feat: upgrade TypeScript version to 3.1.3

BREAKING CHANGE: TypeScript version 2.7.2 changed to 3.1.3

gulpfile.ts

@@ -17,6 +17,7 @@ enum TestOutput {
 }
 
 @TSGulp.Project('DataSource')
+// @ts-ignore: Allow unused class
 class GulpFile {
     public readonly tsProject = typescript.createProject('./src/tsconfig.json');
     public readonly tsLintProgram = TSlint.Linter.createProgram('./src/tsconfig.json');

package.json

@@ -54,7 +54,7 @@
         "stream-to-promise": "^2.2.0",
         "tsgulp": "^1.1.2",
         "tslint": "^5.10.0",
-        "typescript": "~2.7.2"
+        "typescript": "^3.1.3"
     },
     "dependencies": {
         "tslib": "^1.9.3"

src/processors/complex.spec.ts

@@ -3,6 +3,7 @@ import { ComplexProcessor } from './complex';
 import { SimpleProcessor } from './simple';
 
 class TestableComplexProcessor<T> extends ComplexProcessor<T> {
+    // @ts-ignore: Allow unused parameter
     protected processor(data: T): T {
         throw new Error('Method not implemented.');
     }

src/utils.ts

@@ -30,7 +30,8 @@ export type Finder<T> = (item: T, index: number, array: T[]) => boolean;
 export function find<T>(array: T[], item: T): T | undefined;
 export function find<T>(array: T[], finder: Finder<T>): T | undefined;
 export function find<T>(array: T[], itemOrFinder: T | Finder<T>) {
-    const finder: Finder<T> = typeof itemOrFinder === 'function' ? itemOrFinder : item => item === itemOrFinder;
+    const finder: Finder<T> =
+        typeof itemOrFinder === 'function' ? <Finder<T>>itemOrFinder : item => item === itemOrFinder;
 
     for (let i = 0; i < array.length; i++) {
         if (finder(array[i], i, array)) {
@@ -44,7 +45,8 @@ export function find<T>(array: T[], itemOrFinder: T | Finder<T>) {
 export function findIndex<T>(array: T[], item: T): number;
 export function findIndex<T>(array: T[], finder: Finder<T>): number;
 export function findIndex<T>(array: T[], itemOrFinder: T | Finder<T>) {
-    const finder: Finder<T> = typeof itemOrFinder === 'function' ? itemOrFinder : item => item === itemOrFinder;
+    const finder: Finder<T> =
+        typeof itemOrFinder === 'function' ? <Finder<T>>itemOrFinder : item => item === itemOrFinder;
 
     for (let i = 0; i < array.length; i++) {
         if (finder(array[i], i, array)) {

tsconfig.json

@@ -1,19 +1,21 @@
 {
     "compilerOptions": {
         "alwaysStrict": true,
+        "declaration": true,
         "esModuleInterop": true,
         "experimentalDecorators": true,
+        "importHelpers": true,
         "module": "commonjs",
+        "moduleResolution": "node",
         "noImplicitAny": true,
         "noImplicitReturns": true,
         "noImplicitThis": true,
+        "noUnusedLocals": true,
+        "noUnusedParameters": true,
         "strict": true,
         "strictFunctionTypes": true,
         "strictNullChecks": true,
-        "declaration": true,
         "strictPropertyInitialization": true,
-        "importHelpers": true,
-        "moduleResolution": "node",
         "target": "es6"
     },
     "include": ["gulpfile.ts"]