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Informations about the package pragma

Pragma

A structured way of embedding source analyzer metadata in Hack.

How to use

For details on the strings passed to pragma(...) and Pragmas(vec[...]), read the documentation of the source analyzer.

For implementers

This package contains one class and one function:

They are general replacements for structured comments.

@lint-ignore isn't a normal comment from the perspective of some tool. It suppresses a lint error from being raised for an unused pure expression.

I subscribe wholehartedly to the following quote from the CppCoreGuidelines:

If over half of the comments in a project are to silence some tool, be it the Hack typechecker or a linter, programmers will be even more inclined to skip reading the comments. It will instill fear for removing useless comments, since some tool might rely on them.

The idea behind the pragma(...) directive is to eliminate these comments. The following code block expersses the same intent.

Q: Why would this string-based system be better than actual attributes?

If you wish to accept pragma(...) directives and <<Pragmas(vec[...])>> attributes in your own source analyzers, read pragma.hack for the details for this informal standard.

All versions of pragma with dependencies

PHP Build Version
Package Version
Requires hhvm Version ^4.102
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