-
Notifications
You must be signed in to change notification settings - Fork 2
Expand file tree
/
Copy pathjs-tooling.html
More file actions
660 lines (577 loc) · 29.5 KB
/
js-tooling.html
File metadata and controls
660 lines (577 loc) · 29.5 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>JS/TS Tooling & Bundlers - Better Dev</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<header class="topbar">
<button class="sidebar-toggle" aria-label="Open navigation" aria-expanded="false">
<span class="hamburger-icon"></span>
</button>
<a href="index.html" class="logo">Better Dev</a>
</header>
<div class="sidebar-backdrop" aria-hidden="true"></div>
<aside class="sidebar" aria-label="Site navigation">
<div class="sidebar-header">
<span class="sidebar-title">Navigation</span>
<button class="sidebar-close" aria-label="Close navigation">×</button>
</div>
<div class="sidebar-search">
<input type="text" class="sidebar-search-input" placeholder="Search topics..." aria-label="Search topics">
<div class="sidebar-search-results"></div>
</div>
<nav class="sidebar-nav">
<div class="sidebar-group">
<a href="index.html">Home</a>
</div>
<div class="sidebar-group">
<div class="sidebar-group-label">Mathematics</div>
<a href="pre-algebra.html">Pre-Algebra</a>
<a href="algebra.html">Algebra</a>
<a href="sequences-series.html">Sequences & Series</a>
<a href="geometry.html">Geometry</a>
<a href="calculus.html">Calculus</a>
<a href="discrete-math.html">Discrete Math</a>
<a href="linear-algebra.html">Linear Algebra</a>
<a href="probability.html">Probability & Statistics</a>
<a href="binary-systems.html">Binary & Number Systems</a>
<a href="number-theory.html">Number Theory for CP</a>
<a href="computational-geometry.html">Computational Geometry</a>
<a href="game-theory.html">Game Theory</a>
</div>
<div class="sidebar-group">
<div class="sidebar-group-label">Data Structures & Algorithms</div>
<a href="dsa-foundations.html">DSA Foundations</a>
<a href="arrays.html">Arrays & Strings</a>
<a href="stacks-queues.html">Stacks & Queues</a>
<a href="hashmaps.html">Hash Maps & Sets</a>
<a href="linked-lists.html">Linked Lists</a>
<a href="trees.html">Trees & BST</a>
<a href="graphs.html">Graphs</a>
<a href="sorting.html">Sorting & Searching</a>
<a href="patterns.html">LeetCode Patterns</a>
<a href="dp.html">Dynamic Programming</a>
<a href="advanced.html">Advanced Topics</a>
<a href="string-algorithms.html">String Algorithms</a>
<a href="advanced-graphs.html">Advanced Graphs</a>
<a href="advanced-dp.html">Advanced DP</a>
<a href="advanced-ds.html">Advanced Data Structures</a>
<a href="leetcode-650.html">The 650 Problems</a>
<a href="competitive-programming.html">CP Roadmap</a>
</div>
<div class="sidebar-group">
<div class="sidebar-group-label">Languages & Systems</div>
<a href="cpp.html">C++</a>
<a href="golang.html">Go</a>
<a href="javascript.html">JavaScript Deep Dive</a>
<a href="typescript.html">TypeScript</a>
<a href="nodejs.html">Node.js Internals</a>
<a href="os.html">Operating Systems</a>
<a href="linux.html">Linux</a>
<a href="git.html">Git</a>
<a href="backend.html">Backend</a>
<a href="system-design.html">System Design</a>
<a href="networking.html">Networking</a>
<a href="cloud.html">Cloud & Infrastructure</a>
<a href="docker.html">Docker & Compose</a>
<a href="kubernetes.html">Kubernetes</a>
<a href="message-queues.html">Queues & Pub/Sub</a>
<a href="selfhosting.html">VPS & Self-Hosting</a>
<a href="databases.html">PostgreSQL & MySQL</a>
<a href="stripe.html">Stripe & Payments</a>
<a href="distributed-systems.html">Distributed Systems</a>
<a href="backend-engineering.html">Backend Engineering</a>
</div>
<div class="sidebar-group">
