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  "readme": "# node-merge-trees\n\n[![Build Status](https://travis-ci.org/broccolijs/node-merge-trees.svg?branch=master)](https://travis-ci.org/broccolijs/node-merge-trees)\n[![Build status](https://ci.appveyor.com/api/projects/status/6c47hp9omebk09tq/branch/master?svg=true)](https://ci.appveyor.com/project/joliss/node-merge-trees/branch/master)\n\nSymlink or copy multiple trees of files on top of each other, resulting in a single merged tree.\n\nOptimized for repeated (incremental) merging.\n\n## Installation\n\n```bash\nnpm install --save merge-trees\n```\n\n## Usage\n\n* `new MergeTrees(inputPaths, outputPath, options)`:\n\n    * **`inputPaths`**: An array of paths to the input directories\n\n    * **`outputPath`**: The path to the output directory. Must exist and be empty.\n\n    * **`options`**: A hash of options\n\n* `mergeTrees.merge()`: Merge the input directories into the output directory.\n  Can be called repeatedly for efficient incremental merging.\n\n### Options\n\n* `overwrite`: By default, node-merge-trees throws an error when a file\n  exists in multiple nodes. If you pass `{ overwrite: true }`, the output\n  will contain the version of the file as it exists in the last input\n  directory that contains it.\n\n* `annotation`: A note to help with logging.\n\n### Example\n\n```js\nvar MergeTrees = require('merge-trees');\n\nvar mergeTrees = new MergeTrees(\n  ['public', 'scripts'],\n  'output-dir',\n  { overwrite: true });\n\n// Recursively symlink all files from the \"public\" and \"scripts\"\n// directories into the \"output-dir\" directory.\nmergeTrees.merge()\n\n// ... add or remove files or directories in some input directories ...\n\n// Incrementally update the output directory (efficient).\nmergeTrees.merge()\n```\n\nSay the directory structure is as follows:\n\n    .\n    ├─ public\n    │  ├─ index.html\n    │  └─ images\n    │     └─ logo.png\n    ├─ scripts\n    │  └─ app.js\n    ├─ output-dir\n    …\n\nRunning `mergeTrees.merge()` will generate this folder:\n\n    .\n    ├─ …\n    └─ output-dir\n       ├─ app.js\n       ├─ index.html\n       └─ images\n          └─ logo.png\n\nThe parent folders, `public` and `scripts` in this case, are not included in the output. The output tree contains only the files *within* each folder, all mixed together.\n\n## Contributing\n\nClone this repo and run the tests like so:\n\n```\nnpm install\nnpm test\n```\n\nIssues and pull requests are welcome. If you change code, be sure to re-run\n`npm test`. Oftentimes it's useful to add or update tests as well.\n",
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