths to relative, #3805
+		// if(path.isAbsolute(dirOrFile)) {
+		// 	dirOrFile = path.relative(".", dirOrFile);
+		// }
+
+		// Input has to exist (assumed glob if it does not exist)
+		let inputExists = fs.existsSync(dirOrFile);
+		let inputExistsAndIsDirectory = inputExists && fs.statSync(dirOrFile).isDirectory();
+
+		if (inputExistsAndIsDirectory) {
+			// is not a file or glob
+			this.#dirs.input = ProjectDirectories.normalizeDirectory(dirOrFile);
+		} else {
+			if (inputExists) {
+				this.inputFile = ProjectDirectories.normalizePath(dirOrFile);
+			} else {
+				if (!isDynamicPattern(dirOrFile)) {
+					throw new Error(
+						`The "${dirOrFile}" \`input\` parameter (directory or file path) must exist on the file system (unless detected as a glob by the \`tinyglobby\` package)`,
+					);
+				}
+
+				this.inputGlob = dirOrFile;
+			}
+
+			// Explicit Eleventy option for inputDir
+			if (inputDir) {
+				// Changed in 3.0: must exist
+				if (!fs.existsSync(inputDir)) {
+					throw new Error("Directory must exist (via inputDir option to Eleventy constructor).");
+				}
+
+				this.#dirs.input = ProjectDirectories.normalizeDirectory(inputDir);
+			} else {
+				// the input directory is implied to be the parent directory of the
+				// file, unless inputDir is explicitly specified (via Eleventy constructor `options`)
+				this.#dirs.input = ProjectDirectories.normalizeDirectory(
+					TemplatePath.getDirFromFilePath(dirOrFile), // works with globs
+				);
+			}
+		}
+	}
+
+	setInput(dirOrFile, inputDir = undefined) {
+		this.#setInputRaw(dirOrFile, inputDir); // does not update
+		this.updateInputDependencies();
+	}
+
+	/* Relative to input dir */
+	setIncludes(dir) {
+		if (dir !== undefined) {
+			// falsy or an empty string is valid (falls back to input dir)
+			this.#raw.includes = dir;
+			this.#dirs.includes = ProjectDirectories.normalizeDirectory(
+				TemplatePath.join(this.input, dir || ""),
+			);
+		}
+	}
+
+	/* Relative to input dir */
+	/* Optional */
+	setLayouts(dir) {
+		if (dir !== undefined) {
+			// falsy or an empty string is valid (falls back to input dir)
+			this.#raw.layouts = dir;
+			this.#dirs.layouts = ProjectDirectories.normalizeDirectory(
+				TemplatePath.join(this.input, dir || ""),
+			);
+		}
+	}
+
+	/* Relative to input dir */
+	setData(dir) {
+		if (dir !== undefined) {
+			// falsy or an empty string is valid (falls back to input dir)
+			// TODO must exist if specified
+			this.#raw.data = dir;
+			this.#dirs.data = ProjectDirectories.normalizeDirectory(
+				TemplatePath.join(this.input, dir || ""),
+			);
+		}
+	}
+
+	/* Relative to project root */
+	setOutput(dir) {
+		// is frozen and was defined previously
+		if (this.#frozen && this.#raw.output !== undefined) {
+			return;
+		}
+
+		if (dir !== undefined) {
+			this.#raw.output = dir;
+			this.#dirs.output = ProjectDirectories.normalizeDirectory(dir || "");
+		}
+	}
+
+	get input() {
+		return this.#dirs.input || ProjectDirectories.defaults.input;
+	}
+
+	get data() {
+		return this.#dirs.data || ProjectDirectories.defaults.data;
+	}
+
+	get includes() {
+		return this.#dirs.includes || ProjectDirectories.defaults.includes;
+	}
+
+	get layouts() {
+		// explicit opt-in, no fallback.
+		return this.#dirs.layouts;
+	}
+
+	get output() {
+		return this.#dirs.output || ProjectDirectories.defaults.output;
+	}
+
+	isTemplateFile(filePath) {
+		let inputPath = this.getInputPath(filePath);
+		// TODO use DirContains
+		if (this.layouts && inputPath.startsWith(this.layouts)) {
+			return false;
+		}
+
+		// if this.includes is "" (and thus is the same directory as this.input)
+		// we don’t actually know if this is a template file, so defer
+		if (this.includes && this.includes !== this.input) {
+			if (inputPath.startsWith(this.includes)) {
+				return false;
+			}
+		}
+
+		// TODO use DirContains
+		return inputPath.startsWith(this.input);
+	}
+
+	// for a hypothetical template file
+	getInputPath(filePathRelativeToInputDir) {
+		// TODO change ~/ to project root dir
+		return TemplatePath.addLeadingDotSlash(
+			TemplatePath.join(this.input, TemplatePath.standardizeFilePath(filePathRelativeToInputDir)),
+		);
+	}
+
+	// Inverse of getInputPath
+	// Removes input dir from path
+	getInputPathRelativeToInputDirectory(filePathRelativeToInputDir) {
+		let inputDir = TemplatePath.addLeadingDotSlash(TemplatePath.join(this.input));
+
+		// No leading dot slash
+		return TemplatePath.stripLeadingSubPath(filePathRelativeToInputDir, inputDir);
+	}
+
+	// for a hypothetical Eleventy layout file
+	getLayoutPath(filePathRelativeToLayoutDir) {
+		return TemplatePath.addLeadingDotSlash(
+			TemplatePath.join(
+				this.layouts || this.includes,
+				TemplatePath.standardizeFilePath(filePathRelativeToLayoutDir),
+			),
+		);
+	}
+
+	// Removes layout dir from path
+	getLayoutPathRelativeToInputDirectory(filePathRelativeToLayoutDir) {
+		let layoutPath = this.getLayoutPath(filePathRelativeToLayoutDir);
+		let inputDir = TemplatePath.addLeadingDotSlash(TemplatePath.join(this.input));
+
+		// No leading dot slash
+		return TemplatePath.stripLeadingSubPath(layoutPath, inputDir);
+	}
+
+	getProjectPath(filePath) {
+		return TemplatePath.addLeadingDotSlash(
+			TemplatePath.join(".", TemplatePath.standardizeFilePath(filePath)),
+		);
+	}
+
+	isFileInProjectFolder(filePath) {
+		return DirContains(TemplatePath.getWorkingDir(), filePath);
+	}
+
+	isFileInOutputFolder(filePath) {
+		return DirContains(this.output, filePath);
+	}
+
+	static getRelativeTo(targetPath, cwd) {
+		return path.relative(cwd, path.join(path.resolve("."), targetPath));
+	}
+
+	// Access the data without being able to set the data.
+	getUserspaceInstance() {
+		let d = this;
+
+		return {
+			get input() {
+				return d.input;
+			},
+			get inputFile() {
+				return d.inputFile;
+			},
+			get inputGlob() {
+				return d.inputGlob;
+			},
+			get data() {
+				return d.data;
+			},
+			get includes() {
+				return d.includes;
+			},
+			get layouts() {
+				return d.layouts;
+			},
+			get output() {
+				return d.output;
+			},
+		};
+	}
+
+	toString() {
+		return {
+			input: this.input,
+			inputFile: this.inputFile,
+			inputGlob: this.inputGlob,
+			data: this.data,
+			includes: this.includes,
+			layouts: this.layouts,
+			output: this.output,
+		};
+	}
+}
+
+export default ProjectDirectories;