-
-
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-
-
- ![[Example of the Macrotask queue.]](images/macrotasks.svg)
-
- ©2023 Ilya Kantor
-
-
-
-
-
-
-
- ![[Stack, Heap, and Queue.]](images/js-stack-heap-queue.svg)
-
- ©2023 MDN
-
-
-
-
-
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- ![[Example of the Macrotask and Microtask queues.]](images/microtasks.svg)
-
- ©2023 Ilya Kantor
-
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-
Web Fundamentals
@@ -2728,7 +2597,6 @@
Interactivity with JavaScript
diff --git a/scripting/highlight-javascript.min.js b/scripting/highlight-javascript.min.js
new file mode 100644
index 0000000..3fa1193
--- /dev/null
+++ b/scripting/highlight-javascript.min.js
@@ -0,0 +1,80 @@
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\ No newline at end of file
diff --git a/scripting/highlight.min.css b/scripting/highlight.min.css
new file mode 100644
index 0000000..a75ea91
--- /dev/null
+++ b/scripting/highlight.min.css
@@ -0,0 +1,9 @@
+/*!
+ Theme: Default
+ Description: Original highlight.js style
+ Author: (c) Ivan Sagalaev
+ Maintainer: @highlightjs/core-team
+ Website: https://highlightjs.org/
+ License: see project LICENSE
+ Touched: 2021
+*/pre code.hljs{display:block;overflow-x:auto;padding:1em}code.hljs{padding:3px 5px}.hljs{background:#f3f3f3;color:#444}.hljs-comment{color:#697070}.hljs-punctuation,.hljs-tag{color:#444a}.hljs-tag .hljs-attr,.hljs-tag .hljs-name{color:#444}.hljs-attribute,.hljs-doctag,.hljs-keyword,.hljs-meta .hljs-keyword,.hljs-name,.hljs-selector-tag{font-weight:700}.hljs-deletion,.hljs-number,.hljs-quote,.hljs-selector-class,.hljs-selector-id,.hljs-string,.hljs-template-tag,.hljs-type{color:#800}.hljs-section,.hljs-title{color:#800;font-weight:700}.hljs-link,.hljs-operator,.hljs-regexp,.hljs-selector-attr,.hljs-selector-pseudo,.hljs-symbol,.hljs-template-variable,.hljs-variable{color:#ab5656}.hljs-literal{color:#695}.hljs-addition,.hljs-built_in,.hljs-bullet,.hljs-code{color:#397300}.hljs-meta{color:#1f7199}.hljs-meta .hljs-string{color:#38a}.hljs-emphasis{font-style:italic}.hljs-strong{font-weight:700}
\ No newline at end of file
diff --git a/scripting/highlight.min.js b/scripting/highlight.min.js
new file mode 100644
index 0000000..5d699ae
--- /dev/null
+++ b/scripting/highlight.min.js
@@ -0,0 +1,1213 @@
+/*!
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+},grmr_yaml:e=>{
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+relevance:10},{className:"string",
+begin:"[\\|>]([1-9]?[+-])?[ ]*\\n( +)[^ ][^\\n]*\\n(\\2[^\\n]+\\n?)*"},{
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+},{className:"meta",begin:"&"+e.UNDERSCORE_IDENT_RE+"$"},{className:"meta",
+begin:"\\*"+e.UNDERSCORE_IDENT_RE+"$"},{className:"bullet",begin:"-(?=[ ]|$)",
+relevance:0},e.HASH_COMMENT_MODE,{beginKeywords:n,keywords:{literal:n}},{
+className:"number",
+begin:"\\b[0-9]{4}(-[0-9][0-9]){0,2}([Tt \\t][0-9][0-9]?(:[0-9][0-9]){2})?(\\.[0-9]*)?([ \\t])*(Z|[-+][0-9][0-9]?(:[0-9][0-9])?)?\\b"
+},{className:"number",begin:e.C_NUMBER_RE+"\\b",relevance:0},s,o,a],c=[...l]
+;return c.pop(),c.push(i),r.contains=c,{name:"YAML",case_insensitive:!0,
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+const n=e.replace("grmr_","").replace("_","-");He.registerLanguage(n,Ke[e])}
+return He}()
+;"object"==typeof exports&&"undefined"!=typeof module&&(module.exports=hljs);
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diff --git a/scripting/images/babel-logo.svg b/scripting/images/babel-logo.svg
new file mode 100644
index 0000000..5cad6cc
--- /dev/null
+++ b/scripting/images/babel-logo.svg
@@ -0,0 +1 @@
+
diff --git a/scripting/images/bun-logo.svg b/scripting/images/bun-logo.svg
new file mode 100644
index 0000000..7ef1500
--- /dev/null
+++ b/scripting/images/bun-logo.svg
@@ -0,0 +1 @@
+
\ No newline at end of file
diff --git a/scripting/images/coverage-report.png b/scripting/images/coverage-report.png
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index 0000000..53b7332
