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Boa

Boa Logo

This is an experimental Javascript lexer, parser and interpreter written in Rust. Currently, it has support for some of the language.

Build StatuscodecovCrates.ioDocs.rsDiscord

Live Demo (WASM)

https://boajs.dev/boa/playground/

You can get more verbose errors when running from the command line.

Conformance

To know how much of the ECMAScript specification does Boa cover, you can check out results running the ECMASCript Test262 test suite here.

Contributing

Please, check the CONTRIBUTING.md file to know how to contribute in the project. You will need Rust installed and an editor. We have some configurations ready for VSCode.

Debugging

Check debugging.md for more info on debugging.

Web Assembly

This interpreter can be exposed to JavaScript! You can build the example locally with:

npm run build

In the console you can use window.evaluate to pass JavaScript in. To develop on the web assembly side you can run:

npm run serve

then go to http://localhost:8080.

Usage

  • Clone this repo.
  • Run with cargo run -- test.js in the project root directory where test.js is a path to an existing JS file with any valid JS code.
  • If any JS doesn't work then it's a bug. Please raise an issue!

Example

Example

Command-line Options

Usage: boa [OPTIONS] [FILE]...
Arguments:
[FILE]... The JavaScript file(s) to be evaluated
Options:
--strict Run in strict mode
-a, --dump-ast [<FORMAT>] Dump the AST to stdout with the given format [possible values: debug, json, json-pretty]
-t, --trace Dump the AST to stdout with the given format
--vi Use vi mode in the REPL
-O, --optimize
--optimizer-statistics
--flowgraph [<FORMAT>] Generate instruction flowgraph. Default is Graphviz [possible values: graphviz, mermaid]
--flowgraph-direction <FORMAT> Specifies the direction of the flowgraph. Default is top-top-bottom [possible values: top-to-bottom, bottom-to-top, left-to-right, right-to-left]
--debug-object Inject debugging object `$boa`
-m, --module Treats the input files as modules
-r, --root <ROOT> Root path from where the module resolver will try to load the modules [default: .]
-h, --help Print help (see more with '--help')
-V, --version Print version

Roadmap

See Milestones.

Benchmarks

See Benchmarks.

Profiling

See Profiling.

Changelog

See CHANGELOG.md.

Communication

Feel free to contact us on Discord.

License

This project is licensed under the Unlicense or MIT licenses, at your option.

About

Boa is an embeddable and experimental Javascript engine written in Rust. Currently, it has support for some of the language.

Resources

Code of conduct

Contributing

Security policy

Stars

0 stars

Watchers

0 watching

Forks

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
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Boa

Boa Logo

This is an experimental Javascript lexer, parser and interpreter written in Rust. Currently, it has support for some of the language.

Build StatuscodecovCrates.ioDocs.rsDiscord

Live Demo (WASM)

https://boajs.dev/boa/playground/

You can get more verbose errors when running from the command line.

Conformance

To know how much of the ECMAScript specification does Boa cover, you can check out results running the ECMASCript Test262 test suite here.

Contributing

Please, check the CONTRIBUTING.md file to know how to contribute in the project. You will need Rust installed and an editor. We have some configurations ready for VSCode.

Debugging

Check debugging.md for more info on debugging.

Web Assembly

This interpreter can be exposed to JavaScript! You can build the example locally with:

npm run build

In the console you can use window.evaluate to pass JavaScript in. To develop on the web assembly side you can run:

npm run serve

then go to http://localhost:8080.

Usage

  • Clone this repo.
  • Run with cargo run -- test.js in the project root directory where test.js is a path to an existing JS file with any valid JS code.
  • If any JS doesn't work then it's a bug. Please raise an issue!

Example

Example

Command-line Options

Usage: boa [OPTIONS] [FILE]...
Arguments:
[FILE]... The JavaScript file(s) to be evaluated
Options:
--strict Run in strict mode
-a, --dump-ast [<FORMAT>] Dump the AST to stdout with the given format [possible values: debug, json, json-pretty]
-t, --trace Dump the AST to stdout with the given format
--vi Use vi mode in the REPL
-O, --optimize
--optimizer-statistics
--flowgraph [<FORMAT>] Generate instruction flowgraph. Default is Graphviz [possible values: graphviz, mermaid]
--flowgraph-direction <FORMAT> Specifies the direction of the flowgraph. Default is top-top-bottom [possible values: top-to-bottom, bottom-to-top, left-to-right, right-to-left]
--debug-object Inject debugging object `$boa`
-m, --module Treats the input files as modules
-r, --root <ROOT> Root path from where the module resolver will try to load the modules [default: .]
-h, --help Print help (see more with '--help')
-V, --version Print version

Roadmap

See Milestones.