<div class="sidebar-group-label">JS/TS Ecosystem</div>
<a href="js-tooling.html">Tooling & Bundlers</a>
<a href="js-testing.html">Testing</a>
<a href="ts-projects.html">Building with TS</a>
</div>
<div class="sidebar-group">
<div class="sidebar-group-label">More</div>
<a href="seans-brain.html">Sean's Brain</a>
</div>
</nav>
</aside>
<div class="container">
<div class="page-header">
<div class="breadcrumb"><a href="index.html">Home</a> / Tooling & Bundlers</div>
<h1>JS/TS Tooling & Bundlers</h1>
<p>The JavaScript ecosystem has a lot of tooling. This page cuts through the noise: package managers, bundlers, transpilers, linters, and module resolution -- what each does, when to use it, and how they fit together.</p>
</div>
<div class="toc">
<h4>Table of Contents</h4>
<a href="#package-managers">1. Package Managers (npm, yarn, pnpm)</a>
<a href="#package-json">2. package.json Deep Dive</a>
<a href="#module-resolution">3. Module Resolution</a>
<a href="#bundlers">4. Bundlers: Webpack, Vite, esbuild</a>
<a href="#transpilers">5. Transpilers: Babel, SWC, tsc</a>
<a href="#linting-formatting">6. Linting & Formatting</a>
<a href="#npm-audit">7. npm audit & Security</a>
<a href="#monorepos">8. Monorepos & Workspaces</a>
<a href="#task-runners">9. Task Runners & Scripts</a>
<a href="#putting-together">10. Putting It All Together</a>
</div>
<!-- ───────────── SECTION 1 ───────────── -->
<section id="package-managers">
<h2>1. Package Managers (npm, yarn, pnpm)</h2>
<pre><code><span class="lang-label">Text</span>
Tool Lock File node_modules Speed
──────────────────────────────────────────────────────────
npm package-lock.json Flat (hoisted) Baseline
yarn yarn.lock Flat (hoisted) Faster (cache)
pnpm pnpm-lock.yaml Symlinked (strict) Fastest (content-addressable)
</code></pre>
<h3>Key Commands</h3>
<pre><code><span class="lang-label">Bash</span>
<span class="comment"># Install all dependencies</span>
npm install <span class="comment"># or: yarn, pnpm install</span>
<span class="comment"># Add a dependency</span>
npm install express <span class="comment"># or: yarn add express, pnpm add express</span>
<span class="comment"># Add a dev dependency</span>
npm install -D vitest <span class="comment"># or: yarn add -D, pnpm add -D</span>
<span class="comment"># Remove a dependency</span>
npm uninstall express
<span class="comment"># Run a script from package.json</span>
npm run build <span class="comment"># or: yarn build, pnpm build</span>
<span class="comment"># Run a binary from node_modules/.bin</span>
npx vitest <span class="comment"># or: yarn dlx, pnpm dlx</span>
<span class="comment"># Clean install (CI, reproducible)</span>
npm ci <span class="comment"># deletes node_modules, installs from lock file exactly</span>
</code></pre>
<h3>Why pnpm?</h3>
<div class="tip-box">
<strong>pnpm</strong> stores packages in a global content-addressable store and symlinks them into your project. This means:
<ul>
<li>Packages are never duplicated on disk (saves GBs across projects)</li>
<li>Installs are faster because packages are hard-linked</li>
<li>Strict node_modules prevents "phantom dependencies" (using packages you didn't declare)</li>
</ul>
</div>
</section>
<!-- ───────────── SECTION 2 ───────────── -->
<section id="package-json">
<h2>2. package.json Deep Dive</h2>
<pre><code><span class="lang-label">JSON</span>
{
<span class="string">"name"</span>: <span class="string">"my-project"</span>,
<span class="string">"version"</span>: <span class="string">"1.0.0"</span>,
<span class="string">"type"</span>: <span class="string">"module"</span>, <span class="comment">// ← ESM by default (.js files use import/export)</span>
