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esbuild-wasm: don't create a new exit0 native module for each run #719

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Jan 30, 2021
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esbuild-wasm: don't create a new exit0 native module for each run #719

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19 changes: 14 additions & 5 deletions npm/esbuild-wasm/bin/esbuild
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@

// Forward to the automatically-generated WebAssembly loader from the Go compiler

const crypto = require('crypto');
const path = require('path');
const zlib = require('zlib');
const fs = require('fs');
Expand Down Expand Up @@ -41,12 +42,20 @@ process.on('exit', code => {
// Otherwise if the exit code is zero, try to fall back to a binary N-API module that
// calls the operating system's "exit(0)" function.
const nativeModule = `${process.platform}-${os.arch()}-${os.endianness()}.node`;
const data = require('../exit0')[nativeModule];
if (data) {
const base64 = require('../exit0')[nativeModule];
if (base64) {
try {
const tempFile = path.join(os.tmpdir(), `${Math.random().toString(36).slice(2)}-${nativeModule}`);
fs.writeFileSync(tempFile, zlib.inflateRawSync(Buffer.from(data, 'base64')));
require(tempFile);
const data = zlib.inflateRawSync(Buffer.from(base64, 'base64'));
const hash = crypto.createHash('sha256').update(base64).digest().toString('hex').slice(0, 16);
const tempFile = path.join(os.tmpdir(), `${hash}-${nativeModule}`);
try {
if (fs.readFileSync(tempFile).equals(data)) {
require(tempFile);
}
} finally {
fs.writeFileSync(tempFile, data);
require(tempFile);
}
} catch (e) {
}
}
Expand Down