Benchmarks

See Benchmarks.

Profiling

See Profiling.

Changelog

See CHANGELOG.md.

Communication

Feel free to contact us on Discord.

License

This project is licensed under the Unlicense or MIT licenses, at your option.

About

Boa is an embeddable and experimental Javascript engine written in Rust. Currently, it has support for some of the language.

Resources

Code of conduct

Contributing

Security policy

Stars

0 stars

Watchers

0 watching

Forks

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix"); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
Skip to content

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2,550 Commits

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Boa

Boa Logo

This is an experimental Javascript lexer, parser and interpreter written in Rust. Currently, it has support for some of the language.

Build StatuscodecovCrates.ioDocs.rsDiscord

Live Demo (WASM)

https://boajs.dev/boa/playground/

You can get more verbose errors when running from the command line.

Conformance

To know how much of the ECMAScript specification does Boa cover, you can check out results running the ECMASCript Test262 test suite here.

Contributing

Please, check the CONTRIBUTING.md file to know how to contribute in the project. You will need Rust installed and an editor. We have some configurations ready for VSCode.

Debugging

Check debugging.md for more info on debugging.

Web Assembly

This interpreter can be exposed to JavaScript! You can build the example locally with:

npm run build

In the console you can use window.evaluate to pass JavaScript in. To develop on the web assembly side you can run:

npm run serve

then go to http://localhost:8080.

Usage

  • Clone this repo.
  • Run with cargo run -- test.js in the project root directory where test.js is a path to an existing JS file with any valid JS code.
  • If any JS doesn't work then it's a bug. Please raise an issue!

Example

Example

Command-line Options

Usage: boa [OPTIONS] [FILE]...
Arguments:
[FILE]... The JavaScript file(s) to be evaluated
Options:
--strict Run in strict mode
-a, --dump-ast [<FORMAT>] Dump the AST to stdout with the given format [possible values: debug, json, json-pretty]
-t, --trace Dump the AST to stdout with the given format
--vi Use vi mode in the REPL
-O, --optimize
--optimizer-statistics
--flowgraph [<FORMAT>] Generate instruction flowgraph. Default is Graphviz [possible values: graphviz, mermaid]
--flowgraph-direction <FORMAT> Specifies the direction of the flowgraph. Default is top-top-bottom [possible values: top-to-bottom, bottom-to-top, left-to-right, right-to-left]
--debug-object Inject debugging object `$boa`
-m, --module Treats the input files as modules
-r, --root <ROOT> Root path from where the module resolver will try to load the modules [default: .]
-h, --help Print help (see more with '--help')
-V, --version Print version

Roadmap

See Milestones.

Benchmarks

See Benchmarks.

Profiling

See Profiling.

Changelog

See CHANGELOG.md.

Communication

Feel free to contact us on Discord.

License

This project is licensed under the Unlicense or MIT licenses, at your option.

About

Boa is an embeddable and experimental Javascript engine written in Rust. Currently, it has support for some of the language.

Resources

Code of conduct

Contributing

Security policy

Stars

0 stars

Watchers

0 watching

Forks

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms"); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
Skip to content

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NameName
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Boa

Boa Logo

This is an experimental Javascript lexer, parser and interpreter written in Rust. Currently, it has support for some of the language.

Build StatuscodecovCrates.ioDocs.rsDiscord

Live Demo (WASM)

https://boajs.dev/boa/playground/

You can get more verbose errors when running from the command line.

Conformance

To know how much of the ECMAScript specification does Boa cover, you can check out results running the ECMASCript Test262 test suite here.

Contributing

Please, check the CONTRIBUTING.md file to know how to contribute in the project. You will need Rust installed and an editor. We have some configurations ready for VSCode.

Debugging

Check debugging.md for more info on debugging.