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diff --git a/scripting/images/deno-logo.svg b/scripting/images/deno-logo.svg
new file mode 100644
index 0000000..f87ef30
--- /dev/null
+++ b/scripting/images/deno-logo.svg
@@ -0,0 +1 @@
+
\ No newline at end of file
diff --git a/scripting/images/eslint-logo.svg b/scripting/images/eslint-logo.svg
new file mode 100644
index 0000000..5a8dbfc
--- /dev/null
+++ b/scripting/images/eslint-logo.svg
@@ -0,0 +1 @@
+
\ No newline at end of file
diff --git a/scripting/images/eventemitter.webp b/scripting/images/eventemitter.webp
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index 0000000..44b3d8a
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diff --git a/scripting/images/jest-logo.svg b/scripting/images/jest-logo.svg
new file mode 100644
index 0000000..532845b
--- /dev/null
+++ b/scripting/images/jest-logo.svg
@@ -0,0 +1,53 @@
+
+
+
diff --git a/scripting/images/js-logo.png b/scripting/images/js-logo.png
new file mode 100644
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diff --git a/browsers/images/js-stack-heap-queue.svg b/scripting/images/js-stack-heap-queue.svg
similarity index 100%
rename from browsers/images/js-stack-heap-queue.svg
rename to scripting/images/js-stack-heap-queue.svg
diff --git a/scripting/images/linter-output.png b/scripting/images/linter-output.png
new file mode 100644
index 0000000..93e4a67
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diff --git a/browsers/images/macrotasks.svg b/scripting/images/macrotasks.svg
similarity index 100%
rename from browsers/images/macrotasks.svg
rename to scripting/images/macrotasks.svg
diff --git a/browsers/images/microtasks.svg b/scripting/images/microtasks.svg
similarity index 100%
rename from browsers/images/microtasks.svg
rename to scripting/images/microtasks.svg
diff --git a/scripting/images/minify.png b/scripting/images/minify.png
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diff --git a/scripting/images/nodejs-logo.svg b/scripting/images/nodejs-logo.svg
new file mode 100644
index 0000000..b4e4010
--- /dev/null
+++ b/scripting/images/nodejs-logo.svg
@@ -0,0 +1,8 @@
+
+
\ No newline at end of file
diff --git a/scripting/images/npm-esm-cjs.svg b/scripting/images/npm-esm-cjs.svg
new file mode 100644
index 0000000..7f4ef30
--- /dev/null
+++ b/scripting/images/npm-esm-cjs.svg
@@ -0,0 +1,149 @@
+
diff --git a/scripting/images/npm-logo.svg b/scripting/images/npm-logo.svg
new file mode 100644
index 0000000..13c7900
--- /dev/null
+++ b/scripting/images/npm-logo.svg
@@ -0,0 +1,8 @@
+
+
+
diff --git a/scripting/images/ouroboros.png b/scripting/images/ouroboros.png
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new file mode 100644
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--- /dev/null
+++ b/scripting/images/pnpm-logo.svg
@@ -0,0 +1 @@
+
diff --git a/scripting/images/prototype-chain.jpeg b/scripting/images/prototype-chain.jpeg
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new file mode 100644
index 0000000..a46d53d
--- /dev/null
+++ b/scripting/images/typescript-logo.svg
@@ -0,0 +1 @@
+
\ No newline at end of file
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new file mode 100644
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--- /dev/null
+++ b/scripting/images/yarn-logo.svg
@@ -0,0 +1,7 @@
+
+
diff --git a/scripting/index.html b/scripting/index.html
new file mode 100644
index 0000000..4a2a7a0
--- /dev/null
+++ b/scripting/index.html
@@ -0,0 +1,2961 @@
+
+
+
+ Web Scripting
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ Web Fundamentals
+ Web Scripting
+
+
+ Ruben Taelman,
+ Ghent University – imec
+
+
+ - Videos: YouTube or raw files
+ - Previous topic: A Bird’s-Eye View of the Web
+ - Next topic: Web APIs
+
+
+
+
+
+ Web Fundamentals
+ Web Scripting
+
+
+
+ 
+ 
+ 
+
+
+ 
+ Except where otherwise noted, the content of these slides is licensed under a Creative Commons Attribution 4.0 International License.
