Add support for catching errors within main script function

CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.1.0] - 2025-03-12
+
+### Added
+
+- Handled thrown errors within script code. Errors are now caught and returned in the results object.
+
 ## [0.0.4] - 2025-01-13
 
 ### Changed

README.md

@@ -241,6 +241,22 @@ it('logs a message', async () => {
 })
 ```
 
+#### Thrown errors
+
+If your script throws a new error to stop execution, you can catch that error in the results object. The error is stored in the `thrownErrors` property of the results object:
+
+```js
+it('throws an error', async () => {
+  const { thrownError } = await runAirtableScript({
+    script: `
+      throw new Error('This is an error')
+    `,
+    base: testBase,
+  })
+  expect(thrownError.message).toEqual('This is an error')
+})
+```
+
 ## Developing locally
 
 The environment variable `JEST_AIRTABLE_TS_DEV` should be set to `true` so that the `runScript` function pulls the compiled SDK mock from the `./src/environment/sdk/__sdk.js` file. This is already set to `true` in the `package.json` file.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "jest-environment-airtable-script",
-  "version": "0.0.4",
+  "version": "0.1.0",
   "description": "A jest environment for testing Airtable scripts in extensions and automations",
   "license": "Apache-2.0",
   "author": "",

src/environment/run-airtable-script.ts

@@ -29,6 +29,7 @@ type RunScriptResult = {
   output: Output
   mutations: Mutation[]
   console: ConsoleMessage[]
+  thrownError: false | unknown
 }
 
 type RunContext = {
@@ -43,6 +44,7 @@ type RunContext = {
   // eslint-disable-next-line @typescript-eslint/no-unsafe-function-type
   __mockFetch?: Function | false
   __input?: unknown
+  __scriptError: false | unknown
   __defaultDateLocale: DefaultDateLocale
   console: ConsoleAggregator
 }
@@ -80,24 +82,38 @@ const runAirtableScript = async ({
     __mockInput: mockInput,
     __mockFetch: mockFetch,
     __defaultDateLocale: defaultDateLocale,
+    __scriptError: false,
     console: consoleAggregator(),
   }
 
   vm.createContext(context)
   vm.runInContext(sdkScript, context)
-  // We need to run the script in an async function so that we can use await
-  // directly inside the script.
-  vm.runInContext(
-    `;(async () => {
-    ${script}
-  })()`,
-    context
-  )
+
+  let thrownError: false | unknown = false
+
+  try {
+    // We need to run the script in an async function so that we can use await
+    // directly inside the script.
+    await vm.runInContext(
+      `;(async () => {
+      try {
+      ${script}
+      } catch(e) {
+      this.__scriptError = e;
+      }
+    })()`,
+      context
+    )
+    thrownError = context.__scriptError || false
+  } catch (error) {
+    thrownError = error
+  }
 
   return {
     output: (context.__output as Output) || [],
     mutations: context.__mutations || [],
     console: context.console._getMessages(),
+    thrownError,
   }
 }
 export default runAirtableScript

test/catch-errors.test.ts

@@ -0,0 +1,52 @@
+describe('Catch errors test', () => {
+  it('sets thrownError to false if none are thrown', async () => {
+    const randomTable = Math.random().toString(36).substring(7)
+    const results = await runAirtableScript({
+      script: `
+      const table = base.getTable('Table ${randomTable}')
+      output.text(table.id)
+    `,
+      base: {
+        base: {
+          tables: [
+            {
+              id: 'tbl1',
+              name: 'Table 1',
+            },
+            {
+              id: `tbl${randomTable}`,
+              name: `Table ${randomTable}`,
+            },
+          ],
+        },
+      },
+    })
+    expect(results.thrownError).toBe(false)
+  })
+
+  it('catches errors thrown in the script', async () => {
+    const randomTable = Math.random().toString(36).substring(7)
+    const results = await runAirtableScript({
+      script: `
+      const table = base.getTable('Table ${randomTable}')
+      throw new Error('This is an error')
+    `,
+      base: {
+        base: {
+          tables: [
+            {
+              id: 'tbl1',
+              name: 'Table 1',
+            },
+            {
+              id: `tbl${randomTable}`,
+              name: `Table ${randomTable}`,
+            },
+          ],
+        },
+      },
+    })
+
+    expect(results.thrownError.message).toBe('This is an error')
+  })
+})