refactor(javascript): group domain semantics and contracts (#907)

src/domain/javascript/javascriptExportShapeComparisonIdentity.ts

@@ -0,0 +1,17 @@
+import { createHash } from "node:crypto";
+
+import canonicalize from "canonicalize";
+
+/** Canonically encode one export-shape comparison value. */
+export const canonicalExportShapeValue = (value: unknown): string => {
+  const encoded = canonicalize(value);
+  if (encoded === undefined)
+    throw new TypeError(
+      "JavaScript export shape comparison could not canonicalize data",
+    );
+  return encoded;
+};
+
+/** Derive one deterministic SHA-256 comparison identifier component. */
+export const digestExportShapeValue = (value: unknown): string =>
+  createHash("sha256").update(canonicalExportShapeValue(value)).digest("hex");