rspack_plugin_javascript 0.100.7

rspack javascript plugin
Documentation 
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

use rspack_core::ConstDependency;
use swc_experimental_allocator::wtf8::Wtf8;
use swc_experimental_ecma_ast::{GetSpan, Lit, Program};

use super::JavascriptParserPlugin;
use crate::visitors::JavascriptParser;

pub struct UseStrictPlugin;

#[rspack_macros::implemented_javascript_parser_hooks]
impl<'p, 'a> JavascriptParserPlugin<'p, 'a> for UseStrictPlugin {
  fn program(&self, parser: &mut JavascriptParser<'p>, ast: &Program<'_>) -> Option<bool> {
    let first = match ast {
      Program::Module(ast) => ast.body.first().and_then(|i| i.as_stmt()),
      Program::Script(ast) => ast.body.first(),
    }
    .and_then(|i| i.as_expr());
    if let Some(first) = first
      && first.expr.as_lit().and_then(|i| match i {
        Lit::Str(s) => Some(s.value.as_wtf8()),
        _ => None,
      }) == Some(Wtf8::from_str("use strict"))
    {
      // Remove "use strict" expression. It will be added later by the renderer again.
      // This is necessary in order to not break the strict mode when webpack prepends code.
      let dep = ConstDependency::new(first.span().into(), "".into());
      parser.add_presentational_dependency(Box::new(dep));
      parser.build_info.strict = true;
    }
    None
  }
}