rename source map prefix (#8034)

### Description

Change source map prefix from `/turbopack/` to `turbopack://` to be more
inline with other tools.

This gives turbopack as separate root namespace for sources

### Testing Instructions

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  Give a quick description of steps to test your changes.
-->


Closes PACK-2998

crates/turbopack-core/src/lib.rs

@@ -46,7 +46,7 @@ pub mod virtual_fs {
 }
 
 pub const PROJECT_FILESYSTEM_NAME: &str = "project";
-pub const SOURCE_MAP_ROOT_NAME: &str = "turbopack";
+pub const SOURCE_MAP_PREFIX: &str = "turbopack://";
 
 #[doc(hidden)]
 pub mod __private {

crates/turbopack-core/src/source_map/mod.rs

@@ -14,7 +14,7 @@ use turbo_tasks_fs::{
     FileContent, FileSystemPath,
 };
 
-use crate::{source_pos::SourcePos, SOURCE_MAP_ROOT_NAME};
+use crate::{source_pos::SourcePos, SOURCE_MAP_PREFIX};
 
 pub(crate) mod source_map_asset;
 
@@ -398,7 +398,7 @@ impl SourceMap {
             Ok(
                 if let Some(path) = *origin.parent().try_join(source_request.to_string()).await? {
                     let path_str = path.to_string().await?;
-                    let source = format!("/{SOURCE_MAP_ROOT_NAME}/{}", path_str);
+                    let source = format!("{SOURCE_MAP_PREFIX}{}", path_str);
                     let source_content = if let Some(source_content) = source_content {
                         source_content
                     } else if let FileContent::Content(file) = &*path.read().await? {
@@ -416,7 +416,7 @@ impl SourceMap {
                         .replace_all(&source_request, |s: &regex::Captures<'_>| {
                             s[0].replace('.', "_")
                         });
-                    let source = format!("/{SOURCE_MAP_ROOT_NAME}/{}/{}", origin_str, source);
+                    let source = format!("{SOURCE_MAP_PREFIX}{}/{}", origin_str, source);
                     let source_content = source_content.unwrap_or_else(|| {
                         format!(
                             "unable to access {source_request} in {origin_str} (it's leaving the \

crates/turbopack-css/src/parse.rs

@@ -1,5 +1,5 @@
 use swc_core::common::{source_map::SourceMapGenConfig, FileName};
-use turbopack_core::SOURCE_MAP_ROOT_NAME;
+use turbopack_core::SOURCE_MAP_PREFIX;
 
 /// A config to generate a source map which includes the source content of every
 /// source file. SWC doesn't inline sources content by default when generating a
@@ -9,7 +9,7 @@ pub struct InlineSourcesContentConfig {}
 impl SourceMapGenConfig for InlineSourcesContentConfig {
     fn file_name_to_source(&self, f: &FileName) -> String {
         match f {
-            FileName::Custom(s) => format!("/{SOURCE_MAP_ROOT_NAME}/{s}"),
+            FileName::Custom(s) => format!("{SOURCE_MAP_PREFIX}{s}"),
             _ => f.to_string(),
         }
     }

crates/turbopack-css/src/process.rs

@@ -48,7 +48,7 @@ use turbopack_core::{
     source::Source,
     source_map::{GenerateSourceMap, OptionSourceMap},
     source_pos::SourcePos,
-    SOURCE_MAP_ROOT_NAME,
+    SOURCE_MAP_PREFIX,
 };
 use turbopack_swc_utils::emitter::IssueEmitter;
 
@@ -977,7 +977,7 @@ impl GenerateSourceMap for ParseCssResultSourceMap {
                 let mut builder = SourceMapBuilder::new(None);
 
                 for src in source_map.get_sources() {
-                    builder.add_source(&format!("/{SOURCE_MAP_ROOT_NAME}/{src}"));
+                    builder.add_source(&format!("{SOURCE_MAP_PREFIX}{src}"));
                 }
 
                 for (idx, content) in source_map.get_sources_content().iter().enumerate() {

crates/turbopack-ecmascript/src/parse.rs

@@ -30,7 +30,7 @@ use turbopack_core::{
     issue::{Issue, IssueExt, IssueSeverity, IssueStage, OptionStyledString, StyledString},
     source::Source,
     source_map::{GenerateSourceMap, OptionSourceMap, SourceMap},
-    SOURCE_MAP_ROOT_NAME,
+    SOURCE_MAP_PREFIX,
 };
 use turbopack_swc_utils::emitter::IssueEmitter;
 
@@ -140,7 +140,7 @@ impl SourceMapGenConfig for InlineSourcesContentConfig {
     fn file_name_to_source(&self, f: &FileName) -> String {
         match f {
             FileName::Custom(s) => {
-                format!("/{SOURCE_MAP_ROOT_NAME}/{s}")
+                format!("{SOURCE_MAP_PREFIX}{s}")
             }
             _ => f.to_string(),
         }

crates/turbopack-node/src/source_map/mod.rs

@@ -16,8 +16,7 @@ use turbo_tasks_fs::{
 };
 use turbopack_cli_utils::source_context::format_source_context_lines;
 use turbopack_core::{
-    output::OutputAsset, source_map::GenerateSourceMap, PROJECT_FILESYSTEM_NAME,
-    SOURCE_MAP_ROOT_NAME,
+    output::OutputAsset, source_map::GenerateSourceMap, PROJECT_FILESYSTEM_NAME, SOURCE_MAP_PREFIX,
 };
 use turbopack_ecmascript::magic_identifier::unmangle_identifiers;
 
@@ -233,9 +232,8 @@ async fn resolve_source_mapping(
         TraceResult::Found(frame) => {
             let lib_code = frame.file.contains("/node_modules/");
             if let Some(project_path) = frame.file.strip_prefix(concatcp!(
-                "/",
-                SOURCE_MAP_ROOT_NAME,
-                "/[",
+                SOURCE_MAP_PREFIX,
+                "[",
                 PROJECT_FILESYSTEM_NAME,
                 "]/"
             )) {