JSDoc property name is not parsed as expected when non-alphanumeric characters are present and intellisense not showing properties

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TypeScript Version: 3.8.0-dev.20200104

Search terms:

• jsdoc / jsdocs
• completionInfo

• VSCode Version: 1.41.1 (user setup)
• OS Version: Windows_NT x64 10.0.17134

Origin of this discovery:
I was trying to document my types which translate to XML classes. The syntax for which includes the "@class" as a property name of my object. This is not possible given the current syntax parsing in VSCode.

Steps to Reproduce:

1. Place this code in the editor with the language as Javascript
   Code:

/**
 * @typedef Foo
 * @property {string} bar Property shows in intellisense
 * @property {string} @baz Property should show in intellisense but does not
 * @property {string} test Property should show in intellisense but does not
 * @property {string} @class Property name "@class" should be a possible property name that
 * does not get interpreted as a JSDoc instruction.
 * @property {string} even#ThisShouldBeAValidName! But the name is not parsed as expeted
 */

/**
 * @type {Foo}
 */
const fooInstance = {
	
}

2. Prompt the intellisense to show within the "fooInstance" object.
   1. Expected: The properties @ baz and @ class should be highlighted like normal property names
      1. Actual: The properties are shown as if they were JSDoc instructions
   2. Expected: The property "even#ThisShouldBeAValidName!" should be highlighted like a normal property name
      1. Actual: The property is highlighted as expected until the "#" symbol and then it seems to be treated like a comment
   3. Expected: Intellisense should show all the properties
      1. Actual: Only the first property "bar" is shown. An empty string "" is shown as if it were another property name.

Does this issue occur when all extensions are disabled?: Yes

まず、この issue のコードサンプルを使って、JavaScript エディターでの JSDoc typedef と completionInfo の動作を再現します。@property の名前がどのように解析され、補完がどのように生成されるかを追跡します。@、#、! を含む名前が保持され、列挙されたすべてのプロパティが IntelliSense に表示されれば完了です。