feat: support region configuration option

packages/zip-it-and-ship-it/src/manifest.ts

@@ -18,6 +18,7 @@ interface ManifestFunction {
   name: string
   path: string
   priority?: number
+  region?: string
   routes?: ExtendedRoute[]
   runtime: string
   runtimeVersion?: string
@@ -62,6 +63,7 @@ const formatFunctionForManifest = ({
   path,
   priority,
   trafficRules,
+  region,
   routes,
   runtime,
   runtimeVersion,
@@ -79,6 +81,7 @@ const formatFunctionForManifest = ({
     mainFile,
     name,
     priority,
+    region,
     trafficRules,
     runtimeVersion,
     path: resolve(path),

packages/zip-it-and-ship-it/src/runtimes/node/in_source_config/index.ts

@@ -17,6 +17,7 @@ import { getImports } from '../parser/imports.js'
 import { safelyParseSource, safelyReadSource } from '../parser/index.js'
 import type { ModuleFormat } from '../utils/module_format.js'
 
+import { REGIONS } from './properties/region.js'
 import { parse as parseSchedule } from './properties/schedule.js'
 
 export const IN_SOURCE_CONFIG_MODULE = '@netlify/functions'
@@ -26,6 +27,7 @@ export interface StaticAnalysisResult {
   excludedRoutes?: Route[]
   inputModuleFormat?: ModuleFormat
   invocationMode?: InvocationMode
+  region?: string
   routes?: ExtendedRoute[]
   runtimeAPIVersion?: number
 }
@@ -37,6 +39,11 @@ interface FindISCDeclarationsOptions {
 const httpMethod = z.enum(['GET', 'POST', 'PUT', 'PATCH', 'OPTIONS', 'DELETE', 'HEAD'])
 const httpMethods = z.preprocess((input) => (typeof input === 'string' ? input.toUpperCase() : input), httpMethod)
 const path = z.string().startsWith('/', { message: "Must start with a '/'" })
+const region = z.enum(REGIONS, {
+  errorMap: () => ({
+    message: `Must be one of the supported regions (${REGIONS.join(', ')})`,
+  }),
+})
 
 export type HttpMethod = z.infer<typeof httpMethod>
 export type HttpMethods = z.infer<typeof httpMethods>
@@ -70,6 +77,7 @@ export const inSourceConfig = functionConfig
       .optional(),
     preferStatic: z.boolean().optional().catch(undefined),
     rateLimit: rateLimit.optional().catch(undefined),
+    region: region.optional(),
   })
 
 export type InSourceConfig = z.infer<typeof inSourceConfig>
@@ -149,6 +157,10 @@ export const parseSource = (source: string, { functionName }: FindISCDeclaration
         methods: data.method ?? [],
         prefer_static: data.preferStatic || undefined,
       }))
+
+      if (data.region) {
+        result.region = data.region
+      }
     } else {
       // TODO: Handle multiple errors.
       const [issue] = error.issues

packages/zip-it-and-ship-it/src/runtimes/node/in_source_config/properties/region.ts

@@ -0,0 +1,17 @@
+export const REGIONS = [
+  'ap-northeast-1',
+  'ap-southeast-1',
+  'ap-southeast-2',
+  'ca-central-1',
+  'eu-central-1',
+  'eu-north-1',
+  'eu-south-1',
+  'eu-west-1',
+  'eu-west-2',
+  'eu-west-3',
+  'sa-east-1',
+  'us-east-1',
+  'us-east-2',
+  'us-west-1',
+  'us-west-2',
+] as const

packages/zip-it-and-ship-it/src/utils/format_result.ts

@@ -8,6 +8,7 @@ export type FunctionResult = Omit<FunctionArchive, 'runtime'> & {
   bootstrapVersion?: string
   routes?: ExtendedRoute[]
   excludedRoutes?: Route[]
+  region?: string
   runtime: RuntimeName
   schedule?: string
   runtimeAPIVersion?: number
@@ -20,6 +21,7 @@ export const formatZipResult = (archive: FunctionArchive) => {
     staticAnalysisResult: undefined,
     routes: archive.staticAnalysisResult?.routes,
     excludedRoutes: archive.staticAnalysisResult?.excludedRoutes,
+    region: archive.staticAnalysisResult?.region,
     runtime: archive.runtime.name,
     schedule: archive.staticAnalysisResult?.config?.schedule ?? archive?.config?.schedule,
     runtimeAPIVersion: archive.staticAnalysisResult?.runtimeAPIVersion,

