[{"data":1,"prerenderedAt":2387},["ShallowReactive",2],{"page:\u002Fchoosing-the-right-static-site-generator-for-production\u002Fastro-vs-eleventy-for-documentation-sites\u002Ffixing-astro-build-errors-after-upgrading-to-astro-5":3,"all-docs-nav":1236,"filed:\u002Fchoosing-the-right-static-site-generator-for-production\u002Fastro-vs-eleventy-for-documentation-sites\u002Ffixing-astro-build-errors-after-upgrading-to-astro-5":2378},{"id":4,"title":5,"body":6,"breadcrumb":1212,"dateModified":1222,"datePublished":1222,"description":1223,"extension":1224,"faq":1225,"meta":1230,"navigation":429,"path":1231,"seo":1232,"slug":12,"stem":1233,"type":1234,"__hash__":1235},"content\u002Fchoosing-the-right-static-site-generator-for-production\u002Fastro-vs-eleventy-for-documentation-sites\u002Ffixing-astro-build-errors-after-upgrading-to-astro-5\u002Findex.md","Fixing Astro Build Errors After Upgrading to Astro 5",{"type":7,"value":8,"toc":1188},"minimark",[9,13,30,47,52,55,78,81,90,109,250,258,265,272,293,300,306,317,330,338,349,367,383,520,545,654,661,667,672,685,720,730,734,740,748,765,769,772,787,794,798,816,843,852,856,953,960,1052,1056,1096,1100,1109,1113,1118,1121,1125,1128,1132,1135,1139,1142,1146,1184],[10,11,5],"h1",{"id":12},"fixing-astro-build-errors-after-upgrading-to-astro-5",[14,15,16,17,21,22,25,26,29],"p",{},"Astro 5 replaced the content collections API with the content layer, merged ",[18,19,20],"code",{},"hybrid"," output into ",[18,23,24],{},"static",", and tightened a few defaults that Astro 4 sites leaned on. Most sites upgrade with ",[18,27,28],{},"npx @astrojs\u002Fupgrade"," and a handful of edits. A larger site with years of accumulated patterns usually hits several errors in a row, each of which stops the build before the next one appears, which makes the upgrade feel longer than it is.",[14,31,32,33,36,37,40,41,46],{},"This guide works through the errors in the order they appeared on a 1,600-page documentation and blog site built with Astro 4.16, with three content collections, a custom ",[18,34,35],{},"remark"," pipeline, and a few server-rendered routes using ",[18,38,39],{},"output: 'hybrid'",". Each section starts from the error text, gives the cause, and shows the fix. It belongs to ",[42,43,45],"a",{"href":44},"\u002Fchoosing-the-right-static-site-generator-for-production\u002Fastro-vs-eleventy-for-documentation-sites\u002F","Astro vs Eleventy for Documentation Sites",", where Astro's upgrade cadence is part of the long-term cost.",[48,49,51],"h2",{"id":50},"before-you-start","Before You Start",[14,53,54],{},"Build the site on Astro 4 and keep the output so you can prove the upgrade changes nothing a reader can see:",[56,57,62],"pre",{"className":58,"code":59,"language":60,"meta":61,"style":61},"language-sh shiki shiki-themes github-light github-dark","npm run build && cp -r dist \u002Ftmp\u002Fdist-astro4\nfind \u002Ftmp\u002Fdist-astro4 -name '*.html' | sed 's#\u002Ftmp\u002Fdist-astro4##' | sort > \u002Ftmp\u002Furls-astro4.txt\n","sh","",[18,63,64,72],{"__ignoreMap":61},[65,66,69],"span",{"class":67,"line":68},"line",1,[65,70,71],{},"npm run build && cp -r dist \u002Ftmp\u002Fdist-astro4\n",[65,73,75],{"class":67,"line":74},2,[65,76,77],{},"find \u002Ftmp\u002Fdist-astro4 -name '*.html' | sed 's#\u002Ftmp\u002Fdist-astro4##' | sort > \u002Ftmp\u002Furls-astro4.txt\n",[14,79,80],{},"Then run the upgrade tool, which updates Astro and its official integrations together:",[56,82,84],{"className":58,"code":83,"language":60,"meta":61,"style":61},"npx @astrojs\u002Fupgrade\n",[18,85,86],{"__ignoreMap":61},[65,87,88],{"class":67,"line":68},[65,89,83],{},[14,91,92,93,96,97,100,101,104,105,108],{},"On this site it moved ",[18,94,95],{},"astro"," from 4.16.18 to 5.2, and ",[18,98,99],{},"@astrojs\u002Fmdx",", ",[18,102,103],{},"@astrojs\u002Fsitemap"," and ",[18,106,107],{},"@astrojs\u002Fstarlight"," to their matching majors.",[110,111,112,246],"figure",{},[113,114,121,122,121,126,121,130,121,137,121,232],"svg",{"viewBox":115,"role":116,"ariaLabelledBy":117,"xmlns":120},"0 0 760 166","img",[118,119],"a5-errors-title","a5-errors-desc","http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg","\n  ",[123,124,125],"title",{"id":118},"Sequence of build errors during the Astro 4 to Astro 5 upgrade",[127,128,129],"desc",{"id":119},"Five errors in order. First, the output hybrid configuration failed validation. Second, content collections ran in legacy mode and the getEntryBySlug function was missing. Third, entry.slug was undefined in pages. Fourth, the render method on entries was not a function. Fifth, a remark plugin failed because a frontmatter field was now validated by the schema. After the fifth fix the build passed.",[131,132],"rect",{"x":133,"y":133,"width":134,"height":135,"fill":136},"0","760","166","#ffffff",[138,139,141,142,141,149,141,158,141,161,141,166,141,169,141,172,141,179,141,184,141,187,141,190,141,193,141,196,141,202,141,207,141,210,141,213,141,217,141,220,141,223,141,226,141,229,121],"g",{"style":140},"font-family:system-ui, sans-serif;font-size:12px","\n    ",[143,144],"path",{"d":145,"fill":146,"stroke":147,"style":148},"M30.0 99.6 L734.0 99.6","none","#556071","stroke-width:2px;marker-end:url(#a5-errors-arrow)",[150,151],"circle",{"cx":152,"cy":153,"r":154,"fill":155,"stroke":156,"style":157},"60.0","99.6","7","#ff595e","#d83b41","stroke-width:1.5px",[150,159],{"cx":160,"cy":153,"r":154,"fill":155,"stroke":156,"style":157},"220.0",[150,162],{"cx":163,"cy":153,"r":154,"fill":164,"stroke":165,"style":157},"380.0","#ffca3a","#a97b00",[150,167],{"cx":168,"cy":153,"r":154,"fill":164,"stroke":165,"style":157},"540.0",[150,170],{"cx":171,"cy":153,"r":154,"fill":164,"stroke":165,"style":157},"700.0",[173,174,178],"text",{"x":163,"y":175,"fill":176,"style":177},"30.0","#1f2937","font-size:16px;text-anchor:middle;font-weight:700","Errors