fix(es/minifier): Mark delete as a property mutation

[kdy1]

Description:

Related issue:

• Closes Compress is using deleted properties with "sourceType": "module" #6004.

[kdy1]

swc-bump:

• swc_ecma_minifier

[jridgewell]

I think this is only catching delete foo.bar, but fails to capture delete foo.bar.baz? Based on the Expr::Ident(obj) = e.obj we're inside of. Come to think of it, there are a few others like foo().bar that won't be caught?

[kdy1]

For delete foo.bar.baz, foo will be marked as property mutated because we don't unset is_delete_arg for the obj of MemberExpr. (

swc/crates/swc_ecma_minifier/src/analyzer/mod.rs

Lines 1032 to 1040 in 114bc97

	{
	let ctx = Ctx {
	is_exact_arg: false,
	is_exact_reassignment: false,
	is_callee: false,
	..self.ctx
	};
	e.obj.visit_with(&mut *self.with_ctx(ctx));
	}

)
And currently, we do not inline properties. But nice catch, we should ensure it when we add partial, per-property inlining.

[jridgewell]

Ok, we're tracking if a variable reference has any mutations, and this is now detecting property mutations as a mutation of the variable.

[swc-bot]

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