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padding-bottom--lg"><div class="row"><div class="col docItemCol_n6xZ"><div class="docItemContainer_RhpI"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Wvrh" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_uaSn"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Miscellaneous</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">📦 logger</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_BEWm theme-doc-toc-mobile tocMobile_NSfz"><button type="button" class="clean-btn tocCollapsibleButton_IbtT">On this page</button></div><div class="theme-doc-markdown markdown"><h1>📦 logger</h1>
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<p>An encapsulated logger for semantically formatting console messages.</p>
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<p>Authors of packages in the Docusaurus ecosystem are encouraged to use this package to provide unified log formats.</p>
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<h2 class="anchor anchorWithHideOnScrollNavbar_SSbb" id="apis">APIs<a href="#apis" class="hash-link" aria-label="Direct link to APIs" title="Direct link to APIs"></a></h2>
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<p>It exports a single object as default export: <code>logger</code>. <code>logger</code> has the following properties:</p>
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<ul>
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<li>Some useful colors.<!-- -->
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<ul>
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<li><code>red</code></li>
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<li><code>yellow</code></li>
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<li><code>green</code></li>
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<li><code>bold</code></li>
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<li><code>dim</code></li>
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</ul>
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</li>
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<li>Formatters. These functions all have the signature <code>(msg: unknown) => string</code>. Note that their implementations are not guaranteed. You should only care about their semantics.<!-- -->
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<ul>
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<li><code>path</code>: formats a file path.</li>
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<li><code>url</code>: formats a URL.</li>
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<li><code>name</code>: formats an identifier.</li>
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<li><code>code</code>: formats a code snippet.</li>
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<li><code>subdue</code>: subdues the text.</li>
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<li><code>num</code>: formats a number.</li>
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</ul>
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</li>
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<li>The <code>interpolate</code> function. It is a template literal tag. The syntax can be found below.</li>
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<li>Logging functions. All logging functions can both be used as normal functions (similar to the <code>console.log</code> family, but only accepts one parameter) or template literal tags.<!-- -->
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<ul>
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<li><code>info</code>: prints information.</li>
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<li><code>warn</code>: prints a warning that should be paid attention to.</li>
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<li><code>error</code>: prints an error (not necessarily halting the program) that signals significant problems.</li>
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<li><code>success</code>: prints a success message.</li>
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</ul>
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||
</li>
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<li>The <code>report</code> function. It takes a <code>ReportingSeverity</code> value (<code>ignore</code>, <code>log</code>, <code>warn</code>, <code>throw</code>) and reports a message according to the severity.</li>
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</ul>
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<div class="theme-admonition theme-admonition-warning admonition_o5H7 alert alert--warning"><div class="admonitionHeading_FzoX"><span class="admonitionIcon_rXq6"><svg viewBox="0 0 16 16"><path fill-rule="evenodd" d="M8.893 1.5c-.183-.31-.52-.5-.887-.5s-.703.19-.886.5L.138 13.499a.98.98 0 0 0 0 1.001c.193.31.53.501.886.501h13.964c.367 0 .704-.19.877-.5a1.03 1.03 0 0 0 .01-1.002L8.893 1.5zm.133 11.497H6.987v-2.003h2.039v2.003zm0-3.004H6.987V5.987h2.039v4.006z"></path></svg></span>A word on the <code>error</code> formatter</div><div class="admonitionContent_Knsx"><p>Beware that an <code>error</code> message, even when it doesn't hang the program, is likely going to cause confusion. When users inspect logs and find an <code>[ERROR]</code>, even when the build succeeds, they will assume something is going wrong. Use it sparingly.</p><p>Docusaurus only uses <code>logger.error</code> when printing messages immediately before throwing an error, or when user has set the reporting severity of <code>onBrokenLink</code>, etc. to <code>"error"</code>.</p><p>In addition, <code>warn</code> and <code>error</code> will color the <strong>entire</strong> message for better attention. If you are printing large blocks of help text about an error, better use <code>logger.info</code>.</p></div></div>
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<h3 class="anchor anchorWithHideOnScrollNavbar_SSbb" id="using-the-template-literal-tag">Using the template literal tag<a href="#using-the-template-literal-tag" class="hash-link" aria-label="Direct link to Using the template literal tag" title="Direct link to Using the template literal tag"></a></h3>
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<p>The template literal tag evaluates the template and expressions embedded. <code>interpolate</code> returns a new string, while other logging functions prints it. Below is a typical usage:</p>
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||
<div class="language-js codeBlockContainer_jDV4 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_vx7S"><pre tabindex="0" class="prism-code language-js codeBlock_Gebt thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_FJaf"><span class="token-line" style="color:#393A34"><span class="token keyword module" style="color:#CF222E">import</span><span class="token plain"> </span><span class="token imports">logger</span><span class="token plain"> </span><span class="token keyword module" style="color:#CF222E">from</span><span class="token plain"> </span><span class="token string" style="color:#C6105F">'@docusaurus/logger'</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">logger</span><span class="token punctuation" style="color:#393A34">.