refactor: switch to export-based evaluation pattern

- Replace console.log Results output with direct exports
- Rewrite tests to import modules directly instead of parsing stdout
- Add export instructions with 🐨 and 💰 hints in problem files
- Add helpful 🚨 error messages for common mistakes

Author: kentcdodds

exercises/01.expressions-and-output/01.problem.hello-world/package.json

@@ -2,7 +2,7 @@
   "name": "exercises_01.expressions-and-output_01.problem.hello-world",
   "type": "module",
   "scripts": {
-    "start": "node index.ts",
+    "start": "npx @kentcdodds/log-module@latest ./index.ts",
     "test": "node --test index.test.ts"
   }
 }

exercises/01.expressions-and-output/01.solution.hello-world/package.json

@@ -2,7 +2,7 @@
   "name": "exercises_01.expressions-and-output_01.solution.hello-world",
   "type": "module",
   "scripts": {
-    "start": "node index.ts",
+    "start": "npx @kentcdodds/log-module@latest ./index.ts",
     "test": "node --test index.test.ts"
   }
 }

exercises/01.expressions-and-output/02.problem.escaping-strings/index.ts

@@ -13,11 +13,5 @@
 // 🐨 Log tab-separated data: Name: [tab] Age: [tab] City: (like column headers)
 // 💰 Use \t to create tabs between words
 
-// 🐨 When you're done, uncomment this and update the values:
-// const results = {
-// 	apostrophe: "It's working!",
-// 	quotes: 'She said "Hi"',
-// 	newlines: 'Hello\nWorld',
-// 	tabs: 'Name:\tAge:\tCity:',
-// }
-// console.log('Results:', JSON.stringify(results))
+// 🐨 Export your variables so we can verify your work
+// 💰 export { apostrophe, quotes, newlines, tabs }

exercises/01.expressions-and-output/02.problem.escaping-strings/package.json

@@ -2,7 +2,7 @@
   "name": "exercises_01.expressions-and-output_02.problem.escaping-strings",
   "type": "module",
   "scripts": {
-    "start": "node index.ts",
+    "start": "npx @kentcdodds/log-module ./index.ts",
     "test": "node --test index.test.ts"
   }
 }

exercises/01.expressions-and-output/02.solution.escaping-strings/index.test.ts

@@ -1,38 +1,62 @@
 import assert from 'node:assert/strict'
-import { execSync } from 'node:child_process'
 import { test } from 'node:test'
+import * as solution from './index.ts'
 
-const output = execSync('npm start --silent', { encoding: 'utf8' })
-const jsonLine = output.split('\n').find((line) => line.startsWith('Results:'))
-assert.ok(jsonLine, '🚨 Missing "Results:" output line')
-const { apostrophe, quotes, newlines, tabs } = JSON.parse(
-	jsonLine.replace('Results:', '').trim(),
-)
+await test('apostrophe is exported', () => {
+	assert.ok(
+		'apostrophe' in solution,
+		'🚨 Make sure you export "apostrophe" - add: export { apostrophe, ... }',
+	)
+})
+
+await test('should have string with apostrophe', () => {
+	assert.strictEqual(
+		solution.apostrophe,
+		"It's working!",
+		'🚨 apostrophe should be "It\'s working!" - make sure you escaped the apostrophe with \\\'',
+	)
+})
 
-await test('should print string with apostrophe', () => {
+await test('quotes is exported', () => {
 	assert.ok(
-		apostrophe === "It's working!",
-		'🚨 Output should include "It\'s working!" - make sure you escaped the apostrophe',
+		'quotes' in solution,
+		'🚨 Make sure you export "quotes" - add: export { apostrophe, quotes, ... }',
 	)
 })
 
-await test('should print string with quotes', () => {
+await test('should have string with quotes', () => {
+	assert.strictEqual(
+		solution.quotes,
+		'She said "Hi"',
+		'🚨 quotes should be: She said "Hi" - make sure you escaped the double quotes with \\"',
+	)
+})
+
+await test('newlines is exported', () => {
 	assert.ok(
-		quotes === 'She said "Hi"',
-		'🚨 Output should include: She said "Hi" - make sure you escaped the double quotes',
+		'newlines' in solution,
+		'🚨 Make sure you export "newlines" - add: export { ..., newlines, ... }',
+	)
+})
+
+await test('should have Hello and World on separate lines', () => {
+	assert.strictEqual(
+		solution.newlines,
+		'Hello\nWorld',
+		'🚨 newlines should be "Hello\\nWorld" - use \\n in a single string',
 	)
 })
 
