Add --check and --format actions #785
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Adds the
--checkflag, which returns an error if the input is incorrectly formatted, or 0 otherwise.If the
--checkflag is not present, or if the--formatflag is specified, thenprettierdreverts to the default behaviour of formatting the flag.If both flags are specified, the last one wins (i.e.
--check --formatwill format the document).This resolves #784, and makes it possible to use
prettierdas a linter, e.g. in precommit hooks or similar situations.