Non-null Types and Non-null By Default (NNBD)

Dart Enhancement Process (DEP) proposal for non-null types and non-null by default. The full proposal is available in two formats:

• PDF, or
• markdown (autogenerated, DO NOT EDIT).

Original markdown sources for the proposal are under doc-src.

---

If you make changes and want to generate the PDF, then follow these instructions. (When submitting a Pull Request, there is no need to submit the PDF or .md under doc.)

1. To build the proposal you will need Pandoc, which can be installed as a brew cask as follows:

   $ brew cask install pandoc

   (The pandoc cask takes minutes to install, against hours for the homebrew pandoc Formula.)

2. We also have a simple custom Pandoc filter that requires a node package so run:

   $ npm install

3. To generate a PDF run:

   $ make