From a5c5ea9c5b416af720b9d8fa5076484413b2b3df Mon Sep 17 00:00:00 2001
From: David Worms <david@adaltas.com>
Date: Sun, 10 Jul 2022 22:31:57 +0200
Subject: [PATCH] test(csv-ts-demo-node16): demo assiated with PR #341

---
 demo/ts-module-node16/lib/stringify.ts        | 32 ++++++++++++
 demo/ts-module-node16/package.json            | 31 ++++++++++++
 demo/ts-module-node16/test/loaders/all.js     | 16 ++++++
 demo/ts-module-node16/test/loaders/coffee.js  | 20 ++++++++
 .../test/loaders/legacy/all.js                | 37 ++++++++++++++
 .../test/loaders/legacy/coffee.js             | 50 +++++++++++++++++++
 demo/ts-module-node16/test/samples.coffee     | 26 ++++++++++
 demo/ts-module-node16/tsconfig.json           |  7 +++
 8 files changed, 219 insertions(+)
 create mode 100644 demo/ts-module-node16/lib/stringify.ts
 create mode 100644 demo/ts-module-node16/package.json
 create mode 100644 demo/ts-module-node16/test/loaders/all.js
 create mode 100644 demo/ts-module-node16/test/loaders/coffee.js
 create mode 100644 demo/ts-module-node16/test/loaders/legacy/all.js
 create mode 100644 demo/ts-module-node16/test/loaders/legacy/coffee.js
 create mode 100644 demo/ts-module-node16/test/samples.coffee
 create mode 100644 demo/ts-module-node16/tsconfig.json

diff --git a/demo/ts-module-node16/lib/stringify.ts b/demo/ts-module-node16/lib/stringify.ts
new file mode 100644
index 000000000..f4cf1db94
--- /dev/null
+++ b/demo/ts-module-node16/lib/stringify.ts
@@ -0,0 +1,32 @@
+
+import assert from 'assert'
+import { stringify, Stringifier } from 'csv-stringify';
+
+let output: string = '';
+// Create the parser
+const stringifier: Stringifier = stringify({
+  delimiter: ':',
+  encoding: 'utf8'
+});
+// Use the readable stream api to consume records
+stringifier.on('readable', function(){
+  let record; while ((record = stringifier.read()) !== null) {
+    output += record
+  }
+});
+// Catch any error
+stringifier.on('error', function(err){
+  console.error(err.message)
+});
+// Test that the parsed records matched what's expected
+stringifier.on('end', function(){
+  assert.deepStrictEqual(
+    output,
+    'a:b:c\n1:2:3\n'
+  )
+});
+// Write data to the stream
+stringifier.write(["a", "b", "c"]);
+stringifier.write([1, 2, 3]);
+// Close the readable stream
+stringifier.end();
diff --git a/demo/ts-module-node16/package.json b/demo/ts-module-node16/package.json
new file mode 100644
index 000000000..96edaddca
--- /dev/null
+++ b/demo/ts-module-node16/package.json
@@ -0,0 +1,31 @@
+{
+  "name": "csv-ts-demo-node16",
+  "version": "0.0.0",
+  "main": "index.js",
+  "license": "MIT",
+  "type": "module",
+  "private": true,
+  "devDependencies": {
+    "@types/node": "^18.0.3",
+    "coffeescript": "^2.7.0",
+    "mocha": "^10.0.0",
+    "should": "^13.2.3",
+    "ts-node": "^10.8.2",
+    "typescript": "^4.7.4"
+  },
+  "mocha": {
+    "inline-diffs": true,
+    "loader": "./test/loaders/all.js",
+    "recursive": true,
+    "reporter": "spec",
+    "require": [
+      "should"
+    ],
+    "throw-deprecation": true,
+    "timeout": 40000
+  },
+  "scripts": {
+    "test": "mocha 'test/**/*.coffee'",
+    "test:legacy": "mocha --loader=./test/loaders/legacy/all.js 'test/**/*.{coffee,ts}'"
+  }
+}
diff --git a/demo/ts-module-node16/test/loaders/all.js b/demo/ts-module-node16/test/loaders/all.js
new file mode 100644
index 000000000..344154640
--- /dev/null
+++ b/demo/ts-module-node16/test/loaders/all.js
@@ -0,0 +1,16 @@
+
+import * as coffee from './coffee.js'
+import * as ts from 'ts-node/esm'
+
+const coffeeRegex = /\.coffee$|\.litcoffee$|\.coffee\.md$/;
+const tsRegex = /\.ts$/;
+
+export function load(url, context, next) {
+  if (coffeeRegex.test(url)) {
+    return coffee.load.apply(this, arguments)
+  }
+  if (tsRegex.test(url)) {
+    return ts.load.apply(this, arguments)
+  }
+  return next(url, context, next);
+}
diff --git a/demo/ts-module-node16/test/loaders/coffee.js b/demo/ts-module-node16/test/loaders/coffee.js
new file mode 100644
index 000000000..c7b277cb7
--- /dev/null
+++ b/demo/ts-module-node16/test/loaders/coffee.js
@@ -0,0 +1,20 @@
+import CoffeeScript from 'coffeescript';
+
+// See https://github.com/nodejs/node/issues/36396
+const extensionsRegex = /\.coffee$|\.litcoffee$|\.coffee\.md$/;
+
+export async function load(url, context, next) {
+  if (extensionsRegex.test(url)) {
+    const format = 'module';
+    const { source: rawSource } = await next(url, { format });
+    const source = CoffeeScript.compile(rawSource.toString(), {
+      bare: true,
+      inlineMap: true,
+      filename: url,
+      header: false,
+      sourceMap: false,
