feat(progress-bar-webpack-plugin): new type definition (#43069)

- definition file
- tests

https://github.com/clessg/progress-bar-webpack-plugin#readme
https://github.com/clessg/progress-bar-webpack-plugin#options

Thanks!

types/progress-bar-webpack-plugin/index.d.ts

@@ -0,0 +1,44 @@
+// Type definitions for progress-bar-webpack-plugin 2.1
+// Project: https://github.com/clessg/progress-bar-webpack-plugin#readme
+// Definitions by: Piotr Błażejewicz (Peter Blazejewicz) <https://github.com/peterblazejewicz>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+import * as ProgressBar from 'progress';
+import { Plugin } from 'webpack';
+
+export = ProgressBarPlugin;
+
+declare namespace ProgressBarPlugin {
+    interface Options extends ProgressBar.ProgressBarOptions {
+        /**
+         * the format of the progress bar
+         * @default ':bar'
+         */
+        format?: string;
+        /**
+         * optional function to call when the progress bar completes
+         */
+        callback?: () => void;
+        /**
+         * option to show summary of time taken
+         * @default true
+         */
+        summary?: boolean;
+        /**
+         * custom summary message if summary option is false
+         */
+        summaryContent?: boolean;
+        /**
+         * function to display a custom summary
+         * (passed build time)
+         */
+        customSummary?: (summary: string) => void;
+    }
+}
+
+/**
+ * A progress bar plugin for Webpack.
+ */
+declare class ProgressBarPlugin extends Plugin {
+    constructor(options?: ProgressBarPlugin.Options);
+}

types/progress-bar-webpack-plugin/progress-bar-webpack-plugin-tests.ts

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+import ProgressBarPlugin = require('progress-bar-webpack-plugin');
+import webpack = require('webpack');
+
+const configuration: webpack.Configuration = {
+    plugins: [
+        new ProgressBarPlugin({
+            total: 10,
+            format: `  build [:bar] ... (:elapsed seconds)`,
+            clear: false,
+            callback: () => {
+                console.log('done');
+            },
+            complete: '=',
+            curr: 2,
+            incomplete: ' ',
+            width: 20,
+            customSummary: summary => {
+                console.log(summary);
+                // rest of the code ...
+            },
+        }),
+    ],
+};
+webpack(configuration);

types/progress-bar-webpack-plugin/tsconfig.json

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

types/progress-bar-webpack-plugin/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }