Inferred default parameter is erroneous using "typedef" "parameter"

[cfischer]

Bug Report

• TSLint version: 3.10.2
• TypeScript version: 1.8.10
• Running TSLint via: Visual Studio Code

TypeScript code being linted

class C {
  fn(str = '') {
  }
}

or

class C {
  fn(str: string = '') {
  }
}

with tslint.json:

{
  "rules": {
    "typedef": [
      true,
      "parameter"
    ],
    "no-inferrable-types": true
  }
}

Actual behavior

You either get "LHS type (string) inferred by RHS expression, remove type annotation" or "expected parameter: 'str' to have a typedef"

Expected behavior

To not get "expected parameter: 'str' to have a typedef" if you specified a inferable default parameter value.

[jkillian]

Yes, this is an issue unfortunately. See #711 and #739