File size: 2,167 Bytes
1e92f2d |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 |
use swc_core::{
common::{comments::Comments, errors::HANDLER, util::take::Take, Span, Spanned, DUMMY_SP},
ecma::{
ast::{CallExpr, Callee, EmptyStmt, Expr, Module, ModuleDecl, ModuleItem, Stmt},
visit::{noop_visit_mut_type, VisitMut, VisitMutWith},
},
};
use crate::transforms::import_analyzer::ImportMap;
pub fn pure_magic<C>(comments: C) -> PureTransform<C>
where
C: Comments,
{
PureTransform {
imports: Default::default(),
comments,
}
}
pub struct PureTransform<C>
where
C: Comments,
{
imports: ImportMap,
comments: C,
}
const MODULE: &str = "next/dist/build/swc/helpers";
const FN_NAME: &str = "__nextjs_pure";
impl<C> VisitMut for PureTransform<C>
where
C: Comments,
{
fn visit_mut_expr(&mut self, e: &mut Expr) {
e.visit_mut_children_with(self);
if let Expr::Call(CallExpr {
span,
callee: Callee::Expr(callee),
args,
..
}) = e
{
if !self.imports.is_import(callee, MODULE, FN_NAME) {
return;
}
if args.len() != 1 {
HANDLER.with(|handler| {
handler
.struct_span_err(*span, "markAsPure() does not support multiple arguments")
.emit();
});
return;
}
*e = *args[0].expr.take();
let mut lo = e.span().lo;
if lo.is_dummy() {
lo = Span::dummy_with_cmt().lo;
}
self.comments.add_pure_comment(lo);
}
}
fn visit_mut_module(&mut self, m: &mut Module) {
self.imports = ImportMap::analyze(m);
m.visit_mut_children_with(self);
}
fn visit_mut_module_item(&mut self, m: &mut ModuleItem) {
if let ModuleItem::ModuleDecl(ModuleDecl::Import(import)) = m {
if import.src.value == MODULE {
*m = ModuleItem::Stmt(Stmt::Empty(EmptyStmt { span: DUMMY_SP }));
return;
}
}
m.visit_mut_children_with(self);
}
noop_visit_mut_type!();
}
|