+    });
+    return {format, source};
+  }
+  return next(url, context);
+}
diff --git a/demo/ts-module-node16/test/loaders/legacy/all.js b/demo/ts-module-node16/test/loaders/legacy/all.js
new file mode 100644
index 000000000..c95db0b56
--- /dev/null
+++ b/demo/ts-module-node16/test/loaders/legacy/all.js
@@ -0,0 +1,37 @@
+
+import * as coffee from './coffee.js'
+import * as ts from 'ts-node/esm'
+
+const coffeeRegex = /\.coffee$|\.litcoffee$|\.coffee\.md$/;
+const tsRegex = /\.ts$/;
+
+export function resolve(specifier, context, defaultResolve) {
+  if (coffeeRegex.test(specifier)) {
+    return coffee.resolve.apply(this, arguments)
+  }
+  if (tsRegex.test(specifier)) {
+    return ts.resolve.apply(this, arguments)
+  }
+  return ts.resolve.apply(this, arguments);
+}
+
+export function getFormat(url, context, defaultGetFormat) {
+  if (coffeeRegex.test(url)) {
+    return coffee.getFormat.apply(this, arguments)
+  }
+  if (tsRegex.test(url)) {
+    return ts.getFormat.apply(this, arguments)
+  }
+  return ts.getFormat.apply(this, arguments);
+}
+
+export function transformSource(source, context, defaultTransformSource) {
+  const { url } = context;
+  if (coffeeRegex.test(url)) {
+    return coffee.transformSource.apply(this, arguments)
+  }
+  if (tsRegex.test(url)) {
+    return ts.transformSource.apply(this, arguments)
+  }
+  return ts.transformSource.apply(this, arguments);
+}
diff --git a/demo/ts-module-node16/test/loaders/legacy/coffee.js b/demo/ts-module-node16/test/loaders/legacy/coffee.js
new file mode 100644
index 000000000..f4945adb7
--- /dev/null
+++ b/demo/ts-module-node16/test/loaders/legacy/coffee.js
@@ -0,0 +1,50 @@
+// coffeescript-loader.mjs
+import { URL, pathToFileURL } from 'url';
+import CoffeeScript from 'coffeescript';
+import { cwd } from 'process';
+
+const baseURL = pathToFileURL(`${cwd()}/`).href;
+
+// CoffeeScript files end in .coffee, .litcoffee or .coffee.md.
+const extensionsRegex = /\.coffee$|\.litcoffee$|\.coffee\.md$/;
+
+export function resolve(specifier, context, defaultResolve) {
+  const { parentURL = baseURL } = context;
+  // Node.js normally errors on unknown file extensions, so return a URL for
+  // specifiers ending in the CoffeeScript file extensions.
+  if (extensionsRegex.test(specifier)) {
+    return {
+      url: new URL(specifier, parentURL).href,
+      stop: true
+    };
+  }
+  // Let Node.js handle all other specifiers.
+  return defaultResolve(specifier, context, defaultResolve);
+}
+
+export function getFormat(url, context, defaultGetFormat) {
+  // Now that we patched resolve to let CoffeeScript URLs through, we need to
+  // tell Node.js what format such URLs should be interpreted as. For the
+  // purposes of this loader, all CoffeeScript URLs are ES modules.
+  if (extensionsRegex.test(url)) {
+    return {
+      format: 'module',
+      stop: true
+    };
+  }
+  // Let Node.js handle all other URLs.
+  return defaultGetFormat(url, context, defaultGetFormat);
+}
+
+export function transformSource(source, context, defaultTransformSource) {
+  const { url, format } = context;
+
+  if (extensionsRegex.test(url)) {
+    return {
+      source: CoffeeScript.compile(String(source), { bare: true })
+    };
+  }
+
+  // Let Node.js handle all other sources.
+  return defaultTransformSource(source, context, defaultTransformSource);
+}
diff --git a/demo/ts-module-node16/test/samples.coffee b/demo/ts-module-node16/test/samples.coffee
new file mode 100644
index 000000000..0a2b28d54
--- /dev/null
+++ b/demo/ts-module-node16/test/samples.coffee
@@ -0,0 +1,26 @@
+
+import fs from 'fs'
+import path from 'path'
+import { exec } from 'child_process'
+
+import { fileURLToPath } from 'url'
+__dirname = path.dirname fileURLToPath import.meta.url
+dir = path.resolve __dirname, '../lib'
+samples = fs.readdirSync dir
+
+describe 'Samples', ->
+
+  samples
+  .filter (sample) ->
+    return false unless /\.(js|ts)?$/.test sample
+    true
+  .map (sample) ->
+    it "Sample #{sample}", (callback) ->
+      ext = /\.(\w+)?$/.exec(sample)[0]
+      bin = switch ext
+        when '.js'
+          'node'
+        when '.ts'
+          'node --loader ts-node/esm'
+      exec "#{bin} #{path.resolve dir, sample}", (err, stdout, stderr) ->
+        callback err
diff --git a/demo/ts-module-node16/tsconfig.json b/demo/ts-module-node16/tsconfig.json
new file mode 100644
index 000000000..b7a38adc0
--- /dev/null
+++ b/demo/ts-module-node16/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "compilerOptions": {
+    "esModuleInterop": true,
+    "module": "Node16",
+    "strict": true,
+  }
+}