+
+
+
+
+
+ JavaScript, the programming language
+
+ ![[Logo of JavaScript.]](images/js-logo.png)
+
+
+ -
+ Created for making Web pages dynamic
+
+ - By Netscape in 1995
+
+
+ -
+ Popular first-class programming language
+
+ - Full Stack JavaScript: use JavaScript everywhere
+
+
+ -
+ Quick to develop in
+
+ - Dynamically typed
+ - Just in Time compiled
+ - Object-Oriented and Functional
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ![[Property access propagates through property chain.]](images/prototype-chain.jpeg)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ![[Non-strict equality operator is not transitive.]](images/wtfjs.webp)
+
+ ©2022 https://github.com/denysdovhan/wtfjs
+
+
+
+
+
+
+
+ ![[Plus operator also experiences strange behaviour.]](images/javascriptweird.jpg)
+
+ ©2019 Mainasara Al-amin Tsowa
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ©2023 Ilya Kantor
+
+
+
+
+
+
+
+
+
+ ©2023 MDN
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ©2023 Ilya Kantor
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ Metaprogramming: writing a program that can process itself
+
+ ![[Ouroboros]](images/ouroboros.png)
+
+ -
+ Types of metaprogramming
+
+ -
+ Introspection: Read-access to program structure
+
+ - E.g.
Object.keys()
+
+
+ -
+ Self-modification: Changing the program structure
+
+ - Dynamically modifying object fields and methods
+
+
+ -
+ Intercession: Redefine semantics of language operations
+
+ - Proxies
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ![[Logo of Node.js.]](images/nodejs-logo.svg)
+
+ Run JavaScript Everywhere
+
+
+
+ -
+ 2009: Environment for event-based Web servers
+
+ - Alternative to sequential servers that do not scale well to many concurrent connections
+
+
+ -
+ Major release every six months
+
+ - Odd versions: Limited maintenance
+ - Even versions: LTS 18 months + maintenance 12 months
+ - → Target even releases during development for stability
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ![[Asynchronous I/O using the reactor pattern in Node.js.]](images/reactor-pattern.jpg)
+
+ ©2020 Node.js Design Patterns
+
+
+
+
+
+
+
+
+
+ Node.js is the most popular environment, but alternatives exist
+
+
+
+ -
+ Deno
+
![[Logo of Deno.]](images/deno-logo.svg)
+
+ - By creator of Node.js to avoid its flaws
+ - Importing modules through URLs
+ - More secure (opt-in flags)
+ - Runs TypeScript directly
+
+
+ -
+ Bun
+
![[Logo of Bun.]](images/bun-logo.svg)
+
+ - Runs on JavaScriptCore instead of V8
+ - Faster and more memory-friendly
+ - Not fully (yet) with Node.js
+ - Runs TypeScript directly
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ![[CJS is still more popular on npm, but declining.]](images/npm-esm-cjs.svg)
+
+ ©2024 https://github.com/wooorm/
+
+
+
+
+
+
+
+
+
+
+ ![[Logo of npm.]](images/npm-logo.svg)
+
+ A package manager for Node.js
+
+
+
+ -
+ npm registry
+
+ - Millions of public JavaScript packages
+ - Open: anyone can deploy and consume
+
+
+ -
+ Command-line tool to manage packages using
package.json
+
+ - Metadata: package name, author, …
+ - Dependencies on other packages
+ - Files to be shipped with the package
+
+
+
+
+
+
+
+
+
+
+ npm is the most popular package managers, but alternatives exist
+
+
+
+ -
+ Yarn
+
![[Logo of Yarn.]](images/yarn-logo.svg)
