Treeshake sequence expression #1650
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- if the test evaluation produces an effect, keep the whole expression - if the test evaluation is unkown but has no effect, remove the expression unless any branch has an effect - if the test evaluation is known, replace the expression with the resulting branch (as before)
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Is #1648 a superset of this PR? |
lukastaegert
approved these changes
Sep 28, 2017
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@kzc It looks like it but from my side we should merge both anyway. |
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@corneliusweig A combined PR would be helpful as it's a bit confusing. Thanks. The individual commits need not be collapsed. |
Looks at each expression in the sequence and only retains the node if it has an effect. Note: in sequence expressions with effects always keep the last node, to be consistent when assigning the resulting value to a variable.
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Since this is not a breaking change and I really want this to be in the master before I make my next PR I will merge this now. |
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This resolves #1649
The resulting code may have spurious parentheses that wrapped the sequence. For example
var a = (1,2,3)becomesvar a = (3)instead ofvar a = 3. Other than that, all cases covered in #1649 are covered.