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node_modules/loader-utils/lib/hash/BatchedHash.js

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+const MAX_SHORT_STRING = require('./wasm-hash').MAX_SHORT_STRING;
+
+class BatchedHash {
+  constructor(hash) {
+    this.string = undefined;
+    this.encoding = undefined;
+    this.hash = hash;
+  }
+
+  /**
+   * Update hash {@link https://nodejs.org/api/crypto.html#crypto_hash_update_data_inputencoding}
+   * @param {string|Buffer} data data
+   * @param {string=} inputEncoding data encoding
+   * @returns {this} updated hash
+   */
+  update(data, inputEncoding) {
+    if (this.string !== undefined) {
+      if (
+        typeof data === 'string' &&
+        inputEncoding === this.encoding &&
+        this.string.length + data.length < MAX_SHORT_STRING
+      ) {
+        this.string += data;
+
+        return this;
+      }
+
+      this.hash.update(this.string, this.encoding);
+      this.string = undefined;
+    }
+
+    if (typeof data === 'string') {
+      if (
+        data.length < MAX_SHORT_STRING &&
+        // base64 encoding is not valid since it may contain padding chars
+        (!inputEncoding || !inputEncoding.startsWith('ba'))
+      ) {
+        this.string = data;
+        this.encoding = inputEncoding;
+      } else {
+        this.hash.update(data, inputEncoding);
+      }
+    } else {
+      this.hash.update(data);
+    }
+
+    return this;
+  }
+
+  /**
+   * Calculates the digest {@link https://nodejs.org/api/crypto.html#crypto_hash_digest_encoding}
+   * @param {string=} encoding encoding of the return value
+   * @returns {string|Buffer} digest
+   */
+  digest(encoding) {
+    if (this.string !== undefined) {
+      this.hash.update(this.string, this.encoding);
+    }
+
+    return this.hash.digest(encoding);
+  }
+}
+
+module.exports = BatchedHash;