Web Assembly

This interpreter can be exposed to JavaScript! You can build the example locally with:

npm run build

In the console you can use window.evaluate to pass JavaScript in. To develop on the web assembly side you can run:

npm run serve

then go to http://localhost:8080.

Usage

  • Clone this repo.
  • Run with cargo run -- test.js in the project root directory where test.js is a path to an existing JS file with any valid JS code.
  • If any JS doesn't work then it's a bug. Please raise an issue!

Example

Example

Command-line Options

Usage: boa [OPTIONS] [FILE]...
Arguments:
[FILE]... The JavaScript file(s) to be evaluated
Options:
--strict Run in strict mode
-a, --dump-ast [<FORMAT>] Dump the AST to stdout with the given format [possible values: debug, json, json-pretty]
-t, --trace Dump the AST to stdout with the given format
--vi Use vi mode in the REPL
-O, --optimize
--optimizer-statistics
--flowgraph [<FORMAT>] Generate instruction flowgraph. Default is Graphviz [possible values: graphviz, mermaid]
--flowgraph-direction <FORMAT> Specifies the direction of the flowgraph. Default is top-top-bottom [possible values: top-to-bottom, bottom-to-top, left-to-right, right-to-left]
--debug-object Inject debugging object `$boa`
-m, --module Treats the input files as modules
-r, --root <ROOT> Root path from where the module resolver will try to load the modules [default: .]
-h, --help Print help (see more with '--help')
-V, --version Print version

Roadmap

See Milestones.

Benchmarks

See Benchmarks.

Profiling

See Profiling.

Changelog

See CHANGELOG.md.

Communication

Feel free to contact us on Discord.

License

This project is licensed under the Unlicense or MIT licenses, at your option.

About

Boa is an embeddable and experimental Javascript engine written in Rust. Currently, it has support for some of the language.

Resources

Code of conduct

Contributing

Security policy

Stars

0 stars

Watchers

0 watching

Forks

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links"); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + '
Skip to content

Latest commit

History

2,550 Commits

Folders and files

NameName
Last commit message
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Boa

Boa Logo

This is an experimental Javascript lexer, parser and interpreter written in Rust. Currently, it has support for some of the language.

Build StatuscodecovCrates.ioDocs.rsDiscord

Live Demo (WASM)

https://boajs.dev/boa/playground/

You can get more verbose errors when running from the command line.

Conformance

To know how much of the ECMAScript specification does Boa cover, you can check out results running the ECMASCript Test262 test suite here.

Contributing

Please, check the CONTRIBUTING.md file to know how to contribute in the project. You will need Rust installed and an editor. We have some configurations ready for VSCode.

Debugging

Check debugging.md for more info on debugging.

Web Assembly

This interpreter can be exposed to JavaScript! You can build the example locally with:

npm run build

In the console you can use window.evaluate to pass JavaScript in. To develop on the web assembly side you can run:

npm run serve

then go to http://localhost:8080.

Usage

  • Clone this repo.
  • Run with cargo run -- test.js in the project root directory where test.js is a path to an existing JS file with any valid JS code.
  • If any JS doesn't work then it's a bug. Please raise an issue!

Example

Example

Command-line Options

Usage: boa [OPTIONS] [FILE]...
Arguments:
[FILE]... The JavaScript file(s) to be evaluated
Options:
--strict Run in strict mode
-a, --dump-ast [<FORMAT>] Dump the AST to stdout with the given format [possible values: debug, json, json-pretty]
-t, --trace Dump the AST to stdout with the given format
--vi Use vi mode in the REPL
-O, --optimize
--optimizer-statistics
--flowgraph [<FORMAT>] Generate instruction flowgraph. Default is Graphviz [possible values: graphviz, mermaid]
--flowgraph-direction <FORMAT> Specifies the direction of the flowgraph. Default is top-top-bottom [possible values: top-to-bottom, bottom-to-top, left-to-right, right-to-left]
--debug-object Inject debugging object `$boa`
-m, --module Treats the input files as modules
-r, --root <ROOT> Root path from where the module resolver will try to load the modules [default: .]
-h, --help Print help (see more with '--help')
-V, --version Print version

Roadmap

See Milestones.

