bundler: bundle template-literal require()/import() via a __glob lookup map

src/ast/runtime.rs

@@ -175,10 +175,11 @@ pub struct Imports {
     pub __promiseAll: Ref,
     pub __MEMO_CACHE_SENTINEL: Ref,
     pub __EARLY_RETURN_SENTINEL: Ref,
+    pub __glob: Ref,
 }
 
 impl Imports {
-    pub const ALL: [&'static [u8]; 27] = [
+    pub const ALL: [&'static [u8]; 28] = [
         b"__name",
         b"__require",
         b"__export",
@@ -206,12 +207,13 @@ impl Imports {
         b"__promiseAll",
         b"__MEMO_CACHE_SENTINEL",
         b"__EARLY_RETURN_SENTINEL",
+        b"__glob",
     ];
 
     /// Rust stable cannot sort in `const`; precomputed here and verified by
     /// the test in `tests` below.
     #[cfg_attr(not(test), allow(dead_code))]
-    const ALL_SORTED: [&'static [u8]; 27] = [
+    const ALL_SORTED: [&'static [u8]; 28] = [
         b"$$typeof",
         b"__EARLY_RETURN_SENTINEL",
         b"__MEMO_CACHE_SENTINEL",
@@ -222,6 +224,7 @@ impl Imports {
         b"__export",
         b"__exportDefault",
         b"__exportValue",
+        b"__glob",
         b"__jsonParse",
         b"__legacyDecorateClassTS",
         b"__legacyDecorateParamTS",
@@ -243,34 +246,35 @@ impl Imports {
 
     /// When generating the list of runtime imports, we sort it for determinism.
     /// This is a lookup table so we don't need to resort the strings each time
-    pub const ALL_SORTED_INDEX: [usize; 27] = [
-        15, // __name
-        24, // __require
+    pub const ALL_SORTED_INDEX: [usize; 28] = [
+        16, // __name
+        25, // __require
         7,  // __export
-        23, // __reExport
+        24, // __reExport
         9,  // __exportValue
         8,  // __exportDefault
-        14, // __merge
-        11, // __legacyDecorateClassTS
-        12, // __legacyDecorateParamTS
-        13, // __legacyMetadataTS
-        22, // __publicField
-        18, // __privateIn
-        17, // __privateGet
-        16, // __privateAdd
-        20, // __privateSet
-        19, // __privateMethod
+        15, // __merge
+        12, // __legacyDecorateClassTS
+        13, // __legacyDecorateParamTS
+        14, // __legacyMetadataTS
+        23, // __publicField
+        19, // __privateIn
+        18, // __privateGet
+        17, // __privateAdd
+        21, // __privateSet
+        20, // __privateMethod
         6,  // __decoratorStart
         5,  // __decoratorMetadata
-        25, // __runInitializers
+        26, // __runInitializers
         4,  // __decorateElement
         0,  // $$typeof
-        26, // __using
+        27, // __using
         3,  // __callDispose
-        10, // __jsonParse
-        21, // __promiseAll
+        11, // __jsonParse
+        22, // __promiseAll
         2,  // __MEMO_CACHE_SENTINEL
         1,  // __EARLY_RETURN_SENTINEL
+        10, // __glob
     ];
 
     pub const NAME: &'static [u8] = b"bun:wrap";
@@ -306,6 +310,7 @@ impl Imports {
             24 => self.__promiseAll,
             25 => self.__MEMO_CACHE_SENTINEL,
             26 => self.__EARLY_RETURN_SENTINEL,
+            27 => self.__glob,
             _ => return None,
         };
         r.to_nullable()
@@ -341,6 +346,7 @@ impl Imports {
             24 => Some(&mut self.__promiseAll),
             25 => Some(&mut self.__MEMO_CACHE_SENTINEL),
             26 => Some(&mut self.__EARLY_RETURN_SENTINEL),
+            27 => Some(&mut self.__glob),
             _ => None,
         }
     }

src/bundler/ParseTask.rs

@@ -2412,6 +2412,7 @@ pub mod parse_worker {
         // a worker-owned `Transpiler` that outlives the parse.
         // SAFETY: ARENA — `topts` outlives `opts` (worker-owned for the bundle pass).
         opts.allow_unresolved = unsafe { bun_collections::detach_ref(&topts.allow_unresolved) };
+        opts.glob_resolver = Some(crate::options::parser_glob_resolver);
         // `Transpiler.macro_context` is `Option<bun_ast::Macro::MacroContext>`
         // (same nominal type as `ParserOptions.macro_context`'s pointee). Reborrow
         // through the raw `*mut Transpiler` so the `&mut MacroContext` is disjoint

src/bundler/options.rs

@@ -77,6 +77,48 @@
 // `&transpiler.options.allow_unresolved` straight through.
 pub use bun_js_parser::options::AllowUnresolved;
 
+/// `glob_resolver` for the parser's esbuild-style template-literal
+/// `require()` / `import()` support. Walks `source_dir` for files matching
+/// `pattern` and returns each match as a relative specifier with the same
+/// `./` / `../` prefix as `pattern`, so the string the bundler records as
+/// an import path is also the string the emitted `__glob({...})` map is
+/// keyed on.
+pub fn parser_glob_resolver(source_dir: &[u8], pattern: &[u8]) -> Vec<Box<[u8]>> {
+    let mut out: Vec<Box<[u8]>> = Vec::new();
+    if !(pattern.starts_with(b"./") || pattern.starts_with(b"../")) {
+        return out;
+    }
+
+    let walker = match bun_glob::BunGlobWalker::init_with_cwd(
+        pattern, source_dir, /* dot */ true, /* absolute */ false,
+        /* follow_symlinks */ true, /* error_on_broken_symlinks */ false,
+        /* only_files */ true, None,
+    ) {
+        Ok(Ok(w)) => w,
+        _ => return out,
+    };
+    let mut walker = Box::new(walker);
+    let mut iter = bun_glob::walk::Iterator::new(&mut *walker);
+    if iter.init().map(|m| m.is_err()).unwrap_or(true) {
+        return out;
+    }
+    while let Ok(Ok(Some(m))) = iter.next() {
+        let p: &[u8] = &m;
+        // The walker is free to return either separator; normalise to `/` so
+        // map keys match the template literal's runtime value on every
+        // platform.
+        let mut s: Vec<u8> = p
+            .iter()
+            .map(|&b| if b == b'\\' { b'/' } else { b })
+            .collect();
+        if !(s.starts_with(b"./") || s.starts_with(b"../")) {
+            s.splice(0..0, b"./".iter().copied());
+        }
+        out.push(s.into_boxed_slice());
+    }
+    out
+}
+
 // Canonical defs live in `bun_resolver::options` (lower tier; resolver is the
 // runtime consumer of `.patterns`/`.abs_paths`/`.node_modules`). Re-export so
 // `BundleOptions.external` and `Resolver.opts.external` are the SAME nominal

src/bundler/transpiler.rs

@@ -1550,6 +1550,7 @@ impl<'a> Transpiler<'a> {
                     macro_context: None,
                     warn_about_unbundled_modules: !target.is_bun(),
                     allow_unresolved: &p_opts::AllowUnresolved::DEFAULT,
+                    glob_resolver: None,
                     module_type: to_parser_module_type(this_parse.module_type),
                     output_format: p_opts::Format::Esm,
                     transform_only: self.options.transform_only,