<span class="string">"main"</span>: <span class="string">"./dist/index.cjs"</span>, <span class="comment">// ← CJS entry point</span>
<span class="string">"module"</span>: <span class="string">"./dist/index.js"</span>, <span class="comment">// ← ESM entry point (bundlers)</span>
<span class="comment">// Modern exports field (replaces main/module)</span>
<span class="string">"exports"</span>: {
<span class="string">"."</span>: {
<span class="string">"import"</span>: <span class="string">"./dist/index.js"</span>,
<span class="string">"require"</span>: <span class="string">"./dist/index.cjs"</span>,
<span class="string">"types"</span>: <span class="string">"./dist/index.d.ts"</span>
},
<span class="string">"./utils"</span>: <span class="string">"./dist/utils.js"</span>
},
<span class="string">"scripts"</span>: {
<span class="string">"dev"</span>: <span class="string">"vite"</span>,
<span class="string">"build"</span>: <span class="string">"tsc && vite build"</span>,
<span class="string">"test"</span>: <span class="string">"vitest"</span>,
<span class="string">"lint"</span>: <span class="string">"eslint src/"</span>,
<span class="string">"typecheck"</span>: <span class="string">"tsc --noEmit"</span>
},
<span class="string">"dependencies"</span>: {
<span class="string">"express"</span>: <span class="string">"^4.18.0"</span> <span class="comment">// ^ = compatible (4.18.x, 4.19.x, etc.)</span>
},
<span class="string">"devDependencies"</span>: {
<span class="string">"typescript"</span>: <span class="string">"~5.3.0"</span>, <span class="comment">// ~ = patch only (5.3.0, 5.3.1, etc.)</span>
<span class="string">"vitest"</span>: <span class="string">"^1.0.0"</span>
},
<span class="string">"engines"</span>: {
<span class="string">"node"</span>: <span class="string">">=20.0.0"</span> <span class="comment">// enforce minimum Node version</span>
}
}
</code></pre>
<h3>Semver Ranges</h3>
<pre><code><span class="lang-label">Text</span>
^1.2.3 → >=1.2.3 <1.0.0 (any 1.x.x, most common)
~1.2.3 → >=1.2.3 <1.3.0 (only patch updates)
1.2.3 → exactly 1.2.3 (pinned)
* → any version (dangerous)
>=2.0.0 → 2.0.0 or higher
</code></pre>
<div class="warning-box">
<strong>dependencies vs devDependencies:</strong> <code>dependencies</code> are needed at runtime (express, react). <code>devDependencies</code> are only needed during development (typescript, vitest, eslint). When someone installs your package, devDependencies are NOT installed.
</div>
</section>
<!-- ───────────── SECTION 3 ───────────── -->
<section id="module-resolution">
<h2>3. Module Resolution</h2>
<p>When you write <code>import x from "foo"</code>, the resolver figures out what file "foo" actually points to.</p>
<pre><code><span class="lang-label">Text</span>
import "./math" → Relative: looks for ./math.ts, ./math.js, ./math/index.ts
import "express" → Bare specifier: looks in node_modules
import "node:fs" → Node built-in (explicit)
import "@scope/pkg" → Scoped package in node_modules/@scope/pkg
</code></pre>
<h3>Node Module Resolution Algorithm</h3>
<pre><code><span class="lang-label">Text</span>
require("express")
1. Check node_modules/express/package.json "main" field
2. Check node_modules/express/index.js
3. If not found, go to parent directory's node_modules/
4. Repeat up to filesystem root
ESM resolution (import):
1. Check package.json "exports" field first
2. Fall back to "main" field
3. No automatic extension resolution (.js must be explicit!)
</code></pre>
<div class="warning-box">
<strong>ESM gotcha:</strong> In ESM, you must include the file extension: <code>import { add } from "./math.js"</code> (not <code>"./math"</code>). TypeScript with <code>"moduleResolution": "NodeNext"</code> enforces this. Bundlers like Vite handle it for you.