in the order they appeared",[173,180,183],{"x":152,"y":181,"fill":176,"style":182},"83.6","font-size:12px;text-anchor:middle;font-weight:700","output hybrid",[173,185,186],{"x":160,"y":181,"fill":176,"style":182},"getEntryBySlug",[173,188,189],{"x":163,"y":181,"fill":176,"style":182},"entry.slug undefined",[173,191,192],{"x":168,"y":181,"fill":176,"style":182},"entry.render missing",[173,194,195],{"x":171,"y":181,"fill":176,"style":182},"Schema rejects field",[173,197,201],{"x":152,"y":198,"fill":199,"style":200},"125.6","#b32b30","font-size:11.5px;text-anchor:middle;font-weight:700","1",[173,203,206],{"x":152,"y":204,"fill":147,"style":205},"143.6","font-size:11px;text-anchor:middle","config validation",[173,208,209],{"x":160,"y":198,"fill":199,"style":200},"2",[173,211,212],{"x":160,"y":204,"fill":147,"style":205},"removed API",[173,214,216],{"x":163,"y":198,"fill":215,"style":200},"#8a6d0f","3",[173,218,219],{"x":163,"y":204,"fill":147,"style":205},"use entry.id",[173,221,222],{"x":168,"y":198,"fill":215,"style":200},"4",[173,224,225],{"x":168,"y":204,"fill":147,"style":205},"use render(entry)",[173,227,228],{"x":171,"y":198,"fill":215,"style":200},"5",[173,230,231],{"x":171,"y":204,"fill":147,"style":205},"stricter data",[233,234,141,235,121],"defs",{},[236,237,242,243,141],"marker",{"id":238,"viewBox":239,"refX":240,"refY":228,"markerWidth":154,"markerHeight":154,"orient":241},"a5-errors-arrow","0 0 10 10","8","auto-start-reverse","\n      ",[143,244],{"d":245,"fill":147},"M0 0 L10 5 L0 10 z",[247,248,249],"figcaption",{},"Each error stopped the build, so they surfaced one at a time; the whole sequence took about three hours.",[48,251,253,254,257],{"id":252},"error-1-output-hybrid-is-no-longer-valid","Error 1: ",[18,255,256],{},"output: \"hybrid\""," Is No Longer Valid",[56,259,263],{"className":260,"code":262,"language":173,"meta":61},[261],"language-text","[config] Astro found issue(s) with your configuration:\n! output: Invalid enum value. Expected 'static' | 'server', received 'hybrid'\n",[18,264,262],{"__ignoreMap":61},[14,266,267,271],{},[268,269,270],"strong",{},"Cause."," Astro 5 merged hybrid into static. A static site can still render individual routes on demand.",[14,273,274,277,278,280,281,284,285,288,289,292],{},[268,275,276],{},"Fix."," Change ",[18,279,39],{}," to ",[18,282,283],{},"output: 'static'"," (or remove it, since static is the default). The three routes that were server-rendered already exported ",[18,286,287],{},"export const prerender = false",", which in Astro 5 opts them into on-demand rendering as long as an adapter is configured. The site kept its ",[18,290,291],{},"@astrojs\u002Fcloudflare"," adapter, upgraded to its Astro 5 version.",[48,294,296,297,299],{"id":295},"error-2-getentrybyslug-is-not-exported","Error 2: ",[18,298,186],{}," Is Not Exported",[56,301,304],{"className":302,"code":303,"language":173,"meta":61},[261],"SyntaxError: The requested module 'astro:content' does not provide an export named 'getEntryBySlug'\n",[18,305,303],{"__ignoreMap":61},[14,307,308,310,311,104,313,316],{},[268,309,270],{}," ",[18,312,186],{},[18,314,315],{},"getDataEntryById"," were deprecated in Astro 4 and removed in 5.",[14,318,319,321,322,325,326,329],{},[268,320,276],{}," Replace both with ",[18,323,324],{},"getEntry(collection, id)",". Eleven files used them; a search and replace handled all of them, with ",[18,327,328],{},"slug"," arguments becoming IDs (see the next error for why the values stay the same).",[48,331,333,334,337],{"id":332},"error-3-entryslug-is-undefined","Error 3: ",[18,335,336],{},"entry.slug"," Is Undefined",[14,339,340,341,344,345,348],{},"The build passed this point but generated pages at ",[18,342,343],{},"\u002Fdocs\u002Fundefined\u002F",". The sitemap made it obvious: 1,200 URLs ending in ",[18,346,347],{},"\u002Fundefined\u002F",".",[14,350,351,353,354,357,358,360,361,363,364,348],{},[268,352,270],{}," Collections were still defined the Astro 4 way (",[18,355,356],{},"type: 'content'",", no loader), which Astro 5 runs in legacy mode where ",[18,359,328],{}," exists. Moving them to the content layer, which is what the rest of the upgrade needed, removes ",[18,362,328],{}," in favour of ",[18,365,366],{},"id",[14,368,369,371,372,280,375,378,379,382],{},[268,370,276],{}," Move ",[18,373,374],{},"src\u002Fcontent\u002Fconfig.ts",[18,376,377],{},"src\u002Fcontent.config.ts"," and give each collection a ",[18,380,381],{},"glob"," loader:",[56,384,388],{"className":385,"code":386,"language":387,"meta":61,"style":61},"language-ts shiki shiki-themes github-light github-dark","import { defineCollection, z } from 'astro:content';\nimport { glob } from 'astro\u002Floaders';\n\nconst docs = defineCollection({\n  loader: glob({ pattern: '**\u002F*.{md,mdx}', base: '.