When deploying a project that uses typescript, but typescript is not a dependency, the default typescript is used. The message that's logged when this happens says:
> Using TypeScript 4.3.4 (no local tsconfig.json)
which is not necessarily true. You can have a `tsconfig.json` file with no typescript dependency.
This message leads to bad debugging paths.
This PR updates the message to be more specific. Now the message will say:
> Using TypeScript 4.3.4 (no local "typescript" package detected)
### Related Issues
Otherwise you are not able to write a serverless function that returns a
Promise when using the ESLint rule
[@typescript-eslint/no-misused-promises](https://typescript-eslint.io/rules/no-misused-promises/)
Following function
```typescript
const handler: VercelApiHandler = async () => {};
```
will report a `Promise-returning function provided to variable where a
void return was expected`
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Fixes error:
```
ENOENT: no such file or directory, open 'querystring'
```
Unfortunately this issue would only manifest when installed externally. I.e. our tests didn't catch this since the `querystring` module is presumably present in the monorepo.
Add strict mode to `vc dev` edge function handlers. This is behind a flag in production, but that flag has been at 100% for a while. So, it seems safe to include it here unconditionally.
Also remove legal comments.
These changes bring `vc dev` edge function support closer to production.
On Windows 10 and 11 machines, environment variables are not case sensitive. The system PATH is actually defined as `process.env.Path`, however Node.js kindly handles the case sensitivity and will automatically return the system path when specifying `process.env.PATH`.
When we clone the environment variables via `{ ...process.env }`, we lose the automatic resolving of `Path` to `PATH`. To fix this, we need to explicitly copy the `PATH`.
#### Tests
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When running `vc dev` for a project using `experimental-edge` runtime and a fetch-related error occurs, the message is a little vague:
```
Unhandled rejection: fetch failed
```
In this case, the fetch promise (defined in @edge-runtime/primitives) is being rejected with a `TypeError: fetch failed` that has a `cause` property containing the actual `response.error` message. The `response.error` is the actual error and is never reported to the user.
This PR simply appends the `cause` message, if exists, to the fetch failure message.
```
Unhandled rejection: fetch failed: Error: getaddrinfo ENOTFOUND undefined
```
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#### Tests
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This was broken since https://github.com/vercel/vercel/pull/8242, which accidentally pushed all WebAssembly modules to be nested under `global.wasmBindings` instead of being directly under the global scope.
### Related Issues
- This was broken since https://github.com/vercel/vercel/pull/8242
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This PR consolidates all the `test` scripts to be the same and removes the `prepublishOnly` script since we always run `build` before publishing to npm.
Middleware server setup wasn't logging errors the same way that dev server setup was. This meant that middleware instantiation errors (like invalid config) would cause requests to 500, but no errors to be logged to the console.
This PR updates the invalid config error, makes sure errors in this area are logged out, and adds a test for this behavior.
**It may be appropriate to fail the deploy (and crash `vc dev`) in this case instead, though. What do others think?**
---
During `vc dev` with middleware that has an invalid `config.matcher` value...
Before: You see a 500 response in the browser and no output in the terminal.
After: You see a 500 response in the browser and this output in the terminal:
```
Error! Middleware's `config.matcher` values must start with "/". Received: not-a-valid-matcher
```
---
Related Issue: https://github.com/vercel/edge-functions/issues/220
* update edge-runtime to allow `instanceof` to work with primitives
* finishin upgrading edge-runtime
* update to latest
* fix merge
* remove dev only from test
