pkg/dart2wasm/tool/run_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 run a program compiled using dart2wasm_dev. Assumes the Dart repo's
# directory structure.
#
# This is also used by the test runner.

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_WASM_DEV="$SDK_DIR/pkg/dart2wasm/bin/run_wasm_dev.js"
DEV_RT_MJS="$BIN_DIR/wasm_dev_rt.mjs"
DEV_RT_WASM="$BIN_DIR/wasm_dev_rt.wasm"

SHELL_BIN="$D8_BIN"
SHELL_OPTIONS=()
SHELL_ARG_SEPERATOR="--"
WASM_FILE=""
EXTRA_JS_FILES=()
while [ $# -gt 0 ]; do
  case "$1" in
    --d8)
      SHELL_BIN="$D8_BIN"
      SHELL_ARG_SEPERATOR="--"
      shift
      ;;

    --jsshell)
      SHELL_BIN="$JSSHELL_BIN"
      SHELL_ARG_SEPERATOR=""
      shift
      ;;

    --jsc)
      SHELL_BIN="$JSC_BIN"
      SHELL_ARG_SEPERATOR="--"
      shift
      ;;

    --shell-option=*)
      SHELL_OPTIONS+=("${1#--shell-option=}")
      shift
      ;;

    *.js)
      EXTRA_JS_FILES+=("$1")
      shift
      ;;

    *.wasm)
      WASM_FILE="$(get_realpath "$1")"
      shift
      ;;

    *)
      # Any arguments that are not the above will be arguments to the dart's
      # main function.
      break
      ;;
  esac
done

exec "$SHELL_BIN" "${SHELL_OPTIONS[@]}" "${EXTRA_JS_FILES[@]}" "$RUN_WASM_DEV" $SHELL_ARG_SEPERATOR "$DEV_RT_MJS" "$DEV_RT_WASM" "$WASM_FILE" -- "$@"