[TS] Bundle ICU data

Cargo.toml

@@ -325,6 +325,9 @@ uuid = { version = "1.18.1", default-features = false }
 # When updating the V8 crate, either update the version and hashes in that file,
 # or ping phoebe @gefjon to do so.
 v8 = "=145.0.0"
+# This version is kept in sync with the version of ICU required by v8.
+# When that changes, the `v8::icu::set_common_data_XX()` function is renamed.
+deno_core_icudata = "0.77"
 
 walkdir = "2.2.5"
 wasmbin = "0.6"

crates/core/Cargo.toml

@@ -51,6 +51,7 @@ bytestring.workspace = true
 chrono.workspace = true
 crossbeam-channel.workspace = true
 crossbeam-queue.workspace = true
+deno_core_icudata.workspace = true
 derive_more.workspace = true
 dirs.workspace = true
 enum-as-inner.workspace = true

crates/core/src/host/v8/mod.rs

@@ -104,6 +104,13 @@ impl V8RuntimeInner {
     ///
     /// Should only be called once but it isn't unsound to call it more times.
     fn init() -> Self {
+        // If the number in the name of this function is changed, update the version
+        // of the `deno_core_icudata` dep to match the number in the function name.
+        v8::icu::set_common_data_77(deno_core_icudata::ICU_DATA).ok();
+        // Set a default locale for functions like `toLocaleString()`.
+        // en-001 is "International English". <https://www.ctrl.blog/entry/en-001.html>
+        v8::icu::set_default_locale("en-001");
+
         // We don't want idle tasks nor background worker tasks,
         // as we intend to run on a single core.
         // Per the docs, `new_single_threaded_default_platform` requires