feat(placeholders): Add placeholder types, etc.

Author: cartant

source/placeholders-spec.ts

@@ -0,0 +1,27 @@
+/**
+ * @license Use of this source code is governed by an MIT-style license that
+ * can be found in the LICENSE file at https://github.com/cartant/ts-snippet
+ */
+/*tslint:disable:no-unused-expression*/
+
+import { expecter } from "./expecter";
+
+describe("placeholders", () => {
+
+    const expectSnippet = expecter();
+
+    it("should be importable into a snippet", () => {
+
+        const expect = expectSnippet(`
+            import * as placeholders from "./source/placeholders";
+            const assignedConstant = placeholders.c1;
+            let assignedVariable = placeholders.v2;
+            declare const declaredConstant: placeholders.T3;
+            declare let declaredVariable: placeholders.T4;
+        `);
+        expect.toInfer("assignedConstant", "T1");
+        expect.toInfer("assignedVariable", "T2");
+        expect.toInfer("declaredConstant", "T3");
+        expect.toInfer("declaredVariable", "T4");
+    });
+});

source/placeholders.ts

@@ -0,0 +1,43 @@
+/**
+ * @license Use of this source code is governed by an MIT-style license that
+ * can be found in the LICENSE file at https://github.com/cartant/ts-snippet
+ */
+
+export interface T1 { kind: "T1"; }
+export interface T2 { kind: "T2"; }
+export interface T3 { kind: "T3"; }
+export interface T4 { kind: "T4"; }
+export interface T5 { kind: "T5"; }
+export interface T6 { kind: "T6"; }
+export interface T7 { kind: "T7"; }
+export interface T8 { kind: "T8"; }
+export interface T9 { kind: "T9"; }
+export interface T10 { kind: "T10"; }
+export interface T11 { kind: "T11"; }
+export interface T12 { kind: "T12"; }
+
+export declare const c1: T1;
+export declare const c2: T2;
+export declare const c3: T3;
+export declare const c4: T4;
+export declare const c5: T5;
+export declare const c6: T6;
+export declare const c7: T7;
+export declare const c8: T8;
+export declare const c9: T9;
+export declare const c10: T10;
+export declare const c11: T11;
+export declare const c12: T12;
+
+export declare let v1: T1;
+export declare let v2: T2;
+export declare let v3: T3;
+export declare let v4: T4;
+export declare let v5: T5;
+export declare let v6: T6;
+export declare let v7: T7;
+export declare let v8: T8;
+export declare let v9: T9;
+export declare let v10: T10;
+export declare let v11: T11;
+export declare let v12: T12;