Add test for emit destructuring invariable declaration with omitted expression

Author: Yui T

tests/baselines/reference/declarationEmitDestructuringArrayPattern5.js

@@ -0,0 +1,15 @@
+//// [declarationEmitDestructuringArrayPattern5.ts]
+var [, , z] = [1, 2, 4];
+var [, a, , ] = [3, 4, 5];
+var [, , [, b, ]] = [3,5,[0, 1]];
+
+//// [declarationEmitDestructuringArrayPattern5.js]
+var _a = [1, 2, 4], z = _a[2];
+var _b = [3, 4, 5], a = _b[1];
+var _c = [3, 5, [0, 1]], _d = _c[2], b = _d[1];
+
+
+//// [declarationEmitDestructuringArrayPattern5.d.ts]
+declare var z: number;
+declare var a: number;
+declare var b: number;

tests/baselines/reference/declarationEmitDestructuringArrayPattern5.types

@@ -0,0 +1,14 @@
+=== tests/cases/compiler/declarationEmitDestructuringArrayPattern5.ts ===
+var [, , z] = [1, 2, 4];
+>z : number
+>[1, 2, 4] : [number, number, number]
+
+var [, a, , ] = [3, 4, 5];
+>a : number
+>[3, 4, 5] : [number, number, number]
+
+var [, , [, b, ]] = [3,5,[0, 1]];
+>b : number
+>[3,5,[0, 1]] : [number, number, [number, number]]
+>[0, 1] : [number, number]
+

tests/cases/compiler/declarationEmitDestructuringArrayPattern5.ts

@@ -0,0 +1,4 @@
+// @declaration: true
+var [, , z] = [1, 2, 4];
+var [, a, , ] = [3, 4, 5];
+var [, , [, b, ]] = [3,5,[0, 1]];