feat(wasm): support codegen sourcemap (#9315)

- Related oxc-project/playground#52
- Required by oxc-project/playground#63

This PR adds `CodegenOption.enable_sourcemap` option and
`codegen_sourcemap_text` state for
oxc-project/playground#52.

crates/oxc_wasm/src/lib.rs

@@ -67,6 +67,9 @@ pub struct Oxc {
     #[wasm_bindgen(readonly, skip_typescript, js_name = "codegenText")]
     pub codegen_text: String,
 
+    #[wasm_bindgen(readonly, skip_typescript, js_name = "codegenSourcemapText")]
+    pub codegen_sourcemap_text: Option<String>,
+
     #[wasm_bindgen(readonly, skip_typescript, js_name = "formattedText")]
     pub formatted_text: String,
 
@@ -178,7 +181,7 @@ impl Oxc {
         let parser_options = parser_options.unwrap_or_default();
         let _linter_options = linter_options.unwrap_or_default();
         let minifier_options = minifier_options.unwrap_or_default();
-        let _codegen_options = codegen_options.unwrap_or_default();
+        let codegen_options = codegen_options.unwrap_or_default();
         let transform_options = transform_options.unwrap_or_default();
         let control_flow_options = control_flow_options.unwrap_or_default();
 
@@ -252,10 +255,22 @@ impl Oxc {
                     IsolatedDeclarations::new(&allocator, IsolatedDeclarationsOptions::default())
                         .build(&program);
                 if ret.errors.is_empty() {
-                    self.codegen_text = CodeGenerator::new().build(&ret.program).code;
+                    let codegen_result = CodeGenerator::new()
+                        .with_options(CodegenOptions {
+                            source_map_path: codegen_options
+                                .enable_sourcemap
+                                .unwrap_or_default()
+                                .then(|| path.clone()),
+                            ..CodegenOptions::default()
+                        })
+                        .build(&ret.program);
+                    self.codegen_text = codegen_result.code;
+                    self.codegen_sourcemap_text =
+                        codegen_result.map.map(|map| map.to_json_string());
                 } else {
                     self.save_diagnostics(ret.errors.into_iter().collect::<Vec<_>>());
                     self.codegen_text = String::new();
+                    self.codegen_sourcemap_text = None;
                 }
                 return Ok(());
             }
@@ -301,14 +316,19 @@ impl Oxc {
             None
         };
 
-        self.codegen_text = CodeGenerator::new()
+        let codegen_result = CodeGenerator::new()
             .with_symbol_table(symbol_table)
             .with_options(CodegenOptions {
                 minify: minifier_options.whitespace.unwrap_or_default(),
+                source_map_path: codegen_options
+                    .enable_sourcemap
+                    .unwrap_or_default()
+                    .then(|| path.clone()),
                 ..CodegenOptions::default()
             })
-            .build(&program)
-            .code;
+            .build(&program);
+        self.codegen_text = codegen_result.code;
+        self.codegen_sourcemap_text = codegen_result.map.map(|map| map.to_json_string());
         self.ir = format!("{:#?}", program.body);
         self.convert_ast(&mut program);
 

crates/oxc_wasm/src/options.rs

@@ -86,6 +86,8 @@ pub struct OxcCodegenOptions {
     pub indentation: Option<u8>,
     #[tsify(optional)]
     pub enable_typescript: Option<bool>,
+    #[tsify(optional)]
+    pub enable_sourcemap: Option<bool>,
 }
 
 #[derive(Debug, Default, Clone, Deserialize, Tsify)]

npm/oxc-wasm/oxc_wasm.d.ts

@@ -1,6 +1,34 @@
 /* tslint:disable */
 /* eslint-disable */
 export function browserslist(query: string, opts: any): any;
+
+import type { Program, Span } from "@oxc-project/types";
+export * from "@oxc-project/types";
+
+
+export interface Oxc {
+    ast: Program;
+    astJson: string;
+    ir: string;
+    controlFlowGraph: string;
+    symbols: any;
+    scopeText: string;
+    codegenText: string;
+    codegenSourcemapText: string | null;
+    formattedText: string;
+    prettierFormattedText: string;
+    prettierIrText: string;
+}
+
+export interface Comment {
+    type: CommentType;
+    value: string;
+    start: number;
+    end: number;
+}
+
+export type CommentType = "Line" | "Block";
+
 export interface OxcOptions {
     run?: OxcRunOptions;
     parser?: OxcParserOptions;
@@ -40,6 +68,7 @@ export interface OxcTransformerOptions {
 export interface OxcCodegenOptions {
     indentation?: number;
     enableTypescript?: boolean;
+    enableSourcemap?: boolean;
 }
 
 export interface OxcControlFlowOptions {
@@ -64,43 +93,6 @@ export interface OxcCompressOptions {
 }
 
 
-import type { Program, Span } from "@oxc-project/types";
-export * from "@oxc-project/types";
-
-
-export interface Oxc {
-    ast: Program;
-    astJson: string;
-    ir: string;
-    controlFlowGraph: string;
-    symbols: any;
-    scopeText: string;
-    codegenText: string;
-    formattedText: string;
-    prettierFormattedText: string;
-    prettierIrText: string;
-}
-
-export interface Comment {
-    type: CommentType;
-    value: string;
-    start: number;
-    end: number;
-}
-
-export type CommentType = "Line" | "Block";
-
-
-export type NodeId = number;
-export type NodeFlags = {
-    JSDoc: 1,
-    Class: 2,
-    HasYield: 4
-    Parameter: 8
-};
-
-
-
 export type ReferenceId = number;
 export type ReferenceFlags = {
     None: 0,
@@ -112,13 +104,23 @@ export type ReferenceFlags = {
 
 
 
+export type SymbolId = number;
+export type SymbolFlags = unknown;
+export type RedeclarationId = unknown;
+
+
+
 export type ScopeId = number;
 
 
 
-export type SymbolId = number;
-export type SymbolFlags = unknown;
-export type RedeclarationId = unknown;
+export type NodeId = number;
+export type NodeFlags = {
+    JSDoc: 1,
+    Class: 2,
+    HasYield: 4
+    Parameter: 8
+};
 
 
 export class Oxc {
@@ -153,6 +155,7 @@ export interface InitOutput {
   readonly __wbg_get_oxc_symbols: (a: number) => any;
   readonly __wbg_get_oxc_scopeText: (a: number) => [number, number];
   readonly __wbg_get_oxc_codegenText: (a: number) => [number, number];
+  readonly __wbg_get_oxc_codegenSourcemapText: (a: number) => [number, number];
   readonly __wbg_get_oxc_formattedText: (a: number) => [number, number];
   readonly __wbg_get_oxc_prettierFormattedText: (a: number) => [number, number];
   readonly __wbg_get_oxc_prettierIrText: (a: number) => [number, number];