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More snap improvements for use with agents: * `yarn snap compile [--debug] <path>` for compiling any file, optionally with debug logs * `yarn snap minimize <path>` now accepts path as a positional param for consistency w 'compile' command * Both compile/minimize commands properly handle paths relative to the compiler/ directory. When using `yarn snap` the current working directory is compiler/packages/snap, but you're generally running it from the compiler directory so this matches expectations of callers better.
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1.6 KiB
React Compiler Development Guide
Note: for general notes about contributing, see the CONTRIBUTING.md.
Compiler Development
For general compiler development we recommend the following workflow:
# Install dependencies
yarn
# build the custom test runner
yarn snap:build
# Run the primary tests in watch mode
yarn snap --watch
snap is our custom test runner, which creates "golden" test files that have the expected output for each input fixture, as well as the results of executing a specific input (or sequence of inputs) in both the uncompiled and compiler versions of the input.
Compiling Arbitrary Files
You can compile any file (not just fixtures) using:
# Compile a file and see the output
yarn snap compile <path>
# Compile with debug output to see the state after each compiler pass
# This is an alternative to `yarn snap -d -p <pattern>` when you don't have a fixture file yet
yarn snap compile --debug <path>
Minimizing Test Cases
To reduce a failing test case to its minimal reproduction:
# Minimize a file that causes a compiler error
yarn snap minimize <path>
# Minimize and update the file in-place
yarn snap minimize --update <path>
When contributing changes, we prefer to:
- Add one or more fixtures that demonstrate the current compiled output for a particular combination of input and configuration. Send this as a first PR.
- Then, make changes to the compiler that achieve the desired output for those examples. Commit both the output changes and the corresponding compiler changes in a second PR.