[WIP] feat: partial support for tsconfig target option

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name         = "oxbuild"
-version      = "0.1.2"
+version      = "0.1.3"
 description  = "Ultra-fast typescript compiler"
 authors      = ["Don Isaac <don@donisaac.dev>"]
 license      = "MIT"
@@ -55,7 +55,7 @@ panic         = "abort"
 # The profile that 'cargo dist' will build with
 [profile.dist]
 inherits = "release"
-lto = "thin"
+lto      = "thin"
 
 # Config for 'cargo dist'
 [workspace.metadata.dist]
@@ -66,7 +66,13 @@ ci = "github"
 # The installers to generate for each app
 installers = ["shell", "powershell", "npm"]
 # Target platforms to build apps for (Rust target-triple syntax)
-targets = ["aarch64-apple-darwin", "x86_64-apple-darwin", "x86_64-unknown-linux-gnu", "x86_64-unknown-linux-musl", "x86_64-pc-windows-msvc"]
+targets = [
+  "aarch64-apple-darwin",
+  "x86_64-apple-darwin",
+  "x86_64-unknown-linux-gnu",
+  "x86_64-unknown-linux-musl",
+  "x86_64-pc-windows-msvc",
+]
 # The archive format to use for windows builds (defaults .zip)
 windows-archive = ".tar.gz"
 # The archive format to use for non-windows builds (defaults .tar.xz)

src/cli.rs

@@ -46,6 +46,7 @@ By default, Oxbuild will look for a tsconfig.json next to the nearest package.js
         .get_matches()
 }
 
+#[derive(Debug)]
 #[non_exhaustive]
 pub struct CliOptions {
     pub root: Root,

src/cli/root.rs

@@ -24,6 +24,12 @@ impl Deref for Root {
     type Target = Path;
 
     fn deref(&self) -> &Self::Target {
+        self.as_ref()
+    }
+}
+
+impl AsRef<Path> for Root {
+    fn as_ref(&self) -> &Path {
         self.root.as_ref().unwrap_or(&self.cwd)
     }
 }

src/compiler/options.rs

@@ -3,25 +3,32 @@ use std::{
     path::{Path, PathBuf},
 };
 
+use oxc::transformer::TransformOptions;
+
 #[derive(Debug, Clone)]
 pub struct CompileOptions {
     root_dir: PathBuf,
     /// Emit .d.ts files using isolatedDeclarations.
     d_ts: bool,
+    transform_options: TransformOptions,
 }
 
 impl Default for CompileOptions {
     fn default() -> Self {
         let cwd = env::current_dir().unwrap();
-        Self::new(cwd)
+        Self::new(cwd, TransformOptions::default())
     }
 }
 
 impl CompileOptions {
-    pub fn new(root_dir: PathBuf) -> Self {
+    pub fn new(root_dir: PathBuf, transform_options: TransformOptions) -> Self {
         assert!(root_dir.is_dir());
         assert!(root_dir.is_absolute());
+
+        debug_assert_eq!(root_dir, transform_options.cwd);
+
         Self {
+            transform_options,
             root_dir,
             d_ts: false,
         }

src/options.rs

@@ -1,14 +1,17 @@
-use crate::cli::{CliOptions, Root};
 use std::{
+    fmt,
     fs::{self},
     num::NonZeroUsize,
     path::PathBuf,
 };
 
 use miette::{IntoDiagnostic, Report, Result, WrapErr};
+use oxc::transformer::TransformOptions;
 // use package_json::{PackageJson, PackageJsonManager};
 use serde::Deserialize;
 
+use crate::cli::{CliOptions, Root};
+
 // use crate::error::AnyError;
 
 pub struct OxbuildOptions {
@@ -20,8 +23,7 @@ pub struct OxbuildOptions {
     /// Path to output folder where compiled code will be written.
     pub dist: PathBuf,
     pub num_threads: NonZeroUsize,
-    // package_json: PackageJson,
-    // tsconfig: Option<PathBuf>, // TODO
+    pub transform_options: TransformOptions,
 }
 
 impl OxbuildOptions {
@@ -71,26 +73,40 @@ impl OxbuildOptions {
         let dist = if let Some(out_dir) = co.and_then(|co| co.out_dir.as_ref()) {
             root.resolve(out_dir)
         } else {
-            let dist = root.join("dist").to_path_buf();
-            if !dist.exists() {
-                fs::create_dir(&dist).into_diagnostic()?;
-            }
-            // TODO: clean dist dir?
-            dist
+            root.join("dist").to_path_buf()
         };
-        assert!(dist.is_dir()); // FIXME: handle errors
+
+        // TODO: clean dist dir?
+        if !dist.exists() {
+            fs::create_dir(&dist).into_diagnostic()?;
+        }
+        if !dist.is_dir() {
+            return Err(Report::msg(format!(
+                "Invalid output directory: '{}' is not a directory",
+                dist.display()
+            )));
+        }
 
         let isolated_declarations = co
             .and_then(|co| co.isolated_declarations)
             // no tsconfig means they're using JavaScript. We can't emit .d.ts files in that case.
             .unwrap_or(false);
 
