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index.js
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index.js
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/* eslint-env node */
import fs from 'node:fs';
import path from 'node:path';
import crypto from 'node:crypto';
import {createRequire} from 'node:module';
import {pathToFileURL} from 'node:url';
import findCacheDir from 'find-cache-dir';
import {bundleWasm} from './lib/bundle-wasm.js';
import {collectWasmImports} from './lib/collect-wasm-imports.js';
import wrapWasmCode from './lib/wrap-wasm-code.js';
export {watPlugin as default};
let wabt;
let cacheDir = findCacheDir({name: 'eslint-plugin-wat', create: true});
let wasmFilter = /\.(wat|wasm)$/;
let isFileImport = /^(\/|\.\/|\.\.\/)/;
// TODO: integrate wrap-wasm
function watPlugin({
inlineFunctions = false,
bundle = false, // bundle wasm files together based on custom import syntax
wrap = false, // import functions directly with import statement
treeshakeWasmImports = wrap, // strip away unused wasm when using wrap
ignoreCache = false,
loader = 'binary',
wasmFeatures = {},
} = {}) {
wasmFeatures = {
...defaultWasmFeatures,
...wasmFeatures,
};
// don't cache when bundling, otherwise we're stale on updates to deep imported files
ignoreCache = ignoreCache || bundle;
const wasmBytes = {};
return {
name: 'esbuild-plugin-wat',
async setup(build) {
let wasmImports =
treeshakeWasmImports &&
(await collectWasmImports(build.initialOptions.entryPoints));
build.onResolve(
{filter: wasmFilter},
async ({path: wasmPath, namespace, resolveDir, importer}) => {
if (namespace === 'wasm-stub') {
return {
path: wasmPath,
namespace: 'wasm-binary',
};
}
// if (!resolveDir) return; // ignore unresolvable paths
// wasmPath = path.isAbsolute(wasmPath)
// ? wasmPath
// : path.resolve(resolveDir, wasmPath);
let require = createRequire(pathToFileURL(importer));
wasmPath = require.resolve(wasmPath);
let isWat = wasmPath.endsWith('.wat');
let originalBytes = await fs.promises.readFile(wasmPath);
let {
bytes,
meta: {watchFiles, exportNames, otherImports},
} = await fromCache(
wasmPath,
originalBytes,
async bytes => {
let watchFiles, exportNames, otherImports;
if (bundle) {
let imports = treeshakeWasmImports
? wasmImports[wasmPath]
: undefined;
let bundleResult = await bundleWasm({
path: wasmPath,
wrap,
imports,
});
bytes = bundleResult.wasm;
watchFiles = bundleResult.watchFiles;
exportNames = bundleResult.exportNames;
otherImports = bundleResult.imports;
} else if (isWat) {
wabt = wabt ?? (await (await import('wabt')).default());
let wabtModule = wabt.parseWat('', bytes, wasmFeatures);
bytes = new Uint8Array(wabtModule.toBinary({}).buffer);
}
if (inlineFunctions) {
bytes = transformInlineFunctions(bytes);
}
return {bytes, meta: {watchFiles, exportNames, otherImports}};
},
ignoreCache
);
wasmBytes[wasmPath] = bytes;
let jsImports = {};
if (wrap && exportNames) {
for (let importPath in otherImports) {
if (importPath === 'js') continue;
// if (!isFileImport.test(importPath)) continue;
// let resolvedPath = path.isAbsolute(importPath)
// ? importPath
// : path.resolve(resolveDir, importPath);
jsImports[importPath] = otherImports[importPath];
delete otherImports[importPath];
}
}
return {
path: wasmPath,
namespace: 'wasm-stub',
watchFiles: watchFiles ?? [wasmPath],
pluginData: {exportNames, otherImports, jsImports, resolveDir},
};
}
);
// Virtual modules in the "wasm-stub" namespace are filled with
// the JavaScript code for compiling the WebAssembly binary. The
// binary itself is imported from a second virtual module.
build.onLoad(
{filter: /.*/, namespace: 'wasm-stub'},
async ({
path: wasmPath,
pluginData: {
exportNames,
otherImports: imports,
jsImports,
resolveDir,
},
}) => {
let contents;
if (wrap && exportNames) {
let exportString = exportNames.join(', ');
let jsImportStrings = '';
let importString = '{ ';
for (let importPath in jsImports) {
let importListString = jsImports[importPath].join(', ');
let importObjString =
'{' +
jsImports[importPath].map(s => `'${s}': ${s}`).join(', ') +
'},';
jsImportStrings += `\nimport {${importListString}} from '${importPath}';`;
importString += `'${importPath}': ${importObjString}`;
}
for (let importPath in imports) {
let importListString =
'{' +
imports[importPath].map(s => `'${s}': '${s}'`).join(', ') +
'},';
importString += `'${importPath}': ${importListString}`;
}
importString += ' }';
contents = `import wasm from ${JSON.stringify(wasmPath)};
import {wrap} from '__wrap-wasm';${jsImportStrings}
let {${exportString}} = wrap(wasm, ${JSON.stringify(
exportNames
)}, ${importString});
export {${exportString}};\n`;
} else {
contents = `import wasm from ${JSON.stringify(wasmPath)};
let exportNames = ${JSON.stringify(exportNames)};
let imports = ${JSON.stringify(imports)};
export {wasm as default, exportNames, imports};\n`;
}
return {
contents,
loader: 'js',
resolveDir,
};
}
);
build.onLoad(
{filter: /.*/, namespace: 'wasm-binary'},
async ({path: wasmPath}) => {
return {
contents: wasmBytes[wasmPath],
loader,
};
}
);
build.onResolve({filter: /__wrap-wasm$/}, ({path}) => {
return {path, namespace: 'wrap-wasm'};
});
build.onLoad({filter: /.*/, namespace: 'wrap-wasm'}, () => {
return {contents: wrapWasmCode, loader: 'js'};
});
},
};
}
const defaultWasmFeatures = {
exceptions: true,
mutable_globals: true,
sat_float_to_int: true,
sign_extension: true,
simd: true,
threads: true,
multi_value: true,
tail_call: true,
bulk_memory: true,
reference_types: true,
annotations: true,
gc: true,
};
let binaryen;
async function transformInlineFunctions(wasmBytes) {
if (binaryen === undefined) {
// this import takes forever which is why we make it optional
binaryen = (await import('binaryen')).default;
}
let module = binaryen.readBinary(wasmBytes);
binaryen.setOptimizeLevel(3);
binaryen.setShrinkLevel(0);
binaryen.setFlexibleInlineMaxSize(1000000000);
module.runPasses(['inlining-optimizing']);
// module.optimize();
return module.emitBinary();
}
function hash(stuff) {
return crypto.createHash('sha1').update(stuff).digest('base64url');
}
// memoize bytes-to-bytes transform
async function fromCache(key, content, transform, ignoreCache) {
let keyHash = hash(key);
let contentHash = hash(content);
let bytes, meta;
try {
bytes = await fs.promises.readFile(
path.resolve(cacheDir, `${keyHash}.${contentHash}.wasm`)
);
meta = JSON.parse(
await fs.promises.readFile(
path.resolve(cacheDir, `${keyHash}.${contentHash}.json`),
{encoding: 'utf8'}
)
);
} catch {}
if (bytes === undefined || meta === undefined || ignoreCache) {
let result = await transform(content);
bytes = result.bytes;
meta = result.meta;
// clean old cached files, then write new one
fs.promises
.readdir(cacheDir)
.then(files =>
Promise.all(
files
.filter(f => f.startsWith(keyHash))
.map(f => fs.promises.unlink(path.resolve(cacheDir, f)))
)
)
.then(() => {
fs.promises.writeFile(
path.resolve(cacheDir, `${keyHash}.${contentHash}.wasm`),
bytes
);
fs.promises.writeFile(
path.resolve(cacheDir, `${keyHash}.${contentHash}.json`),
JSON.stringify(meta),
{encoding: 'utf8'}
);
});
}
return {bytes, meta};
}