refactor(cli): rewrite Deno.transpileOnly() to use SWC (#8090)

Co-authored-by: Kitson Kelly <me@kitsonkelly.com>

8 files changed, 178 insertions, 131 deletions

diff --git a/cli/ast.rs b/cli/ast.rs
index 78cafca1b..44e5616e7 100644
--- a/cli/ast.rs
+++ b/cli/ast.rs
@@ -225,7 +225,7 @@ impl From<tsc_config::TsConfig> for EmitOptions {
     EmitOptions {
       check_js: options.check_js,
       emit_metadata: options.emit_decorator_metadata,
-      inline_source_map: true,
+      inline_source_map: options.inline_source_map,
       jsx_factory: options.jsx_factory,
       jsx_fragment_factory: options.jsx_fragment_factory,
       transform_jsx: options.jsx == "react",
@@ -356,8 +356,11 @@ impl ParsedModule {
 /// - `source` - The source code for the module.
 /// - `media_type` - The media type for the module.
 ///
+// NOTE(bartlomieju): `specifier` has `&str` type instead of
+// `&ModuleSpecifier` because runtime compiler APIs don't
+// require valid module specifiers
 pub fn parse(
-  specifier: &ModuleSpecifier,
+  specifier: &str,
   source: &str,
   media_type: &MediaType,
 ) -> Result<ParsedModule, AnyError> {
@@ -505,8 +508,9 @@ mod tests {
     let source = r#"import * as bar from "./test.ts";
     const foo = await import("./foo.ts");
     "#;
-    let parsed_module = parse(&specifier, source, &MediaType::JavaScript)
-      .expect("could not parse module");
+    let parsed_module =
+      parse(specifier.as_str(), source, &MediaType::JavaScript)
+        .expect("could not parse module");
     let actual = parsed_module.analyze_dependencies();
     assert_eq!(
       actual,
@@ -553,7 +557,7 @@ mod tests {
       }
     }
     "#;
-    let module = parse(&specifier, source, &MediaType::TypeScript)
+    let module = parse(specifier.as_str(), source, &MediaType::TypeScript)
       .expect("could not parse module");
     let (code, maybe_map) = module
       .transpile(&EmitOptions::default())
@@ -577,7 +581,7 @@ mod tests {
       }
     }
     "#;
-    let module = parse(&specifier, source, &MediaType::TSX)
+    let module = parse(specifier.as_str(), source, &MediaType::TSX)
       .expect("could not parse module");
     let (code, _) = module
       .transpile(&EmitOptions::default())
@@ -608,7 +612,7 @@ mod tests {
       }
     }
     "#;
-    let module = parse(&specifier, source, &MediaType::TypeScript)
+    let module = parse(specifier.as_str(), source, &MediaType::TypeScript)
       .expect("could not parse module");
     let (code, _) = module
       .transpile(&EmitOptions::default())
diff --git a/cli/dts/lib.deno.unstable.d.ts b/cli/dts/lib.deno.unstable.d.ts
index 1c1869827..0bd4c7474 100644
--- a/cli/dts/lib.deno.unstable.d.ts
+++ b/cli/dts/lib.deno.unstable.d.ts
@@ -480,8 +480,7 @@ declare namespace Deno {
    *                source map.
    * @param options An option object of options to send to the compiler. This is
    *                a subset of ts.CompilerOptions which can be supported by Deno.
-   *                Many of the options related to type checking and emitting
-   *                type declaration files will have no impact on the output.
+   *                If unsupported option is passed then the API will throw an error.
    */
   export function transpileOnly(
     sources: Record<string, string>,
diff --git a/cli/module_graph2.rs b/cli/module_graph2.rs
index 8ee60eb59..cc063c6c3 100644
--- a/cli/module_graph2.rs
+++ b/cli/module_graph2.rs
@@ -320,7 +320,8 @@ impl Module {
   /// Parse a module, populating the structure with data retrieved from the
   /// source of the module.
   pub fn parse(&mut self) -> Result<(), AnyError> {
-    let parsed_module = parse(&self.specifier, &self.source, &self.media_type)?;
+    let parsed_module =
+      parse(self.specifier.as_str(), &self.source, &self.media_type)?;
 
