| 1 | // fixtures/build-bundles.mjs — run by a person, output committed. |
| 2 | // Docs' script, adopted (oficina/docs/fixtures/build-bundles.mjs). |
| 3 | // The app performs no build step (spec §3.1: "one esbuild bundle |
| 4 | // committed hashed"); this produces the artifact that makes that true: |
| 5 | // a single, minified, content-hashed JS bundle committed to |
| 6 | // internal/slides/static/, embedded into the Go binary by render.go's |
| 7 | // //go:embed and resolved at init by internal/slides/assets_embed.go. |
| 8 | // |
| 9 | // internal/slides/static/, not a top-level static/: Go's //go:embed |
| 10 | // cannot reach outside the directory of the .go file doing the |
| 11 | // embedding, so the bundle lives beside the stylesheets that tree |
| 12 | // already holds. |
| 13 | // |
| 14 | // Paths are resolved from this file's own location, so |
| 15 | // `node build-bundles.mjs` works the same from fixtures/ or anywhere. |
| 16 | // The gate runs it twice and requires a clean tree: the output is a |
| 17 | // pure function of the sources and the pinned toolchain. |
| 18 | import { build } from 'esbuild' |
| 19 | import { createHash } from 'node:crypto' |
| 20 | import { readFileSync, writeFileSync, rmSync, readdirSync, mkdirSync } from 'node:fs' |
| 21 | import { join, dirname } from 'node:path' |
| 22 | import { fileURLToPath } from 'node:url' |
| 23 | |
| 24 | const here = dirname(fileURLToPath(import.meta.url)) |
| 25 | const staticDir = join(here, '..', 'internal', 'slides', 'static') |
| 26 | |
| 27 | mkdirSync(staticDir, { recursive: true }) |
| 28 | |
| 29 | // One bundle. The names here are the names assets_embed.go's |
| 30 | // bundleKinds expects; that file panics at init if one of them has no |
| 31 | // committed file, so a build that silently stopped emitting one cannot |
| 32 | // start. |
| 33 | const bundles = [ |
| 34 | { name: 'editor', entry: 'editor-entry.js' } |
| 35 | ] |
| 36 | |
| 37 | for (const { name, entry } of bundles) { |
| 38 | const outfile = join(staticDir, `${name}.js`) |
| 39 | await build({ |
| 40 | entryPoints: [join(here, entry)], |
| 41 | bundle: true, |
| 42 | format: 'esm', |
| 43 | minify: true, |
| 44 | target: 'es2020', |
| 45 | outfile |
| 46 | }) |
| 47 | |
| 48 | // Content hash in the filename so the asset is immutable-cacheable |
| 49 | // and a stale browser cache cannot serve a bundle that disagrees |
| 50 | // with the server. |
| 51 | const bytes = readFileSync(outfile) |
| 52 | const hash = createHash('sha256').update(bytes).digest('hex').slice(0, 16) |
| 53 | |
| 54 | // Exactly one file per bundle must ever be committed — assets_embed.go |
| 55 | // panics at init if it finds more or less than one — so a rebuild |
| 56 | // removes every previous hashed file for THIS name before writing |
| 57 | // the new one. Anchored to the name so a second bundle, if one ever |
| 58 | // arrives, is never deleted by the first's rebuild. |
| 59 | const stale = new RegExp(`^${name}\\.[0-9a-f]{16}\\.js$`) |
| 60 | for (const f of readdirSync(staticDir)) { |
| 61 | if (stale.test(f)) rmSync(join(staticDir, f)) |
| 62 | } |
| 63 | writeFileSync(join(staticDir, `${name}.${hash}.js`), bytes) |
| 64 | rmSync(outfile) |
| 65 | |
| 66 | console.log(`wrote internal/slides/static/${name}.${hash}.js (${bytes.length} bytes)`) |
| 67 | } |
| 68 | |
amadan