2018-06-09 18:32:04 -04:00
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# Deno Prototype 2
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## Status
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This code is a rewrite of the unprivileged parts of Deno. It will soon become
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the root of the project.
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There are several goals:
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* Use the gn build system for fast builds, sane configuration, and easy
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linking into Chrome.
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* Use V8 snapshots to improve startup time.
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* Remove Golang. Although it has been working nicely, I am concerned the
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double GC will become a problem sometime down the road.
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* Distribute a C++ library called libdeno, containing the snapshotted
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typescript runtime.
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* Test the message passing and other functionality at that layer before
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involving higher level languages.
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The contenders for building the unprivileged part of Deno are Rust and C++.
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Thanks to Chrome and gn, using C++ to link into high level libraries is not
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untenable. However, there's a lot of interest in Rust in the JS community and
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it seems like a reasonable choice. TBD.
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There are many people exploring the project, so care will be taken to keep the
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2018-06-09 19:34:24 -04:00
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original code functional while this is developed. However, once it's ready
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2018-06-09 18:32:04 -04:00
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the code in this deno2/ directory will be moved to the root.
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## Prerequisites
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Get Depot Tools and make sure it's in your path.
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http://commondatastorage.googleapis.com/chrome-infra-docs/flat/depot_tools/docs/html/depot_tools_tutorial.html#_setting_up
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For linux you need these prereqs:
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sudo apt-get install libgtk-3-dev pkg-config ccache
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## Build
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First install the javascript deps.
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2018-06-09 19:34:24 -04:00
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cd js; yarn install
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2018-06-09 18:32:04 -04:00
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TODO(ry) Remove the above step by a deps submodule.
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Wrapper around the gclient/gn/ninja for end users. Try this first:
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./tools/build.py --use_ccache --debug
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If that doesn't work, or you need more control, try calling gn manually:
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gn gen out/Debug --args='cc_wrapper="ccache" is_debug=true '
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Then build with ninja:
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ninja -C out/Debug/ deno
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Other useful commands:
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gn args out/Debug/ --list # List build args
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gn args out/Debug/ # Modify args in $EDITOR
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