Feature created metadata

[sameerpashaaa]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes Last updated: feeding data through front matter, new "created" metadata #5691) and the maintainers have approved on my working plan.

Motivation

This PR implements the created front matter field for the @docusaurus/plugin-content-docs package, as proposed in issue #5691.

Currently, Docusaurus supports last_update front matter to let authors override the last-updated date of a document. However, there is no equivalent way to specify a document's creation date through front matter. This is useful for:

• Sites migrated from another platform where original creation dates must be preserved.
• Displaying "Published on" dates on doc pages.
• Sorting or filtering docs by creation date in custom theme code.

This PR adds a created front matter field that is validated, parsed into a millisecond timestamp (createdAt), and exposed on the DocMetadataBase type — following the exact same pattern as last_update / lastUpdatedAt.

Test Plan

Unit tests were added to frontMatter.test.ts covering:

• Valid date strings (ISO 8601, plain date, locale string formats).
• Invalid values (gibberish, numbers, empty strings) → expect a validation warning/rejection.
• undefined when the field is absent.

Integration tests were added to docs.test.ts covering:

• A fixture doc (customCreated.md) with created: 2024-01-15 correctly produces createdAt: new Date('2024-01-15').getTime().
• A doc without created in its front matter produces createdAt: undefined.
• ISO datetime strings and locale date strings are parsed correctly via new Date(value).getTime().

To run the tests locally:

# Build packages first (required for internal deps)
YARN_IGNORE_ENGINES=true yarn build:packages

# Run the relevant test suites
yarn test packages/docusaurus-plugin-content-docs/src/__tests__/frontMatter.test.ts
yarn test packages/docusaurus-plugin-content-docs/src/__tests__/docs.test.ts

All 105 tests pass.

Test links

Deploy preview: https://deploy-preview-_____--docusaurus-2.netlify.app/

Changes

Layer	File(s)	What changed
Validation	packages/docusaurus-utils-validation/src/validationSchemas.ts	Added FrontMatterCreatedSchema using Joi.date().raw()
Validation	packages/docusaurus-utils-validation/src/index.ts	Exported FrontMatterCreatedSchema
Front matter	packages/docusaurus-plugin-content-docs/src/frontMatter.ts	Applied schema to DocFrontMatterSchema
Processing	packages/docusaurus-plugin-content-docs/src/docs.ts	Extracted created field, parsed to createdAt ms timestamp
Types	packages/docusaurus-plugin-content-docs/src/plugin-content-docs.d.ts	Added created?: Date | string to DocFrontMatter; added createdAt?: number | null to DocMetadataBase
Docs	website/docs/api/plugins/plugin-content-docs.mdx	Added created to the front matter reference table and example
Tests	src/__tests__/frontMatter.test.ts, docs.test.ts, fixture customCreated.md, snapshots	New unit + integration tests

Related issues/PRs

• Closes Last updated: feeding data through front matter, new "created" metadata #5691 — Last updated: feeding data through front matter, new "created" metadata

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