\u002Fsrc\u002Fcontent\u002Fdocs' }),\n  schema: z.object({ title: z.string(), description: z.string(), sidebar: z.object({ order: z.number() }).optional() }),\n});\n","ts",[18,389,390,410,424,431,451,474,514],{"__ignoreMap":61},[65,391,392,396,400,403,407],{"class":67,"line":68},[65,393,395],{"class":394},"szBVR","import",[65,397,399],{"class":398},"sVt8B"," { defineCollection, z } ",[65,401,402],{"class":394},"from",[65,404,406],{"class":405},"sZZnC"," 'astro:content'",[65,408,409],{"class":398},";\n",[65,411,412,414,417,419,422],{"class":67,"line":74},[65,413,395],{"class":394},[65,415,416],{"class":398}," { glob } ",[65,418,402],{"class":394},[65,420,421],{"class":405}," 'astro\u002Floaders'",[65,423,409],{"class":398},[65,425,427],{"class":67,"line":426},3,[65,428,430],{"emptyLinePlaceholder":429},true,"\n",[65,432,434,437,441,444,448],{"class":67,"line":433},4,[65,435,436],{"class":394},"const",[65,438,440],{"class":439},"sj4cs"," docs",[65,442,443],{"class":394}," =",[65,445,447],{"class":446},"sScJk"," defineCollection",[65,449,450],{"class":398},"({\n",[65,452,454,457,459,462,465,468,471],{"class":67,"line":453},5,[65,455,456],{"class":398},"  loader: ",[65,458,381],{"class":446},[65,460,461],{"class":398},"({ pattern: ",[65,463,464],{"class":405},"'**\u002F*.{md,mdx}'",[65,466,467],{"class":398},", base: ",[65,469,470],{"class":405},"'.\u002Fsrc\u002Fcontent\u002Fdocs'",[65,472,473],{"class":398}," }),\n",[65,475,477,480,483,486,489,492,494,497,499,502,505,508,511],{"class":67,"line":476},6,[65,478,479],{"class":398},"  schema: z.",[65,481,482],{"class":446},"object",[65,484,485],{"class":398},"({ title: z.",[65,487,488],{"class":446},"string",[65,490,491],{"class":398},"(), description: z.",[65,493,488],{"class":446},[65,495,496],{"class":398},"(), sidebar: z.",[65,498,482],{"class":446},[65,500,501],{"class":398},"({ order: z.",[65,503,504],{"class":446},"number",[65,506,507],{"class":398},"() }).",[65,509,510],{"class":446},"optional",[65,512,513],{"class":398},"() }),\n",[65,515,517],{"class":67,"line":516},7,[65,518,519],{"class":398},"});\n",[14,521,522,523,525,526,529,530,533,534,536,537,540,541,544],{},"Then replace ",[18,524,336],{}," with ",[18,527,528],{},"entry.id"," everywhere (27 occurrences). The glob loader derives IDs from file paths the same way Astro 4 derived slugs — lowercased, without the extension, with ",[18,531,532],{},"index"," collapsed — and respects a ",[18,535,328],{}," field in frontmatter, which 40 pages used for custom URLs. Starlight's own ",[18,538,539],{},"docs"," collection uses ",[18,542,543],{},"docsLoader()",", which handles this for you.",[110,546,547,651],{},[113,548,121,553,121,556,121,559,121,562],{"viewBox":549,"role":116,"ariaLabelledBy":550,"xmlns":120},"0 0 760 245",[551,552],"a5-collections-title","a5-collections-desc",[123,554,555],{"id":551},"How a content collection definition changed between Astro 4 and Astro 5",[127,557,558],{"id":552},"Two panels. In Astro 4 the config lived in src\u002Fcontent\u002Fconfig.ts, collections declared type content, entries had a slug, and pages called entry.render. In Astro 5 the config lives in src\u002Fcontent.config.ts, collections declare a glob loader with a base directory, entries have an id, and pages call render of entry imported from astro content.",[131,560],{"x":133,"y":133,"width":134,"height":561,"fill":136},"245",[138,563,141,564,141,573,141,579,141,582,141,585,141,588,141,594,141,597,141,599,141,601,141,603,141,606,141,612,141,617,141,620,141,623,141,627,141,632,141,637,141,640,141,643,141,645,141,648,121],{"style":140},[131,565],{"x":566,"y":567,"width":568,"height":569,"rx":570,"fill":571,"stroke":572,"style":157},"20.0","58.0","350.0","171.0","10","#f8fafc","#d9e2ef",[150,574],{"cx":575,"cy":576,"r":577,"fill":578,"stroke":578,"style":157},"40.0","103.0","2.5","#1982c4",[150,580],{"cx":575,"cy":581,"r":577,"fill":578,"stroke":578,"style":157},"125.0",[150,583],{"cx":575,"cy":584,"r":577,"fill":578,"stroke":578,"style":157},"146.9",[150,586],{"cx":575,"cy":587,"r":577,"fill":578,"stroke":578,"style":157},"168.9",[131,589],{"x":590,"y":567,"width":568,"height":569,"rx":570,"fill":591,"opacity":592,"stroke":593,"style":157},"390.0","#8ac926","0.2","#5a8a16",[150,595],{"cx":596,"cy":576,"r":577,"fill":591,"stroke":593,"style":157},"410.0",[150,598],{"cx":596,"cy":581,"r":577,"fill":591,"stroke":593,"style":157},[150,600],{"cx":596,"cy":584,"r":577,"fill":591,"stroke":593,"style":157},[150,602],{"cx":596,"cy":587,"r":577,"fill":591,"stroke":593,"style":157},[173,604,605],{"x":163,"y":175,"fill":176,"style":177},"The same collection in Astro 4 and Astro 5",[173,607,611],{"x":608,"y":609,"fill":176,"style":610},"34.0","83.5","font-size:13.5px;text-anchor:start;font-weight:700","Astro 4",[173,613,374],{"x":614,"y":615,"fill":176,"style":616},"50.0","107.0","font-size:11.5px;text-anchor:start",[173,618,356],{"x":614,"y":619,"fill":176,"style":616},"129.0",[173,621,336],{"x":614,"y":622,"fill":176,"style":616},"150.9",[173,624,626],{"x":614,"y":625,"fill":176,"style":616},"172.9","entry.render()",[173,628,631],{"x":608,"y":629,"fill":176,"style":630},"215.0","font-size:12px;text-anchor:start;font-weight:700","legacy mode in Astro 5",[173,633,636],{"x":634,"y":609,"fill":635,"style":610},"404.0","#3f6410","Astro 5",[173,638,377],{"x":639,"y":615,"fill":176,"style":616},"420.0",[173,641,642],{"x":639,"y":619,"fill":176,"style":616},"loader: glob({ base })",[173,644,528],{"x":639,"y":622,"fill":176,"style":616},[173,646,647],{"x":639,"y":625,"fill":176,"style":616},"render(entry)",[173,649,650],{"x":634,"y":629,"fill":176,"style":630},"content layer",[247,652,653],{},"The URL-facing values stay identical: a file's id in Astro 5 equals its slug in Astro 4.",[48,655,657,658],{"id":656},"error-4-entryrender-is-not-a-function","Error 4: ",[18,659,660],{},"entry.render is not a function",[56,662,665],{"className":663,"code":664,"language":173,"meta":61},[261],"TypeError: entry.render is not a function\n",[18,666,664],{"__ignoreMap":61},[14,668,669,671],{},[268,670,270],{}," Content layer entries are plain data objects; rendering moved to a function.",[14,673,674,676,677,680,681,684],{},[268,675,276],{}," Import ",[18,678,679],{},"render"," from ",[18,682,683],{},"astro:content"," and call it with the entry:",[56,686,689],{"className":687,"code":688,"language":95,"meta":61,"style":61},"language-astro shiki shiki-themes github-light github-dark","---\nimport { getEntry, render } from 'astro:content';\nconst entry = await getEntry('docs', Astro.params.slug);\nconst { Content, headings } = await render(entry);\n---\n\u003CContent \u002F>\n",[18,690,691,696,701,706,711,715],{"__ignoreMap":61},[65,692,693],{"class":67,"line":68},[65,694,695],{},"---\n",[65,697,698],{"class":67,"line":74},[65,699,700],{},"import { getEntry, render } from 'astro:content';\n",[65,702,703],{"class":67,"line":426},[65,704,705],{},"const entry = await getEntry('docs', Astro.params.slug);\n",[65,707,708],{"class":67,"line":433},[65,709,710],{},"const { Content, headings } = await render(entry);\n",[65,712,713],{"class":67,"line":453},[65,714,695],{},[65,716,717],{"class":67,"line":476},[65,718,719],{},"\u003CContent \u002F>\n",[14,721,722,723,104,726,729],{},"Fourteen layouts and pages changed. ",[18,724,725],{},"headings",[18,727,728],{},"remarkPluginFrontmatter"," are returned the same way as before.",[48,731,733],{"id":732},"error-5-a-schema-rejects-existing-frontmatter","Error 5: A Schema Rejects Existing Frontmatter",[56,735,738],{"className":736,"code":737,"language":173,"meta":61},[261],"[InvalidContentEntryDataError] blog → 2023\u002Flaunch-week data does not match collection schema.\n  pubDate: Expected date, received string\n",[18,739,737],{"__ignoreMap":61},[14,741,742,744,745,348],{},[268,743,270],{}," Astro 4's legacy collections had coerced some values more loosely. Under the content layer the schema is applied strictly, and nine blog posts had dates written as ",[18,746,747],{},"\"March 3, 2023\"",[14,749,750,752,753,756,757,760,761,764],{},[268,751,276],{}," Use ",[18,754,755],{},"z.coerce.date()"," for date fields, which parses those strings, and fix the two posts whose dates were genuinely ambiguous. A remark plugin that read ",[18,758,759],{},"file.data.astro.frontmatter.draft"," also needed updating, because draft filtering moved into a ",[18,762,763],{},"getCollection"," filter rather than a plugin.",[48,766,768],{"id":767},"verify-the-output","Verify the Output",[14,770,771],{},"With the build passing, compare URLs and content against the Astro 4 output:",[56,773,775],{"className":58,"code":774,"language":60,"meta":61,"style":61},"find dist -name '*.html' | sed 's#^dist##' | sort > \u002Ftmp\u002Furls-astro5.txt\ndiff \u002Ftmp\u002Furls-astro4.txt \u002Ftmp\u002Furls-astro5.txt\n",[18,776,777,782],{"__ignoreMap":61},[65,778,779],{"class":67,"line":68},[65,780,781],{},"find dist -name '*.html' | sed 's#^dist##' | sort > \u002Ftmp\u002Furls-astro5.txt\n",[65,783,784],{"class":67,"line":74},[65,785,786],{},"diff \u002Ftmp\u002Furls-astro4.txt \u002Ftmp\u002Furls-astro5.txt\n",[14,788,789,790,793],{},"The diff was empty: 1,612 HTML files in both builds. An HTML diff after replacing hashed asset filenames with a placeholder showed differences in 41 files, all in the order of attributes on ",[18,791,792],{},"\u003Cimg>"," elements produced by the updated image service — rendering-equivalent, confirmed by visual comparison of five of them.",[48,795,797],{"id":796},"third-party-integrations-and-custom-code","Third-Party Integrations and Custom Code",[14,799,800,801,804,805,808,809,811,812,815],{},"The five errors above came from Astro itself. Two more problems came from code around it. A community sitemap filter integration, last released in 2023, hooked into ",[18,802,803],{},"astro:build:done"," and read ",[18,806,807],{},"routes"," from a shape that changed in Astro 5; it built without error but produced a sitemap missing every page in the blog collection. The official ",[18,810,103],{}," integration with a ",[18,813,814],{},"filter"," option replaced it in ten lines. Checking the sitemap's URL count against the HTML file count is now part of the verification step, because a missing page in a sitemap does not fail any build.",[14,817,818,819,822,823,826,827,830,831,834,835,838,839,842],{},"The other problem was a set of helper functions in ",[18,820,821],{},"src\u002Flib\u002Fcontent.ts"," that wrapped collection queries and returned ",[18,824,825],{},"{ slug, data, body }"," objects to components. The upgrade fixed the obvious call sites, but these helpers kept returning ",[18,828,829],{},"slug: entry.slug",", which was now ",[18,832,833],{},"undefined",", and three components used it to build links. TypeScript would have caught it if the helpers had been typed against ",[18,836,837],{},"CollectionEntry\u003C'docs'>","; they had been typed with a hand-written interface instead. After the upgrade they were retyped with Astro's generated types, so the next breaking change in entry shape will fail type checking (",[18,840,841],{},"astro check",") instead of producing broken links.",[14,844,845,846,848,849,851],{},"The lesson for large sites is to run ",[18,847,841],{}," in CI before the upgrade, so that the type errors the upgrade introduces stand out against a clean baseline. On this site ",[18,850,841],{}," reported 31 errors after the upgrade, and every one of them pointed at code that would have produced a wrong URL or an empty page.",[48,853,855],{"id":854},"measured-impact","Measured Impact",[857,858,859,878],"table",{},[860,861,862],"thead",{},[863,864,865,869,872,875],"tr",{},[866,867,868],"th",{},"Measure",[866,870,871],{},"Astro 4.16",[866,873,874],{},"Astro 