jsdoc: defining object format with @typedef then using it with @type doesn't seem to work

[balupton]

TypeScript Version: 2.3.2

Code

example repository: https://github.com/balupton/typescript-typedef-object-issue

source/index.js:

'use strict'

/**
 * @typedef {Object.<string, function(*):boolean>} TypeMap
 */

/**
 * Get the type of the value in lowercase
 * @param {*} value
 * @param {TypeMap} [customTypeMap] a custom type map
 * @returns {?string}
 */
function getType (value, customTypeMap) {
   // Cycle through our type map
   for (const key in customTypeMap) {
      if (customTypeMap.hasOwnProperty(key)) {
         if (customTypeMap[key](value)) {
            return key
         }
      }
   }

   // No type was successful
   return null
}

/**
 * Get the type of the value in lowercase
 * @param {*} value
 * @param {Object.<string, function(*):boolean>} [customTypeMap] a custom type map
 * @returns {?string}
 */
function getTypeWorkaround (value, customTypeMap) {
   // Cycle through our type map
   for (const key in customTypeMap) {
      if (customTypeMap.hasOwnProperty(key)) {
         if (customTypeMap[key](value)) {
            return key
         }
      }
   }

   // No type was successful
   return null
}

tsconfig.json:

{
   "include": [
      "source/*"
   ],
   "compileOnSave": true,
   "compilerOptions": {
      "allowJs": true,
      "checkJs": true,
      "strict": true,
      "alwaysStrict": true,
      "module": "commonjs",
      "newLine": "LF",
      "target": "es2015",
      "outDir": "es2015",
      "lib": [
         "esnext"
      ],
      "rootDir": ".",
      "rootDirs": [
         "."
      ]
   }
}

Expected behavior:
Expected that getType would use the TypeMap type definition correctly.

Actual behavior:
I get this error message on compile:

> tsc

source/index.js(17,14): error TS7017: Element implicitly has an 'any' type because type '{}' has no index signature.

VSCode Screenshots:

[mhegazy]

looks like a duplicate of #15105

[mhegazy]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.