tests/cases/conformance/salsa/npm-install.js(7,9): error TS2322: Type '"hi"' is not assignable to type 'number'.


==== tests/cases/conformance/salsa/npm-install.js (1 errors) ====
    function Installer () {
        this.args = 0
    }
    Installer.prototype.loadArgMetadata = function (next) {
        // ArrowFunction isn't treated as a this-container
        (args) => {
            this.args = 'hi'
            ~~~~~~~~~
!!! error TS2322: Type '"hi"' is not assignable to type 'number'.
            this.newProperty = 1
        }
    }
    var i = new Installer()
    i.newProperty = i.args // ok, number ==> number | undefined
    