+
+ - Initiated by Meta and Google (now independent)
+ - Solves performance issues with large projects
+ - Consistency and security
+
+
+ -
+ pnpm
+
![[Logo of pnpm.]](images/pnpm-logo.svg)
+
+ - Hard-links packages to a global store
+ - Reduces disk space across installations
+
+
+ -
+ → Both use npm's
package.json
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ![[Node modules are the heaviest objects in the universe.]](images/node_modules_heavy.png)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ![[EventEmitter enables observation on multiple events.]](images/eventemitter.webp)
+
+ ©2020 Node.js Design Patterns
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ![[Logo of ESLint.]](images/eslint-logo.svg)
+
+ Examples of rules for ESLint
+
+
+ -
+ ESLint
+
+ - Popular open-source linter for JavaScript
+
+
+ -
+
no-unused-vars
+
+ - Reports variables that are defined but are not used
+
+
+ -
+
no-undefs
+
+ - Reports code that uses undeclared variables
+
+
+
+
+
+
+
+
+
+ ![[Linters report on problems per file.]](images/linter-output.png)
+
+
+
+
+
+
+
+
+
+
+
+ ![[Logo of Jest.]](images/jest-logo.svg)
+
+ Jest is a popular testing framework for JavaScript
+
+
+ -
+ Zero configuration
+
+ - Requires minimal configuration
+ - Very configurable and extensible when needed
+
+
+ -
+ Supports many different types of projects
+
+ - Node.js, TypeScript, React, …
+
+
+
+
+
+
+
+ ![[Coverage reports show details of missed lines and branches.]](images/coverage-report.png)
+
+
+
+
+
+
+
+
+
+ ![[Logo of Babel.]](images/babel-logo.svg)
+
+ Babel makes modern JavaScript backwards-compatible
+
+
+ -
+ Older browsers or runtime environments may not support all modern ECMAScript features
+
+ - Code conversion pipeline
+
+
+ -
+ Code transformation
+
+ - Modern syntax to old syntax (e.g. await → promises)
+
+
+ -
+ Polyfills
+
+ - Defines missing classes and APIs if they are missing
+
+
+
+
+
+
+ ![[Logo of TypeScript.]](images/typescript-logo.svg)
+
+ TypeScript is a superset of JavaScript with type definitions
+
+
+ -
+ JavaScript is not strictly typed
+
+ - Developers to consult documentation when using a library
+ - Can cause difficulties for larger projects
+
+
+ -
+ TypeScript adds typings syntax
+
+ - Add types for variables, class, parameters, …
+
+
+ -
+ Highly popular
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ![[Webpack is a bundler that bundles JavaScript and other assets.]](images/webpack.png)
+
+
+
+
+
+
+
+
+
+
+ ![[Minified code is difficult to read without source maps.]](images/minify.png)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
-
-
-
Web Fundamentals
@@ -2728,7 +2597,6 @@
Interactivity with JavaScript
diff --git a/scripting/highlight-javascript.min.js b/scripting/highlight-javascript.min.js
new file mode 100644
index 0000000..3fa1193
--- /dev/null
+++ b/scripting/highlight-javascript.min.js
@@ -0,0 +1,80 @@
+/*! `javascript` grammar compiled for Highlight.js 11.9.0 */
+(()=>{var e=(()=>{"use strict"
