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Contract by Design

Softlib

Runtime code safety and sanity checking

by Read Write Tools Sep 13, 2015
Abstract
The softlib JavaScript library has functions for type expectations, soft assertions, and logging to the terminal with stack trace.

Motivation

Before typescript came on the scene this library was a good way to reliably verify that function inputs were in their expected form. It continues to be an essential library for software written in pure ECMAScript.

Features

The expect function provides runtime type safety without the overhead of a precompiler. It provides a strong measure of safety during execution by providing an early warning system when things aren't proceeding as expected.

The aver function is a soft assertion. When conditions should be true, an aver() can alert the developer that things haven't lived up to their promise. This is done in a non-fatal way, allowing the condition to persist (even when the aver fails) letting the code deal with the condition using whatever coding paradigm is in force, such as a try/finally block or other exception/error handling techniques.

The terminal function provides context sensitive logging. When reached via a browser, output is routed to the console as a warn() or error(). When reached via a node.js process, output is routed to stdout or stderr.

The vartype function provides dynamic introspection of a variable's current type. It goes beyond ECMAScript's native typeof and instanceof keywords by inspecting the name of the variable's constructor.

The StackTrace class provides a stack trace for the other functions.

Installation

The softlib library may be installed directly from github or via NPM.

To add the library to a node.js project, use this command:

[user@host]# npm install softlib
import {expect} from 'softlib'; import {aver} from 'softlib'; import {terminal} from 'softlib'; import {vartype} from 'softlib';

To add the library to a browser project, use this command:

[user@host]# git clone https://github.com/readwritetools/softlib.git
import {expect} from '/softlib/expect.js'; import {aver} from '/softlib/aver.js'; import {terminal} from '/softlib/terminal.js'; import {vartype} from '/softlib/vartype.js';

Metadata

Module exports

ES modulestrue
Common JSfalse

Suitability

BrowserAPI
node.jsAPI

Availability

Read Write Hub logoDocumentationRead Write Hub
git logoSource codegithub
npm logoPackage installationnpm

License

The softlib library is licensed under the MIT License.

MIT License

Copyright © 2023 Read Write Tools.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

About

Dynamic code for type expectations, soft assertions, and logging to the terminal with stack trace.

Resources

Readme
MIT license
Activity
Custom properties

Stars

0 stars

Watchers

1 watching

Forks

0 forks
Report repository

Releases

Packages

Used by

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
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function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
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(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
GitHub - readwritetools/softlib: Dynamic code for type expectations, soft assertions, and logging to the terminal with stack trace. · GitHub
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Contract by Design
Softlib
Runtime code safety and sanity checking
 by Read Write Tools Sep 13, 2015

Abstract
The softlib JavaScript library has functions for type expectations, soft assertions, and logging to the terminal with stack trace.
Motivation
Before typescript came on the scene this library was a good way to reliably
verify that function inputs were in their expected form. It continues to be an
essential library for software written in pure ECMAScript.
Features
The expect function provides runtime type safety without the overhead of a
precompiler. It provides a strong measure of safety during execution by
providing an early warning system when things aren't proceeding as expected.
The aver function is a soft assertion. When conditions should be true, an aver()
can alert the developer that things haven't lived up to their promise. This is
done in a non-fatal way, allowing the condition to persist (even when the aver
fails) letting the code deal with the condition using whatever coding paradigm
is in force, such as a try/finally block or other exception/error handling
techniques.
The terminal function provides context sensitive logging. When reached via a
browser, output is routed to the console as a warn() or error(). When reached
via a node.js process, output is routed to stdout or stderr.
The vartype function provides dynamic introspection of a variable's current
type. It goes beyond ECMAScript's native typeof and instanceof keywords by
inspecting the name of the variable's constructor.
The StackTrace class provides a stack trace for the other functions.
Installation
The softlib library may be installed directly from github or via
NPM.
To add the library to a node.js project, use this command:
[user@host]# npm install softlib
import {expect} from 'softlib'; import {aver} from 'softlib'; import {terminal} from 'softlib'; import {vartype} from 'softlib';
To add the library to a browser project, use this command:
[user@host]# git clone https://github.com/readwritetools/softlib.git
import {expect} from '/softlib/expect.js'; import {aver} from '/softlib/aver.js'; import {terminal} from '/softlib/terminal.js'; import {vartype} from '/softlib/vartype.js';
Metadata
Module exports
ES modulestrue
Common JSfalse
Suitability
BrowserAPI
node.jsAPI
Availability
Read Write Hub logoDocumentationRead Write Hub
git logoSource codegithub
npm logoPackage installationnpm
License
The softlib library is licensed under the MIT License.
MIT License
Copyright © 2023 Read Write Tools.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
About
Dynamic code for type expectations, soft assertions, and logging to the terminal with stack trace.
Resources
Readme
MIT license
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
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document.head.appendChild(style);
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} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - readwritetools/softlib: Dynamic code for type expectations, soft assertions, and logging to the terminal with stack trace. · GitHub
Skip to content
BranchesTags
Repository files navigation
html
Contract by Design
Softlib
Runtime code safety and sanity checking
 by Read Write Tools Sep 13, 2015

