Cannot create rest type from generic type

[neoncom]

TypeScript Version: 2.8.1 (vs code newest)

Search Terms: rest parameter destructuring generic

Code

Expected behavior: no error (because TA extends A, and A is an object, and rest parameters should work with objects...).

It worked with ts 2.7.2, but NOT with 2.8.1

Actual behavior: see pic

Playground Link: http://www.typescriptlang.org/play/index.html#src=interface%20A%20%7B%7D%0D%0A%0D%0Aclass%20MyClass%3CTA%20extends%20A%3E%7B%0D%0A%20%20%20%20method()%20%7B%0D%0A%20%20%20%20%20%20%20%20const%20a%3A%20A%20%3D%20null%20as%20any%3B%0D%0A%20%20%20%20%20%20%20%20const%20%7B%20...props1%20%7D%20%3D%20a%3B%0D%0A%20%20%20%20%20%20%20%20const%20ab%3A%20TA%20%3D%20null%20as%20any%3B%0D%0A%0D%0A%0D%0A%0D%0A%20%20%20%20%20%20%20%20const%20%7B%20...props2%20%7D%20%3D%20ab%3B%0D%0A%20%20%20%20%7D%0D%0A%7D%0D%0A

Related Issues:

[MartinJohns]

because TA extends A, and A is an object

A doesn't has to be an object.

interface A { }
const a1: A = 5;
const a2: A = true;

It worked with ts 2.7.2

I just tested it with version 2.7.2, and your code does not work there either.

Also it seems to be a duplicate of #10727 and will hopefully someday be implemented with #13288.

[neoncom]

1. interface A { bla: 3; } does not work either. and that is an object. If something extends that interface, it is an object, too. So yes, it is a bug :)
2. it worked with ts 2.7.1. 2.7.2 was incorrect,. sorry.

and:

interface {}

can be an object, but

interface { property:number; }

must be an object. did not believe it. but it is true. you're right

a novice would just a assume that case 1 is an object without a property. and i am no novice (in TS)

for me something like this can be an object:

{ prop: number; } | number | string

I'm gonna post my tsconfig, just in case it you test it in 2.7.1 and it work's there too (it shoud not)

{
	"extends": "../tsconfig.base",
	"compileOnSave": true,
	"compilerOptions": {
		"allowSyntheticDefaultImports": true, // for shallowequal package
		"module": "esnext",
		"lib": [
			"es2015",
			"dom",
			"esnext.asynciterable"
		],
		"stripInternal": true,
		"forceConsistentCasingInFileNames": true,
		"experimentalDecorators": true,
		"outDir": "../build",
		"noEmitHelpers": true,
		"importHelpers": true,
		"jsx": "react",
		"typeRoots": [
			"../../node_modules/@types",
			"../types"
		],
		"baseUrl": ".",
		"paths": {
			"@components/*": [
				"components/*"
			],
			"@lib/*": [
				"lib/*"
			],
			"@common/*": [
				"common/*"
			],
			"@redux/*": [
				"redux/*"
			],
			"@services/*": [
				"services/*"
			],
			"@translations/*": [
				"translations/*"
			],
			"@serverApi/*": [
				"server-api/*"
			]
		},
		"strictFunctionTypes": false
	},
	"include": [
		"**/*.ts",
		"**/*.tsx"
	]
}

it extends this:

{
    "compilerOptions": {
        "strict": true,
        "moduleResolution": "node",
        "removeComments": true,
        "target": "ES6"
    }
}

[typescript-bot]

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