+;const e="[A-Za-z$_][0-9A-Za-z$_]*",n=["as","in","of","if","for","while","finally","var","new","function","do","return","void","else","break","catch","instanceof","with","throw","case","default","try","switch","continue","typeof","delete","let","yield","const","class","debugger","async","await","static","import","from","export","extends"],a=["true","false","null","undefined","NaN","Infinity"],t=["Object","Function","Boolean","Symbol","Math","Date","Number","BigInt","String","RegExp","Array","Float32Array","Float64Array","Int8Array","Uint8Array","Uint8ClampedArray","Int16Array","Int32Array","Uint16Array","Uint32Array","BigInt64Array","BigUint64Array","Set","Map","WeakSet","WeakMap","ArrayBuffer","SharedArrayBuffer","Atomics","DataView","JSON","Promise","Generator","GeneratorFunction","AsyncFunction","Reflect","Proxy","Intl","WebAssembly"],s=["Error","EvalError","InternalError","RangeError","ReferenceError","SyntaxError","TypeError","URIError"],r=["setInterval","setTimeout","clearInterval","clearTimeout","require","exports","eval","isFinite","isNaN","parseFloat","parseInt","decodeURI","decodeURIComponent","encodeURI","encodeURIComponent","escape","unescape"],c=["arguments","this","super","console","window","document","localStorage","sessionStorage","module","global"],i=[].concat(r,t,s)
+;return o=>{const l=o.regex,b=e,d={begin:/<[A-Za-z0-9\\._:-]+/,
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+const a=e[0].length+e.index,t=e.input[a]
+;if("<"===t||","===t)return void n.ignoreMatch();let s
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+relevance:0},{variants:[{begin:"<>",end:""},{
+match:/<[A-Za-z0-9\\._:-]+\s*\/>/},{begin:d.begin,
+"on:begin":d.isTrulyOpeningTag,end:d.end}],subLanguage:"xml",contains:[{
+begin:d.begin,end:d.end,skip:!0,contains:["self"]}]}]},I,{
+beginKeywords:"while if switch catch for"},{
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+contains:[R]},x,{relevance:0,match:/\b[A-Z][A-Z_0-9]+\b/,
+className:"variable.constant"},O,M,{match:/\$[(.]/}]}}})()
+;hljs.registerLanguage("javascript",e)})();
\ No newline at end of file
diff --git a/scripting/highlight.min.css b/scripting/highlight.min.css
new file mode 100644
index 0000000..a75ea91
--- /dev/null
+++ b/scripting/highlight.min.css
@@ -0,0 +1,9 @@
+/*!
+ Theme: Default
+ Description: Original highlight.js style
+ Author: (c) Ivan Sagalaev
+ Maintainer: @highlightjs/core-team
+ Website: https://highlightjs.org/
+ License: see project LICENSE
+ Touched: 2021
+*/pre code.hljs{display:block;overflow-x:auto;padding:1em}code.hljs{padding:3px 5px}.hljs{background:#f3f3f3;color:#444}.hljs-comment{color:#697070}.hljs-punctuation,.hljs-tag{color:#444a}.hljs-tag .hljs-attr,.hljs-tag .hljs-name{color:#444}.hljs-attribute,.hljs-doctag,.hljs-keyword,.hljs-meta .hljs-keyword,.hljs-name,.hljs-selector-tag{font-weight:700}.hljs-deletion,.hljs-number,.hljs-quote,.hljs-selector-class,.hljs-selector-id,.hljs-string,.hljs-template-tag,.hljs-type{color:#800}.hljs-section,.hljs-title{color:#800;font-weight:700}.hljs-link,.hljs-operator,.hljs-regexp,.hljs-selector-attr,.hljs-selector-pseudo,.hljs-symbol,.hljs-template-variable,.hljs-variable{color:#ab5656}.hljs-literal{color:#695}.hljs-addition,.hljs-built_in,.hljs-bullet,.hljs-code{color:#397300}.hljs-meta{color:#1f7199}.hljs-meta .hljs-string{color:#38a}.hljs-emphasis{font-style:italic}.hljs-strong{font-weight:700}
\ No newline at end of file
diff --git a/scripting/highlight.min.js b/scripting/highlight.min.js
new file mode 100644
index 0000000..5d699ae
--- /dev/null
+++ b/scripting/highlight.min.js
@@ -0,0 +1,1213 @@
+/*!