5.2",[866,876,877],{},"Tool",[879,880,881,897,913,927,940],"tbody",{},[863,882,883,887,890,892],{},[884,885,886],"td",{},"HTML files",[884,888,889],{},"1,612",[884,891,889],{},[884,893,894],{},[18,895,896],{},"find",[863,898,899,902,905,907],{},[884,900,901],{},"URL changes",[884,903,904],{},"—",[884,906,133],{},[884,908,909,912],{},[18,910,911],{},"diff"," of URL lists",[863,914,915,918,921,924],{},[884,916,917],{},"Cold build",[884,919,920],{},"2 min 48 s",[884,922,923],{},"2 min 21 s",[884,925,926],{},"GitHub Actions",[863,928,929,932,935,938],{},[884,930,931],{},"Warm build (cache restored)",[884,933,934],{},"2 min 40 s",[884,936,937],{},"1 min 12 s",[884,939,926],{},[863,941,942,945,947,950],{},[884,943,944],{},"Time spent on the upgrade",[884,946,904],{},[884,948,949],{},"~3 hours",[884,951,952],{},"Commit timestamps",[14,954,955,956,959],{},"The warm build improvement comes from the content layer's data store, which skips unchanged entries when ",[18,957,958],{},"node_modules\u002F.astro"," is cached between runs.",[110,961,962,1049],{},[113,963,121,968,121,971,121,974,121,977],{"viewBox":964,"role":116,"ariaLabelledBy":965,"xmlns":120},"0 0 760 196",[966,967],"a5-build-title","a5-build-desc",[123,969,970],{"id":966},"Cold and warm build times on Astro 4 and Astro 5",[127,972,973],{"id":967},"Paired bars. Cold build went from 168 seconds on Astro 4 to 141 seconds on Astro 5. Warm build went from 160 seconds to 72 seconds, because the content layer skips unchanged entries when its cache is restored.",[131,975],{"x":133,"y":133,"width":134,"height":976,"fill":136},"196",[138,978,141,979,141,986,141,990,141,996,141,1000,141,1004,141,1008,141,1011,141,1014,141,1018,141,1021,141,1024,141,1030,141,1035,141,1039,141,1044,121],{"style":140},[131,980],{"x":981,"y":614,"width":982,"height":983,"rx":209,"fill":155,"opacity":984,"stroke":156,"style":985},"283.2","14.0","12.0","0.3","stroke-width:1px",[131,987],{"x":988,"y":614,"width":982,"height":983,"rx":209,"fill":591,"opacity":989,"stroke":593,"style":985},"399.0","0.4",[131,991],{"x":992,"y":993,"width":994,"height":995,"rx":216,"fill":155,"opacity":984,"stroke":156,"style":985},"230.0","82.0","460.9","16.0",[131,997],{"x":992,"y":998,"width":999,"height":995,"rx":216,"fill":591,"opacity":989,"stroke":593,"style":985},"102.0","386.8",[131,1001],{"x":992,"y":1002,"width":1003,"height":995,"rx":216,"fill":155,"opacity":984,"stroke":156,"style":985},"134.0","438.9",[131,1005],{"x":992,"y":1006,"width":1007,"height":995,"rx":216,"fill":591,"opacity":989,"stroke":593,"style":985},"154.0","197.5",[143,1009],{"d":1010,"fill":146,"stroke":147,"style":157},"M230.0 78.0 L230.0 176.0",[173,1012,1013],{"x":163,"y":175,"fill":176,"style":177},"Build time before and after the upgrade",[173,1015,871],{"x":1016,"y":152,"fill":147,"style":1017},"303.2","font-size:12px;text-anchor:start",[173,1019,874],{"x":1020,"y":152,"fill":147,"style":1017},"419.0",[173,1022,917],{"x":566,"y":1023,"fill":176,"style":1017},"105.2",[173,1025,1029],{"x":1026,"y":1027,"fill":199,"style":1028},"697.9","94.5","font-size:11.5px;text-anchor:start;font-weight:700","168 s",[173,1031,1034],{"x":1032,"y":1033,"fill":635,"style":1028},"623.8","114.5","141 s",[173,1036,1038],{"x":566,"y":1037,"fill":176,"style":1017},"157.2","Warm build",[173,1040,1043],{"x":1041,"y":1042,"fill":199,"style":1028},"675.9","146.5","160 s",[173,1045,1048],{"x":1046,"y":1047,"fill":635,"style":1028},"434.5","166.5","72 s",[247,1050,1051],{},"Median of five CI runs on a 4-core GitHub Actions runner, same commit apart from the upgrade.",[48,1053,1055],{"id":1054},"pitfalls-rollback","Pitfalls & Rollback",[1057,1058,1059,1069,1078,1084,1090],"ul",{},[1060,1061,1062,1065,1066,1068],"li",{},[268,1063,1064],{},"Leaving collections in legacy mode."," It builds, but loses the content layer's caching and leaves ",[18,1067,328],{}," code that breaks later.",[1060,1070,1071,1077],{},[268,1072,1073,1074,1076],{},"Search and replace of ",[18,1075,328],{}," without checking frontmatter slugs."," Pages with custom slugs keep them only if the loader sees the field.",[1060,1079,1080,1083],{},[268,1081,1082],{},"Skipping the URL diff."," A wrong ID scheme silently changes URLs; the sitemap and the diff catch it.",[1060,1085,1086,1089],{},[268,1087,1088],{},"Upgrading integrations separately."," Use the upgrade tool so majors stay matched.",[1060,1091,1092,1095],{},[268,1093,1094],{},"Rollback:"," the upgrade is one branch; reverting it and restoring the lockfile returns to Astro 4 exactly.",[48,1097,1099],{"id":1098},"conclusion","Conclusion",[14,1101,1102,1103,1105,1106,1108],{},"The Astro 5 upgrade errors arrive one at a time, but they come from four changes: hybrid output merged into static, removed entry helpers, ",[18,1104,328],{}," replaced by ",[18,1107,366],{}," under the content layer, and rendering moved to a function. On a 1,600-page site, fixing them took about three hours, changed no URLs, and halved warm build time.",[48,1110,1112],{"id":1111},"faq","FAQ",[1114,1115,1117],"h3",{"id":1116},"why-does-astro-5-say-my-content-config-is-missing-or-invalid","Why does Astro 5 say my content config is missing or invalid?",[14,1119,1120],{},"Astro 5 expects the content configuration at src\u002Fcontent.config.ts, and collections defined the Astro 4 way, with a type of content or data and no loader, run through a legacy compatibility mode. If the file is still at src\u002Fcontent\u002Fconfig.ts it is found, but mixing the old location with new loader features or with the legacy flag disabled produces errors. Moving the file and adding a glob loader to each collection resolves