101 lines
3.9 KiB
JavaScript
Executable file
101 lines
3.9 KiB
JavaScript
Executable file
#!/usr/bin/env node
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// Forward to the automatically-generated WebAssembly loader from the Go compiler
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const module_ = require('module');
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const path = require('path');
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const fs = require('fs');
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const wasm_exec_node = path.join(__dirname, '..', 'wasm_exec_node.js');
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const esbuild_wasm = path.join(__dirname, '..', 'esbuild.wasm');
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const code = fs.readFileSync(wasm_exec_node, 'utf8');
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const wrapper = new Function('require', 'WebAssembly', code);
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function instantiate(bytes, importObject) {
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// Using this API causes "./esbuild --version" to run around 1 second faster
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// than using the "WebAssembly.instantiate()" API when run in node (v12.16.2)
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const module = new WebAssembly.Module(bytes);
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const instance = new WebAssembly.Instance(module, importObject);
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return Promise.resolve({ instance, module });
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}
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// Node has another bug where using "fs.read" to read from stdin reads
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// everything successfully and then throws an error, but only on Windows. Go's
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// WebAssembly support uses "fs.read" so it hits this problem. This is a patch
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// to try to work around the bug in node. This bug has been reported to node
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// at least twice in https://github.com/nodejs/node/issues/35997 and in
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// https://github.com/nodejs/node/issues/19831. This issue has also been
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// reported to the Go project: https://github.com/golang/go/issues/43913.
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const read = fs.read;
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fs.read = function () {
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const callback = arguments[5];
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arguments[5] = function (err, count) {
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if (count === 0 && err && err.code === 'EOF') {
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arguments[0] = null;
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}
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return callback.apply(this, arguments);
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};
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return read.apply(this, arguments);
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};
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// Hack around a Unicode bug in node: https://github.com/nodejs/node/issues/24550.
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// See this for the matching Go issue: https://github.com/golang/go/issues/43917.
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const write = fs.write;
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fs.write = function (fd, buf, offset, length, position, callback) {
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if (offset === 0 && length === buf.length && position === null) {
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if (fd === process.stdout.fd) {
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try {
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process.stdout.write(buf, err => err ? callback(err, 0, null) : callback(null, length, buf));
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} catch (err) {
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callback(err, 0, null);
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}
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return;
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}
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if (fd === process.stderr.fd) {
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try {
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process.stderr.write(buf, err => err ? callback(err, 0, null) : callback(null, length, buf));
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} catch (err) {
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callback(err, 0, null);
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}
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return;
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}
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}
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return write.apply(this, arguments);
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};
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const writeSync = fs.writeSync;
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fs.writeSync = function (fd, buf) {
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if (fd === process.stdout.fd) return process.stdout.write(buf), buf.length;
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if (fd === process.stderr.fd) return process.stderr.write(buf), buf.length;
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return writeSync.apply(this, arguments);
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};
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// WASM code generated with Go 1.17.2+ will crash when run in a situation with
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// many environment variables: https://github.com/golang/go/issues/49011. An
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// example of this situation is running a Go-compiled WASM executable in GitHub
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// Actions. Work around this by filtering node's copy of environment variables
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// down to only include the environment variables that esbuild currently uses.
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const esbuildUsedEnvVars = [
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'NO_COLOR',
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'NODE_PATH',
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'npm_config_user_agent',
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'WT_SESSION',
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]
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for (let key in process.env) {
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if (esbuildUsedEnvVars.indexOf(key) < 0) {
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delete process.env[key]
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}
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}
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// Node v19 introduced "globalThis.crypto" https://github.com/nodejs/node/pull/44897.
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// This broke Go's WebAssembly shim: https://github.com/golang/go/issues/56860.
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// Hack around this breakage by resetting "globalThis.crypto" to "writable".
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// Just to be safe, also make it "configurable" in case Go updates their
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// compiler such that it tries to reconfigure "globalThis.crypto" itself.
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Object.defineProperty(globalThis, 'crypto', {
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writable: true,
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configurable: true,
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});
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process.argv.splice(2, 0, esbuild_wasm);
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wrapper(module_.createRequire(wasm_exec_node), Object.assign(Object.create(WebAssembly), { instantiate }));
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