packages/zip-it-and-ship-it/tests/fixtures-esm/v2-region/function.js

@@ -0,0 +1,10 @@
+export default async () =>
+  new Response('<h1>Hello world</h1>', {
+    headers: {
+      'content-type': 'text/html',
+    },
+  })
+
+export const config = {
+  region: 'eu-west-1',
+}

packages/zip-it-and-ship-it/tests/fixtures-esm/v2-region/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}

packages/zip-it-and-ship-it/tests/unit/runtimes/node/in_source_config.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect, test } from 'vitest'
 
 import { parseSource } from '../../../../src/runtimes/node/in_source_config/index.js'
+import { REGIONS } from '../../../../src/runtimes/node/in_source_config/properties/region.js'
 import { getLogger } from '../../../../src/utils/logger.js'
 
 describe('`schedule` helper', () => {
@@ -838,4 +839,60 @@ describe('V2 API', () => {
       runtimeAPIVersion: 2,
     })
   })
+
+  describe('`region` property', () => {
+    test('With no region', () => {
+      const source = `
+      export default async () => new Response("Hello!")
+      export const config = {}`
+
+      const isc = parseSource(source, options)
+      expect(isc).toEqual({
+        config: {},
+        excludedRoutes: [],
+        inputModuleFormat: 'esm',
+        routes: [],
+        runtimeAPIVersion: 2,
+      })
+    })
+
+    test('With a supported region', () => {
+      const source = `
+      export default async () => new Response("Hello!")
+      export const config = { region: 'eu-west-1' }`
+
+      const isc = parseSource(source, options)
+      expect(isc).toEqual({
+        config: { region: 'eu-west-1' },
+        excludedRoutes: [],
+        inputModuleFormat: 'esm',
+        region: 'eu-west-1',
+        routes: [],
+        runtimeAPIVersion: 2,
+      })
+    })
+
+    test('With an unsupported region', () => {
+      expect.assertions(4)
+
+      const source = `
+      export default async () => new Response("Hello!")
+      export const config = { region: 'mars-west-1' }`
+
+      try {
+        parseSource(source, options)
+      } catch (error) {
+        const { customErrorInfo, message } = error
+
+        expect(message).toBe(
+          `Function func1 has a configuration error on 'region': Must be one of the supported regions (${REGIONS.join(
+            ', ',
+          )})`,
+        )
+        expect(customErrorInfo.type).toBe('functionsBundling')
+        expect(customErrorInfo.location.functionName).toBe('func1')
+        expect(customErrorInfo.location.runtime).toBe('js')
+      }
+    })
+  })
 })

packages/zip-it-and-ship-it/tests/v2api.test.ts

@@ -784,4 +784,35 @@ describe.runIf(semver.gte(nodeVersion, '18.13.0'))('V2 functions API', () => {
     expect(manifest.functions[0].name).toBe('function')
     expect(manifest.functions[0].buildData).toEqual({ bootstrapVersion, runtimeAPIVersion: 2 })
   })
+
+  test('Adds the selected region to the manifest file', async () => {
+    const bootstrapPath = getBootstrapPath()
+    const bootstrapPackageJson = await readFile(resolve(bootstrapPath, '..', '..', 'package.json'), 'utf8')
+    const { version: bootstrapVersion } = JSON.parse(bootstrapPackageJson)
+
+    const { path: tmpDir } = await getTmpDir({ prefix: 'zip-it-test' })
+    const manifestPath = join(tmpDir, 'manifest.json')
+
+    const { files } = await zipFixture('v2-region', {
+      fixtureDir: FIXTURES_ESM_DIR,
+      opts: {
+        featureFlags: {
+          zisi_add_metadata_file: true,
+        },
+        manifest: manifestPath,
+      },
+    })
+
+    expect(files.length).toBe(1)
+    expect(files[0].name).toBe('function')
+    expect(files[0].bootstrapVersion).toBe(bootstrapVersion)
+    expect(files[0].runtimeAPIVersion).toBe(2)
+
+    const manifestString = await readFile(manifestPath, { encoding: 'utf8' })
+    const manifest = JSON.parse(manifestString)
+
+    expect(manifest.functions.length).toBe(1)
+    expect(manifest.functions[0].name).toBe('function')
+    expect(manifest.functions[0].buildData).toEqual({ bootstrapVersion, runtimeAPIVersion: 2 })
+  })
 })