fix: add importMapURL to manifest validation

.eslintrc.cjs

@@ -23,6 +23,7 @@ module.exports = {
       files: ['node/**/*.test.ts', 'vitest.config.ts'],
       rules: {
         'max-lines-per-function': 'off',
+        'max-nested-callbacks': 'off',
         'max-statements': 'off',
         'no-magic-numbers': 'off',
       },

node/validation/manifest/__snapshots__/index.test.ts.snap

@@ -53,6 +53,21 @@ REQUIRED must have required property 'format'
   6 |   ],"
 `;
 
+exports[`import map URL > should throw on wrong type 1`] = `
+"Validation of Edge Functions manifest failed
+TYPE must be string
+
+  28 |   ],
+  29 |   \\"bundler_version\\": \\"1.6.0\\",
+> 30 |   \\"importMapURL\\": [
+     |                   ^
+> 31 |     \\"file:///root/.netlify/edge-functions-dist/import_map.json\\"
+     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+> 32 |   ]
+     | ^^^^ 👈🏽  type must be string
+  33 | }"
+`;
+
 exports[`layers > should throw on additional property 1`] = `
 "Validation of Edge Functions manifest failed
 ADDTIONAL PROPERTY must NOT have additional properties

node/validation/manifest/index.test.ts

@@ -1,4 +1,3 @@
-/* eslint-disable max-nested-callbacks */
 import { test, expect, describe } from 'vitest'
 
 import { validateManifest, ManifestValidationError } from './index.js'
@@ -89,6 +88,7 @@ describe('bundle', () => {
     expect(() => validateManifest(manifest)).toThrowErrorMatchingSnapshot()
   })
 })
+
 describe('route', () => {
   test('should throw on additional property', () => {
     const manifest = getBaseManifest()
@@ -143,4 +143,19 @@ describe('layers', () => {
     expect(() => validateManifest(manifest)).toThrowErrorMatchingSnapshot()
   })
 })
-/* eslint-enable max-nested-callbacks */
+
+describe('import map URL', () => {
+  test('should accept string value', () => {
+    const manifest = getBaseManifest()
+    manifest.importMapURL = 'file:///root/.netlify/edge-functions-dist/import_map.json'
+
+    expect(() => validateManifest(manifest)).not.toThrowError()
+  })
+
+  test('should throw on wrong type', () => {
+    const manifest = getBaseManifest()
+    manifest.importMapURL = ['file:///root/.netlify/edge-functions-dist/import_map.json']
+
+    expect(() => validateManifest(manifest)).toThrowErrorMatchingSnapshot()
+  })
+})

node/validation/manifest/schema.ts

@@ -55,6 +55,7 @@ const edgeManifestSchema = {
       type: 'array',
       items: layersSchema,
     },
+    importMapURL: { type: 'string' },
     bundler_version: { type: 'string' },
   },
   additionalProperties: false,