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template.expression should not parse string without interpolation as statement #196

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merged 1 commit into from Jun 13, 2017

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jsnajdr
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@jsnajdr jsnajdr commented May 14, 2017

Let's parse a function expression with jscodeshift.template.expression:

expression`function() {}`

This code is a valid expression, but not a valid statement -- a function needs to have a name to be a valid statement.

template.expression surrounds the code with () to force parsing as expression. However, it fails to do so if the template string doesn't have any interpolation parameters. Therefore, the above function expression fails to parse.

This PR fixes that bug -- the length of the template array is incorrectly checked. It should check for length === 1 instead of length === 0. Moreover, a special case for length === 1 is not even necessary.

…statement

If a template doesn't have any interpolation parameters (e.g., expression`function() {}`),
it should be also surrounded by () to force parsing as expression.
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@xixixao
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xixixao commented Jun 4, 2017

This indeed fixes a bug and looks good to merge.

@fkling fkling merged commit a983666 into facebook:master Jun 13, 2017
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4 participants