Abstract
The softlib JavaScript library has functions for type expectations, soft assertions, and logging to the terminal with stack trace.
Motivation
Before typescript came on the scene this library was a good way to reliably
verify that function inputs were in their expected form. It continues to be an
essential library for software written in pure ECMAScript.
Features
The expect function provides runtime type safety without the overhead of a
precompiler. It provides a strong measure of safety during execution by
providing an early warning system when things aren't proceeding as expected.
The aver function is a soft assertion. When conditions should be true, an aver()
can alert the developer that things haven't lived up to their promise. This is
done in a non-fatal way, allowing the condition to persist (even when the aver
fails) letting the code deal with the condition using whatever coding paradigm
is in force, such as a try/finally block or other exception/error handling
techniques.
The terminal function provides context sensitive logging. When reached via a
browser, output is routed to the console as a warn() or error(). When reached
via a node.js process, output is routed to stdout or stderr.
The vartype function provides dynamic introspection of a variable's current
type. It goes beyond ECMAScript's native typeof and instanceof keywords by
inspecting the name of the variable's constructor.
The StackTrace class provides a stack trace for the other functions.
Installation
The softlib library may be installed directly from github or via
NPM.
To add the library to a node.js project, use this command:
[user@host]# npm install softlib
import {expect} from 'softlib'; import {aver} from 'softlib'; import {terminal} from 'softlib'; import {vartype} from 'softlib';
To add the library to a browser project, use this command:
[user@host]# git clone https://github.com/readwritetools/softlib.git
import {expect} from '/softlib/expect.js'; import {aver} from '/softlib/aver.js'; import {terminal} from '/softlib/terminal.js'; import {vartype} from '/softlib/vartype.js';
Metadata
Module exports
ES modulestrue
Common JSfalse
Suitability
BrowserAPI
node.jsAPI
Availability
Read Write Hub logoDocumentationRead Write Hub
git logoSource codegithub
npm logoPackage installationnpm
License
The softlib library is licensed under the MIT License.
MIT License
Copyright © 2023 Read Write Tools.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
About
Dynamic code for type expectations, soft assertions, and logging to the terminal with stack trace.
Resources
Readme
MIT license
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - readwritetools/softlib: Dynamic code for type expectations, soft assertions, and logging to the terminal with stack trace. · GitHub
Skip to content
BranchesTags
Repository files navigation
html
Contract by Design
Softlib
Runtime code safety and sanity checking
 by Read Write Tools Sep 13, 2015

