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perf: always return void 0
as undefined node
#10243
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nicolo-ribaudo
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JLHwung:build-undefiend-without-scope
Aug 1, 2019
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perf: always return void 0
as undefined node
#10243
nicolo-ribaudo
merged 1 commit into
babel:master
from
JLHwung:build-undefiend-without-scope
Aug 1, 2019
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JLHwung
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perf: always return
perf: always return Jul 19, 2019
void 0
as undefined codevoid 0
as undefined node
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Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/11182/ |
Maybe in the next major? |
nicolo-ribaudo
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Jul 19, 2019
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Jul 20, 2019
Sure. We would not get rid of it on 7.x |
jridgewell
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Effectively,
this.hasBinding("undefined")
will always returns true sinceundefined
is a global property. Asvoid 0
is safer thanundefined
, here we remove theif
conditional check.buildUndefinedNode
will be a bit faster as it doesn't have to look through the nested scopes.I would also suggest that we move
buildUndefinedNode
to babel-types and clearly state that it is not relevant to the Scope class.