Currently this is possible with typescript decorators using proxies with.

function hookable<T extends Function>(target: T): T
{
    const handler: ProxyHandler<T> =
    {
        construct: (target, args, newTarget) =>
        {
            const instance = Reflect.construct(target, args, newTarget);

            instance.finisher(); // Or any other solution

            return instance;
        },
    };

    return new Proxy(target, handler);
}

@hookable
class Foo
{
    public constructor()
    {
        console.log("constructor");
    }

    public finisher(): void
    {
        console.log("finisher");
    }
}

new Foo(); //Prints: "constructor", "finisher"

As shown in #342, we can create a decorator that can initialize things lazily within set or get.

Maybe it would be convenient to have a built-in @lazy decorator that makes the initializer lazy (on first get, unless set has already been triggered).

Here's practical use case example with Custom Elements:

The following has a runtime error, the subclass can not override the superclass property because this.attachShadow always throws if it is called more than once (and element can only have one ShadowRoot):

class Component extends HTMLElement {
  renderRoot = this.attachShadow({mode: 'open'})

  connectedCallback() {
    console.log(this.renderRoot)
  }

  // ...
}

class MyClass extends Component {
  renderRoot = this.attachShadow({mode: 'closed'}) // runtime error, super class already called this.attachShadow, an unwanted side-effect.
  // ...
}

Solved with @lazy:

class Component extends HTMLElement {
  @lazy renderRoot = this.attachShadow({mode: 'open'})

  connectedCallback() {
    console.log(this.renderRoot)
  }

  // ...
}

class MyClass extends Component {
  @lazy renderRoot = this.attachShadow({mode: 'closed'}) // runtime error, super class already called this.attachShadow, an unwanted side-effect.
  // ...
}

Now it works, because when connectedCallback finally runs at some time after construction, it will read the subclass renderRoot property, at which point the subclass initializer will run, and therefore this.attachShadow will have been called only once using the subclass' version, and the act of "overriding" a super class property was successful.

The unfortunate thing with class fields (and no use of decorators for help) is that they do not "override" superclass fields of the same name.

Issue https://github.com/tc39/proposal-decorators/issues/342 shows one way to modify a class' shape to anything you want using the currently spec'd decorators.

This wouldn't change anything about how classes work. The various forms of the idea above are all syntax sugar, and would behave identical to this one:

class MyEl extends HTMLElement {
  featureA = new FeatureA
  featureB = new FeatureB
  featureC = new FeatureC

  connectedCallback() {
    this.featureA.run(this)
    this.featureB.run(this)
    this.featureC.run(this)
  }

  disconnectedCallback() {
    this.featureA.stop(this)
    this.featureB.stop(this)
    this.featureC.stop(this)
  }
}

But perhaps the idea isn't that useful enough to warrant introducing it. Maybe just breaking classes up into smaller classes is better.

I too suspect perhaps this is something for EXTENSIONS.md.

I want to leave this feature for a follow-on proposal.

Willing to take a PR for EXTENSIONS.md?

