feat: support creating RawSource from static &str (#129)

* feat: support creating `RawSource` from static str

* feat: assert

* feat: rename

Author: h-a-n-a

Cargo.lock

@@ -38,6 +38,7 @@ dashmap = "5"
 memchr = "2.6.4"
 
 codspeed-criterion-compat = { version = "2.3.3", default-features = false, optional = true }
+static_assertions = "1.1.0"
 simd-json = "=0.14.0-rc.2"
 
 [dev-dependencies]

Cargo.toml

@@ -15,9 +15,12 @@ use crate::{
 #[derive(Clone, PartialEq, Eq)]
 enum RawValue {
   Buffer(Vec<u8>),
-  String(String),
+  String(Cow<'static, str>),
 }
 
+#[cfg(any(target_arch = "x86_64", target_arch = "aarch64"))]
+static_assertions::assert_eq_size!(RawValue, [u8; 32]);
+
 /// Represents source code without source map, it will not create source map for the source code.
 ///
 /// - [webpack-sources docs](https://github.com/webpack/webpack-sources/#rawsource).
@@ -36,6 +39,24 @@ pub struct RawSource {
   value_as_string: OnceLock<String>,
 }
 
+impl RawSource {
+  /// Create a new [RawSource] from a static &str.
+  ///
+  /// ```
+  /// use rspack_sources::{RawSource, Source};
+  ///
+  /// let code = "some source code";
+  /// let s = RawSource::from_static(code);
+  /// assert_eq!(s.source(), code);
+  /// ```
+  pub fn from_static(s: &'static str) -> Self {
+    Self {
+      value: RawValue::String(Cow::Borrowed(s)),
+      value_as_string: Default::default(),
+    }
+  }
+}
+
 impl Clone for RawSource {
   fn clone(&self) -> Self {
     Self {
@@ -57,7 +78,7 @@ impl RawSource {
 impl From<String> for RawSource {
   fn from(value: String) -> Self {
     Self {
-      value: RawValue::String(value),
+      value: RawValue::String(value.into()),
       value_as_string: Default::default(),
     }
   }
@@ -75,7 +96,7 @@ impl From<Vec<u8>> for RawSource {
 impl From<&str> for RawSource {
   fn from(value: &str) -> Self {
     Self {
-      value: RawValue::String(value.to_string()),
+      value: RawValue::String(value.to_string().into()),
       value_as_string: Default::default(),
     }
   }