+ Highlight.js v11.9.0 (git: f47103d4f1)
+ (c) 2006-2023 undefined and other contributors
+ License: BSD-3-Clause
+ */
+var hljs=function(){"use strict";function e(n){
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+}function a(e,...n){const t=Object.create(null);for(const n in e)t[n]=e[n]
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+++ b/scripting/images/jest-logo.svg
@@ -0,0 +1,53 @@
+
+
+
diff --git a/scripting/images/js-logo.png b/scripting/images/js-logo.png
new file mode 100644
index 0000000..050ff14
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diff --git a/browsers/images/js-stack-heap-queue.svg b/scripting/images/js-stack-heap-queue.svg
similarity index 100%
rename from browsers/images/js-stack-heap-queue.svg
rename to scripting/images/js-stack-heap-queue.svg
diff --git a/scripting/images/linter-output.png b/scripting/images/linter-output.png
new file mode 100644
index 0000000..93e4a67
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diff --git a/browsers/images/macrotasks.svg b/scripting/images/macrotasks.svg
similarity index 100%
rename from browsers/images/macrotasks.svg
rename to scripting/images/macrotasks.svg
diff --git a/browsers/images/microtasks.svg b/scripting/images/microtasks.svg
similarity index 100%
rename from browsers/images/microtasks.svg
rename to scripting/images/microtasks.svg
diff --git a/scripting/images/minify.png b/scripting/images/minify.png
new file mode 100644
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index 0000000..5b77e9f
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diff --git a/scripting/images/nodejs-architecture.webp b/scripting/images/nodejs-architecture.webp
new file mode 100644
index 0000000..528d9f8
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diff --git a/scripting/images/nodejs-logo.svg b/scripting/images/nodejs-logo.svg
new file mode 100644
index 0000000..b4e4010
--- /dev/null
+++ b/scripting/images/nodejs-logo.svg
@@ -0,0 +1,8 @@
+
+
\ No newline at end of file
diff --git a/scripting/images/npm-esm-cjs.svg b/scripting/images/npm-esm-cjs.svg
new file mode 100644
index 0000000..7f4ef30
--- /dev/null
+++ b/scripting/images/npm-esm-cjs.svg
@@ -0,0 +1,149 @@
+
diff --git a/scripting/images/npm-logo.svg b/scripting/images/npm-logo.svg
new file mode 100644
index 0000000..13c7900
--- /dev/null
+++ b/scripting/images/npm-logo.svg
@@ -0,0 +1,8 @@
+
+
+
diff --git a/scripting/images/ouroboros.png b/scripting/images/ouroboros.png
new file mode 100644
index 0000000..945fee9
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diff --git a/scripting/images/pnpm-logo.svg b/scripting/images/pnpm-logo.svg
new file mode 100644
index 0000000..8dfc30b
--- /dev/null
+++ b/scripting/images/pnpm-logo.svg
@@ -0,0 +1 @@
+
diff --git a/scripting/images/prototype-chain.jpeg b/scripting/images/prototype-chain.jpeg
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diff --git a/scripting/images/typescript-logo.svg b/scripting/images/typescript-logo.svg
new file mode 100644
index 0000000..a46d53d
--- /dev/null
+++ b/scripting/images/typescript-logo.svg
@@ -0,0 +1 @@
+
\ No newline at end of file
diff --git a/scripting/images/webpack.png b/scripting/images/webpack.png
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diff --git a/scripting/images/yarn-logo.svg b/scripting/images/yarn-logo.svg
new file mode 100644
index 0000000..9a742aa
--- /dev/null
+++ b/scripting/images/yarn-logo.svg
@@ -0,0 +1,7 @@
+
+
diff --git a/scripting/index.html b/scripting/index.html
new file mode 100644
index 0000000..4a2a7a0
--- /dev/null
+++ b/scripting/index.html
@@ -0,0 +1,2961 @@
+
+
+
+ Web Scripting
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ Web Fundamentals
+ Web Scripting
+
+
+ Ruben Taelman,
+ Ghent University – imec
+
+
+ - Videos: YouTube or raw files
+ - Previous topic: A Bird’s-Eye View of the Web
+ - Next topic: Web APIs
+
+
+
+
+
+ Web Fundamentals
+ Web Scripting
+
+
+
+
+
+
+
+
+
+ Except where otherwise noted, the content of these slides is licensed under a Creative Commons Attribution 4.0 International License.
+
+
+
+
+
+ JavaScript, the programming language
+
+
+
+
+ -
+ Created for making Web pages dynamic
+
+ - By Netscape in 1995
+
+
+ -
+ Popular first-class programming language
+
+ - Full Stack JavaScript: use JavaScript everywhere
+
+
+ -
+ Quick to develop in
+
+ - Dynamically typed
+ - Just in Time compiled
+ - Object-Oriented and Functional
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ©2022 https://github.com/denysdovhan/wtfjs
+
+
+
+
+
+
+
+
+
+ ©2019 Mainasara Al-amin Tsowa
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ©2023 Ilya Kantor
+
+
+
+
+
+
+
+
+
+ ©2023 MDN
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ©2023 Ilya Kantor
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ Metaprogramming: writing a program that can process itself
+
+
+
+ -
+ Types of metaprogramming
+
+ -
+ Introspection: Read-access to program structure
+
+ - E.g.
