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+# Deno Prototype 2
+
+## Status
+
+This code is a rewrite of the unprivileged parts of Deno. It will soon become
+the root of the project.
+
+There are several goals:
+
+* Use the gn build system for fast builds, sane configuration, and easy
+  linking into Chrome.
+
+* Use V8 snapshots to improve startup time.
+
+* Remove Golang. Although it has been working nicely, I am concerned the
+  double GC will become a problem sometime down the road.
+
+* Distribute a C++ library called libdeno, containing the snapshotted
+  typescript runtime.
+
+* Test the message passing and other functionality at that layer before
+  involving higher level languages.
+
+The contenders for building the unprivileged part of Deno are Rust and C++.
+Thanks to Chrome and gn, using C++ to link into high level libraries is not
+untenable. However, there's a lot of interest in Rust in the JS community and
+it seems like a reasonable choice. TBD.
+
+There are many people exploring the project, so care will be taken to keep the
+original code functional while this is developed. However, once it's ready this
+the code in this deno2/ directory will be moved to the root.
+
+
+## Prerequisites
+
+Get Depot Tools and make sure it's in your path.
+http://commondatastorage.googleapis.com/chrome-infra-docs/flat/depot_tools/docs/html/depot_tools_tutorial.html#_setting_up
+
+For linux you need these prereqs:
+
+    sudo apt-get install libgtk-3-dev pkg-config ccache
+
+
+## Build
+
+First install the javascript deps.
+
+   cd js; yarn install
+
+TODO(ry) Remove the above step by a deps submodule.
+
+Wrapper around the gclient/gn/ninja for end users. Try this first:
+
+    ./tools/build.py --use_ccache --debug
+
+If that doesn't work, or you need more control, try calling gn manually:
+
+    gn gen out/Debug --args='cc_wrapper="ccache" is_debug=true '
+
+Then build with ninja:
+
+    ninja -C out/Debug/ deno
+
+
+Other useful commands:
+
+    gn args out/Debug/ --list # List build args
+    gn args out/Debug/ # Modify args in $EDITOR