Prerender Config for Static Site Generation (SSG)
As of 1.13.0
, the optional prerender config can be used while prerendering a
www
output target. The
prerender.config.ts
file can further update the parsed document of each page, before it is serialized to HTML.
Within stencil.config.ts
, set the path to the prerendering config file path using the
prerenderConfig
property, such as:
import { Config } from '@stencil/core';
export const config: Config = {
outputTargets: [
{
type: 'www',
baseUrl: 'https://stenciljs.com/',
prerenderConfig: './prerender.config.ts',
}
]
};
Next, inside of the prerender.config.ts
file, it should export a
config
object using the
PrerenderConfig
interface.
import { PrerenderConfig } from '@stencil/core';
export const config: PrerenderConfig = {
...
};
Config | Description | Default |
---|---|---|
afterHydrate(document, url) |
Run after each document is hydrated, but before it is serialized into an HTML string. Hook is passed the
document and its
URL . |
|
beforeHydrate(document, url) |
Run before each document is hydrated. Hook is passed the
document it's
URL . |
|
afterSerializeTemplate(html) |
Runs after the template Document object has serialize into an HTML formatted string. Returns an HTML string to be used as the base template for all prerendered pages. | |
beforeSerializeTemplate(document) |
Runs before the template Document object is serialize into an HTML formatted string. Returns the Document to be serialized which will become the base template html for all prerendered pages. | |
canonicalUrl(url) |
A hook to be used to generate the canonical <link> tag which goes in the
<head> of every prerendered page. Returning
null will not add a canonical url tag to the page. |
|
crawlUrls |
While prerendering, crawl same-origin URLs found within <a href> elements. | true |
entryUrls |
URLs to start the prerendering from. By default the root URL of
/ is used. |
['/'] |
filterAnchor(attrs, base) |
Return true the given
<a> element should be crawled or not. |
|
filterUrl(url, base) |
Return true if the given URL should be prerendered or not. |
|
filePath(url, filePath) |
Returns the file path which the prerendered HTML content should be written to. | |
hydrateOptions(url) |
Returns the hydrate options to use for each individual prerendered page. | |
loadTemplate(filePath) |
Returns the template file's content. The template is the base HTML used for all prerendered pages. | |
normalizeUrl(href, base) |
Used to normalize the page's URL from a given a string and the current page's base URL. Largely used when reading an anchor's
href attribute value and normalizing it into a
URL . |
|
staticSite |
Static Site Generated (SSG). Does not include Stencil's clientside JavaScript, custom elements or preload modules. | false |
trailingSlash |
If the prerenndered URLs should have a trailing "/"" or not | false |
Individual Page Hydrate Options
Beyond settings for the entire prerendering process with
prerender.config.ts
, you can also
set individual hydrate options per each page. The
hydrateOptions(url)
hook can be used to further configure each page. Below is an example of the prerender config with the
hydrateOptions()
hook, which returns options for each page.
import { PrerenderConfig } from '@stencil/core';
export const config: PrerenderConfig = {
hydrateOptions(url) {
return {
prettyHtml: true
};
}
};
Option | Description | Default |
---|---|---|
addModulePreloads |
Adds <link rel="modulepreload"> for modules that will eventually be requested. |
true |
approximateLineWidth |
Sets an approximate line width the HTML should attempt to stay within. Note that this is "approximate", in that HTML may often not be able to be split at an exact line width. Additionally, new lines created is where HTML naturally already has whitespace, such as before an attribute or spaces between words. | 100 |
canonicalUrl |
Sets the href attribute on the
<link rel="canonical"> tag within the
<head> . If the value is not defined it will ensure a canonical link tag is no included in the
<head> . |
|
clientHydrateAnnotations |
Include the HTML comments and attributes used by the clientside JavaScript to read the structure of the HTML and rebuild each component. | true |
constrainTimeouts |
Constrain setTimeout() to 1ms, but still async. Also only allows
setInterval() to fire once, also constrained to 1ms. |
true |
cookie |
Sets document.cookie . |
|
direction |
Sets the dir attribute on the top level
<html> . |
|
excludeComponents |
Component tag names listed here will not be prerendered, nor will hydrated on the clientside. Components listed here will be ignored as custom elements and treated no differently than a
<div> . | |
inlineExternalStyleSheets |
External stylesheets from <link rel="stylesheet"> are instead inlined into
<style> elements. |
true |
language |
Sets the lang attribute on the top level
<html> . |
|
maxHydrateCount |
Maximum number of components to hydrate on one page. | 300 |
minifyScriptElements |
Minify JavaScript content within <script> elements. |
true |
minifyStyleElements |
Minify CSS content within <style> elements. |
true |
prettyHtml |
Format the HTML in a nicely indented format. | false |
referrer |
Sets document.referrer . |
|
removeAttributeQuotes |
Remove quotes from attribute values when possible. | true |
removeBooleanAttributeQuotes |
Remove the ="" from standardized
boolean attributes, such as
hidden or checked . | true |
removeEmptyAttributes |
Remove these standardized attributes when their value is empty:
class ,
dir , id ,
lang , and name ,
title . |
true |
removeHtmlComments |
Remove HTML comments. | true |
removeScripts |
Removes every <script> element found in the
document . |
false |
removeUnusedStyles |
Removes CSS not used by elements within the document . |
true |
resourcesUrl |
The url the runtime uses for the resources, such as the assets directory. | |
runtimeLogging |
Prints out runtime console logs to the NodeJS process. | false |
staticComponents |
Component tags listed here will only be prerendered or serverside-rendered and will not be clientside hydrated. This is useful for components that are not dynamic and do not need to be defined as a custom element within the browser. For example, a header or footer component would be a good example that may not require any clientside JavaScript. | |
staticDocument |
Entire document should be static. This is useful for specific pages that should be static, rather than the entire site. If the whole site should be static, use the
staticSite property on the prerender config instead. If only certain components should be static then use
staticComponents instead. |
false |
timeout |
The amount of milliseconds to wait for a page to finish rendering until a timeout error is thrown. | 15000 |
title |
Sets document.title . |
|
url | Sets location.href . |
|
userAgent |
Sets navigator.userAgent . |
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