Replace "instanceof Array" in transformer with "[object Array]" comparison#3985
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michaelficarra merged 1 commit intojashkenas:masterfrom Jun 5, 2015
Merged
Replace "instanceof Array" in transformer with "[object Array]" comparison#3985michaelficarra merged 1 commit intojashkenas:masterfrom
michaelficarra merged 1 commit intojashkenas:masterfrom
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…rison Testing with `'[object Array]' is Object::toString.call element` allows arrays from another JS context to be properly handled. The specific use case here is to support jest, which sets up JS contexts using Node/io.js's "vm" module. This approach works in ES3 environments in contrast with ES5's `Array.isArray`.
Collaborator
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In #3984 you also changed browser.coffee, but you haven't here. Is that intentional? |
Contributor
Author
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Yeah, since I didn't have a need for it and I didn't expect browser.coffee to run in a Node vm context (which was having trouble with instanceof Array in the first place). |
Collaborator
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LGTM. |
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Is it a good to go for merge? There is a dependency where we wait for this PR. |
michaelficarra
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Replace "instanceof Array" in transformer with "[object Array]" comparison
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Thanks! |
EsrefDurna
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Nov 12, 2025
Replace "instanceof Array" in transformer with "[object Array]" comparison
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Testing with
'[object Array]' is Object::toString.call elementallows arrays from another JS context to be properly handled. The specific use case here is to support jest, which sets up JS contexts using Node/io.js's "vm" module. This approach works in ES3 environments in contrast with ES5'sArray.isArray.