Pre-release: Eleventy v3.0.0-alpha.15

• BREAKING: Bump js-yaml dependency from v3 to v4 #2126
  • Full js-yaml@v4 release notes: https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md#400---2021-01-03
• New node front matter has been renamed to js and javascript (keeping backwards compatibility with previous JavaScript object literal front matter type) #2819 (node is still there, but it should be considered deprecated)
• Support for pnpm #2876
• Add support for 11ty.js in Virtual Templates: #3347
• Add support for Virtual Templates to be used as Eleventy Layouts #1612 #2307
• Memoize internal slug, slugify, and inputPathToUrl filters #840
• Improved error messaging for filters/shortcodes #3286
• Adds new eleventyConfig.getFilters eleventyConfig.getShortcodes, and eleventyConfig.getPairedShortcodes methods for plugins and custom template languages to access universal filters/shortcodes #3310
• New eleventyConfig.augmentFunctionContext config API to help with this.eleventy and this.page on shortcodes/filters in plugins #3355
• Adds eleventyConfig.addDateParsing configuration API to customize date parsing #867
• Fix regression with JavaScript dependencies cache-busting in 11ty.js Layout files #3338
• Fix regression with markdown engine simple aliases (without additional options) still using preprocessing engine #3339
• PR: replace index.d.ts with jsdoc @typedef by @mayank99 in #3349
• PR: refactor: Use ?. for terser conditionals by @Zearin in #3343

Full Changelog: v3.0.0-alpha.14...v3.0.0-alpha.15
Full Eleventy v3 Milestone: https://github.com/11ty/eleventy/milestone/40

🥳🥳🥳 5 issues left (122 solved) on the Eleventy 3.0.0 milestone!

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