Object.keys()
+
+
+ -
+ Self-modification: Changing the program structure
+
+ - Dynamically modifying object fields and methods
+
+
+ -
+ Intercession: Redefine semantics of language operations
+
+ - Proxies
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ Run JavaScript Everywhere
+
+
+
+ -
+ 2009: Environment for event-based Web servers
+
+ - Alternative to sequential servers that do not scale well to many concurrent connections
+
+
+ -
+ Major release every six months
+
+ - Odd versions: Limited maintenance
+ - Even versions: LTS 18 months + maintenance 12 months
+ - → Target even releases during development for stability
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ©2020 Node.js Design Patterns
+
+
+
+
+
+
+
+
+
+ Node.js is the most popular environment, but alternatives exist
+
+
+
+ -
+ Deno
+
+
+ - By creator of Node.js to avoid its flaws
+ - Importing modules through URLs
+ - More secure (opt-in flags)
+ - Runs TypeScript directly
+
+
+ -
+ Bun
+
+
+ - Runs on JavaScriptCore instead of V8
+ - Faster and more memory-friendly
+ - Not fully (yet) with Node.js
+ - Runs TypeScript directly
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ©2024 https://github.com/wooorm/
+
+
+
+
+
+
+
+
+
+
+
+
+ A package manager for Node.js
+
+
+
+ -
+ npm registry
+
+ - Millions of public JavaScript packages
+ - Open: anyone can deploy and consume
+
+
+ -
+ Command-line tool to manage packages using
package.json
+
+ - Metadata: package name, author, …
+ - Dependencies on other packages
+ - Files to be shipped with the package
+
+
+
+
+
+
+
+
+
+
+ npm is the most popular package managers, but alternatives exist
+
+
+
+ -
+ Yarn
+
+
+ - Initiated by Meta and Google (now independent)
+ - Solves performance issues with large projects
+ - Consistency and security
+
+
+ -
+ pnpm
+
+
+ - Hard-links packages to a global store
+ - Reduces disk space across installations
+
+
+ -
+ → Both use npm's
package.json
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ©2020 Node.js Design Patterns
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ Examples of rules for ESLint
+
+
+ -
+ ESLint
+
+ - Popular open-source linter for JavaScript
+
+
+ -
+
no-unused-vars
+
+ - Reports variables that are defined but are not used
+
+
+ -
+
no-undefs
+
+ - Reports code that uses undeclared variables
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ Jest is a popular testing framework for JavaScript
+
+
+ -
+ Zero configuration
+
+ - Requires minimal configuration
+ - Very configurable and extensible when needed
+
+
+ -
+ Supports many different types of projects
+
+ - Node.js, TypeScript, React, …
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ Babel makes modern JavaScript backwards-compatible
+
+
+ -
+ Older browsers or runtime environments may not support all modern ECMAScript features
+
+ - Code conversion pipeline
+
+
+ -
+ Code transformation
+
+ - Modern syntax to old syntax (e.g. await → promises)
+
+
+ -
+ Polyfills
+
+ - Defines missing classes and APIs if they are missing
+
+
+
+
+
+
+
+
+ TypeScript is a superset of JavaScript with type definitions
+
+
+ -
+ JavaScript is not strictly typed
+
+ - Developers to consult documentation when using a library
+ - Can cause difficulties for larger projects
+
+
+ -
+ TypeScript adds typings syntax
+
+ - Add types for variables, class, parameters, …
+
+
+ -
+ Highly popular
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ Web Fundamentals
+ Web Scripting
+
+ + Ruben Taelman, + Ghent University – imec +
+-
+
- Videos: YouTube or raw files +
- Previous topic: A Bird’s-Eye View of the Web +
- Next topic: Web APIs +
+
+ Web Fundamentals
+
+
+
+
+ Web Fundamentals
+ Web Scripting
+
+
+
+
+
+
+
+
+ Except where otherwise noted, the content of these slides is licensed under a Creative Commons Attribution 4.0 International License.
