[es6template] Add es6template types (#47959)

* Init

* Finish

* Do it like that

* Update types/es6template/index.d.ts

Co-authored-by: Sheetal Nandi <shkamat@microsoft.com>

Co-authored-by: Sheetal Nandi <shkamat@microsoft.com>

types/es6template/es6template-tests.ts

@@ -0,0 +1,14 @@
+import es6template = require('es6template');
+
+// This rule is disabled because the library uses ES6-looking template strings, but with normal strings.
+/* tslint:disable:no-invalid-template-strings */
+
+const test1 = es6template('foo ${bar} baz ${quux}', {bar: 'BAR', quux: 'QUUX'});
+const test2 = es6template.render('Hello ${place} and ${user.name}!', {
+    place: 'world',
+    user: {
+        name: 'Charlike'
+    }
+});
+const fn = es6template.compile('Hello ${place} and ${user.name}!');
+const test3 = fn({place: 'world', user: {name: 'Charlike'}});

types/es6template/index.d.ts

@@ -0,0 +1,16 @@
+// Type definitions for es6template 1.0
+// Project: https://github.com/zalmoxisus/es6-template
+// Definitions by: Nathan Bierema <https://github.com/Methuselah96>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+interface Default {
+    render: (str: string, locals: Record<string, unknown>) => string;
+
+    // This rule is disabled because the caller of `compile()` knows what the type of the `locals` parameter should be when
+    // calling the `compile` function.
+    // tslint:disable-next-line:no-unnecessary-generics
+    compile: <Locals>(str: string) => ((locals: Locals) => string);
+    (str: string, locals: Record<string, unknown>): string;
+}
+declare const _default: Default;
+export = _default;

types/es6template/tsconfig.json

@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "es6template-tests.ts"
+    ]
+}

types/es6template/tslint.json

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