it.",[1114,1122,1124],{"id":1123},"what-replaced-entryslug-in-astro-5","What replaced entry.slug in Astro 5?",[14,1126,1127],{},"Entries loaded by the glob loader have an id, which is derived from the file path by default in the same way slug was. Code that used entry.slug should use entry.id. If the old slugs came from a slug field in frontmatter, the glob loader respects that field when generating the id, so URLs stay the same.",[1114,1129,1131],{"id":1130},"what-happened-to-output-hybrid-in-astro-5","What happened to output hybrid in Astro 5?",[14,1133,1134],{},"It was merged into static. A static site can now opt individual routes into on-demand rendering by exporting prerender false, as long as an adapter is installed. Configs that set output to hybrid fail validation and should be changed to static, or removed since static is the default.",[1114,1136,1138],{"id":1137},"how-do-i-know-the-upgrade-did-not-change-my-urls","How do I know the upgrade did not change my URLs?",[14,1140,1141],{},"Build with Astro 4 and Astro 5 into separate directories and compare the list of generated files and the sitemap. Any added or missing path is a URL change. Comparing page HTML after normalising hashed asset names catches rendering differences as well.",[48,1143,1145],{"id":1144},"related","Related",[1057,1147,1148,1156,1163,1170,1177],{},[1060,1149,1150,310,1153,1155],{},[268,1151,1152],{},"Parent:",[42,1154,45],{"href":44}," — upgrade cost as a selection factor.",[1060,1157,1158,1162],{},[42,1159,1161],{"href":1160},"\u002Fchoosing-the-right-static-site-generator-for-production\u002Fastro-vs-eleventy-for-documentation-sites\u002Floading-remote-content-with-astro-content-layer-loaders\u002F","Loading Remote Content With Astro Content Layer Loaders"," — what loaders can do beyond glob.",[1060,1164,1165,1169],{},[42,1166,1168],{"href":1167},"\u002Fproduction-ready-deployment-cicd-workflows\u002Fincremental-builds-and-build-caching-for-ssgs\u002Fincremental-builds-in-astro-with-the-content-layer\u002F","Incremental Builds in Astro with the Content Layer"," — the cache behind the warm 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function",{"id":732,"depth":74,"text":733},{"id":767,"depth":74,"text":768},{"id":796,"depth":74,"text":797},{"id":854,"depth":74,"text":855},{"id":1054,"depth":74,"text":1055},{"id":1098,"depth":74,"text":1099},{"id":1111,"depth":74,"text":1112,"children":1206},[1207,1208,1209,1210],{"id":1116,"depth":426,"text":1117},{"id":1123,"depth":426,"text":1124},{"id":1130,"depth":426,"text":1131},{"id":1137,"depth":426,"text":1138},{"id":1144,"depth":74,"text":1145},[1213,1216,1219,1220],{"name":1214,"item":1215},"Home","\u002F",{"name":1217,"item":1218},"Choosing the Right Static Site Generator for Production","\u002Fchoosing-the-right-static-site-generator-for-production\u002F",{"name":45,"item":44},{"name":5,"item":1221},"\u002Fchoosing-the-right-static-site-generator-for-production\u002Fastro-vs-eleventy-for-documentation-sites\u002Ffixing-astro-build-errors-after-upgrading-to-astro-5\u002F","2026-10-02","Work through the build errors an Astro 4 site hits on Astro 5, from legacy 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Astro",{"path":1616,"title":1617},"\u002Fchoosing-the-right-static-site-generator-for-production\u002Ftechnical-seo-for-static-sites\u002Fgenerating-sitemaps-for-large-static-sites","Generating Sitemaps for Large Static Sites",{"path":1619,"title":1620},"\u002Fchoosing-the-right-static-site-generator-for-production\u002Ftechnical-seo-for-static-sites","Technical SEO for Static Sites",{"path":1622,"title":1623},"\u002Fchoosing-the-right-static-site-generator-for-production\u002Ftechnical-seo-for-static-sites\u002Frobots-txt-and-noindex-for-preview-and-staging","robots.txt and noindex for Preview and Staging",{"path":1625,"title":1626},"\u002Fchoosing-the-right-static-site-generator-for-production\u002Ftechnical-seo-for-static-sites\u002Frss-and-atom-feeds-for-static-blogs","RSS and Atom Feeds for Static Blogs",{"path":1628,"title":1629},"\u002Fchoosing-the-right-static-site-generator-for-production\u002Ftechnical-seo-for-static-sites\u002Fseo-safe-pagination-and-tag-pages","SEO-Safe Pagination and Tag Pages",{"path":1631,"title":1632},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fcache-busting-with-content-hashed-filenames","Cache Busting with Content-Hashed Filenames",{"path":1634,"title":1635},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fcache-control-headers-for-static-sites-in-nginx","Cache-Control Headers for Static Sites in Nginx",{"path":1637,"title":1638},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fcache-control-headers-on-s3-and-cloudfront","Cache-Control Headers on S3 and CloudFront",{"path":1640,"title":1641},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fcache-control-headers-on-vercel-for-static-sites","Cache-Control Headers on Vercel for Static Sites",{"path":1643,"title":1644},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fcache-keys-and-query-strings-on-cdns","Cache Keys and Query Strings on CDNs",{"path":1646,"title":1647},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fcaching-404s-and-redirects-at-the-edge","Caching 404s and Redirects at the Edge",{"path":1649,"title":1650},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fcloudflare-vs-cloudfront-cache-hit-ratios-for-static-sites","Cloudflare vs CloudFront Cache Hit Ratios for Static Sites",{"path":1652,"title":1653},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Ffixing-stale-html-after-deploys-on-cloudflare","Fixing Stale HTML After Deploys on