     // parse out any triple slash references
     for comment in parsed_module.get_leading_comments().iter() {
@@ -639,12 +640,13 @@ impl Graph2 {
     let mut ts_config = TsConfig::new(json!({
       "checkJs": false,
       "emitDecoratorMetadata": false,
+      "inlineSourceMap": true,
       "jsx": "react",
       "jsxFactory": "React.createElement",
       "jsxFragmentFactory": "React.Fragment",
     }));
     let maybe_ignored_options =
-      ts_config.merge_user_config(options.maybe_config_path)?;
+      ts_config.merge_tsconfig(options.maybe_config_path)?;
     let emit_options: EmitOptions = ts_config.into();
     let cm = Rc::new(swc_common::SourceMap::new(
       swc_common::FilePathMapping::empty(),
@@ -730,7 +732,7 @@ impl Graph2 {
       }));
     }
     let maybe_ignored_options =
-      config.merge_user_config(options.maybe_config_path)?;
+      config.merge_tsconfig(options.maybe_config_path)?;
 
     // Short circuit if none of the modules require an emit, or all of the
     // modules that require an emit have a valid emit.  There is also an edge
@@ -1187,13 +1189,14 @@ impl Graph2 {
     let mut ts_config = TsConfig::new(json!({
       "checkJs": false,
       "emitDecoratorMetadata": false,
+      "inlineSourceMap": true,
       "jsx": "react",
       "jsxFactory": "React.createElement",
       "jsxFragmentFactory": "React.Fragment",
     }));
 
     let maybe_ignored_options =
-      ts_config.merge_user_config(options.maybe_config_path)?;
+      ts_config.merge_tsconfig(options.maybe_config_path)?;
 
     let emit_options: EmitOptions = ts_config.clone().into();
 
diff --git a/cli/ops/runtime_compiler.rs b/cli/ops/runtime_compiler.rs
index b01469fa9..5ceb90316 100644
--- a/cli/ops/runtime_compiler.rs
+++ b/cli/ops/runtime_compiler.rs
@@ -1,12 +1,17 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 
+use crate::ast;
+use crate::colors;
+use crate::media_type::MediaType;
 use crate::permissions::Permissions;
 use crate::tsc::runtime_bundle;
 use crate::tsc::runtime_compile;
-use crate::tsc::runtime_transpile;
+use crate::tsc_config;
 use deno_core::error::AnyError;
 use deno_core::futures::FutureExt;
+use deno_core::serde::Serialize;
 use deno_core::serde_json;
+use deno_core::serde_json::json;
 use deno_core::serde_json::Value;
 use deno_core::BufVec;
 use deno_core::OpState;
@@ -71,16 +76,58 @@ struct TranspileArgs {
   options: Option<String>,
 }
 