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ + JavaScript, the programming language +
+
+
+
+ -
+
-
+ Created for making Web pages dynamic
+
-
+
- By Netscape in 1995 +
+ -
+ Popular first-class programming language
+
-
+
- Full Stack JavaScript: use JavaScript everywhere +
+ -
+ Quick to develop in
+
-
+
- Dynamically typed +
- Just in Time compiled +
- Object-Oriented and Functional +
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ©2022 https://github.com/denysdovhan/wtfjs
+
+
+
+
+
+
+
+
+
+
+ ©2019 Mainasara Al-amin Tsowa
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ©2023 Ilya Kantor
+
+
+
+
+
+
+
+
+
+
+ ©2023 MDN
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ©2023 Ilya Kantor
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ + Metaprogramming: writing a program that can process itself +
+
+ -
+
-
+ Types of metaprogramming
+
-
+
-
+ Introspection: Read-access to program structure
+
-
+
- E.g.
Object.keys()
+
+ - E.g.
-
+ Self-modification: Changing the program structure
+
-
+
- Dynamically modifying object fields and methods +
+ -
+ Intercession: Redefine semantics of language operations
+
-
+
- Proxies +
+
-
+ Introspection: Read-access to program structure
+
+
+
+
+
+
+
+
+
+
+
+ + Run JavaScript Everywhere +
+
+
+ -
+
-
+ 2009: Environment for event-based Web servers
+
-
+
- Alternative to sequential servers that do not scale well to many concurrent connections +
+ -
+ Major release every six months
+
-
+
- Odd versions: Limited maintenance +
- Even versions: LTS 18 months + maintenance 12 months +
- → Target even releases during development for stability +
+
+
+
+
+ ©2020 Node.js Design Patterns
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ + Node.js is the most popular environment, but alternatives exist +
+
+
+ -
+
-
+ Deno
+
+
-
+
- By creator of Node.js to avoid its flaws +
- Importing modules through URLs +
- More secure (opt-in flags) +
- Runs TypeScript directly +
+ -
+ Bun
+
+
-
+
- Runs on JavaScriptCore instead of V8 +
- Faster and more memory-friendly +
- Not fully (yet) with Node.js +
- Runs TypeScript directly +
+
+
+
+
+ ©2024 https://github.com/wooorm/
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ + A package manager for Node.js +
+
+
+ -
+
-
+ npm registry
+
-
+
- Millions of public JavaScript packages +
- Open: anyone can deploy and consume +
+ -
+ Command-line tool to manage packages using
package.json+-
+
- Metadata: package name, author, … +
- Dependencies on other packages +
- Files to be shipped with the package +
+
+
+
+
+
+
+
+
+
+
+
+
+
+ + npm is the most popular package managers, but alternatives exist +
+
+
+ -
+
-
+ Yarn
+
+
-
+
- Initiated by Meta and Google (now independent) +
- Solves performance issues with large projects +
- Consistency and security +
+ -
+ pnpm
+
+
-
+
- Hard-links packages to a global store +
- Reduces disk space across installations +
+ -
+ → Both use npm's
package.json+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ ©2020 Node.js Design Patterns
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ + Examples of rules for ESLint +
+-
+
-
+ ESLint
+
-
+
- Popular open-source linter for JavaScript +
+ -
+
no-unused-vars+-
+
- Reports variables that are defined but are not used +
+ -
+
no-undefs+-
+
- Reports code that uses undeclared variables +
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ + Jest is a popular testing framework for JavaScript +
+-
+
-
+ Zero configuration
+
-
+
- Requires minimal configuration +
- Very configurable and extensible when needed +
+ -
+ Supports many different types of projects
+
-
+
- Node.js, TypeScript, React, … +
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ + Babel makes modern JavaScript backwards-compatible +
+-
+
-
+ Older browsers or runtime environments may not support all modern ECMAScript features
+
-
+
- Code conversion pipeline +
+ -
+ Code transformation
+
-
+
- Modern syntax to old syntax (e.g. await → promises) +
+ -
+ Polyfills
+
-
+
- Defines missing classes and APIs if they are missing +
+
+
+
+
+
+
+
+
+
+
+
+
+
+ + TypeScript is a superset of JavaScript with type definitions +
+-
+
-
+ JavaScript is not strictly typed
+
-
+
- Developers to consult documentation when using a library +
- Can cause difficulties for larger projects +
+ -
+ TypeScript adds typings syntax
+
-
+
- Add types for variables, class, parameters, … +
+ - + Highly popular + + +
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+