Benchmarks

See Benchmarks.

Profiling

See Profiling.

Changelog

See CHANGELOG.md.

Communication

Feel free to contact us on Discord.

License

This project is licensed under the Unlicense or MIT licenses, at your option.

About

Boa is an embeddable and experimental Javascript engine written in Rust. Currently, it has support for some of the language.

Resources

Code of conduct

Contributing

Security policy

Stars

0 stars

Watchers

0 watching

Forks

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default"); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
Skip to content

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2,550 Commits

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NameName
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Boa

Boa Logo

This is an experimental Javascript lexer, parser and interpreter written in Rust. Currently, it has support for some of the language.

Build StatuscodecovCrates.ioDocs.rsDiscord

Live Demo (WASM)

https://boajs.dev/boa/playground/

You can get more verbose errors when running from the command line.

Conformance

To know how much of the ECMAScript specification does Boa cover, you can check out results running the ECMASCript Test262 test suite here.

Contributing

Please, check the CONTRIBUTING.md file to know how to contribute in the project. You will need Rust installed and an editor. We have some configurations ready for VSCode.

Debugging

Check debugging.md for more info on debugging.

Web Assembly

This interpreter can be exposed to JavaScript! You can build the example locally with:

npm run build

In the console you can use window.evaluate to pass JavaScript in. To develop on the web assembly side you can run:

npm run serve

then go to http://localhost:8080.

Usage

  • Clone this repo.
  • Run with cargo run -- test.js in the project root directory where test.js is a path to an existing JS file with any valid JS code.
  • If any JS doesn't work then it's a bug. Please raise an issue!

Example

Example

Command-line Options

Usage: boa [OPTIONS] [FILE]...
Arguments:
[FILE]... The JavaScript file(s) to be evaluated
Options:
--strict Run in strict mode
-a, --dump-ast [<FORMAT>] Dump the AST to stdout with the given format [possible values: debug, json, json-pretty]
-t, --trace Dump the AST to stdout with the given format
--vi Use vi mode in the REPL
-O, --optimize
--optimizer-statistics
--flowgraph [<FORMAT>] Generate instruction flowgraph. Default is Graphviz [possible values: graphviz, mermaid]
--flowgraph-direction <FORMAT> Specifies the direction of the flowgraph. Default is top-top-bottom [possible values: top-to-bottom, bottom-to-top, left-to-right, right-to-left]
--debug-object Inject debugging object `$boa`
-m, --module Treats the input files as modules
-r, --root <ROOT> Root path from where the module resolver will try to load the modules [default: .]
-h, --help Print help (see more with '--help')
-V, --version Print version

Roadmap

See Milestones.

Benchmarks

See Benchmarks.

Profiling

See Profiling.

Changelog

See CHANGELOG.md.

Communication

Feel free to contact us on Discord.

License

This project is licensed under the Unlicense or MIT licenses, at your option.

About

Boa is an embeddable and experimental Javascript engine written in Rust. Currently, it has support for some of the language.

Resources

Code of conduct

Contributing

Security policy

Stars

0 stars

Watchers

0 watching

Forks

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers"); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
Skip to content

Latest commit

History

2,550 Commits

Folders and files

NameName
Last commit message
Last commit date

Repository files navigation

Boa

Boa Logo

This is an experimental Javascript lexer, parser and interpreter written in Rust. Currently, it has support for some of the language.

Build StatuscodecovCrates.ioDocs.rsDiscord

Live Demo (WASM)

https://boajs.dev/boa/playground/

You can get more verbose errors when running from the command line.

Conformance

To know how much of the ECMAScript specification does Boa cover, you can check out results running the ECMASCript Test262 test suite here.

Contributing

Please, check the CONTRIBUTING.md file to know how to contribute in the project. You will need Rust installed and an editor. We have some configurations ready for VSCode.

Debugging

Check debugging.md for more info on debugging.

Web Assembly

This interpreter can be exposed to JavaScript! You can build the example locally with:

npm run build

In the console you can use window.evaluate to pass JavaScript in. To develop on the web assembly side you can run:

npm run serve

then go to http://localhost:8080.

Usage

  • Clone this repo.
  • Run with cargo run -- test.js in the project root directory where test.js is a path to an existing JS file with any valid JS code.
  • If any JS doesn't work then it's a bug. Please raise an issue!

