pkg/dart2wasm/tool/compile_dev

#!/usr/bin/env bash
# Copyright (c) 2026, the Dart project authors.  Please see the AUTHORS file
# for details. All rights reserved. Use of this source code is governed by a
# BSD-style license that can be found in the LICENSE file.

# Script to compile a Dart program using dart2wasm_dev. Assumes the Dart repo's
# directory structure.

set -e

function follow_links() {
  file="$1"
  while [ -h "$file" ]; do
    # On Mac OS, readlink -f doesn't work.
    file="$(readlink "$file")"
  done
  echo "$file"
}

# Unlike $0, $BASH_SOURCE points to the absolute path of this file.
PROG_NAME="$(follow_links "$BASH_SOURCE")"

# Handle the case where dart-sdk/bin has been symlinked to.
PROG_DIR="$(cd "${PROG_NAME%/*}" ; pwd -P)"
source "$PROG_DIR/utils.sh"

RUN_SRC=0
PLATFORM_FILENAME="$BIN_DIR/dart2wasm_dev_platform.dill"
SNAPSHOT_NAME="dart2wasm_dev"

VM_ARGS=()
DART_FILE=""
OUTPUT_FILE=""
while [ $# -gt 0 ]; do
  case "$1" in
    --src)
      RUN_SRC=1
      shift
      ;;

    --compiler-asserts)
      SNAPSHOT_NAME="dart2wasm_dev_asserts"
      VM_ARGS+=("--enable-asserts")
      shift
      ;;

    *)
      if [ -z "$DART_FILE" ]; then
        DART_FILE="$1"
        shift
      elif [ -z "$OUTPUT_FILE" ]; then
        OUTPUT_FILE="$1"
        shift
      else
        echo "Unexpected argument $1"
        exit 1
      fi
      ;;
  esac
done

if [ -z "$DART_FILE" ] || [ -z "$OUTPUT_FILE" ]; then
  echo "Expected <file.dart> <file.wasm>"
  exit 1
fi

PLATFORM_ARG="--platform=$PLATFORM_FILENAME"
DART2WASM_DEV_AOT_SNAPSHOT="$BIN_DIR/$SNAPSHOT_NAME.snapshot"
DART2WASM_DEV_SRC="$SDK_DIR/pkg/dart2wasm/bin/dart2wasm_dev.dart"

if [ $RUN_SRC -eq 1 ]; then
  exec "$DART" "${VM_ARGS[@]}" "$DART2WASM_DEV_SRC" "$LIBRARIES_JSON_ARG" "$DART_FILE" "$OUTPUT_FILE"
else
  exec "$DART_AOT_RUNTIME" "${VM_ARGS[@]}" "$DART2WASM_DEV_AOT_SNAPSHOT" "$PLATFORM_ARG" "$DART_FILE" "$OUTPUT_FILE"
fi