feat: add size property to output

README.md

@@ -201,6 +201,10 @@ properties.
 
   Either `"js"`, `"go"`, or `"rs"`.
 
+- `size`: `number`
+
+  The size of the generated archive, in bytes.
+
 Additionally, the following properties also exist for Node.js functions:
 
 - `bundler`: `string`

src/utils/archive_size.js

@@ -0,0 +1,19 @@
+const { extname } = require('path')
+
+const { stat } = require('./fs')
+
+// Returns the input object with an additional `size` property containing the
+// size of the file at `path` when it is a ZIP archive.
+const addArchiveSize = async (result) => {
+  const { path } = result
+
+  if (extname(path) !== '.zip') {
+    return result
+  }
+
+  const { size } = await stat(path)
+
+  return { ...result, size }
+}
+
+module.exports = { addArchiveSize }

src/utils/format_result.js

@@ -0,0 +1,36 @@
+const { removeFalsy } = require('./remove_falsy')
+
+// Takes the result of zipping a function and formats it for output.
+const formatZipResult = (result) => {
+  const {
+    bundler,
+    bundlerErrors,
+    bundlerWarnings,
+    config = {},
+    inputs,
+    mainFile,
+    name,
+    nativeNodeModules,
+    nodeModulesWithDynamicImports,
+    path,
+    runtime,
+    size,
+  } = result
+
+  return removeFalsy({
+    bundler,
+    bundlerErrors,
+    bundlerWarnings,
+    config,
+    inputs,
+    mainFile,
+    name,
+    nativeNodeModules,
+    nodeModulesWithDynamicImports,
+    path,
+    runtime: runtime.name,
+    size,
+  })
+}
+
+module.exports = { formatZipResult }

src/utils/fs.js

@@ -1,10 +1,11 @@
-const { lstat, readdir, readFile, unlink, writeFile } = require('fs')
+const { lstat, readdir, readFile, stat, unlink, writeFile } = require('fs')
 const { format, join, parse, resolve } = require('path')
 const { promisify } = require('util')
 
 const pLstat = promisify(lstat)
 const pReaddir = promisify(readdir)
 const pReadFile = promisify(readFile)
+const pStat = promisify(stat)
 const pUnlink = promisify(unlink)
 const pWriteFile = promisify(writeFile)
 
@@ -84,5 +85,6 @@ module.exports = {
   listFunctionsDirectory,
   resolveFunctionsDirectories,
   safeUnlink,
+  stat: pStat,
   writeFile: pWriteFile,
 }

src/zip.js

@@ -7,9 +7,10 @@ const { getFlags } = require('./feature_flags')
 const { createManifest } = require('./manifest')
 const { getFunctionsFromPaths } = require('./runtimes')
 const { getPluginsModulesPath } = require('./runtimes/node/utils/plugin_modules_path')
+const { addArchiveSize } = require('./utils/archive_size')
 const { ARCHIVE_FORMAT_NONE, ARCHIVE_FORMAT_ZIP } = require('./utils/consts')
+const { formatZipResult } = require('./utils/format_result')
 const { listFunctionsDirectories, resolveFunctionsDirectories } = require('./utils/fs')
-const { removeFalsy } = require('./utils/remove_falsy')
 
 const DEFAULT_PARALLEL_LIMIT = 5
 
@@ -19,37 +20,6 @@ const validateArchiveFormat = (archiveFormat) => {
   }
 }
 
-// Takes the result of zipping a function and formats it for output.
-const formatZipResult = (result) => {
-  const {
-    bundler,
-    bundlerErrors,
-    bundlerWarnings,
-    config = {},
-    inputs,
-    mainFile,
-    name,
-    nativeNodeModules,
-    nodeModulesWithDynamicImports,
-    path,
-    runtime,
-  } = result
-
-  return removeFalsy({
-    bundler,
-    bundlerErrors,
-    bundlerWarnings,
-    config,
-    inputs,
-    mainFile,
-    name,
-    nativeNodeModules,
-    nodeModulesWithDynamicImports,
-    path,
-    runtime: runtime.name,
-  })
-}
-
 // Zip `srcFolder/*` (Node.js or Go files) to `destFolder/*.zip` so it can be
 // used by AWS Lambda
 const zipFunctions = async function (
@@ -105,7 +75,13 @@ const zipFunctions = async function (
       concurrency: parallelLimit,
     },
   )
-  const formattedResults = results.filter(Boolean).map(formatZipResult)
+  const formattedResults = await Promise.all(
+    results.filter(Boolean).map(async (result) => {
+      const resultWithSize = await addArchiveSize(result)
+
+      return formatZipResult(resultWithSize)
+    }),
+  )
 
   if (manifest !== undefined) {
     await createManifest({ functions: formattedResults, path: resolve(manifest) })
@@ -136,7 +112,7 @@ const zipFunction = async function (
     return
   }
 
-  const { config, extension, filename, mainFile, name, runtime, srcDir, stat } = functions.values().next().value
+  const { config, extension, filename, mainFile, name, runtime, srcDir, stat: stats } = functions.values().next().value
   const pluginsModulesPath =
     defaultModulesPath === undefined ? await getPluginsModulesPath(srcPath) : defaultModulesPath
 
@@ -156,7 +132,7 @@ const zipFunction = async function (
     runtime,
     srcDir,
     srcPath,
-    stat,
+    stat: stats,
   })
 
   return formatZipResult({ ...zipResult, mainFile, name, runtime })

tests/main.js

@@ -2186,3 +2186,17 @@ testMany(
     t.true(mock)
   },
 )
+
+testMany(
+  'Returns a `size` property with the size of each generated archive',
+  ['bundler_default', 'bundler_esbuild', 'bundler_nft'],
+  async (options, t) => {
+    const FUNCTIONS_COUNT = 6
+    const { files } = await zipNode(t, 'many-functions', {
+      length: FUNCTIONS_COUNT,
+      opts: options,
+    })
+
+    files.every(({ size }) => Number.isInteger(size) && size > 0)
+  },
+)