</div>
<h3>tsconfig moduleResolution Options</h3>
<pre><code><span class="lang-label">Text</span>
"node" → Legacy CJS resolution (Node 12 style)
"node16" → Respects package.json "exports", requires extensions
"nodenext" → Same as node16 (latest Node resolution)
"bundler" → For Vite/Webpack: no extensions required, supports "exports"
</code></pre>
</section>
<!-- ───────────── SECTION 4 ───────────── -->
<section id="bundlers">
<h2>4. Bundlers: Webpack, Vite, esbuild</h2>
<h3>What a Bundler Does</h3>
<pre><code><span class="lang-label">Text</span>
Many source files → Bundle → One or few output files
src/index.ts ─┐
src/utils.ts ─┤→ [Bundler] → dist/bundle.js
src/api.ts ─┘ dist/bundle.css
</code></pre>
<h3>Webpack</h3>
<p>The original. Extremely configurable, plugin-heavy, slower than modern alternatives.</p>
<pre><code><span class="lang-label">JavaScript</span>
<span class="comment">// webpack.config.js</span>
<span class="keyword">export default</span> {
entry: <span class="string">"./src/index.ts"</span>,
output: { filename: <span class="string">"bundle.js"</span>, path: <span class="string">"./dist"</span> },
module: {
rules: [
{ test: /\.tsx?$/, use: <span class="string">"ts-loader"</span> },
{ test: /\.css$/, use: [<span class="string">"style-loader"</span>, <span class="string">"css-loader"</span>] },
]
},
resolve: { extensions: [<span class="string">".ts"</span>, <span class="string">".tsx"</span>, <span class="string">".js"</span>] }
};
</code></pre>
<h3>Vite</h3>
<p>Dev server uses native ESM (no bundling during dev = instant start). Production uses Rollup.</p>
<pre><code><span class="lang-label">JavaScript</span>
<span class="comment">// vite.config.ts</span>
<span class="keyword">import</span> { defineConfig } <span class="keyword">from</span> <span class="string">"vite"</span>;
<span class="keyword">export default</span> <span class="function">defineConfig</span>({
build: { outDir: <span class="string">"dist"</span> },
server: { port: <span class="number">3000</span> }
});
</code></pre>
<h3>esbuild</h3>
<p>Written in Go. 10-100x faster than Webpack. No config file needed.</p>
<pre><code><span class="lang-label">Bash</span>
<span class="comment"># Bundle a TS file to JS</span>
esbuild src/index.ts --bundle --outfile=dist/bundle.js --platform=node
<span class="comment"># Minify for production</span>
esbuild src/index.ts --bundle --minify --outfile=dist/bundle.min.js
</code></pre>
<h3>tsup (Library Bundler)</h3>
<p>Built on esbuild. The go-to for bundling TypeScript libraries.</p>
<pre><code><span class="lang-label">Bash</span>
<span class="comment"># Outputs CJS + ESM + .d.ts files</span>
tsup src/index.ts --format cjs,esm --dts
</code></pre>
<pre><code><span class="lang-label">Text</span>
Tool Speed Config Best For
───────────────────────────────────────────────────
Webpack Slow Heavy Legacy projects, complex apps
Vite Fast Minimal Frontend apps, dev experience
esbuild Fastest Minimal Bundling, quick builds
tsup Fast Zero-config TypeScript libraries
Rollup Medium Moderate Libraries, tree-shaking
</code></pre>
</section>
<!-- ───────────── SECTION 5 ───────────── -->
<section id="transpilers">
<h2>5. Transpilers: Babel, SWC, tsc</h2>
<p>Transpilers convert modern JS/TS into older JS that more environments can run.</p>
<pre><code><span class="lang-label">Text</span>
Tool Written In Speed Does Type Checking?
──────────────────────────────────────────────────────
tsc TypeScript Slow ✅ Yes (that's the point)
Babel JavaScript Medium ❌ No (strips types only)
SWC Rust Very Fast ❌ No (strips types only)
</code></pre>
<h3>Modern Approach: Strip Types, Check Separately</h3>
<pre><code><span class="lang-label">JSON</span>
{
<span class="string">"scripts"</span>: {
<span class="string">"build"</span>: <span class="string">"tsup src/index.ts"</span>,
<span class="string">"typecheck"</span>: <span class="string">"tsc --noEmit"</span>,
<span class="string">"ci"</span>: <span class="string">"npm run typecheck && npm run build && npm run test"</span>
}
}
</code></pre>
<div class="tip-box">
<strong>Don't use tsc as your build tool.</strong> Use it only for type checking (<code>--noEmit</code>). Let esbuild/swc/tsup handle the actual compilation -- they're 10-100x faster because they skip type checking.
