Flow: Error when parsing colons in a comment
Flow version: 0.102
Expected behavior
No error or warning
Actual behavior
Throws a Unexpected token :Flow(ParseError)
When parsing
/* : */
or
/* ::: */
but not when there is two :
/* :: */
if other characters are present in the string (before the first colon) the error vanishes
hmenzagh
All 3 comments
This is special syntax
goodmind
on 14 Jul 2019
jcready
on 15 Jul 2019
This should only apply when the file has the // @flow pragma. enabling Flow on a file changes the semantics of this, and one other construct -- a<b>(c) becomes a type argument, rather than ((a < b) > c). all our other syntax extensions are otherwise invalid JS, as far as I know.
So, this is working as intended (reopen if it's happening without @flow). If anything, we could probably use better documentation about the semantics changes vs normal JS.
mroch
on 15 Jul 2019
👍2
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Most helpful comment
This should only apply when the file has the
// @flowpragma. enabling Flow on a file changes the semantics of this, and one other construct --a<b>(c)becomes a type argument, rather than((a < b) > c). all our other syntax extensions are otherwise invalid JS, as far as I know.So, this is working as intended (reopen if it's happening without
@flow). If anything, we could probably use better documentation about the semantics changes vs normal JS.