Bumps highlight.js from 9.18.1 to 9.18.5. <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/highlightjs/highlight.js/blob/9.18.5/CHANGES.md">highlight.js's changelog</a>.</em></p> <blockquote> <h2>Release v9.18.5</h2> <p><strong>Version 9 has reached end-of-support and will not receive future updates or fixes.</strong></p> <p>Please see <a href="https://github.com/highlightjs/highlight.js/blob/master/VERSION_10_UPGRADE.md">VERSION_10_UPGRADE.md</a> and perhaps <a href="https://github.com/highlightjs/highlight.js/blob/master/SECURITY.md">SECURITY.md</a>.</p> <ul> <li>enh: Post-install script can be disabled with <code>HLJS_HIDE_UPGRADE_WARNING=yes</code></li> <li>fix: Deprecation notice logged at library startup a <code>console.log</code> vs <code>console.warn</code>. <ul> <li>Notice only shown if actually highlighting code, not just requiring the library.</li> <li>Node.js treats <code>warn</code> the same as <code>error</code> and that was problematic.</li> <li>You (or perhaps your indirect dependency) may disable the notice with the <code>hideUpgradeWarningAcceptNoSupportOrSecurityUpdates</code> option</li> <li>You can also set <code>HLJS_HIDE_UPGRADE_WARNING=yes</code> in your envionment to disable the warning</li> </ul> </li> </ul> <p>Example:</p> <pre lang="js"><code>hljs.configure({ hideUpgradeWarningAcceptNoSupportOrSecurityUpdates: true }) </code></pre> <p>Reference: <a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/issues/2877">highlightjs/highlight.js#2877</a></p> <h2>Release v9.18.4</h2> <p><strong>Version 9 has reached end-of-support and will not receive future updates or fixes.</strong></p> <p>Please see <a href="https://github.com/highlightjs/highlight.js/blob/master/VERSION_10_UPGRADE.md">VERSION_10_UPGRADE.md</a> and perhaps <a href="https://github.com/highlightjs/highlight.js/blob/master/SECURITY.md">SECURITY.md</a>.</p> <ul> <li>fix(livescript) fix potential catastrophic backtracking (<a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/pull/2852">#2852</a>) [<a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/pull/2852/commits/ebaf171d2b3a21961b605aa6173a6a4c57346194">commit</a>]</li> </ul> <h2>Version 9.18.3</h2> <ul> <li>fix(parser) Freezing issue with illegal 0 width illegals (<a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/issues/2524">#2524</a>) <ul> <li>backported from v10.x</li> </ul> </li> </ul> <h2>Version 9.18.2</h2> <p>Fixes:</p> <ul> <li>fix(night) Prevent object prototype values from being returned by <code>getLanguage</code> (<a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/issues/2636">#2636</a>) <a href="https://github.com/night">night</a></li> </ul> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/highlightjs/highlight.js/commit/f54e96c24325f077a027bb950dcd9f8f3ef48b16"><code>f54e96c</code></a> 9.18.5</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/c34318b6a720a0852d27cd13dc55ca896e1292ec"><code>c34318b</code></a> fix the link since i saw it</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/d2e9bdd7597e308534fc2b0fc4aa2f935895a45d"><code>d2e9bdd</code></a> include date of last release</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/f5e06454216644cf20d7c9275d42e37707281a8e"><code>f5e0645</code></a> typos and tweaks</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/2e0e8ee996eb5b3f5c4ab25b60d910690a0e7258"><code>2e0e8ee</code></a> changelog</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/dc45f7cd21fe51a4cbb23fb36459982d1e06a6d5"><code>dc45f7c</code></a> fix(livescript) fix potential catastrophic backtracking</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/0a2624afb8dc71ef01815b49709481f06914474a"><code>0a2624a</code></a> update readme</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/d571b235c0c079ef971965a5a540eec5d68b531c"><code>d571b23</code></a> add warning</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/ec0bfd5490ca1ec667c9c2b528b364f10b9ea71d"><code>ec0bfd5</code></a> 9.18.4</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/2a04835c959f0adb18e7a3649aa68350c0286101"><code>2a04835</code></a> bump v9.18.3</li> <li>Additional commits viewable in <a href="https://github.com/highlightjs/highlight.js/compare/9.18.1...9.18.5">compare view</a></li> </ul> </details> <br />

