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page_config.rs
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page_config.rs
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use chrono::Utc;
use swc_common::{Span, DUMMY_SP};
use swc_ecmascript::ast::*;
use swc_ecmascript::utils::HANDLER;
use swc_ecmascript::visit::{Fold, FoldWith};
pub fn page_config(is_development: bool, is_page_file: bool) -> impl Fold {
PageConfig {
is_development,
is_page_file,
..Default::default()
}
}
pub fn page_config_test() -> impl Fold {
PageConfig {
in_test: true,
is_page_file: true,
..Default::default()
}
}
#[derive(Debug, Default)]
struct PageConfig {
drop_bundle: bool,
in_test: bool,
is_development: bool,
is_page_file: bool,
}
const STRING_LITERAL_DROP_BUNDLE: &str = "__NEXT_DROP_CLIENT_FILE__";
const CONFIG_KEY: &str = "config";
impl Fold for PageConfig {
fn fold_module_items(&mut self, items: Vec<ModuleItem>) -> Vec<ModuleItem> {
let mut new_items = vec![];
for item in items {
new_items.push(item.fold_with(self));
if !self.is_development && self.drop_bundle {
let timestamp = match self.in_test {
true => String::from("mock_timestamp"),
false => Utc::now().timestamp().to_string(),
};
return vec![ModuleItem::Stmt(Stmt::Decl(Decl::Var(VarDecl {
decls: vec![VarDeclarator {
name: Pat::Ident(BindingIdent {
id: Ident {
sym: STRING_LITERAL_DROP_BUNDLE.into(),
span: DUMMY_SP,
optional: false,
},
type_ann: None,
}),
init: Some(Box::new(Expr::Lit(Lit::Str(Str {
value: format!("{} {}", STRING_LITERAL_DROP_BUNDLE, timestamp).into(),
span: DUMMY_SP,
raw: None,
})))),
span: DUMMY_SP,
definite: false,
}],
span: DUMMY_SP,
kind: VarDeclKind::Const,
declare: false,
})))];
}
}
new_items
}
fn fold_export_decl(&mut self, export: ExportDecl) -> ExportDecl {
if let Decl::Var(var_decl) = &export.decl {
for decl in &var_decl.decls {
let mut is_config = false;
if let Pat::Ident(ident) = &decl.name {
if &ident.id.sym == CONFIG_KEY {
is_config = true;
}
}
if is_config {
if let Some(expr) = &decl.init {
if let Expr::Object(obj) = &**expr {
for prop in &obj.props {
if let PropOrSpread::Prop(prop) = prop {
if let Prop::KeyValue(kv) = &**prop {
match &kv.key {
PropName::Ident(ident) => {
if &ident.sym == "amp" {
if let Expr::Lit(Lit::Bool(Bool {
value,
..
})) = &*kv.value
{
if *value && self.is_page_file {
self.drop_bundle = true;
}
} else if let Expr::Lit(Lit::Str(_)) =
&*kv.value
{
// Do not replace
// bundle
} else {
self.handle_error(
"Invalid value found.",
export.span,
);
}
}
}
_ => {
self.handle_error(
"Invalid property found.",
export.span,
);
}
}
} else {
self.handle_error(
"Invalid property or value.",
export.span,
);
}
} else {
self.handle_error(
"Property spread is not allowed.",
export.span,
);
}
}
} else {
self.handle_error("Expected config to be an object.", export.span);
}
} else {
self.handle_error("Expected config to be an object.", export.span);
}
}
}
}
export
}
fn fold_export_named_specifier(
&mut self,
specifier: ExportNamedSpecifier,
) -> ExportNamedSpecifier {
match &specifier.exported {
Some(ident) => {
if let ModuleExportName::Ident(ident) = ident {
if &ident.sym == CONFIG_KEY {
self.handle_error("Config cannot be re-exported.", specifier.span)
}
}
}
None => {
if let ModuleExportName::Ident(ident) = &specifier.orig {
if &ident.sym == CONFIG_KEY {
self.handle_error("Config cannot be re-exported.", specifier.span)
}
}
}
}
specifier
}
}
impl PageConfig {
fn handle_error(&mut self, details: &str, span: Span) {
if self.is_page_file {
let message = format!("Invalid page config export found. {} \
See: https://nextjs.org/docs/messages/invalid-page-config", details);
HANDLER.with(|handler| handler.struct_span_err(span, &message).emit());
}
}
}