feat(karma-remap-coverage): type definition for v0.1 (#42304)

- type definition
- tests

Thanks!

types/karma-remap-coverage/index.d.ts

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+// Type definitions for karma-remap-coverage 0.1
+// Project: https://github.com/sshev/karma-remap-coverage#readme
+// Definitions by: Piotr Błażejewicz (Peter Blazejewicz) <https://github.com/peterblazejewicz>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.2
+
+/// <reference types="karma-coverage" />
+
+import 'karma';
+
+declare module 'karma' {
+    interface ConfigOptions {
+        /**
+         * Key-value pairs where key is report type and value - path to file/dir where to save it.
+         * Reporters like `text-summary`, `text-lcov` and `teamcity` can print out to console as well
+         * - in this case just provide any falsy value instead of path.
+         *
+         * @example
+         * ```ts
+         * 'text-summary': null, // to show summary in console
+         * html: './coverage/html',
+         * ```
+         *
+         * {@link https://github.com/sshev/karma-remap-coverage#remapcoveragereporter-format }
+         */
+        remapCoverageReporter?: KarmaRemapCoverageReporter;
+    }
+
+    // remapped reporter types to key-value pairs
+    type KarmaRemapCoverageReporter = Partial<Record<ReporterType, string | null | undefined>>;
+}

types/karma-remap-coverage/karma-remap-coverage-tests.ts

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+import { Config } from 'karma';
+
+module.exports = (config: Config) =>
+    config.set({
+        files: ['./entry-module.spec.ts'],
+        preprocessors: {
+            './entry-module.spec.ts': ['webpack', 'sourcemap'],
+            './entry-module.ts': ['coverage'],
+        },
+        // add both "karma-coverage" and "karma-remap-coverage" reporters
+        reporters: ['progress', 'coverage', 'remap-coverage'],
+
+        // save interim raw coverage report in memory
+        coverageReporter: {
+            type: 'in-memory',
+        },
+
+        // define where to save final remaped coverage reports
+        remapCoverageReporter: {
+            'text-summary': null,
+            lcov: undefined,
+            html: './coverage/html',
+            cobertura: './coverage/cobertura.xml',
+        },
+
+        // make sure both reporter plugins are loaded
+        plugins: ['karma-coverage', 'karma-remap-coverage'],
+    });

types/karma-remap-coverage/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",
+        "karma-remap-coverage-tests.ts"
+    ]
+}

types/karma-remap-coverage/tslint.json

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