wehub-resource-sync
68 lines
3.0 KiB
TypeScript
Executable File
68 lines
3.0 KiB
TypeScript
Executable File
#!/usr/bin/env bun
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// Embeds mupdf's `mupdf-wasm.wasm` into the compiled single-file binary.
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//
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// mupdf loads its wasm by reading the `mupdf-wasm.wasm` sibling of its own
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// module via `new URL(..., import.meta.url)` + `readFileSync`. A `bun --compile`
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// binary has no node_modules, so that read fails (`ENOENT .../mupdf-wasm.wasm`),
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// and marking mupdf `--external` instead makes `bun --compile` eagerly fail to
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// resolve the package at startup (the static `import * as mupdf` lives in a lazy
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// chunk but is hoisted). So the binary build bundles mupdf and embeds the wasm
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// bytes here, handing them to the WASM module as `$libmupdf_wasm_Module.wasmBinary`
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// (see src/utils/markit.ts).
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//
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// `--generate` copies the wasm next to src/utils/mupdf-wasm-embed.ts and rewrites
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// that module to import it via `with { type: "file" }`; `--reset` restores the
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// checked-in placeholder and removes the copy. The npm `dist/cli.js` bundle never
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// runs this — it keeps mupdf external and loads the wasm from node_modules.
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import * as fs from "node:fs/promises";
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import { createRequire } from "node:module";
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import * as path from "node:path";
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const utilsDir = path.join(import.meta.dir, "..", "src", "utils");
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const helperPath = path.join(utilsDir, "mupdf-wasm-embed.ts");
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const wasmCopyPath = path.join(utilsDir, "mupdf-wasm.wasm");
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const placeholder = `// AUTOGENERATED -- managed by scripts/embed-mupdf-wasm.ts. Do not edit by hand.
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//
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// Compiled single-file binaries cannot let mupdf resolve its \`mupdf-wasm.wasm\`
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// sibling from the read-only bunfs, so the binary build (scripts/build-binary.ts
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// and scripts/ci-release-build-binaries.ts) regenerates this module to embed the
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// wasm bytes via \`with { type: "file" }\` and copies the wasm next to it. Source
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// checkouts, \`bun test\`, and the npm \`dist/cli.js\` bundle keep mupdf external and
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// load the wasm from node_modules, so this placeholder returns undefined and the
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// build resets back to it afterward.
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export function loadEmbeddedMupdfWasm(): Uint8Array | undefined {
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\treturn undefined;
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}
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`;
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const generated = `// AUTOGENERATED -- managed by scripts/embed-mupdf-wasm.ts. Do not edit or commit.
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import { readFileSync } from "node:fs";
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import wasmPath from "./mupdf-wasm.wasm" with { type: "file" };
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export function loadEmbeddedMupdfWasm(): Uint8Array | undefined {
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\treturn readFileSync(wasmPath);
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}
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`;
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if (process.argv.includes("--reset")) {
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await Bun.write(helperPath, placeholder);
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try {
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await fs.unlink(wasmCopyPath);
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} catch (err) {
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if ((err as NodeJS.ErrnoException).code !== "ENOENT") throw err;
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}
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process.exit(0);
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}
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const wasmSource = path.join(path.dirname(createRequire(import.meta.url).resolve("mupdf")), "mupdf-wasm.wasm");
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const wasmFile = Bun.file(wasmSource);
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if (!(await wasmFile.exists())) {
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throw new Error(`mupdf wasm not found at ${wasmSource}; run \`bun install\` first.`);
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}
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await Bun.write(wasmCopyPath, wasmFile);
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await Bun.write(helperPath, generated);
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console.log(`Embedded mupdf wasm (${wasmFile.size} bytes) into ${path.relative(process.cwd(), wasmCopyPath)}`);
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