Cloudflare",{"path":1655,"title":1656},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs","CDN Caching Rules for SSGs",{"path":1658,"title":1659},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fpurging-the-cdn-cache-after-a-static-deploy","Purging the CDN Cache After a Static Deploy",{"path":1661,"title":1662},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fsetting-cache-control-headers-on-cloudflare-pages","Cache-Control Headers on Cloudflare Pages",{"path":1664,"title":1665},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fsetting-up-proper-cache-headers-on-netlify","Proper Cache Headers on Netlify for SSGs",{"path":1667,"title":1668},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fstale-while-revalidate-for-static-html","Stale-While-Revalidate for Static HTML",{"path":1670,"title":1671},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Ftiered-caching-and-origin-shield","Tiered Caching and Origin Shield",{"path":1673,"title":1674},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fcode-splitting-and-module-preload-in-vite-based-ssgs","Code Splitting and Module Preload in Vite-Based SSGs",{"path":1676,"title":1677},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Ffixing-missing-tailwind-classes-in-production-builds","Fixing Missing Tailwind Classes in Production Builds",{"path":1679,"title":1680},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Ffixing-unused-javascript-warnings-on-static-pages","Fixing Unused JavaScript Warnings on Static Pages",{"path":1682,"title":1683},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization","CSS and JavaScript Asset Optimization",{"path":1685,"title":1686},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Finlining-critical-css-on-static-sites","Inlining Critical CSS on Static Sites",{"path":1688,"title":1689},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fkeeping-tailwind-css-output-small-on-static-sites","Keeping Tailwind CSS Output Small on Static Sites",{"path":1691,"title":1692},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fminifying-html-css-and-js-in-eleventy","Minifying HTML, CSS and JS in Eleventy",{"path":1694,"title":1695},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fprecompressing-assets-with-brotli-and-zstd","Precompressing Assets with Brotli and Zstd",{"path":1697,"title":1698},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fpurging-unused-css-with-tailwind-and-lightningcss","Purging Unused CSS with Tailwind and Lightning CSS",{"path":1700,"title":1701},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fsvg-icon-sprites-vs-inline-icons","SVG Icon Sprites vs Inline Icons",{"path":1703,"title":1704},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Ftailwind-v4-in-astro-without-postcss-plugins","Tailwind v4 in Astro Without PostCSS Plugins",{"path":1706,"title":1707},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Fcls-from-client-side-rendered-components","CLS from Client-Side Rendered Components",{"path":1709,"title":1710},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Fdebugging-cls-with-the-layout-instability-api","Debugging CLS with the Layout Instability API",{"path":1712,"title":1713},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Feliminating-layout-shift-from-web-fonts","Eliminating Layout Shift From Web Fonts",{"path":1715,"title":1716},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Ffixing-cls-from-cookie-banners","Fixing CLS from Cookie Banners",{"path":1718,"title":1719},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Ffixing-cls-from-dynamic-table-of-contents-widgets","Fixing CLS From Dynamic Table of Contents Widgets",{"path":1721,"title":1722},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Ffixing-cls-from-images-without-dimensions-in-markdown","Fixing CLS From Images Without Dimensions in Markdown",{"path":1724,"title":1725},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Ffixing-cls-from-late-loading-embeds","Fixing CLS From Late-Loading Embeds",{"path":1727,"title":1728},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Ffixing-cls-from-sticky-headers-and-anchor-links","Fixing CLS from Sticky Headers and Anchor Links",{"path":1730,"title":1731},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites","Cumulative Layout Shift Fixes for Static Sites",{"path":1733,"title":1734},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Fmeasuring-cls-in-the-field-with-web-vitals-js","Measuring CLS in the Field With web-vitals.js",{"path":1736,"title":1737},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Freserving-space-for-ad-and-promo-slots","Reserving Space for Ad and Promo Slots",{"path":1739,"title":1740},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Freserving-space-for-images-and-embeds-to-stop-layout-shift","Reserving Space for Images and Embeds",{"path":1742,"title":1743},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Fauditing-font-payload-per-page","Auditing Font Payload per Page",{"path":1745,"title":1746},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Ffixing-invisible-text-while-web-fonts-load","Fixing Invisible Text While Web Fonts Load",{"path":1748,"title":1749},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Ffont-display-optional-vs-swap","font-display: optional vs swap",{"path":1751,"title":1752},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites","Font Loading Strategies for Static Sites",{"path":1754,"title":1755},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Fmetric-matched-fallback-fonts-with-size-adjust","Metric-Matched Fallback Fonts with