+        let mut transform_options = tsconfig
+            .as_ref()
+            .map(|tsconfig| tsconfig.transform_options())
+            .transpose()?
+            .unwrap_or_default();
+
+        transform_options.cwd = root.to_path_buf();
+
         Ok(Self {
             root,
             isolated_declarations,
             src,
             dist,
             num_threads,
+            transform_options,
         })
     }
 }
@@ -106,19 +122,94 @@ impl TsConfig {
     }
 }
 
+/// [`compilerOptions`](https://www.typescriptlang.org/tsconfig/#compilerOptions) in a
+/// `tsconfig.json` file.
 #[derive(Debug, Default, Deserialize)]
 #[serde(rename_all = "camelCase")]
 struct TsConfigCompilerOptions {
     // TODO: parse more fields as needed
     root_dir: Option<PathBuf>,
     out_dir: Option<PathBuf>,
     isolated_declarations: Option<bool>,
+    /// https://www.typescriptlang.org/tsconfig/#target
+    #[serde(default)]
+    target: TsConfigTarget,
 }
 
+/// https://www.typescriptlang.org/tsconfig/#target
+#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Deserialize)]
+#[serde(rename_all = "snake_case")] // just needed for lowercasing values
+pub enum TsConfigTarget {
+    /// Not supported by oxc
+    ES3,
+    ES5,
+    /// Same as es2015
+    ES6,
+    /// Same as es6
+    ES2015,
+    ES2016,
+    ES2017,
+    ES2018,
+    ES2019,
+    ES2020,
+    ES2021,
+    ES2022,
+    ES2023,
+    #[default]
+    ESNext,
+}
+impl fmt::Display for TsConfigTarget {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::ESNext => "ESNext".fmt(f),
+            Self::ES2023 => "ES2023".fmt(f),
+            Self::ES2022 => "ES2022".fmt(f),
+            Self::ES2021 => "ES2021".fmt(f),
+            Self::ES2020 => "ES2020".fmt(f),
+            Self::ES2019 => "ES2019".fmt(f),
+            Self::ES2018 => "ES2018".fmt(f),
+            Self::ES2017 => "ES2017".fmt(f),
+            Self::ES2016 => "ES2016".fmt(f),
+            Self::ES2015 => "ES2015".fmt(f),
+            Self::ES6 => "ES6".fmt(f),
+            Self::ES5 => "ES5".fmt(f),
+            Self::ES3 => "ES3".fmt(f),
+        }
+    }
+}
+impl TsConfigTarget {
+    /// Returns [`true`] if this version of ECMAScript is not supported by `oxc_transform`
+    fn is_unsupported(self) -> bool {
+        matches!(self, Self::ES3)
+    }
+}
+
+/// A parsed `tsconfig.json` file.
+///
+/// See: [TSConfig Reference](https://www.typescriptlang.org/tsconfig/)
 impl TsConfig {
     pub fn parse(mut source_text: String) -> Result<Self> {
         json_strip_comments::strip(&mut source_text).unwrap();
 
         serde_json::from_str(&source_text).into_diagnostic()
     }
+
+    pub fn transform_options(&self) -> Result<TransformOptions> {
+        let co = self.compiler_options();
+        let target = co.map(|co| co.target).unwrap_or_default();
+
+        if target.is_unsupported() {
+            return Err(Report::msg(format!(
+                "Oxbuild does not support compiling to {target}. Please use a higher target version.",
+            )));
+        }
+        let mut options = TransformOptions::default();
+
+        // TODO: set presets once TransformOptions supports factories that take a target ECMAScript version
+        if target <= TsConfigTarget::ES2021 {
+            options.es2021.logical_assignment_operators = true
+        }
+
+        Ok(options)
+    }
 }

src/walk.rs

@@ -21,8 +21,12 @@ pub struct WalkerBuilder {
 
 impl WalkerBuilder {
     pub fn new(options: OxbuildOptions, sender: DiagnosticSender) -> Self {
-        let compile_options = CompileOptions::new(options.root.deref().to_path_buf())
-            .with_d_ts(options.isolated_declarations);
+        let compile_options = CompileOptions::new(
+            options.root.deref().to_path_buf(),
+            options.transform_options.clone(),
+        )
+        .with_d_ts(options.isolated_declarations);
+
         Self {
             compile_options: Arc::new(compile_options),
             options: Arc::new(options),