feat: Add typings for esm (#41293)

Signed-off-by: Richie Bendall <richiebendall@gmail.com>

types/esm/esm-tests.ts

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+import esm = require("esm");
+
+esm(exports); // $ExpectType Require

types/esm/index.d.ts

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+// Type definitions for esm 3.2
+// Project: https://github.com/standard-things/esm#readme
+// Definitions by: Richie Bendall <https://github.com/Richienb>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node"/>
+
+declare namespace Options {
+    interface Esm {
+        cache: boolean;
+        esModule: boolean;
+        extensions: boolean;
+        mutableNamespace: boolean;
+        namedExports: boolean;
+        paths: boolean;
+        vars: boolean;
+        dedefault: boolean;
+        topLevelReturn: boolean;
+    }
+
+    interface Options {
+        cjs: boolean | Partial<Esm>;
+        mainFields: string[];
+        mode: "auto" | "all" | "strict";
+        await: boolean;
+        force: boolean;
+        wasm: boolean;
+    }
+}
+
+declare function esm(mod: typeof module, options?: Partial<Options.Options>): typeof require;
+export = esm;

types/esm/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",
+        "esm-tests.ts"
+    ]
+}

types/esm/tslint.json

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