diff --git a/modules/integration-browser/src/build_decrypt_fixtures.ts b/modules/integration-browser/src/build_decrypt_fixtures.ts
index cec58f457..f419ecee7 100644
--- a/modules/integration-browser/src/build_decrypt_fixtures.ts
+++ b/modules/integration-browser/src/build_decrypt_fixtures.ts
@@ -27,7 +27,7 @@ import { DecryptManifestList } from './types' // eslint-disable-line no-unused-v
  * 1. The code is not tied to a specific copy of the manifest information
  * 2. The tests can be run on a subset of tests for debugging.
  */
-export async function buildDecryptFixtures (fixtures: string, vectorFile: string, testName: string, slice: string) {
+export async function buildDecryptFixtures (fixtures: string, vectorFile: string, testName?: string, slice?: string) {
   const [start = 0, end = 9999] = (slice || '').split(':').map(n => parseInt(n, 10))
 
   const centralDirectory = await Open.file(vectorFile)
diff --git a/modules/integration-browser/src/build_encrypt_fixtures.ts b/modules/integration-browser/src/build_encrypt_fixtures.ts
index a7e4863ff..b091fcd1e 100644
--- a/modules/integration-browser/src/build_encrypt_fixtures.ts
+++ b/modules/integration-browser/src/build_encrypt_fixtures.ts
@@ -34,7 +34,7 @@ import got from 'got'
  * 1. The code is not tied to a specific copy of the manifest information
  * 2. The tests can be run on a subset of tests for debugging.
  */
-export async function buildEncryptFixtures (fixtures: string, manifestFile: string, keyFile: string, testName: string, slice: string) {
+export async function buildEncryptFixtures (fixtures: string, manifestFile: string, keyFile: string, testName?: string, slice?: string) {
   const [start = 0, end = 9999] = (slice || '').split(':').map(n => parseInt(n, 10))
   const { tests, plaintexts }: EncryptManifestList = await getParsedJSON(manifestFile)
   const { keys }: KeyList = await getParsedJSON(keyFile)
diff --git a/modules/integration-browser/src/cli.ts b/modules/integration-browser/src/cli.ts
index aace54ad9..c589c7806 100644
--- a/modules/integration-browser/src/cli.ts
+++ b/modules/integration-browser/src/cli.ts
@@ -73,22 +73,22 @@ if (!existsSync(fixtures)) {
 }
 
 ;(async (argv) => {
-  const { _: [ command ], testName, slice, karma, decryptOracle = '' } = argv
+  const { _: [ command ], testName, slice, karma } = argv
 
   writeFileSync(`${fixtures}/decrypt_tests.json`, JSON.stringify([]))
   writeFileSync(`${fixtures}/encrypt_tests.json`, JSON.stringify([]))
-  writeFileSync(`${fixtures}/decrypt_oracle.json`, JSON.stringify(decryptOracle))
 
   if (command === 'decrypt') {
-    const { vectorFile } = argv
-    const vectorPath = join(__dirname, vectorFile as string)
-    if (!existsSync(vectorPath)) throw new Error(`No file found at ${vectorPath}`)
-    // @ts-ignore
-    await buildDecryptFixtures(fixtures, vectorFile, testName, slice)
+    // It is not clear how to get yargs/typescript to play nicely with sub commands
+    const { vectorFile } = argv as unknown as { vectorFile: string}
+    if (!existsSync(vectorFile)) throw new Error(`No file found at ${vectorFile}`)
+    await buildDecryptFixtures(fixtures, vectorFile as string, testName, slice)
   } else if (command === 'encrypt') {
-    const { manifestFile, keyFile } = argv
-    // @ts-ignore
-    await buildEncryptFixtures(fixtures, manifestFile, keyFile, testName, slice)
+    // It is not clear how to get yargs/typescript to play nicely with sub commands
+    const { manifestFile, keyFile, decryptOracle } = argv as unknown as { manifestFile: string, keyFile: string, decryptOracle: string}
+    writeFileSync(`${fixtures}/decrypt_oracle.json`, JSON.stringify(decryptOracle))
+
+    await buildEncryptFixtures(fixtures, manifestFile as string, keyFile as string, testName, slice)
   } else {
     console.log(`Unknown command ${command}`)
     cli.showHelp()
@@ -101,3 +101,7 @@ if (!existsSync(fixtures)) {
     })
   }
 })(cli.argv)
+  .catch(err => {
+    console.log(err)
+    process.exit(1)
+  })
diff --git a/modules/integration-node/src/cli.ts b/modules/integration-node/src/cli.ts
index 2c89de560..0186cb873 100644
--- a/modules/integration-node/src/cli.ts
+++ b/modules/integration-node/src/cli.ts
@@ -64,12 +64,10 @@ const cli = yargs
   /* I set the result to 1 so that if I fall through the exit condition is a failure */
   let result = 1
   if (command === 'decrypt') {
-    const { vectorFile } = argv
-    // @ts-ignore
+    const { vectorFile } = argv as unknown as { vectorFile: string}
     result = await integrationDecryptTestVectors(vectorFile, tolerateFailures, testName)
   } else if (command === 'encrypt') {
-    const { manifestFile, keyFile, decryptOracle } = argv
-    // @ts-ignore
+    const { manifestFile, keyFile, decryptOracle } = argv as unknown as { manifestFile: string, keyFile: string, decryptOracle: string}
     result = await integrationEncryptTestVectors(manifestFile, keyFile, decryptOracle, tolerateFailures, testName)
   } else {
     console.log(`Unknown command ${command}`)
@@ -78,3 +76,7 @@ const cli = yargs
 
   if (result) process.exit(result)
 })(cli.argv)
+  .catch(err => {
+    console.log(err)
+    process.exit(1)
+  })