Capture function coverage

dynamodb/index.js

@@ -1,4 +1,4 @@
-import { util } from '..';
+import { util } from '../index.js';
 
 // TODO: consistentRead
 // TODO: projection

package.json

@@ -7,7 +7,8 @@
     "scripts": {
         "test:aws": "NODE_OPTIONS=\"--experimental-vm-modules\" TEST_TARGET=AWS_CLOUD jest -u",
         "test": "NODE_OPTIONS=\"--experimental-vm-modules\" jest --ci",
-        "evaluate": "node ./scripts/evaluate.js ./scripts/testcode.js"
+        "evaluate": "node ./scripts/evaluate.js ./scripts/testcode.js",
+        "coverage": "node --experimental-specifier-resolution=node ./scripts/coverage.mjs"
     },
     "repository": {
         "type": "git",

scripts/coverage.mjs

@@ -0,0 +1,64 @@
+import { util } from '../index.js';
+import * as rds from '../rds/index.js';
+import * as dynamodb from '../dynamodb/index.js';
+
+class Namespace {
+  constructor(name, obj) {
+    this.name = name;
+    this.obj = obj;
+  }
+};
+
+const partialImplementations = {
+  'util.appendError': {
+    message: "the function exists but errors are not yet captured",
+  },
+};
+
+// ns must be a Namespace type
+function evaluateNamespace(ns) {
+  for (const [key, value] of Object.entries(ns.obj)) {
+    switch (typeof value) {
+      case 'function': {
+        const qualifiedName = `${ns.name}.${key}`;
+        let message = `* \`${qualifiedName}\``;
+        if (partialImplementations[qualifiedName] !== undefined) {
+          const partialDescription = partialImplementations[qualifiedName].message;
+          message = `${message} _(partial, ${partialDescription})_`;
+        } else {
+        };
+        console.log(message);
+        break;
+      };
+      case "object": {
+        const newNs = new Namespace(`${ns.name}.${key}`, value);
+        evaluateNamespace(newNs);
+        break;
+      };
+      default: {
+        console.error(`Unhandled type ${typeof value}`);
+        break;
+      };
+    }
+  }
+}
+
+function printImportMessage(text) {
+  console.log(`
+Assuming the following import:
+
+\`\`\`javascript
+${text}
+\`\`\`
+    `);
+}
+
+printImportMessage(`import { util } from '@aws-appsync/utils'`);
+evaluateNamespace(new Namespace("util", util));
+
+printImportMessage(`import * as rds from '@aws-appsync/utils/rds'`);
+evaluateNamespace(new Namespace("rds", rds));
+
+printImportMessage(`import * as dynamodb from '@aws-appsync/utils/dynamodb'`);
+evaluateNamespace(new Namespace("dynamodb", dynamodb));
+