Abstract
The softlib JavaScript library has functions for type expectations, soft assertions, and logging to the terminal with stack trace.
Motivation
Before typescript came on the scene this library was a good way to reliably
verify that function inputs were in their expected form. It continues to be an
essential library for software written in pure ECMAScript.
Features
The expect function provides runtime type safety without the overhead of a
precompiler. It provides a strong measure of safety during execution by
providing an early warning system when things aren't proceeding as expected.
The aver function is a soft assertion. When conditions should be true, an aver()
can alert the developer that things haven't lived up to their promise. This is
done in a non-fatal way, allowing the condition to persist (even when the aver
fails) letting the code deal with the condition using whatever coding paradigm
is in force, such as a try/finally block or other exception/error handling
techniques.
The terminal function provides context sensitive logging. When reached via a
browser, output is routed to the console as a warn() or error(). When reached
via a node.js process, output is routed to stdout or stderr.
The vartype function provides dynamic introspection of a variable's current
type. It goes beyond ECMAScript's native typeof and instanceof keywords by
inspecting the name of the variable's constructor.
The StackTrace class provides a stack trace for the other functions.
Installation
The softlib library may be installed directly from github or via
NPM.
To add the library to a node.js project, use this command:
[user@host]# npm install softlib
import {expect} from 'softlib'; import {aver} from 'softlib'; import {terminal} from 'softlib'; import {vartype} from 'softlib';
To add the library to a browser project, use this command:
[user@host]# git clone https://github.com/readwritetools/softlib.git
import {expect} from '/softlib/expect.js'; import {aver} from '/softlib/aver.js'; import {terminal} from '/softlib/terminal.js'; import {vartype} from '/softlib/vartype.js';
Metadata
Module exports
ES modulestrue
Common JSfalse
Suitability
BrowserAPI
node.jsAPI
Availability
Read Write Hub logoDocumentationRead Write Hub
git logoSource codegithub
npm logoPackage installationnpm
License
The softlib library is licensed under the MIT License.
MIT License
Copyright © 2023 Read Write Tools.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
About
Dynamic code for type expectations, soft assertions, and logging to the terminal with stack trace.
Resources
Readme
MIT license
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
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return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
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var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
GitHub - readwritetools/softlib: Dynamic code for type expectations, soft assertions, and logging to the terminal with stack trace. · GitHub
Skip to content
BranchesTags
Repository files navigation
html
Contract by Design
Softlib
Runtime code safety and sanity checking
 by Read Write Tools Sep 13, 2015

Abstract
The softlib JavaScript library has functions for type expectations, soft assertions, and logging to the terminal with stack trace.
Motivation
Before typescript came on the scene this library was a good way to reliably
verify that function inputs were in their expected form. It continues to be an
essential library for software written in pure ECMAScript.
Features
The expect function provides runtime type safety without the overhead of a
precompiler. It provides a strong measure of safety during execution by
providing an early warning system when things aren't proceeding as expected.
The aver function is a soft assertion. When conditions should be true, an aver()
can alert the developer that things haven't lived up to their promise. This is
done in a non-fatal way, allowing the condition to persist (even when the aver
fails) letting the code deal with the condition using whatever coding paradigm
is in force, such as a try/finally block or other exception/error handling
techniques.
The terminal function provides context sensitive logging. When reached via a
browser, output is routed to the console as a warn() or error(). When reached
via a node.js process, output is routed to stdout or stderr.
The vartype function provides dynamic introspection of a variable's current
type. It goes beyond ECMAScript's native typeof and instanceof keywords by
inspecting the name of the variable's constructor.
The StackTrace class provides a stack trace for the other functions.
Installation
The softlib library may be installed directly from github or via
NPM.
To add the library to a node.js project, use this command:
[user@host]# npm install softlib
import {expect} from 'softlib'; import {aver} from 'softlib'; import {terminal} from 'softlib'; import {vartype} from 'softlib';
To add the library to a browser project, use this command:
[user@host]# git clone https://github.com/readwritetools/softlib.git
import {expect} from '/softlib/expect.js'; import {aver} from '/softlib/aver.js'; import {terminal} from '/softlib/terminal.js'; import {vartype} from '/softlib/vartype.js';
Metadata
Module exports
ES modulestrue
Common JSfalse
Suitability
BrowserAPI
node.jsAPI
Availability
Read Write Hub logoDocumentationRead Write Hub
git logoSource codegithub
npm logoPackage installationnpm
License
The softlib library is licensed under the MIT License.
MIT License
Copyright © 2023 Read Write Tools.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
About
Dynamic code for type expectations, soft assertions, and logging to the terminal with stack trace.
Resources
Readme
MIT license
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
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// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - readwritetools/softlib: Dynamic code for type expectations, soft assertions, and logging to the terminal with stack trace. · GitHub
Skip to content
BranchesTags
Repository files navigation
html
Contract by Design
Softlib
Runtime code safety and sanity checking
 by Read Write Tools Sep 13, 2015