</div>
<h3>Babel Config (babel.config.json)</h3>
<pre><code><span class="lang-label">JSON</span>
{
<span class="string">"presets"</span>: [
[<span class="string">"@babel/preset-env"</span>, { <span class="string">"targets"</span>: <span class="string">"node 20"</span> }],
<span class="string">"@babel/preset-typescript"</span>
]
}
</code></pre>
</section>
<!-- ───────────── SECTION 6 ───────────── -->
<section id="linting-formatting">
<h2>6. Linting & Formatting</h2>
<h3>ESLint</h3>
<pre><code><span class="lang-label">Bash</span>
<span class="comment"># Setup</span>
npm init @eslint/config@latest
<span class="comment"># Run</span>
npx eslint src/
npx eslint --fix src/ <span class="comment"># auto-fix</span>
</code></pre>
<pre><code><span class="lang-label">JavaScript</span>
<span class="comment">// eslint.config.js (flat config, ESLint 9+)</span>
<span class="keyword">import</span> tseslint <span class="keyword">from</span> <span class="string">"typescript-eslint"</span>;
<span class="keyword">export default</span> tseslint.config(
tseslint.configs.recommended,
{
rules: {
<span class="string">"@typescript-eslint/no-unused-vars"</span>: <span class="string">"error"</span>,
<span class="string">"@typescript-eslint/no-explicit-any"</span>: <span class="string">"warn"</span>,
}
}
);
</code></pre>
<h3>Prettier (Formatting)</h3>
<pre><code><span class="lang-label">Bash</span>
npx prettier --write src/ <span class="comment"># format all files</span>
npx prettier --check src/ <span class="comment"># check without writing (CI)</span>
</code></pre>
<h3>Biome (ESLint + Prettier alternative)</h3>
<pre><code><span class="lang-label">Bash</span>
<span class="comment"># Single tool that replaces ESLint + Prettier</span>
npx @biomejs/biome check src/ <span class="comment"># lint + format check</span>
npx @biomejs/biome check --fix src/ <span class="comment"># auto-fix both</span>
</code></pre>
</section>
<!-- ───────────── SECTION 7 ───────────── -->
<section id="npm-audit">
<h2>7. npm audit & Security</h2>
<pre><code><span class="lang-label">Bash</span>
<span class="comment"># Check for known vulnerabilities</span>
npm audit
<span class="comment"># Auto-fix what it can (updates to patched versions)</span>
npm audit fix
<span class="comment"># Force fix (may include breaking changes)</span>
npm audit fix --force
<span class="comment"># See detailed info about a vulnerability</span>
npm audit --json
</code></pre>
<h3>What npm audit Actually Does</h3>
<pre><code><span class="lang-label">Text</span>
1. Reads your package-lock.json
2. Sends the dependency tree to the npm registry
3. Registry checks against the GitHub Advisory Database
4. Returns vulnerabilities with severity levels:
- critical, high, moderate, low, info
</code></pre>
<div class="tip-box">
<strong>Not all audit warnings matter.</strong> A "critical" vulnerability in a dev-only tool (like a test framework) that never runs in production is often low-risk. Focus on vulnerabilities in <code>dependencies</code> that run in production.
