37 lines
946 B
TypeScript
37 lines
946 B
TypeScript
|
// @allowJs: true
|
||
|
|
// @checkJs: true
|
||
|
|
// @noEmit: true
|
||
|
|
// @strictNullChecks: true
|
||
|
|
// @noImplicitAny: true
|
||
|
|
// @Filename: a.js
|
||
|
|
function Installer () {
|
||
|
|
// arg: number
|
||
|
|
this.arg = 0
|
||
|
|
// unknown: string | boolean | null
|
||
|
|
this.unknown = null
|
||
|
|
// twice: string | undefined
|
||
|
|
this.twice = undefined
|
||
|
|
this.twice = 'hi'
|
||
|
|
// twices: any[] | null
|
||
|
|
this.twices = []
|
||
|
|
this.twices = null
|
||
|
|
}
|
||
|
|
Installer.prototype.first = function () {
|
||
|
|
this.arg = 'hi' // error
|
||
|
|
this.unknown = 'hi' // ok
|
||
|
|
this.newProperty = 1 // ok: number | boolean
|
||
|
|
this.twice = undefined // ok
|
||
|
|
this.twice = 'hi' // ok
|
||
|
|
}
|
||
|
|
Installer.prototype.second = function () {
|
||
|
|
this.arg = false // error
|
||
|
|
this.unknown = false // ok
|
||
|
|
this.newProperty = false // ok
|
||
|
|
this.twice = null // error
|
||
|
|
this.twice = false // error
|
||
|
|
this.twices.push(1) // error: Object is possibly null
|
||
|
|
if (this.twices != null) {
|
||
|
|
this.twices.push('hi')
|
||
|
|
}
|
||
|
|
}
|