Abstract
The softlib JavaScript library has functions for type expectations, soft assertions, and logging to the terminal with stack trace.
Motivation
Before typescript came on the scene this library was a good way to reliably
verify that function inputs were in their expected form. It continues to be an
essential library for software written in pure ECMAScript.
Features
The expect function provides runtime type safety without the overhead of a
precompiler. It provides a strong measure of safety during execution by
providing an early warning system when things aren't proceeding as expected.
The aver function is a soft assertion. When conditions should be true, an aver()
can alert the developer that things haven't lived up to their promise. This is
done in a non-fatal way, allowing the condition to persist (even when the aver
fails) letting the code deal with the condition using whatever coding paradigm
is in force, such as a try/finally block or other exception/error handling
techniques.
The terminal function provides context sensitive logging. When reached via a
browser, output is routed to the console as a warn() or error(). When reached
via a node.js process, output is routed to stdout or stderr.
The vartype function provides dynamic introspection of a variable's current
type. It goes beyond ECMAScript's native typeof and instanceof keywords by
inspecting the name of the variable's constructor.
The StackTrace class provides a stack trace for the other functions.
Installation
The softlib library may be installed directly from github or via
NPM.
To add the library to a node.js project, use this command:
[user@host]# npm install softlib
import {expect} from 'softlib'; import {aver} from 'softlib'; import {terminal} from 'softlib'; import {vartype} from 'softlib';
To add the library to a browser project, use this command:
[user@host]# git clone https://github.com/readwritetools/softlib.git
import {expect} from '/softlib/expect.js'; import {aver} from '/softlib/aver.js'; import {terminal} from '/softlib/terminal.js'; import {vartype} from '/softlib/vartype.js';
Metadata
Module exports
ES modulestrue
Common JSfalse
Suitability
BrowserAPI
node.jsAPI
Availability
Read Write Hub logoDocumentationRead Write Hub
git logoSource codegithub
npm logoPackage installationnpm
License
The softlib library is licensed under the MIT License.
MIT License
Copyright © 2023 Read Write Tools.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - readwritetools/softlib: Dynamic code for type expectations, soft assertions, and logging to the terminal with stack trace. · GitHub
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Contract by Design
Softlib
Runtime code safety and sanity checking
 by Read Write Tools Sep 13, 2015