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Bumps highlight.js from 9.18.1 to 9.18.5. <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/highlightjs/highlight.js/blob/9.18.5/CHANGES.md">highlight.js's changelog</a>.</em></p> <blockquote> <h2>Release v9.18.5</h2> <p><strong>Version 9 has reached end-of-support and will not receive future updates or fixes.</strong></p> <p>Please see <a href="https://github.com/highlightjs/highlight.js/blob/master/VERSION_10_UPGRADE.md">VERSION_10_UPGRADE.md</a> and perhaps <a href="https://github.com/highlightjs/highlight.js/blob/master/SECURITY.md">SECURITY.md</a>.</p> <ul> <li>enh: Post-install script can be disabled with <code>HLJS_HIDE_UPGRADE_WARNING=yes</code></li> <li>fix: Deprecation notice logged at library startup a <code>console.log</code> vs <code>console.warn</code>. <ul> <li>Notice only shown if actually highlighting code, not just requiring the library.</li> <li>Node.js treats <code>warn</code> the same as <code>error</code> and that was problematic.</li> <li>You (or perhaps your indirect dependency) may disable the notice with the <code>hideUpgradeWarningAcceptNoSupportOrSecurityUpdates</code> option</li> <li>You can also set <code>HLJS_HIDE_UPGRADE_WARNING=yes</code> in your envionment to disable the warning</li> </ul> </li> </ul> <p>Example:</p> <pre lang="js"><code>hljs.configure({ hideUpgradeWarningAcceptNoSupportOrSecurityUpdates: true }) </code></pre> <p>Reference: <a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/issues/2877">highlightjs/highlight.js#2877</a></p> <h2>Release v9.18.4</h2> <p><strong>Version 9 has reached end-of-support and will not receive future updates or fixes.</strong></p> <p>Please see <a href="https://github.com/highlightjs/highlight.js/blob/master/VERSION_10_UPGRADE.md">VERSION_10_UPGRADE.md</a> and perhaps <a href="https://github.com/highlightjs/highlight.js/blob/master/SECURITY.md">SECURITY.md</a>.</p> <ul> <li>fix(livescript) fix potential catastrophic backtracking (<a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/pull/2852">#2852</a>) [<a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/pull/2852/commits/ebaf171d2b3a21961b605aa6173a6a4c57346194">commit</a>]</li> </ul> <h2>Version 9.18.3</h2> <ul> <li>fix(parser) Freezing issue with illegal 0 width illegals (<a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/issues/2524">#2524</a>) <ul> <li>backported from v10.x</li> </ul> </li> </ul> <h2>Version 9.18.2</h2> <p>Fixes:</p> <ul> <li>fix(night) Prevent object prototype values from being returned by <code>getLanguage</code> (<a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/issues/2636">#2636</a>) <a href="https://github.com/night">night</a></li> </ul> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/highlightjs/highlight.js/commit/f54e96c24325f077a027bb950dcd9f8f3ef48b16"><code>f54e96c</code></a> 9.18.5</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/c34318b6a720a0852d27cd13dc55ca896e1292ec"><code>c34318b</code></a> fix the link since i saw it</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/d2e9bdd7597e308534fc2b0fc4aa2f935895a45d"><code>d2e9bdd</code></a> include date of last release</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/f5e06454216644cf20d7c9275d42e37707281a8e"><code>f5e0645</code></a> typos and tweaks</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/2e0e8ee996eb5b3f5c4ab25b60d910690a0e7258"><code>2e0e8ee</code></a> changelog</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/dc45f7cd21fe51a4cbb23fb36459982d1e06a6d5"><code>dc45f7c</code></a> fix(livescript) fix potential catastrophic backtracking</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/0a2624afb8dc71ef01815b49709481f06914474a"><code>0a2624a</code></a> update readme</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/d571b235c0c079ef971965a5a540eec5d68b531c"><code>d571b23</code></a> add warning</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/ec0bfd5490ca1ec667c9c2b528b364f10b9ea71d"><code>ec0bfd5</code></a> 9.18.4</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/2a04835c959f0adb18e7a3649aa68350c0286101"><code>2a04835</code></a> bump v9.18.3</li> <li>Additional commits viewable in <a href="https://github.com/highlightjs/highlight.js/compare/9.18.1...9.18.5">compare view</a></li> </ul> </details> <br />

