Description

• Follow up fix(vitest): handle single await vi.hoisted #4962

Since the regex change introduced in the above PR, certain source code with a huge inline source map leads to freeze main vitest process for expensive regexpHoistable.test(code) quite a long time. (See comment in #4855 (comment))

I'm not really familiar with estimating regex perf, but the arbitrary whitespace prefix [ \t]* seems to be bad and it's probably redundant since \b already asserts word boundary.

To reproduce this, build vitest itself with pnpm dev (which adds inline sourcemap), then run:

pnpm -C test/browser test-fixtures run

(... it gets stuck for a while since expensive regex test takes over main thread. waiting for a while to see...)

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Vitest caught 1 unhandled error during the test run.
This might cause false positive tests. Resolve unhandled errors to make sure your tests are not affected.

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Error: [birpc] timeout on calling "getFiles"
 ❯ ../../../../../../../../../__vitest__/assets/index-0EYobN63.js:5:60901

This error originated in "basic.test.ts" test file. It doesn't mean the error was thrown inside the file itself, but while it was running.
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It's also odd that Vitest's own file such as packages/vitest/dist/vendor/vi.smj1Ggd4.js goes through these transform, but I suppose that's a different issue with externalization during local dev.

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