Add sourcemap generation to JavaScript codegen target

compiler-cli/src/compile_package.rs

@@ -30,6 +30,7 @@ pub fn command(options: CompilePackage) -> Result<()> {
         Target::Erlang => TargetCodegenConfiguration::Erlang { app_file: None },
         Target::JavaScript => TargetCodegenConfiguration::JavaScript {
             emit_typescript_definitions: false,
+            emit_source_map: false,
             prelude_location: options
                 .javascript_prelude
                 .ok_or_else(|| Error::JavaScriptPreludeRequired)?,

compiler-cli/src/dependencies/tests.rs

@@ -958,6 +958,7 @@ fn package_config(
                 unstable: true,
                 location: None,
             },
+            sourcemaps: false,
         },
         target: Target::Erlang,
         internal_modules: None,

compiler-cli/src/format.rs

@@ -1,7 +1,6 @@
 use gleam_core::{
     error::{Error, FileIoAction, FileKind, Result, StandardIoAction, Unformatted},
-    io::Content,
-    io::OutputFile,
+    io::{Content, OutputFile},
 };
 use std::{io::Read, str::FromStr};
 

compiler-core/Cargo.toml

@@ -49,6 +49,8 @@ num-bigint = "0.4.6"
 num-traits = "0.2.19"
 # Encryption
 age = { version = "0.11", features = ["armor"] }
+# Sourcemap generation
+sourcemap = "9"
 
 async-trait.workspace = true
 base16.workspace = true

compiler-core/src/build.rs

@@ -20,6 +20,7 @@ use crate::ast::{
     CallArg, CustomType, DefinitionLocation, Pattern, TypeAst, TypedArg, TypedDefinition,
     TypedExpr, TypedFunction, TypedPattern, TypedStatement,
 };
+use crate::sourcemap::SourceMapEmitter;
 use crate::type_::Type;
 use crate::{
     ast::{Definition, SrcSpan, TypedModule},
@@ -142,6 +143,7 @@ impl Default for Runtime {
 pub enum TargetCodegenConfiguration {
     JavaScript {
         emit_typescript_definitions: bool,
+        emit_source_map: bool,
         prelude_location: Utf8PathBuf,
     },
     Erlang {

compiler-core/src/build/package_compiler.rs

@@ -1,5 +1,6 @@
 use crate::analyse::{ModuleAnalyzerConstructor, TargetSupport};
 use crate::line_numbers::{self, LineNumbers};
+use crate::sourcemap::{SourceMapEmitter, SourceMapSupport};
 use crate::type_::PRELUDE_MODULE_NAME;
 use crate::{
     ast::{SrcSpan, TypedModule, UntypedModule},
@@ -302,10 +303,12 @@ where
         match self.target {
             TargetCodegenConfiguration::JavaScript {
                 emit_typescript_definitions,
+                emit_source_map,
                 prelude_location,
             } => self.perform_javascript_codegen(
                 modules,
                 *emit_typescript_definitions,
+                *emit_source_map,
                 prelude_location,
             ),
             TargetCodegenConfiguration::Erlang { app_file } => {
@@ -365,6 +368,7 @@ where
         &mut self,
         modules: &[Module],
         typescript: bool,
+        emit_source_map: bool,
         prelude_location: &Utf8Path,
     ) -> Result<(), Error> {
         let mut written = HashSet::new();
@@ -373,9 +377,20 @@ where
         } else {
             TypeScriptDeclarations::None
         };
+        let sourcemap = if emit_source_map {
+            SourceMapSupport::Emit
+        } else {
+            SourceMapSupport::None
+        };
 
-        JavaScript::new(&self.out, typescript, prelude_location, self.target_support)
-            .render(&self.io, modules)?;
+        JavaScript::new(
+            &self.out,
+            typescript,
+            sourcemap,
+            prelude_location,
+            self.target_support,
+        )
+        .render(&self.io, modules)?;
 
         if self.copy_native_files {
             self.copy_project_native_files(&self.out, &mut written)?;