Block scoped variable usage

[Truedrog]

TypeScript Version: 2.1.1 / 2.2

Code

export function createMuiTheme(config = {} as any) {

  const {
    palette = createPalette(),
    breakpoints = createBreakpoints(),
    mixins = createMixins(breakpoints),
    typography = createTypography(palette),
    ...more
  } = config as any;

...
}

Expected behavior:
Compile without error.
Actual behavior:
TS2448:Block-scoped variable 'breakpoints' used before its declaration.

[RyanCavanaugh]

Similar repro from #12653 except using an array:

const [a, b = a] = [1]; // Block-scoped variable 'a' used before its declaration.
(function ([a, b = a]) { // Initializer of parameter 'b' cannot reference identifier 'a' declared after it.

})([1])

[evil-shrike]

I've updated my project from TS 2.1.4 to 2.2.1 and start getting this error TS2448 in code which was compiling without errors before.

class SlickObjectListDataPresenter extends Part implements IObjectListDataPresenter {
	static defaultOptions: Options = {
		columnRoles: {
			command: {
				width: 100,
				sortable: false,
				cssClass: "x-slick-cell-command",
				formatter: SlickObjectListDataPresenter.prototype.identityFormatter
			},
		},
	};

	protected identityFormatter(row: number, cell: number, value: any, columnDef: GridColumn, dataItem: any): any {
		return value;
	}
}

This formatter: SlickObjectListDataPresenter.prototype.identityFormatter causes compile error (TS2448):

Error:(90, 55) TS2448:Block-scoped variable 'identityFormatter' used before its declaration.

[RyanCavanaugh]

@evil-shrike logged #14580