</span><span class="token property-access">info</span><span class="token template-string template-punctuation string" style="color:#C6105F">`</span><span class="token template-string string" style="color:#C6105F">Hello name=</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">${</span><span class="token template-string interpolation">name</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">}</span><span class="token template-string string" style="color:#C6105F">! You have number=</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">${</span><span class="token template-string interpolation">money</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">}</span><span class="token template-string string" style="color:#C6105F"> dollars. Here are the </span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">${</span><span class="token template-string interpolation"></span><br></span><span class="token-line" style="color:#393A34"><span class="token template-string interpolation"> items</span><span class="token template-string interpolation punctuation" style="color:#393A34">.</span><span class="token template-string interpolation property-access">length</span><span class="token template-string interpolation"> </span><span class="token template-string interpolation operator" style="color:#D73A49">></span><span class="token template-string interpolation"> </span><span class="token template-string interpolation number" style="color:#005CC5">1</span><span class="token template-string interpolation"> </span><span class="token template-string interpolation operator" style="color:#D73A49">?</span><span class="token template-string interpolation"> </span><span class="token template-string interpolation string" style="color:#C6105F">'items'</span><span class="token template-string interpolation"> </span><span class="token template-string interpolation operator" style="color:#D73A49">:</span><span class="token template-string interpolation"> </span><span class="token template-string interpolation string" style="color:#C6105F">'item'</span><span class="token template-string interpolation"></span><br></span><span class="token-line" style="color:#393A34"><span class="token template-string interpolation"></span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">}</span><span class="token template-string string" style="color:#C6105F"> on the shelf: </span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">${</span><span class="token template-string interpolation">items</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">}</span><span class="token template-string string" style="color:#C6105F"></span><br></span><span class="token-line" style="color:#393A34"><span class="token template-string string" style="color:#C6105F">To buy anything, enter code=</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">${</span><span class="token template-string interpolation string" style="color:#C6105F">'buy x'</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">}</span><span class="token template-string string" style="color:#C6105F"> where code=</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">${</span><span class="token template-string interpolation string" style="color:#C6105F">'x'</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">}</span><span class="token template-string string" style="color:#C6105F"> is the item's name; to quit, press code=</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">${</span><span class="token template-string interpolation string" style="color:#C6105F">'Ctrl + C'</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">}</span><span class="token template-string string" style="color:#C6105F">.</span><span class="token template-string template-punctuation string" style="color:#C6105F">`</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup_cUGO"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_OqsO" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_PgCn"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_bsQG"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
|
||
<p>An embedded expression is optionally preceded by a flag in the form <code>[a-z]+=</code> (a few lowercase letters, followed by an equals sign, directly preceding the embedded expression). If the expression is not preceded by any flag, it's printed out as-is. Otherwise, it's formatted with one of the formatters:</p>
|
||
<ul>
|
||
<li><code>path=</code>: <code>path</code></li>
|
||
<li><code>url=</code>: <code>url</code></li>
|
||
<li><code>name=</code>: <code>name</code></li>
|
||
<li><code>code=</code>: <code>code</code></li>
|
||
<li><code>subdue=</code>: <code>subdue</code></li>
|
||
<li><code>number=</code>: <code>num</code></li>
|
||
</ul>
|
||
<p>If the expression is an array, it's formatted by <code>`\n- ${array.join('\n- ')}\n`</code> (note it automatically gets a leading line end). Each member is formatted by itself and the bullet is not formatted. So you would see the above message printed as:</p>
|
||
<p><img decoding="async" loading="lazy" alt="Some text output in the terminal, containing array, code, name, and number formatting" src="/assets/images/demo-0e309a1a631b58ebe6d5f2d8014351e8.png" width="1234" height="150" class="img_vXGZ"></p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class="col"><a href="https://github.com/facebook/docusaurus/edit/main/website/docs/api/misc/logger/logger.mdx" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_IMw_" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_OHCJ"><span class="theme-last-updated">Last updated<!-- --> on <b><time datetime="2023-09-15T08:48:21.000Z" itemprop="dateModified">Sep 15, 2023</time></b> by <b>Sébastien Lorber</b></span></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/api/misc/@docusaurus/eslint-plugin/string-literal-i18n-messages"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">string-literal-i18n-messages</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_RLlU thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#apis" class="table-of-contents__link toc-highlight">APIs</a><ul><li><a href="#using-the-template-literal-tag" class="table-of-contents__link toc-highlight">Using the template literal tag</a></li></ul></li></ul></div></div></div></div></main></div></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Learn</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/docs">Introduction</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/installation">Installation</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/migration">Migration from v1 to v2</a></li></ul></div><div class="col footer__col"><div class="footer__title">Community</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://stackoverflow.com/questions/tagged/docusaurus" target="_blank" rel="noopener noreferrer" class="footer__link-item">Stack Overflow<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_Rdzz"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a class="footer__link-item" href="/feature-requests">Feature Requests</a></li><li class="footer__item"><a href="https://discordapp.com/invite/docusaurus" target="_blank" rel="noopener noreferrer" class="footer__link-item">Discord<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_Rdzz"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a class="footer__link-item" href="/community/support">Help</a></li></ul></div><div class="col footer__col"><div class="footer__title">More</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/blog">Blog</a></li><li class="footer__item"><a class="footer__link-item" href="/changelog">Changelog</a></li><li class="footer__item"><a href="https://github.com/facebook/docusaurus" target="_blank" rel="noopener noreferrer" class="footer__link-item">GitHub<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_Rdzz"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://twitter.com/docusaurus" target="_blank" rel="noopener noreferrer" class="footer__link-item">Twitter<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_Rdzz"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item">
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