mergeMeta()function

mergeMeta(meta1: Meta, meta2: PossibleMeta, caller: AnyCaller = mergeMeta): Meta

Param	Type
`meta1`	`Meta`	The existing fully-resolved `Meta` to merge into. required
`.root`	`ImmutableURL`	Base URL for the app (used to resolve `url` and set as `<base>` tag in `<Head>`). readonly
`.url`	`ImmutableURL`	URL of the current page (used to update history API and as the initial URL for routing). readonly
`.app`	`string`	Title of the entire application. readonly
`.title`	`string`	Title of the current page (set as `<title>` in `<Head>` readonly
`.description`	`string`	Description of the current page. readonly
`.image`	`string`	readonly
`.language`	`string`	Language code (used for `lang` tag in HTML). readonly
`.csp`	`MetaCSP`	Type for a meta Content-Security-Policy tag in { resource: string[] } format. readonly
`.tags`	`MetaTags`	Set of named meta <meta /> tags in { name: content } format. readonly
`.links`	`MetaLinks`	Set of resolved meta <link /> tags in { rel: href } format (hrefs already absolutified to ImmutableURI). readonly
`.modules`	`MetaAssets`	Set of resolved linked assets in (href)[] format (hrefs already absolutified to ImmutableURI). readonly
`.scripts`	`MetaAssets`	Set of resolved linked assets in (href)[] format (hrefs already absolutified to ImmutableURI). readonly
`.stylesheets`	`MetaAssets`	Set of resolved linked assets in (href)[] format (hrefs already absolutified to ImmutableURI). readonly
`meta2`	`PossibleMeta`	The new `PossibleMeta` to apply on top. required
`.root`	`PossibleURL`	Base URL for the app — accepts a string or `URL`, resolved with `requireURL()`. readonly
`.url`	`PossibleURI`	New URL for the page. - Resolved using `requireURL()` if set relative to `root` readonly
`.params`	`PossibleURIParams`	Set the params in the URL (not merged with existing params). - Added to `url` after it is resolved. - Baseically readonly
`.links`	`PossibleMetaLinks`	Set of input meta <link /> tags in { rel: href } format, before hrefs are resolved. readonly
`.modules`	`PossibleMetaAssets`	Set of input linked assets in (href)[] format, before hrefs are resolved. readonly
`.scripts`	`PossibleMetaAssets`	Set of input linked assets in (href)[] format, before hrefs are resolved. readonly
`.stylesheets`	`PossibleMetaAssets`	Set of input linked assets in (href)[] format, before hrefs are resolved. readonly
`caller`	`AnyCaller`	Function to attribute thrown URL-resolution errors to (defaults to `mergeMeta`). Defaults to `mergeMeta`

Return
`Meta`	A new fully-resolved `Meta` combining both inputs.

Merge a PossibleMeta onto an existing Meta, resolving URLs and assets in the process.

title is merged with joinTitles().
url is resolved to an absolute URL, e.g. ./d/e/f + /a/b/c becomes https://d.com/a/b/c/d/e/f
stylesheets and links hrefs newly set in meta2 are absolutified against the merged url/root, so they stay correct no matter where they are later rendered.

Examples

mergeMeta(currentMeta, { title: "Messages", url: "./messages" })