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Improve MDX rendering performance (#8533)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| --- | ||
| '@astrojs/mdx': patch | ||
| --- | ||
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| Improve MDX rendering performance by sharing processor instance |
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65 changes: 65 additions & 0 deletions
65
packages/integrations/mdx/src/recma-inject-import-meta-env.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| import type { Literal, MemberExpression } from 'estree'; | ||
| import { visit as estreeVisit } from 'estree-util-visit'; | ||
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| export function recmaInjectImportMetaEnv({ | ||
| importMetaEnv, | ||
| }: { | ||
| importMetaEnv: Record<string, any>; | ||
| }) { | ||
| return (tree: any) => { | ||
| estreeVisit(tree, (node) => { | ||
| if (node.type === 'MemberExpression') { | ||
| // attempt to get "import.meta.env" variable name | ||
| const envVarName = getImportMetaEnvVariableName(node); | ||
| if (typeof envVarName === 'string') { | ||
| // clear object keys to replace with envVarLiteral | ||
| for (const key in node) { | ||
| delete (node as any)[key]; | ||
| } | ||
| const envVarLiteral: Literal = { | ||
| type: 'Literal', | ||
| value: importMetaEnv[envVarName], | ||
| raw: JSON.stringify(importMetaEnv[envVarName]), | ||
| }; | ||
| Object.assign(node, envVarLiteral); | ||
| } | ||
| } | ||
| }); | ||
| }; | ||
| } | ||
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| /** | ||
| * Check if estree entry is "import.meta.env.VARIABLE" | ||
| * If it is, return the variable name (i.e. "VARIABLE") | ||
| */ | ||
| function getImportMetaEnvVariableName(node: MemberExpression): string | Error { | ||
| try { | ||
| // check for ".[ANYTHING]" | ||
| if (node.object.type !== 'MemberExpression' || node.property.type !== 'Identifier') | ||
| return new Error(); | ||
|
|
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| const nestedExpression = node.object; | ||
| // check for ".env" | ||
| if (nestedExpression.property.type !== 'Identifier' || nestedExpression.property.name !== 'env') | ||
| return new Error(); | ||
|
|
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| const envExpression = nestedExpression.object; | ||
| // check for ".meta" | ||
| if ( | ||
| envExpression.type !== 'MetaProperty' || | ||
| envExpression.property.type !== 'Identifier' || | ||
| envExpression.property.name !== 'meta' | ||
| ) | ||
| return new Error(); | ||
|
|
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| // check for "import" | ||
| if (envExpression.meta.name !== 'import') return new Error(); | ||
|
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| return node.property.name; | ||
| } catch (e) { | ||
| if (e instanceof Error) { | ||
| return e; | ||
| } | ||
| return new Error('Unknown parsing error'); | ||
| } | ||
| } |
49 changes: 49 additions & 0 deletions
49
packages/integrations/mdx/src/rehype-apply-frontmatter-export.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| import { InvalidAstroDataError } from '@astrojs/markdown-remark'; | ||
| import { safelyGetAstroData } from '@astrojs/markdown-remark/dist/internal.js'; | ||
| import type { VFile } from 'vfile'; | ||
| import { jsToTreeNode } from './utils.js'; | ||
|
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| export function rehypeApplyFrontmatterExport() { | ||
| return function (tree: any, vfile: VFile) { | ||
| const astroData = safelyGetAstroData(vfile.data); | ||
| if (astroData instanceof InvalidAstroDataError) | ||
| throw new Error( | ||
| // Copied from Astro core `errors-data` | ||
| // TODO: find way to import error data from core | ||
| '[MDX] A remark or rehype plugin attempted to inject invalid frontmatter. Ensure "astro.frontmatter" is set to a valid JSON object that is not `null` or `undefined`.' | ||
| ); | ||
| const { frontmatter } = astroData; | ||
| const exportNodes = [ | ||
| jsToTreeNode(`export const frontmatter = ${JSON.stringify(frontmatter)};`), | ||
| ]; | ||
| if (frontmatter.layout) { | ||
| // NOTE(bholmesdev) 08-22-2022 | ||
| // Using an async layout import (i.e. `const Layout = (await import...)`) | ||
| // Preserves the dev server import cache when globbing a large set of MDX files | ||
| // Full explanation: 'https://github.com/withastro/astro/pull/4428' | ||
| exportNodes.unshift( | ||
| jsToTreeNode( | ||
| /** @see 'vite-plugin-markdown' for layout props reference */ | ||
| `import { jsx as layoutJsx } from 'astro/jsx-runtime'; | ||
| export default async function ({ children }) { | ||
| const Layout = (await import(${JSON.stringify(frontmatter.layout)})).default; | ||
| const { layout, ...content } = frontmatter; | ||
| content.file = file; | ||
| content.url = url; | ||
| return layoutJsx(Layout, { | ||
| file, | ||
| url, | ||
| content, | ||
| frontmatter: content, | ||
| headings: getHeadings(), | ||
| 'server:root': true, | ||
| children, | ||
| }); | ||
| };` | ||
| ) | ||
| ); | ||
| } | ||
| tree.children = exportNodes.concat(tree.children); | ||
| }; | ||
| } |
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