Milestone 0: import zappier billing, Verae middleware, and Zapier research

Compose-ready workspace: packages/zappier (rate card, portal, Stripe),
packages/verae-zapier-middleware (timestamp + NATS), packages/verae-zapier
(CLI app), vendor/zapier-platform, and research/zapier vendor corpus.

Gate 0 structure checks pass. Product code and research are not yet wired.

vendor/zapier-platform/packages/schema/lib/functional-constraints/requiredSamples.js

@@ -0,0 +1,56 @@
+'use strict';
+
+const _ = require('lodash');
+const jsonschema = require('jsonschema');
+
+// todo: deal with circular dep.
+const RESOURCE_ID = '/ResourceSchema';
+const RESOURCE_METHODS = ['get', 'hook', 'list', 'search', 'create'];
+
+const check = (definition) => {
+  if (!definition.operation || _.get(definition, 'display.hidden')) {
+    return null;
+  }
+
+  const samples = _.get(definition, 'operation.sample', {});
+  return !_.isEmpty(samples)
+    ? null
+    : new jsonschema.ValidationError(
+        'requires "sample", because it\'s not hidden',
+        definition,
+        definition.id,
+      );
+};
+
+module.exports = (definition, mainSchema) => {
+  let definitions = [];
+
+  if (mainSchema.id === RESOURCE_ID) {
+    definitions = RESOURCE_METHODS.map((method) => definition[method]).filter(
+      Boolean,
+    );
+
+    // allow method definitions to inherit the sample
+    if (definition.sample) {
+      definitions.forEach((methodDefinition) => {
+        if (methodDefinition.operation && !methodDefinition.operation.sample) {
+          methodDefinition.operation.sample = definition.sample;
+        }
+      });
+    }
+
+    if (!definitions.length) {
+      return [
+        new jsonschema.ValidationError(
+          'expected at least one resource operation',
+          definition,
+          definition.id,
+        ),
+      ];
+    }
+  } else {
+    definitions = [definition];
+  }
+
+  return definitions.map(check).filter(Boolean);
+};