Example

Example

Command-line Options

Usage: boa [OPTIONS] [FILE]...
Arguments:
[FILE]... The JavaScript file(s) to be evaluated
Options:
--strict Run in strict mode
-a, --dump-ast [<FORMAT>] Dump the AST to stdout with the given format [possible values: debug, json, json-pretty]
-t, --trace Dump the AST to stdout with the given format
--vi Use vi mode in the REPL
-O, --optimize
--optimizer-statistics
--flowgraph [<FORMAT>] Generate instruction flowgraph. Default is Graphviz [possible values: graphviz, mermaid]
--flowgraph-direction <FORMAT> Specifies the direction of the flowgraph. Default is top-top-bottom [possible values: top-to-bottom, bottom-to-top, left-to-right, right-to-left]
--debug-object Inject debugging object `$boa`
-m, --module Treats the input files as modules
-r, --root <ROOT> Root path from where the module resolver will try to load the modules [default: .]
-h, --help Print help (see more with '--help')
-V, --version Print version

Roadmap

See Milestones.

Benchmarks

See Benchmarks.

Profiling

See Profiling.

Changelog

See CHANGELOG.md.

Communication

Feel free to contact us on Discord.

License

This project is licensed under the Unlicense or MIT licenses, at your option.

About

Boa is an embeddable and experimental Javascript engine written in Rust. Currently, it has support for some of the language.

Resources

Code of conduct

Contributing

Security policy

Stars

0 stars

Watchers

0 watching

Forks

Releases

Packages

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Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode"); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })();
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Boa

Boa Logo

This is an experimental Javascript lexer, parser and interpreter written in Rust. Currently, it has support for some of the language.

Build StatuscodecovCrates.ioDocs.rsDiscord

Live Demo (WASM)

https://boajs.dev/boa/playground/

You can get more verbose errors when running from the command line.

Conformance

To know how much of the ECMAScript specification does Boa cover, you can check out results running the ECMASCript Test262 test suite here.

Contributing

Please, check the CONTRIBUTING.md file to know how to contribute in the project. You will need Rust installed and an editor. We have some configurations ready for VSCode.

Debugging

Check debugging.md for more info on debugging.

Web Assembly

This interpreter can be exposed to JavaScript! You can build the example locally with:

npm run build

In the console you can use window.evaluate to pass JavaScript in. To develop on the web assembly side you can run:

npm run serve

then go to http://localhost:8080.

Usage

  • Clone this repo.
  • Run with cargo run -- test.js in the project root directory where test.js is a path to an existing JS file with any valid JS code.
  • If any JS doesn't work then it's a bug. Please raise an issue!

Example

Example

Command-line Options

Usage: boa [OPTIONS] [FILE]...
Arguments:
[FILE]... The JavaScript file(s) to be evaluated
Options:
--strict Run in strict mode
-a, --dump-ast [<FORMAT>] Dump the AST to stdout with the given format [possible values: debug, json, json-pretty]
-t, --trace Dump the AST to stdout with the given format
--vi Use vi mode in the REPL
-O, --optimize
--optimizer-statistics
--flowgraph [<FORMAT>] Generate instruction flowgraph. Default is Graphviz [possible values: graphviz, mermaid]
--flowgraph-direction <FORMAT> Specifies the direction of the flowgraph. Default is top-top-bottom [possible values: top-to-bottom, bottom-to-top, left-to-right, right-to-left]
--debug-object Inject debugging object `$boa`
-m, --module Treats the input files as modules
-r, --root <ROOT> Root path from where the module resolver will try to load the modules [default: .]
-h, --help Print help (see more with '--help')
-V, --version Print version

Roadmap

See Milestones.

Benchmarks

See Benchmarks.

Profiling

See Profiling.

Changelog

See CHANGELOG.md.

Communication

Feel free to contact us on Discord.

License

This project is licensed under the Unlicense or MIT licenses, at your option.

About

Boa is an embeddable and experimental Javascript engine written in Rust. Currently, it has support for some of the language.

Resources

Code of conduct

Contributing

Security policy

Stars

0 stars

Watchers

0 watching

Forks

Releases

Packages

Contributors

Languages