Set ascii_only for swc emit #9243
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fregante
reviewed
Sep 14, 2023
fregante
reviewed
Sep 14, 2023
| swc_core::ecma::codegen::Config::default().with_target(swc_core::ecma::ast::EsVersion::Es5); | ||
| let config = swc_core::ecma::codegen::Config::default() | ||
| .with_target(swc_core::ecma::ast::EsVersion::Es5) | ||
| .with_ascii_only(true); |
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Does this also affect pre-existing unicode characters? E.g. does it turn '🙂' into '\uD83D\uDE42'?
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You're right. So I think we shouldn't actually do this.
This leads to the question: if Chrome allows 🙂, then why does it not allow some other unicode that is probably equally valid? (Unless it isn't valid which is what I asked about here)
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What changed in 2.7 that caused this issue in the first place?
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Probably a swc upgrade.
Input: ["\u0085", "\u200b", "\ufffe", "🙂"];
With 2.6.2: ["\x85", "\u200B", "\uFFFE", "\uD83D\uDE42"]
With 2.7.0: ["\x85", "", "�", "\uD83D\uDE42"]
With 2.9.0: ["\x85", "", "�", "\uD83D\uDE42"]
So your concern is already the case, it just doesn't happen for single-codepoint characters (or something like that)
does it turn
'🙂'into'\uD83D\uDE42'?
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So yeah, this PR would restore the behavior from 2.6.2, which is perfectly fine to me and hasn't bothered anyone since.
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devongovett
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Sep 27, 2023
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Closes #8877
Don't replace unicode escape sequences with the corresponding unicode character, but leave that to the optimizer (which makes it possible to disable the replacement with a terserrc)
This was the case some time ago