-await test('should print Hello and World on separate lines', () => {
+await test('tabs is exported', () => {
 	assert.ok(
-		newlines === 'Hello\nWorld',
-		'🚨 Output should include "Hello" and "World" on separate lines - use \\n in a single string',
+		'tabs' in solution,
+		'🚨 Make sure you export "tabs" - add: export { ..., tabs }',
 	)
 })
 
-await test('should print tab-separated values', () => {
+await test('should have tab-separated values', () => {
 	assert.ok(
-		tabs.includes('\t'),
-		'🚨 Output should include tab characters - make sure you used \\t for tabs',
+		solution.tabs.includes('\t'),
+		'🚨 tabs should include tab characters - make sure you used \\t for tabs',
 	)
 })

exercises/01.expressions-and-output/02.solution.escaping-strings/index.ts

@@ -17,4 +17,4 @@ console.log(newlines)
 const tabs = 'Name:\tAge:\tCity:'
 console.log(tabs)
 
-console.log('Results:', JSON.stringify({ apostrophe, quotes, newlines, tabs }))
+export { apostrophe, quotes, newlines, tabs }

exercises/01.expressions-and-output/02.solution.escaping-strings/package.json

@@ -2,7 +2,7 @@
   "name": "exercises_01.expressions-and-output_02.solution.escaping-strings",
   "type": "module",
   "scripts": {
-    "start": "node index.ts",
+    "start": "npx @kentcdodds/log-module ./index.ts",
     "test": "node --test index.test.ts"
   }
 }

exercises/01.expressions-and-output/03.problem.strings/index.ts

@@ -8,10 +8,5 @@
 // 🐨 Log a sentence by concatenating multiple strings
 // 💰 Example: "I" + " " + "am" + " " + "learning" + " " + "to" + " " + "code"
 
-// 🐨 When you're done, uncomment this and update the values:
-// const results = {
-// 	greeting: 'Hello TypeScript',
-// 	fullName: 'Your Name',
-// 	sentence: 'I am learning to code',
-// }
-// console.log('Results:', JSON.stringify(results))
+// 🐨 Export your variables so we can verify your work
+// 💰 export { greeting, fullName, sentence }

exercises/01.expressions-and-output/03.problem.strings/package.json

@@ -2,7 +2,7 @@
   "name": "exercises_01.expressions-and-output_03.problem.strings",
   "type": "module",
   "scripts": {
-    "start": "node index.ts",
+    "start": "npx @kentcdodds/log-module ./index.ts",
     "test": "node --test index.test.ts"
   }
 }

exercises/01.expressions-and-output/03.solution.strings/index.test.ts

@@ -1,25 +1,41 @@
 import assert from 'node:assert/strict'
-import { execSync } from 'node:child_process'
 import { readFileSync } from 'node:fs'
 import { test } from 'node:test'
+import * as solution from './index.ts'
 
-const output = execSync('npm start --silent', { encoding: 'utf8' })
-const jsonLine = output.split('\n').find((line) => line.startsWith('Results:'))
-assert.ok(jsonLine, '🚨 Missing "Results:" output line')
-const { greeting } = JSON.parse(jsonLine.replace('Results:', '').trim())
+await test('greeting is exported', () => {
+	assert.ok(
+		'greeting' in solution,
+		'🚨 Make sure you export "greeting" - add: export { greeting, ... }',
+	)
+})
+
+await test('should have Hello TypeScript', () => {
+	assert.strictEqual(
+		solution.greeting,
+		'Hello TypeScript',
+		'🚨 greeting should be "Hello TypeScript" - concatenate "Hello" + " " + "TypeScript"',
+	)
+})
+
+await test('fullName is exported', () => {
+	assert.ok(
+		'fullName' in solution,
+		'🚨 Make sure you export "fullName" - add: export { greeting, fullName, ... }',
+	)
+})
 
-await test('should print Hello TypeScript', () => {
+await test('fullName should have a space', () => {
 	assert.ok(
-		greeting === 'Hello TypeScript',
-		'🚨 Output should include "Hello TypeScript" - concatenate "Hello" + " " + "TypeScript"',
+		solution.fullName.includes(' '),
+		'🚨 fullName should contain a space between first and last name',
 	)
 })
 
-await test('should print at least three lines', () => {
-	const lines = output.trim().split('\n').filter(Boolean)
+await test('sentence is exported', () => {
 	assert.ok(
-		lines.length >= 3,
-		'🚨 Output should have at least 3 lines - make sure you logged all three string expressions',
+		'sentence' in solution,
+		'🚨 Make sure you export "sentence" - add: export { greeting, fullName, sentence }',
 	)
 })