TypeScript/tests/baselines/reference/typeFromPropertyAssignment22.types at e2941c8f05053cd0d31ad6a237b1e5badf99e236 · microsoft/TypeScript · GitHub

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=== tests/cases/conformance/salsa/npm-install.js ===
function Installer () {
>Installer : () => void

    this.args = 0
>this.args = 0 : 0
>this.args : any
>this : any
>args : any
>0 : 0
}
Installer.prototype.loadArgMetadata = function (next) {
>Installer.prototype.loadArgMetadata = function (next) {    // ArrowFunction isn't treated as a this-container    (args) => {        this.args = 'hi'        this.newProperty = 1    }} : (next: any) => void
>Installer.prototype.loadArgMetadata : any
>Installer.prototype : any
>Installer : () => void
>prototype : any
>loadArgMetadata : any
>function (next) {    // ArrowFunction isn't treated as a this-container    (args) => {        this.args = 'hi'        this.newProperty = 1    }} : (next: any) => void
>next : any

    // ArrowFunction isn't treated as a this-container
    (args) => {
>(args) => {        this.args = 'hi'        this.newProperty = 1    } : (args: any) => void
>args : any

        this.args = 'hi'
>this.args = 'hi' : "hi"
>this.args : string | number
>this : { args: string | number; loadArgMetadata: (next: any) => void; newProperty: number | undefined; }
>args : string | number
>'hi' : "hi"

        this.newProperty = 1
>this.newProperty = 1 : 1
>this.newProperty : number | undefined
>this : { args: string | number; loadArgMetadata: (next: any) => void; newProperty: number | undefined; }
>newProperty : number | undefined
>1 : 1
    }
}
var i = new Installer()
>i : { args: string | number; loadArgMetadata: (next: any) => void; newProperty: number | undefined; }
>new Installer() : { args: string | number; loadArgMetadata: (next: any) => void; newProperty: number | undefined; }
>Installer : () => void

i.newProperty = i.args // error, number | string =/> number | undefined
>i.newProperty = i.args : string | number
>i.newProperty : number | undefined
>i : { args: string | number; loadArgMetadata: (next: any) => void; newProperty: number | undefined; }
>newProperty : number | undefined
>i.args : string | number
>i : { args: string | number; loadArgMetadata: (next: any) => void; newProperty: number | undefined; }
>args : string | number