feat(std/node) add CommonJS require (denoland/deno#3380)

Author: kevinkassimo

node/require.ts

@@ -0,0 +1,27 @@
+import { test } from "../testing/mod.ts";
+import { assertEquals, assert } from "../testing/asserts.ts";
+import { makeRequire } from "./require.ts";
+
+const selfPath = window.unescape(import.meta.url.substring(7));
+// TS compiler would try to resolve if function named "require"
+// Thus suffixing it with require_ to fix this...
+const require_ = makeRequire(selfPath);
+
+test(function requireSuccess() {
+  const result = require_("./node/tests/cjs/cjs_a.js");
+  assert("helloA" in result);
+  assert("helloB" in result);
+  assert("C" in result);
+  assert("leftPad" in result);
+  assertEquals(result.helloA(), "A");
+  assertEquals(result.helloB(), "B");
+  assertEquals(result.C, "C");
+  assertEquals(result.leftPad("pad", 4), " pad");
+});
+
+test(function requireCycle() {
+  const resultA = require_("./node/tests/cjs/cjs_cycle_a");
+  const resultB = require_("./node/tests/cjs/cjs_cycle_b");
+  assert(resultA);
+  assert(resultB);
+});

node/require_test.ts

@@ -0,0 +1,10 @@
+/* eslint-disable */
+const { helloB } = require("./cjs_b.js");
+const C = require("./subdir/cjs_c");
+const leftPad = require("left-pad");
+
+function helloA() {
+  return "A";
+}
+
+module.exports = { helloA, helloB, C, leftPad };

node/tests/cjs/cjs_a.js

@@ -0,0 +1,5 @@
+function helloB() {
+  return "B";
+}
+
+module.exports = { helloB };

node/tests/cjs/cjs_b.js

@@ -0,0 +1,3 @@
+module.exports = false;
+require("./cjs_cycle_a");
+module.exports = true;

node/tests/cjs/cjs_cycle_a.js

@@ -0,0 +1,3 @@
+module.exports = false;
+require("./cjs_cycle_b");
+module.exports = true;

node/tests/cjs/cjs_cycle_b.js

@@ -0,0 +1 @@
+module.exports = "C";

node/tests/cjs/subdir/cjs_c.js

@@ -0,0 +1,15 @@
+{
+  "name": "deno_std_node",
+  "version": "0.0.1",
+  "description": "",
+  "main": "index.js",
+  "dependencies": {
+    "left-pad": "^1.3.0"
+  },
+  "devDependencies": {},
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC"
+}