AMP Runtime Version


Use it to query cdn.ampproject.org for the current release or canary version of the AMP Runtime. Uses a stale-while-revalidate caching strategy to avoid network requests in the critical path.

You can use the API to re-write AMP runtime URLs to their versioned counter parts to improve browser caching, e.g. to replace:

``
https://cdn.ampproject.org/v0.css
`

with:

`
https://cdn.ampproject.org/rtv/001515617716922/v0.css
`

Installation

Install via:

`sh
npm install @ampproject/toolbox-runtime-version
`

Usage

Basic usage:

`js
const runtimeVersion = require('@ampproject/toolbox-runtime-version');

// Release version
runtimeVersion.currentVersion().then(version => {
console.log(version);
});

// Canary version
runtimeVersion.currentVersion({canary: true}).then(version => {
console.log(version);
});

// Rewriting cache URLs
const ampRuntimeUrl = 'https://cdn.ampproject.org/v0.js';
const version = await runtimeVersion.currentVersion();
const versionedAmpRuntimeUrl = ampRuntimeUrl.replace(
'https://cdn.ampproject.org/',
'https://cdn.ampproject.org/rtv/' + version + '/'
);
console.log(versionedAmpRuntimeUrl);
``