</div>
<h3>Lockfile Importance</h3>
<p>The lock file (package-lock.json / yarn.lock / pnpm-lock.yaml) pins exact versions. <strong>Always commit it.</strong> Without it, <code>npm install</code> can resolve different versions on different machines.</p>
</section>
<!-- ───────────── SECTION 8 ───────────── -->
<section id="monorepos">
<h2>8. Monorepos & Workspaces</h2>
<p>A monorepo holds multiple packages/apps in one repository. Workspaces let them share dependencies.</p>
<pre><code><span class="lang-label">Text</span>
my-monorepo/
├── package.json ← root, defines workspaces
├── packages/
│ ├── shared/ ← @myorg/shared
│ │ ├── package.json
│ │ └── src/
│ ├── api/ ← @myorg/api
│ │ ├── package.json
│ │ └── src/
│ └── web/ ← @myorg/web
│ ├── package.json
│ └── src/
</code></pre>
<pre><code><span class="lang-label">JSON</span>
<span class="comment">// root package.json</span>
{
<span class="string">"private"</span>: <span class="keyword">true</span>,
<span class="string">"workspaces"</span>: [<span class="string">"packages/*"</span>]
}
</code></pre>
<pre><code><span class="lang-label">Bash</span>
<span class="comment"># Run a script in a specific workspace</span>
npm run build --workspace=packages/api
<span class="comment"># pnpm (more ergonomic)</span>
pnpm --filter @myorg/api build
<span class="comment"># Turborepo: run across all workspaces with caching</span>
npx turbo build
</code></pre>
<h3>Turborepo</h3>
<p>The go-to task runner for monorepos. Caches results, runs tasks in parallel, respects dependency order.</p>
<pre><code><span class="lang-label">JSON</span>
<span class="comment">// turbo.json</span>
{
<span class="string">"tasks"</span>: {
<span class="string">"build"</span>: { <span class="string">"dependsOn"</span>: [<span class="string">"^build"</span>], <span class="string">"outputs"</span>: [<span class="string">"dist/**"</span>] },
<span class="string">"test"</span>: { <span class="string">"dependsOn"</span>: [<span class="string">"build"</span>] },
<span class="string">"lint"</span>: {}
}
}
</code></pre>
</section>
<!-- ───────────── SECTION 9 ───────────── -->
<section id="task-runners">
<h2>9. Task Runners & Scripts</h2>
<h3>npm Scripts</h3>
<pre><code><span class="lang-label">JSON</span>
{
<span class="string">"scripts"</span>: {
<span class="string">"dev"</span>: <span class="string">"vite"</span>,
<span class="string">"build"</span>: <span class="string">"tsc --noEmit && vite build"</span>,
<span class="string">"preview"</span>: <span class="string">"vite preview"</span>,
<span class="string">"test"</span>: <span class="string">"vitest"</span>,
<span class="string">"test:ci"</span>: <span class="string">"vitest run --coverage"</span>,
<span class="string">"lint"</span>: <span class="string">"eslint src/"</span>,
<span class="string">"format"</span>: <span class="string">"prettier --write src/"</span>,
<span class="string">"typecheck"</span>: <span class="string">"tsc --noEmit"</span>,
<span class="string">"clean"</span>: <span class="string">"rm -rf dist node_modules"</span>,
<span class="string">"preinstall"</span>: <span class="string">"npx only-allow pnpm"</span>
}
}
</code></pre>
<h3>Lifecycle Scripts</h3>
<pre><code><span class="lang-label">Text</span>
preinstall → before npm install
postinstall → after npm install
prepare → after install + before publish (great for husky)
prepublish → before npm publish
</code></pre>
<h3>npm-run-all / concurrently</h3>
<pre><code><span class="lang-label">JSON</span>
{
<span class="string">"scripts"</span>: {
<span class="string">"dev"</span>: <span class="string">"concurrently \"vite\" \"tsc --watch --noEmit\""</span>,
<span class="string">"check-all"</span>: <span class="string">"npm-run-all --parallel lint typecheck test"</span>
}
}
</code></pre>
</section>
<!-- ───────────── SECTION 10 ───────────── -->
<section id="putting-together">
<h2>10. Putting It All Together</h2>
<div class="example-box">
<strong>Recommended TS project setup (2025):</strong>
<pre><code><span class="lang-label">Text</span>
Tool Choice Why
─────────────────────────────────────────────
Package mgr pnpm Fast, strict, disk efficient
Bundler tsup/esbuild Fast, zero-config for libs
