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feat(es/minifier): Remove noop spreads (#6803)

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**Related issue:**

 - Closes https://github.com/swc-project/swc/issues/6788.
This commit is contained in:
Donny/강동윤 2023-01-13 15:55:04 +09:00 committed by GitHub
parent b5adb7b842
commit 8f683e3f77
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3 changed files with 16 additions and 0 deletions
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11
crates/swc_ecma_minifier/src/compress/pure/mod.rs
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@ -12,6 +12,7 @@ use swc_ecma_visit::{noop_visit_mut_type, VisitMut, VisitMutWith, VisitWith};
use tracing::{debug, span, Level};
use self::{ctx::Ctx, misc::DropOpts};
use super::util::is_pure_undefined_or_null;
#[cfg(feature = "debug")]
use crate::debug::dump;
use crate::{
@ -760,6 +761,16 @@ impl VisitMut for Pure<'_> {
fn visit_mut_prop_or_spreads(&mut self, exprs: &mut Vec<PropOrSpread>) {
self.visit_par(exprs);
exprs.retain(|e| {
if let PropOrSpread::Spread(spread) = e {
if is_pure_undefined_or_null(&self.expr_ctx, &spread.expr) {
return false;
}
}
true
})
}
fn visit_mut_return_stmt(&mut self, s: &mut ReturnStmt) {

4
crates/swc_ecma_minifier/tests/pass-1/issue-6788/1/input.js Normal file
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@ -0,0 +1,4 @@
const foo = { ...(null && {}) };
const bar = { ...null };
console.log(foo, bar);

1
crates/swc_ecma_minifier/tests/pass-1/issue-6788/1/output.js Normal file
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@ -0,0 +1 @@
console.log({}, {});