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Bumps highlight.js from 9.18.1 to 9.18.5. <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/highlightjs/highlight.js/blob/9.18.5/CHANGES.md">highlight.js's changelog</a>.</em></p> <blockquote> <h2>Release v9.18.5</h2> <p><strong>Version 9 has reached end-of-support and will not receive future updates or fixes.</strong></p> <p>Please see <a href="https://github.com/highlightjs/highlight.js/blob/master/VERSION_10_UPGRADE.md">VERSION_10_UPGRADE.md</a> and perhaps <a href="https://github.com/highlightjs/highlight.js/blob/master/SECURITY.md">SECURITY.md</a>.</p> <ul> <li>enh: Post-install script can be disabled with <code>HLJS_HIDE_UPGRADE_WARNING=yes</code></li> <li>fix: Deprecation notice logged at library startup a <code>console.log</code> vs <code>console.warn</code>. <ul> <li>Notice only shown if actually highlighting code, not just requiring the library.</li> <li>Node.js treats <code>warn</code> the same as <code>error</code> and that was problematic.</li> <li>You (or perhaps your indirect dependency) may disable the notice with the <code>hideUpgradeWarningAcceptNoSupportOrSecurityUpdates</code> option</li> <li>You can also set <code>HLJS_HIDE_UPGRADE_WARNING=yes</code> in your envionment to disable the warning</li> </ul> </li> </ul> <p>Example:</p> <pre lang="js"><code>hljs.configure({ hideUpgradeWarningAcceptNoSupportOrSecurityUpdates: true }) </code></pre> <p>Reference: <a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/issues/2877">highlightjs/highlight.js#2877</a></p> <h2>Release v9.18.4</h2> <p><strong>Version 9 has reached end-of-support and will not receive future updates or fixes.</strong></p> <p>Please see <a href="https://github.com/highlightjs/highlight.js/blob/master/VERSION_10_UPGRADE.md">VERSION_10_UPGRADE.md</a> and perhaps <a href="https://github.com/highlightjs/highlight.js/blob/master/SECURITY.md">SECURITY.md</a>.</p> <ul> <li>fix(livescript) fix potential catastrophic backtracking (<a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/pull/2852">#2852</a>) [<a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/pull/2852/commits/ebaf171d2b3a21961b605aa6173a6a4c57346194">commit</a>]</li> </ul> <h2>Version 9.18.3</h2> <ul> <li>fix(parser) Freezing issue with illegal 0 width illegals (<a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/issues/2524">#2524</a>) <ul> <li>backported from v10.x</li> </ul> </li> </ul> <h2>Version 9.18.2</h2> <p>Fixes:</p> <ul> <li>fix(night) Prevent object prototype values from being returned by <code>getLanguage</code> (<a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/issues/2636">#2636</a>) <a href="https://github.com/night">night</a></li> </ul> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/highlightjs/highlight.js/commit/f54e96c24325f077a027bb950dcd9f8f3ef48b16"><code>f54e96c</code></a> 9.18.5</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/c34318b6a720a0852d27cd13dc55ca896e1292ec"><code>c34318b</code></a> fix the link since i saw it</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/d2e9bdd7597e308534fc2b0fc4aa2f935895a45d"><code>d2e9bdd</code></a> include date of last release</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/f5e06454216644cf20d7c9275d42e37707281a8e"><code>f5e0645</code></a> typos and tweaks</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/2e0e8ee996eb5b3f5c4ab25b60d910690a0e7258"><code>2e0e8ee</code></a> changelog</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/dc45f7cd21fe51a4cbb23fb36459982d1e06a6d5"><code>dc45f7c</code></a> fix(livescript) fix potential catastrophic backtracking</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/0a2624afb8dc71ef01815b49709481f06914474a"><code>0a2624a</code></a> update readme</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/d571b235c0c079ef971965a5a540eec5d68b531c"><code>d571b23</code></a> add warning</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/ec0bfd5490ca1ec667c9c2b528b364f10b9ea71d"><code>ec0bfd5</code></a> 9.18.4</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/2a04835c959f0adb18e7a3649aa68350c0286101"><code>2a04835</code></a> bump v9.18.3</li> <li>Additional commits viewable in <a href="https://github.com/highlightjs/highlight.js/compare/9.18.1...9.18.5">compare view</a></li> </ul> </details> <br />

