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Natours/starter/node_modules/nan/tools/README.md

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+1to2 naively converts source code files from NAN 1 to NAN 2. There will be erroneous conversions,
+false positives and missed opportunities. The input files are rewritten in place. Make sure that
+you have backups. You will have to manually review the changes afterwards and do some touchups.
+
+```sh
+$ tools/1to2.js
+
+  Usage: 1to2 [options] <file ...>
+
+  Options:
+
+    -h, --help     output usage information
+    -V, --version  output the version number
+```