Dev server Vite Instant HMR, ESM-native
Type check tsc --noEmit Gold standard
Linter ESLint 9+ Flat config, TS support
Formatter Prettier No debates about style
Test runner Vitest Fast, Vite-compatible
Monorepo Turborepo Caching, parallel tasks
</code></pre>
</div>
<h3>Starter Commands</h3>
<pre><code><span class="lang-label">Bash</span>
<span class="comment"># New TS project from scratch</span>
mkdir my-project && cd my-project
pnpm init
pnpm add -D typescript @types/node
npx tsc --init
<span class="comment"># Or use a starter template</span>
pnpm create vite my-app --template vanilla-ts
</code></pre>
</section>
</div>
<footer class="site-footer">
<p>© 2025 Better Dev. For personal study use.</p>
<p style="margin-top: 1rem; font-size: 0.85rem;"><a href="https://github.com/pythonwithsean/BetterDev/blob/main/js-tooling.html" target="_blank" rel="noopener noreferrer" class="edit-link">Edit this page on GitHub <svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" style="vertical-align: middle; margin-left: 2px;"><path d="M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6"></path><polyline points="15 3 21 3 21 9"></polyline><line x1="10" y1="14" x2="21" y2="3"></line></svg></a></p>
</footer>
<script>
(function(){
var sidebar=document.querySelector('.sidebar');
var backdrop=document.querySelector('.sidebar-backdrop');
var toggleBtn=document.querySelector('.sidebar-toggle');
var closeBtn=document.querySelector('.sidebar-close');
var si=document.querySelector('.sidebar-search-input');
function openSidebar(){
sidebar.classList.add('open');
backdrop.classList.add('visible');
document.body.classList.add('sidebar-open');
toggleBtn.setAttribute('aria-expanded','true');
if(si)si.focus();
}
function closeSidebar(){
sidebar.classList.remove('open');
backdrop.classList.remove('visible');
document.body.classList.remove('sidebar-open');
toggleBtn.setAttribute('aria-expanded','false');
}
if(toggleBtn)toggleBtn.addEventListener('click',function(){
sidebar.classList.contains('open')?closeSidebar():openSidebar();
});
if(closeBtn)closeBtn.addEventListener('click',closeSidebar);
if(backdrop)backdrop.addEventListener('click',closeSidebar);
document.addEventListener('keydown',function(e){
if(e.key==='Escape'&&sidebar.classList.contains('open'))closeSidebar();
});
var currentPage=window.location.pathname.split('/').pop()||'index.html';
var navLinks=document.querySelectorAll('.sidebar-nav a');
for(var i=0;i<navLinks.length;i++){
if(navLinks[i].getAttribute('href')===currentPage)navLinks[i].classList.add('active');
}
var input=document.querySelector('.sidebar-search-input');
var box=document.querySelector('.sidebar-search-results');
if(!input||!box)return;
var links=[].slice.call(document.querySelectorAll('.sidebar-nav a'));
var topics=links.map(function(a){return{text:a.textContent.trim(),href:a.getAttribute('href')};});
var idx=-1;
function render(q){
if(!q){box.classList.remove('visible');box.innerHTML='';idx=-1;return;}
var lc=q.toLowerCase();
var matches=topics.filter(function(t){return t.text.toLowerCase().indexOf(lc)!==-1;});
if(matches.length===0){box.innerHTML='<div class="no-results">No topics found</div>';box.classList.add('visible');idx=-1;return;}
box.innerHTML=matches.map(function(m){return'<a href="'+m.href+'">'+m.text+'</a>';}).join('');
box.classList.add('visible');
idx=-1;
}
function highlight(items){
for(var i=0;i<items.length;i++){items[i].classList.toggle('highlighted',i===idx);}
}
input.addEventListener('input',function(){render(this.value);});
input.addEventListener('keydown',function(e){
var items=box.querySelectorAll('a');
if(!items.length)return;
if(e.key==='ArrowDown'){e.preventDefault();idx=Math.min(idx+1,items.length-1);highlight(items);items[idx].scrollIntoView({block:'nearest'});}
else if(e.key==='ArrowUp'){e.preventDefault();idx=Math.max(idx-1,0);highlight(items);items[idx].scrollIntoView({block:'nearest'});}
else if(e.key==='Enter'&&idx>=0){e.preventDefault();items[idx].click();}
});
input.addEventListener('blur',function(){setTimeout(function(){box.classList.remove('visible');idx=-1;},200);});
input.addEventListener('focus',function(){if(this.value)render(this.value);});
})();
</script>
</body>
</html>