Abstract
The softlib JavaScript library has functions for type expectations, soft assertions, and logging to the terminal with stack trace.
Motivation
Before typescript came on the scene this library was a good way to reliably
verify that function inputs were in their expected form. It continues to be an
essential library for software written in pure ECMAScript.
Features
The expect function provides runtime type safety without the overhead of a
precompiler. It provides a strong measure of safety during execution by
providing an early warning system when things aren't proceeding as expected.
The aver function is a soft assertion. When conditions should be true, an aver()
can alert the developer that things haven't lived up to their promise. This is
done in a non-fatal way, allowing the condition to persist (even when the aver
fails) letting the code deal with the condition using whatever coding paradigm
is in force, such as a try/finally block or other exception/error handling
techniques.
The terminal function provides context sensitive logging. When reached via a
browser, output is routed to the console as a warn() or error(). When reached
via a node.js process, output is routed to stdout or stderr.
The vartype function provides dynamic introspection of a variable's current
type. It goes beyond ECMAScript's native typeof and instanceof keywords by
inspecting the name of the variable's constructor.
The StackTrace class provides a stack trace for the other functions.
Installation
The softlib library may be installed directly from github or via
NPM.
To add the library to a node.js project, use this command:
[user@host]# npm install softlib
import {expect} from 'softlib'; import {aver} from 'softlib'; import {terminal} from 'softlib'; import {vartype} from 'softlib';
To add the library to a browser project, use this command:
[user@host]# git clone https://github.com/readwritetools/softlib.git
import {expect} from '/softlib/expect.js'; import {aver} from '/softlib/aver.js'; import {terminal} from '/softlib/terminal.js'; import {vartype} from '/softlib/vartype.js';
Metadata
Module exports
ES modulestrue
Common JSfalse
Suitability
BrowserAPI
node.jsAPI
Availability
Read Write Hub logoDocumentationRead Write Hub
git logoSource codegithub
npm logoPackage installationnpm
License
The softlib library is licensed under the MIT License.
MIT License
Copyright © 2023 Read Write Tools.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
About
Dynamic code for type expectations, soft assertions, and logging to the terminal with stack trace.
Resources
Readme
MIT license
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
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0 forks
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Used by
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, 'i');
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background: #1a1a2e !important;
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filter: invert(1) hue-rotate(180deg) !important;
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.monaco-editor, .monaco-editor *,
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pre code, pre code * {
filter: none !important;
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/* Fix common UI elements */
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filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
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::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
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var style = document.getElementById('universal-dark-mode-style');
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removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
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applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
GitHub - readwritetools/softlib: Dynamic code for type expectations, soft assertions, and logging to the terminal with stack trace. · GitHub
Skip to content
BranchesTags
Repository files navigation
html
Contract by Design
Softlib
Runtime code safety and sanity checking
 by Read Write Tools Sep 13, 2015

Abstract
The softlib JavaScript library has functions for type expectations, soft assertions, and logging to the terminal with stack trace.
Motivation
Before typescript came on the scene this library was a good way to reliably
verify that function inputs were in their expected form. It continues to be an
essential library for software written in pure ECMAScript.
Features
The expect function provides runtime type safety without the overhead of a
precompiler. It provides a strong measure of safety during execution by
providing an early warning system when things aren't proceeding as expected.
The aver function is a soft assertion. When conditions should be true, an aver()
can alert the developer that things haven't lived up to their promise. This is
done in a non-fatal way, allowing the condition to persist (even when the aver
fails) letting the code deal with the condition using whatever coding paradigm
is in force, such as a try/finally block or other exception/error handling
techniques.
The terminal function provides context sensitive logging. When reached via a
browser, output is routed to the console as a warn() or error(). When reached
via a node.js process, output is routed to stdout or stderr.
The vartype function provides dynamic introspection of a variable's current
type. It goes beyond ECMAScript's native typeof and instanceof keywords by
inspecting the name of the variable's constructor.
The StackTrace class provides a stack trace for the other functions.
Installation
The softlib library may be installed directly from github or via
NPM.
To add the library to a node.js project, use this command:
[user@host]# npm install softlib
import {expect} from 'softlib'; import {aver} from 'softlib'; import {terminal} from 'softlib'; import {vartype} from 'softlib';
To add the library to a browser project, use this command:
[user@host]# git clone https://github.com/readwritetools/softlib.git
import {expect} from '/softlib/expect.js'; import {aver} from '/softlib/aver.js'; import {terminal} from '/softlib/terminal.js'; import {vartype} from '/softlib/vartype.js';
Metadata
Module exports
ES modulestrue
Common JSfalse
Suitability
BrowserAPI
node.jsAPI
Availability
Read Write Hub logoDocumentationRead Write Hub
git logoSource codegithub
npm logoPackage installationnpm
License
The softlib library is licensed under the MIT License.
MIT License
Copyright © 2023 Read Write Tools.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
About
Dynamic code for type expectations, soft assertions, and logging to the terminal with stack trace.
Resources
Readme
MIT license
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages