refactor: convert more files to typescript (#16820)

lib/common/init.ts

@@ -0,0 +1,65 @@
+import * as timers from 'timers'
+import * as util from 'util'
+
+import { atomBindingSetup } from '@electron/internal/common/atom-binding-setup'
+
+process.atomBinding = atomBindingSetup(process.binding, process.type)
+
+type AnyFn = (...args: any[]) => any
+
+// setImmediate and process.nextTick makes use of uv_check and uv_prepare to
+// run the callbacks, however since we only run uv loop on requests, the
+// callbacks wouldn't be called until something else activated the uv loop,
+// which would delay the callbacks for arbitrary long time. So we should
+// initiatively activate the uv loop once setImmediate and process.nextTick is
+// called.
+const wrapWithActivateUvLoop = function <T extends AnyFn> (func: T): T {
+  return wrap(func, function (func) {
+    return function (this: any, ...args: any[]) {
+      process.activateUvLoop()
+      return func.apply(this, args)
+    }
+  }) as T
+}
+
+/**
+ * Casts to any below for func are due to Typescript not supporting symbols
+ * in index signatures
+ *
+ * Refs: https://github.com/Microsoft/TypeScript/issues/1863
+ */
+function wrap <T extends AnyFn> (func: T, wrapper: (fn: AnyFn) => T) {
+  const wrapped = wrapper(func)
+  if ((func as any)[util.promisify.custom]) {
+    (wrapped as any)[util.promisify.custom] = wrapper((func as any)[util.promisify.custom])
+  }
+  return wrapped
+}
+
+process.nextTick = wrapWithActivateUvLoop(process.nextTick)
+
+global.setImmediate = wrapWithActivateUvLoop(timers.setImmediate)
+global.clearImmediate = timers.clearImmediate
+
+if (process.type === 'browser') {
+  // setTimeout needs to update the polling timeout of the event loop, when
+  // called under Chromium's event loop the node's event loop won't get a chance
+  // to update the timeout, so we have to force the node's event loop to
+  // recalculate the timeout in browser process.
+  global.setTimeout = wrapWithActivateUvLoop(timers.setTimeout)
+  global.setInterval = wrapWithActivateUvLoop(timers.setInterval)
+}
+
+if (process.platform === 'win32') {
+  // Always returns EOF for stdin stream.
+  const { Readable } = require('stream')
+  const stdin = new Readable()
+  stdin.push(null)
+  Object.defineProperty(process, 'stdin', {
+    configurable: false,
+    enumerable: true,
+    get () {
+      return stdin
+    }
+  })
+}