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node_modules/hasha/thread.js

@@ -0,0 +1,57 @@
+'use strict';
+const fs = require('fs');
+const crypto = require('crypto');
+const {parentPort} = require('worker_threads');
+
+const handlers = {
+	hashFile: (algorithm, filePath) => new Promise((resolve, reject) => {
+		const hasher = crypto.createHash(algorithm);
+		fs.createReadStream(filePath)
+			// TODO: Use `Stream.pipeline` when targeting Node.js 12.
+			.on('error', reject)
+			.pipe(hasher)
+			.on('error', reject)
+			.on('finish', () => {
+				const {buffer} = hasher.read();
+				resolve({value: buffer, transferList: [buffer]});
+			});
+	}),
+	hash: async (algorithm, input) => {
+		const hasher = crypto.createHash(algorithm);
+
+		if (Array.isArray(input)) {
+			for (const part of input) {
+				hasher.update(part);
+			}
+		} else {
+			hasher.update(input);
+		}
+
+		const hash = hasher.digest().buffer;
+		return {value: hash, transferList: [hash]};
+	}
+};
+
+parentPort.on('message', async message => {
+	try {
+		const {method, args} = message;
+		const handler = handlers[method];
+
+		if (handler === undefined) {
+			throw new Error(`Unknown method '${method}'`);
+		}
+
+		const {value, transferList} = await handler(...args);
+		parentPort.postMessage({id: message.id, value}, transferList);
+	} catch (error) {
+		const newError = {message: error.message, stack: error.stack};
+
+		for (const [key, value] of Object.entries(error)) {
+			if (typeof value !== 'object') {
+				newError[key] = value;
+			}
+		}
+
+		parentPort.postMessage({id: message.id, error: newError});
+	}
+});