size-adjust",{"path":1757,"title":1758},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Fpreloading-fonts-without-double-downloads","Preloading Fonts Without Double Downloads",{"path":1760,"title":1761},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Fself-hosted-fonts-vs-google-fonts-for-static-sites","Self-Hosted Fonts vs Google Fonts for Static Sites",{"path":1763,"title":1764},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Fself-hosting-google-fonts-to-eliminate-layout-shift","Self-Host Google Fonts to Eliminate Layout Shift",{"path":1766,"title":1767},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Fsubsetting-variable-fonts-for-faster-first-render","Subsetting Variable Fonts for Faster First Render",{"path":1769,"title":1770},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Fusing-system-font-stacks-to-skip-webfonts","Using System Font Stacks to Skip Web Fonts",{"path":1772,"title":1773},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Fvariable-fonts-vs-static-weights","Variable Fonts vs Static Weights",{"path":1775,"title":1776},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Fart-direction-with-the-picture-element","Art Direction with the Picture Element",{"path":1778,"title":1779},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Fblur-up-placeholders-with-lqip","Blur-Up Placeholders with LQIP",{"path":1781,"title":1782},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Fbuilding-an-image-cdn-pipeline-for-static-sites","Building an Image CDN Pipeline for Static Sites",{"path":1784,"title":1785},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Fcaching-processed-images-between-builds","Caching Processed Images Between Builds",{"path":1787,"title":1788},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Ffixing-blurry-images-from-astro-assets-resizing","Fixing Blurry Images From astro:assets 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Plugins",{"path":1802,"title":1803},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Fresponsive-images-with-srcset-in-eleventy","Responsive Images with srcset in Eleventy",{"path":1805,"title":1806},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Fserving-astro-images-through-cloudflare-image-resizing","Serving Astro Images Through Cloudflare Image Resizing",{"path":1808,"title":1809},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Fserving-avif-with-fallbacks-on-static-sites","Serving AVIF With Fallbacks on Static Sites",{"path":1811,"title":1812},"\u002Fperformance-optimization-core-web-vitals-for-ssgs","Core Web Vitals Optimization for SSGs",{"path":1814,"title":1815},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Fastro-islands-vs-full-hydration-performance","Astro Islands vs Full Hydration Performance",{"path":1817,"title":1818},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Fbreaking-up-long-tasks-on-static-sites","Breaking Up Long Tasks on Static Sites",{"path":1820,"title":1821},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Fdeferring-hydration-with-client-visible-in-astro","Deferring Hydration with client:visible in Astro",{"path":1823,"title":1824},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Ffixing-hydration-mismatch-errors-in-astro-islands","Fixing Hydration Mismatch Errors in Astro Islands",{"path":1826,"title":1827},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Ffixing-poor-inp-on-static-pages-with-heavy-widgets","Fixing Poor INP on Static Pages With Heavy Widgets",{"path":1829,"title":1830},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Fhow-to-reduce-bundle-size-in-eleventy-builds","How to Reduce Bundle Size in Eleventy Builds",{"path":1832,"title":1833},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering","JavaScript Hydration & Partial Rendering",{"path":1835,"title":1836},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Fmeasuring-inp-on-static-sites-with-real-user-monitoring","Measuring INP on Static Sites with RUM",{"path":1838,"title":1839},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Fpreact-vs-react-islands-bundle-size","Preact vs React Islands Bundle Size",{"path":1841,"title":1842},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Freplacing-react-islands-with-web-components","Replacing React Islands with Web Components",{"path":1844,"title":1182},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Fserver-islands-in-astro",{"path":1846,"title":1847},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Flargest-contentful-paint-optimization-for-static-sites\u002Feliminating-render-blocking-css-on-static-sites","Eliminating Render-Blocking CSS on Static Sites",{"path":1849,"title":1850},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Flargest-contentful-paint-optimization-for-static-sites\u002Ffixing-lcp-on-text-heavy-documentation-pages","Fixing LCP on Text-Heavy Documentation Pages",{"path":1852,"title":1853},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Flargest-contentful-paint-optimization-for-static-sites\u002Ffixing-lcp-regressions-caused-by-cookie-consent-tools","Fixing LCP Regressions Caused by Cookie Consent Tools",{"path":1855,"title":1856},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Flargest-contentful-paint-optimization-for-static-sites\u002Ffixing-lcp-when-the-hero-is-a-background-image","Fixing LCP When the Hero Is a Background Image",{"path":1858,"title":1859},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Flargest-contentful-paint-optimization-for-static-sites\u002Ffixing-slow-lcp-on-pages-with-embedded-video","Fixing Slow LCP on Pages With Embedded 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