feat: add declarations for sw-precache-webpack-plugin (#25541)

* feat: add declarations for sw-precache-webpack-plugin

* override type of sw-precache option `importScripts`

types/sw-precache-webpack-plugin/index.d.ts

@@ -0,0 +1,38 @@
+// Type definitions for sw-precache-webpack-plugin 0.11
+// Project: https://github.com/goldhand/sw-precache-webpack-plugin#readme
+// Definitions by: JounQin <https://github.com/JounQin>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
+
+import { Options as SwPrecacheOptions } from 'sw-precache';
+import { Plugin } from 'webpack';
+
+// workaround to override parent types
+interface _Options extends SwPrecacheOptions {
+    importScripts?: any;
+}
+
+declare namespace SWPrecacheWebpackPlugin {
+    interface Options extends _Options {
+        filename?: string;
+        filepath?: string;
+        staticFileGlobsIgnorePatterns?: RegExp[];
+        mergeStaticsConfig?: boolean;
+        minify?: boolean;
+
+        // override sw-precache options
+        importScripts?: Array<
+            | string
+            | {
+                  chunkName?: string;
+                  filename?: string;
+              }
+        >;
+    }
+}
+
+declare class SWPrecacheWebpackPlugin extends Plugin {
+    constructor(options?: SWPrecacheWebpackPlugin.Options);
+}
+
+export = SWPrecacheWebpackPlugin;

types/sw-precache-webpack-plugin/sw-precache-webpack-plugin-tests.ts

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+import { Configuration } from 'webpack';
+import * as SwPrecacheWebpackPlugin from 'sw-precache-webpack-plugin';
+
+let config: Configuration = {
+    plugins: [new SwPrecacheWebpackPlugin()]
+};
+
+config = {
+    plugins: [
+        new SwPrecacheWebpackPlugin({
+            filename: ''
+        })
+    ]
+};
+
+config = {
+    plugins: [
+        new SwPrecacheWebpackPlugin({
+            cacheId: ''
+        })
+    ]
+};
+
+config = {
+    plugins: [
+        new SwPrecacheWebpackPlugin({
+            importScripts: [
+                {
+                    chunkName: ''
+                }
+            ]
+        })
+    ]
+};
+
+export default config;

types/sw-precache-webpack-plugin/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "sw-precache-webpack-plugin-tests.ts"
+    ]
+}

types/sw-precache-webpack-plugin/tslint.json

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+{ "extends": "dtslint/dt.json" }