+#[derive(Debug, Serialize)]
+struct RuntimeTranspileEmit {
+  source: String,
+  map: Option<String>,
+}
+
 async fn op_transpile(
   state: Rc<RefCell<OpState>>,
   args: Value,
   _data: BufVec,
 ) -> Result<Value, AnyError> {
-  super::check_unstable2(&state, "Deno.transpile");
+  super::check_unstable2(&state, "Deno.transpileOnly");
   let args: TranspileArgs = serde_json::from_value(args)?;
-  let cli_state = super::global_state2(&state);
-  let program_state = cli_state.clone();
-  let result =
-    runtime_transpile(program_state, &args.sources, &args.options).await?;
+
+  let mut compiler_options = tsc_config::TsConfig::new(json!({
+    "checkJs": true,
+    "emitDecoratorMetadata": false,
+    "jsx": "react",
+    "jsxFactory": "React.createElement",
+    "jsxFragmentFactory": "React.Fragment",
+    "inlineSourceMap": false,
+  }));
+
+  let user_options: HashMap<String, Value> = if let Some(options) = args.options
+  {
+    serde_json::from_str(&options)?
+  } else {
+    HashMap::new()
+  };
+  let maybe_ignored_options =
+    compiler_options.merge_user_config(&user_options)?;
+  // TODO(@kitsonk) these really should just be passed back to the caller
+  if let Some(ignored_options) = maybe_ignored_options {
+    info!("{}: {}", colors::yellow("warning"), ignored_options);
+  }
+
+  let emit_options: ast::EmitOptions = compiler_options.into();
+  let mut emit_map = HashMap::new();
+
+  for (specifier, source) in args.sources {
+    let media_type = MediaType::from(&specifier);
+    let parsed_module = ast::parse(&specifier, &source, &media_type)?;
+    let (source, maybe_source_map) = parsed_module.transpile(&emit_options)?;
+
+    emit_map.insert(
+      specifier.to_string(),
+      RuntimeTranspileEmit {
+        source,
+        map: maybe_source_map,
+      },
+    );
+  }
+  let result = serde_json::to_value(emit_map)?;
   Ok(result)
 }
diff --git a/cli/tests/compiler_api_test.ts b/cli/tests/compiler_api_test.ts
index b4a2f81ef..a845e58c6 100644
--- a/cli/tests/compiler_api_test.ts
+++ b/cli/tests/compiler_api_test.ts
@@ -129,17 +129,16 @@ Deno.test({
   async fn() {
     const actual = await Deno.transpileOnly(
       {
-        "foo.ts": `export enum Foo { Foo, Bar, Baz };\n`,
+        "foo.ts": `/** This is JSDoc */\nexport enum Foo { Foo, Bar, Baz };\n`,
       },
       {
-        sourceMap: false,
-        module: "amd",
+        removeComments: true,
       },
     );
     assert(actual);
     assertEquals(Object.keys(actual), ["foo.ts"]);
-    assert(actual["foo.ts"].source.startsWith("define("));
-    assert(actual["foo.ts"].map == null);
+    assert(!actual["foo.ts"].source.includes("This is JSDoc"));
+    assert(actual["foo.ts"].map);
   },
 });
 
diff --git a/cli/tsc.rs b/cli/tsc.rs
index 796b585fe..7b72e8d36 100644
--- a/cli/tsc.rs
+++ b/cli/tsc.rs
@@ -725,41 +725,6 @@ pub async fn runtime_bundle(
   Ok(serde_json::from_str::<Value>(&json_str).unwrap())
 }
 
-/// This function is used by `Deno.transpileOnly()` API.
-pub async fn runtime_transpile(
-  program_state: Arc<ProgramState>,
-  sources: &HashMap<String, String>,
-  maybe_options: &Option<String>,
-) -> Result<Value, AnyError> {
-  let user_options = if let Some(options) = maybe_options {
-    tsc_config::parse_raw_config(options)?
-  } else {
-    json!({})
-  };
-
-  let mut compiler_options = json!({
-    "esModuleInterop": true,
-    "module": "esnext",
-    "sourceMap": true,
-    "scriptComments": true,
-    "target": "esnext",
-  });
-  tsc_config::json_merge(&mut compiler_options, &user_options);
-
-  let req_msg = json!({
-    "type": CompilerRequestType::RuntimeTranspile,
-    "sources": sources,
-    "compilerOptions": compiler_options,
-  })
-  .to_string();
-
-  let json_str =
-    execute_in_tsc(program_state, req_msg).map_err(extract_js_error)?;
-  let v = serde_json::from_str::<Value>(&json_str)
-    .expect("Error decoding JSON string.");
-  Ok(v)
-}
-
 #[derive(Clone, Debug, PartialEq)]
 pub struct ImportDesc {
   pub specifier: String,
@@ -793,7 +758,7 @@ pub fn pre_process_file(
   analyze_dynamic_imports: bool,
 ) -> Result<(Vec<ImportDesc>, Vec<TsReferenceDesc>), AnyError> {
   let specifier = ModuleSpecifier::resolve_url_or_path(file_name)?;
-  let module = parse(&specifier, source_code, &media_type)?;
+  let module = parse(specifier.as_str(), source_code, &media_type)?;
 
   let dependency_descriptors = module.analyze_dependencies();
 
