tauri-workspace/core/tauri/scripts/process-ipc-message-fn.js

// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT

// this is a function and not an iife so use it carefully

(function (message) {
  if (message instanceof ArrayBuffer || ArrayBuffer.isView(message) || Array.isArray(message)) {
    return {
      contentType: 'application/octet-stream',
      data: message
    }
  } else {
    const data = JSON.stringify(message, (_k, val) => {
      if (val instanceof Map) {
        let o = {};
        val.forEach((v, k) => o[k] = v);
        return o;
      } else if (val instanceof Object && '__TAURI_CHANNEL_MARKER__' in val && typeof val.id === 'number') {
        return `__CHANNEL__:${val.id}`
      } else {
        return val;
      }
    })

    return {
      contentType: 'application/json',
      data
    }
  }
})