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Bumps highlight.js from 9.15.8 to 9.18.5. <details> <summary>Release notes</summary> <p><em>Sourced from <a href="https://github.com/highlightjs/highlight.js/releases">highlight.js's releases</a>.</em></p> <blockquote> <h2>10.3.2 - Oops, "Javascript".</h2> <p>Tiny tiny release, just to fix the website incorrectly not listing Javascript in the list of languages you could choose for a custom build. NPM and CDN build should not have been affected so 10.3.1 is effectively the same as 10.3.2 for those builds.</p> <p>If you made a custom build from the website with 10.3 or 10.3.1 you may want to check and make sure it includes Javascript, and if not, build it again.</p> <h2>9.18.1 - Brrrrr, it’s freezing.</h2> <p>Quick release to resolve <a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/issues/2375">#2375</a></p> </blockquote> </details> <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/highlightjs/highlight.js/blob/9.18.5/CHANGES.md">highlight.js's changelog</a>.</em></p> <blockquote> <h2>Release v9.18.5</h2> <p><strong>Version 9 has reached end-of-support and will not receive future updates or fixes.</strong></p> <p>Please see <a href="https://github.com/highlightjs/highlight.js/blob/master/VERSION_10_UPGRADE.md">VERSION_10_UPGRADE.md</a> and perhaps <a href="https://github.com/highlightjs/highlight.js/blob/master/SECURITY.md">SECURITY.md</a>.</p> <ul> <li>enh: Post-install script can be disabled with <code>HLJS_HIDE_UPGRADE_WARNING=yes</code></li> <li>fix: Deprecation notice logged at library startup a <code>console.log</code> vs <code>console.warn</code>. <ul> <li>Notice only shown if actually highlighting code, not just requiring the library.</li> <li>Node.js treats <code>warn</code> the same as <code>error</code> and that was problematic.</li> <li>You (or perhaps your indirect dependency) may disable the notice with the <code>hideUpgradeWarningAcceptNoSupportOrSecurityUpdates</code> option</li> <li>You can also set <code>HLJS_HIDE_UPGRADE_WARNING=yes</code> in your envionment to disable the warning</li> </ul> </li> </ul> <p>Example:</p> <pre lang="js"><code>hljs.configure({ hideUpgradeWarningAcceptNoSupportOrSecurityUpdates: true }) </code></pre> <p>Reference: <a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/issues/2877">highlightjs/highlight.js#2877</a></p> <h2>Release v9.18.4</h2> <p><strong>Version 9 has reached end-of-support and will not receive future updates or fixes.</strong></p> <p>Please see <a href="https://github.com/highlightjs/highlight.js/blob/master/VERSION_10_UPGRADE.md">VERSION_10_UPGRADE.md</a> and perhaps <a href="https://github.com/highlightjs/highlight.js/blob/master/SECURITY.md">SECURITY.md</a>.</p> <ul> <li>fix(livescript) fix potential catastrophic backtracking (<a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/pull/2852">#2852</a>) [<a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/pull/2852/commits/ebaf171d2b3a21961b605aa6173a6a4c57346194">commit</a>]</li> </ul> <h2>Version 9.18.3</h2> <ul> <li>fix(parser) Freezing issue with illegal 0 width illegals (<a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/issues/2524">#2524</a>) <ul> <li>backported from v10.x</li> </ul> </li> </ul> <h2>Version 9.18.2</h2> <p>Fixes:</p> <ul> <li>fix(night) Prevent object prototype values from being returned by <code>getLanguage</code> (<a href="https://github-redirect.dependabot.com/highlightjs/highlight.js/issues/2636">#2636</a>) <a href="https://github.com/night">night</a></li> </ul> <!-- raw HTML omitted --> </blockquote> <p>... (truncated)</p> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/highlightjs/highlight.js/commit/f54e96c24325f077a027bb950dcd9f8f3ef48b16"><code>f54e96c</code></a> 9.18.5</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/c34318b6a720a0852d27cd13dc55ca896e1292ec"><code>c34318b</code></a> fix the link since i saw it</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/d2e9bdd7597e308534fc2b0fc4aa2f935895a45d"><code>d2e9bdd</code></a> include date of last release</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/f5e06454216644cf20d7c9275d42e37707281a8e"><code>f5e0645</code></a> typos and tweaks</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/2e0e8ee996eb5b3f5c4ab25b60d910690a0e7258"><code>2e0e8ee</code></a> changelog</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/dc45f7cd21fe51a4cbb23fb36459982d1e06a6d5"><code>dc45f7c</code></a> fix(livescript) fix potential catastrophic backtracking</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/0a2624afb8dc71ef01815b49709481f06914474a"><code>0a2624a</code></a> update readme</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/d571b235c0c079ef971965a5a540eec5d68b531c"><code>d571b23</code></a> add warning</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/ec0bfd5490ca1ec667c9c2b528b364f10b9ea71d"><code>ec0bfd5</code></a> 9.18.4</li> <li><a href="https://github.com/highlightjs/highlight.js/commit/2a04835c959f0adb18e7a3649aa68350c0286101"><code>2a04835</code></a> bump v9.18.3</li> <li>Additional commits viewable in <a href="https://github.com/highlightjs/highlight.js/compare/9.15.8...9.18.5">compare view</a></li> </ul> </details> <br />

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@rbuckton

Hi there, Please tag the new version of reflect-metadata (0.1.13) in this github repository... We want to pack your awesome project to Debian. Without tagging new release in this repository, we cant do that...So please solve this ASAP...

Thanks,

VIVEK K J

"d" and "o" flags both already exist for Perl regular expressions, although even their own documentation denigrates them severely: https://perldoc.perl.org/perlre#Modifiers . None of the flag options seem great to me, though. I would personally be fine with the stay-the-course (4), and unhappy with the symmetry-breaking (2) and (3).

Given that Perl perl documentation denigrates both the /d and /o flags, that eliminates any barriers for using them as JavaScript RegExp flags to me. We certainly wouldn't add to JavaScript either /d, the the old, problematic, pre-5.14 Default character set behavior or /o, the compile once flag, as that is an implementation detail.

Option (2) has ergonomic issues for some fonts and (3) would eliminate the use in RegExp literals.

The (4) stay-the-course will likely hinder the uptake of this feature.