@@ -894,7 +859,6 @@ fn parse_deno_types(comment: &str) -> Option<String> {
 pub enum CompilerRequestType {
   RuntimeCompile = 2,
   RuntimeBundle = 3,
-  RuntimeTranspile = 4,
 }
 
 impl Serialize for CompilerRequestType {
@@ -905,7 +869,6 @@ impl Serialize for CompilerRequestType {
     let value: i32 = match self {
       CompilerRequestType::RuntimeCompile => 2 as i32,
       CompilerRequestType::RuntimeBundle => 3 as i32,
-      CompilerRequestType::RuntimeTranspile => 4 as i32,
     };
     Serialize::serialize(&value, serializer)
   }
diff --git a/cli/tsc/99_main_compiler.js b/cli/tsc/99_main_compiler.js
index ee03ff6ff..470c1fcee 100644
--- a/cli/tsc/99_main_compiler.js
+++ b/cli/tsc/99_main_compiler.js
@@ -599,7 +599,6 @@ delete Object.prototype.__proto__;
   const CompilerRequestType = {
     RuntimeCompile: 2,
     RuntimeBundle: 3,
-    RuntimeTranspile: 4,
   };
 
   function createBundleWriteFile(state) {
@@ -999,31 +998,6 @@ delete Object.prototype.__proto__;
     };
   }
 
-  function runtimeTranspile(request) {
-    const result = {};
-    const { sources, compilerOptions } = request;
-
-    const parseResult = parseCompilerOptions(
-      compilerOptions,
-    );
-    const options = parseResult.options;
-    // TODO(bartlomieju): this options is excluded by `ts.convertCompilerOptionsFromJson`
-    // however stuff breaks if it's not passed (type_directives_js_main.js, compiler_js_error.ts)
-    options.allowNonTsExtensions = true;
-
-    for (const [fileName, inputText] of Object.entries(sources)) {
-      const { outputText: source, sourceMapText: map } = ts.transpileModule(
-        inputText,
-        {
-          fileName,
-          compilerOptions: options,
-        },
-      );
-      result[fileName] = { source, map };
-    }
-    return result;
-  }
-
   function opCompilerRespond(msg) {
     core.jsonOpSync("op_compiler_respond", msg);
   }
@@ -1041,11 +1015,6 @@ delete Object.prototype.__proto__;
         opCompilerRespond(result);
         break;
       }
-      case CompilerRequestType.RuntimeTranspile: {
-        const result = runtimeTranspile(request);
-        opCompilerRespond(result);
-        break;
-      }
       default:
         throw new Error(
           `!!! unhandled CompilerRequestType: ${request.type} (${
diff --git a/cli/tsc_config.rs b/cli/tsc_config.rs
index c4028dea9..93f269ed3 100644
--- a/cli/tsc_config.rs
+++ b/cli/tsc_config.rs
@@ -2,6 +2,7 @@
 
 use deno_core::error::AnyError;
 use deno_core::serde_json;
+use deno_core::serde_json::json;
 use deno_core::serde_json::Value;
 use jsonc_parser::JsonValue;
 use serde::Deserialize;
@@ -20,6 +21,7 @@ use std::str::FromStr;
 pub struct EmitConfigOptions {
   pub check_js: bool,
   pub emit_decorator_metadata: bool,
+  pub inline_source_map: bool,
   pub jsx: String,
   pub jsx_factory: String,
   pub jsx_fragment_factory: String,
@@ -30,77 +32,82 @@ pub struct EmitConfigOptions {
 #[derive(Debug, Clone, PartialEq)]
 pub struct IgnoredCompilerOptions {
   pub items: Vec<String>,
-  pub path: PathBuf,
+  pub maybe_path: Option<PathBuf>,
 }
 
 impl fmt::Display for IgnoredCompilerOptions {
   fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
     let mut codes = self.items.clone();
     codes.sort();
-
-    write!(f, "Unsupported compiler options in \"{}\".\n  The following options were ignored:\n    {}", self.path.to_string_lossy(), codes.join(", "))
+    if let Some(path) = &self.maybe_path {
+      write!(f, "Unsupported compiler options in \"{}\".\n  The following options were ignored:\n    {}", path.to_string_lossy(), codes.join(", "))
+    } else {
+      write!(f, "Unsupported compiler options provided.\n  The following options were ignored:\n    {}", codes.join(", "))
+    }
   }
 }
 
 /// A static slice of all the compiler options that should be ignored that
 /// either have no effect on the compilation or would cause the emit to not work
 /// in Deno.
-const IGNORED_COMPILER_OPTIONS: [&str; 61] = [
+const IGNORED_COMPILER_OPTIONS: [&str; 10] = [
   "allowSyntheticDefaultImports",
+  "esModuleInterop",
+  "inlineSourceMap",
+  "inlineSources",
+  // TODO(nayeemrmn): Add "isolatedModules" here for 1.6.0.
+  "module",
+  "noLib",
+  "preserveConstEnums",
+  "reactNamespace",
+  "sourceMap",
+  "target",
+];
+
+const IGNORED_RUNTIME_COMPILER_OPTIONS: [&str; 50] = [
   "allowUmdGlobalAccess",
   "assumeChangesOnlyAffectDirectDependencies",
   "baseUrl",
   "build",
   "composite",
   "declaration",
-  "declarationDir",
   "declarationMap",
   "diagnostics",
   "downlevelIteration",
   "emitBOM",
   "emitDeclarationOnly",
-  "esModuleInterop",
   "extendedDiagnostics",
   "forceConsistentCasingInFileNames",
   "generateCpuProfile",
   "help",
   "importHelpers",
   "incremental",
-  "inlineSourceMap",
-  "inlineSources",
   "init",
-  // TODO(nayeemrmn): Add "isolatedModules" here for 1.6.0.
   "listEmittedFiles",
   "listFiles",
   "mapRoot",
   "maxNodeModuleJsDepth",
-  "module",
   "moduleResolution",
   "newLine",
   "noEmit",
   "noEmitHelpers",
   "noEmitOnError",
-  "noLib",
   "noResolve",
   "out",
   "outDir",
   "outFile",
   "paths",
-  "preserveConstEnums",
   "preserveSymlinks",
   "preserveWatchOutput",
   "pretty",
-  "reactNamespace",
   "resolveJsonModule",
   "rootDir",
   "rootDirs",
   "showConfig",
   "skipDefaultLibCheck",
   "skipLibCheck",
-  "sourceMap",
   "sourceRoot",
   "stripInternal",
-  "target",
   "traceResolution",
   "tsBuildInfoFile",
   "types",
@@ -167,6 +174,34 @@ pub fn parse_raw_config(config_text: &str) -> Result<Value, AnyError> {
   Ok(jsonc_to_serde(jsonc))
 }
 
+fn parse_compiler_options(
+  compiler_options: &HashMap<String, Value>,
+  maybe_path: Option<PathBuf>,
+  is_runtime: bool,
+) -> Result<(Value, Option<IgnoredCompilerOptions>), AnyError> {
+  let mut filtered: HashMap<String, Value> = HashMap::new();
+  let mut items: Vec<String> = Vec::new();
+
+  for (key, value) in compiler_options.iter() {
+    let key = key.as_str();
+    if (!is_runtime && IGNORED_COMPILER_OPTIONS.contains(&key))
+      || IGNORED_RUNTIME_COMPILER_OPTIONS.contains(&key)
+    {
+      items.push(key.to_string());
+    } else {
+      filtered.insert(key.to_string(), value.to_owned());
+    }
+  }
+  let value = serde_json::to_value(filtered)?;
+  let maybe_ignored_options = if !items.is_empty() {
+    Some(IgnoredCompilerOptions { items, maybe_path })
+  } else {
+    None
+  };
+
+  Ok((value, maybe_ignored_options))
+}
+
 /// Take a string of JSONC, parse it and return a serde `Value` of the text.
 /// The result also contains any options that were ignored.
 pub fn parse_config(
@@ -176,29 +211,12 @@ pub fn parse_config(
   assert!(!config_text.is_empty());
   let jsonc = jsonc_parser::parse_to_value(config_text)?.unwrap();
   let config: TSConfigJson = serde_json::from_value(jsonc_to_serde(jsonc))?;
-  let mut compiler_options: HashMap<String, Value> = HashMap::new();
-  let mut items: Vec<String> = Vec::new();
 
-  if let Some(in_compiler_options) = config.compiler_options {
-    for (key, value) in in_compiler_options.iter() {
-      if IGNORED_COMPILER_OPTIONS.contains(&key.as_str()) {
-        items.push(key.to_owned());
-      } else {
-        compiler_options.insert(key.to_owned(), value.to_owned());
-      }
-    }
-  }
-  let options_value = serde_json::to_value(compiler_options)?;
-  let ignored_options = if !items.is_empty() {
-    Some(IgnoredCompilerOptions {
-      items,
-      path: path.to_path_buf(),
-    })
+  if let Some(compiler_options) = config.compiler_options {
+    parse_compiler_options(&compiler_options, Some(path.to_owned()), false)
   } else {
-    None
-  };
-
-  Ok((options_value, ignored_options))
+    Ok((json!({}), None))
+  }
 }
 
 /// A structure for managing the configuration of TypeScript
@@ -237,7 +255,7 @@ impl TsConfig {
   ///
   /// When there are options ignored out of the file, a warning will be written
   /// to stderr regarding the options that were ignored.
-  pub fn merge_user_config(
+  pub fn merge_tsconfig(
     &mut self,
     maybe_path: Option<String>,
   ) -> Result<Option<IgnoredCompilerOptions>, AnyError> {
@@ -263,6 +281,19 @@ impl TsConfig {
       Ok(None)
     }
   }
+
+  /// Take a map of compiler options, filtering out any that are ignored, then
+  /// merge it with the current configuration, returning any options that might
+  /// have been ignored.
+  pub fn merge_user_config(
+    &mut self,
+    user_options: &HashMap<String, Value>,
+  ) -> Result<Option<IgnoredCompilerOptions>, AnyError> {
+    let (value, maybe_ignored_options) =
+      parse_compiler_options(user_options, None, true)?;
+    json_merge(&mut self.0, &value);
+    Ok(maybe_ignored_options)
+  }
 }
 
 impl Serialize for TsConfig {
@@ -321,12 +352,44 @@ mod tests {
       ignored,
       Some(IgnoredCompilerOptions {
         items: vec!["build".to_string()],
-        path: config_path,
+        maybe_path: Some(config_path),
       }),
     );
   }
 
   #[test]
+  fn test_tsconfig_merge_user_options() {
+    let mut tsconfig = TsConfig::new(json!({
+      "target": "esnext",
+      "module": "esnext",
+    }));
+    let user_options = serde_json::from_value(json!({
+      "target": "es6",
+      "build": true,
+      "strict": false,
+    }))
+    .expect("could not convert to hashmap");
+    let maybe_ignored_options = tsconfig
+      .merge_user_config(&user_options)
+      .expect("could not merge options");
+    assert_eq!(
+      tsconfig.0,
+      json!({
+        "module": "esnext",
+        "target": "es6",
+        "strict": false,
+      })
+    );
+    assert_eq!(
+      maybe_ignored_options,
+      Some(IgnoredCompilerOptions {
+        items: vec!["build".to_string()],
+        maybe_path: None
+      })
+    );
+  }
+
+  #[test]
   fn test_parse_raw_config() {
     let invalid_config_text = r#"{
       "compilerOptions": {