test(bundler): comprehensive TOML testing

[DonIsaac]

What does this PR do?

Runs our transpiler and module loader against all cases from toml-lang/toml-test. Results are saved into a snapshot, since not all tests pass. As we make fixes, we can use the -u flag to update them. This also prevents accidental regressions in TOML parsing.

This is still a draft because some WebKit assertions are failing in import cases. I'll either skip those for now or fix them in this PR.

I plan on fixing bugs found by these tests in the near future.

Related issues:

• Bun.plugin segfault #16671

How did you verify your code works?

Lots and lots of tests

[robobun]

^{Updated 5:37 PM PT - Mar 6th, 2025}

❌ @DonIsaac, your commit b4950b1 has 1 failures in Build #12780:

• test/integration/source-types/toml.test.ts - 2 failing on 🪟 2019 x64
• test/integration/source-types/toml.test.ts - 2 failing on 🪟 2019 x64-baseline
• test/integration/source-types/toml.test.ts - 2 failing on 🐧 3.20 aarch64
• test/integration/source-types/toml.test.ts - 2 failing on 🐧 3.20 x64
• test/integration/source-types/toml.test.ts - 2 failing on 🐧 3.20 x64-baseline
• test/integration/source-types/toml.test.ts - 2 failing on 🐧 22.04 aarch64
• test/integration/source-types/toml.test.ts - 2 failing on 🐧 24.04 aarch64
• test/integration/source-types/toml.test.ts - 2 failing on 🐧 20.04 aarch64
• test/integration/source-types/toml.test.ts - 2 failing on 🐧 12 aarch64
• test/integration/source-types/toml.test.ts - 2 failing on 🐧 24.04 x64-baseline
• test/integration/source-types/toml.test.ts - 2 failing on 🐧 22.04 x64-baseline
• test/integration/source-types/toml.test.ts - 2 failing on 🐧 20.04 x64-baseline
• test/integration/source-types/toml.test.ts - 2 failing on 🐧 12 x64-baseline
• test/integration/source-types/toml.test.ts - 2 failing on 🐧 24.04 x64
• test/integration/source-types/toml.test.ts - 2 failing on 🐧 22.04 x64
• test/integration/source-types/toml.test.ts - 2 failing on 🐧 12 x64
• test/integration/source-types/toml.test.ts - 2 failing on 🐧 20.04 x64

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🧪   try this PR locally:

bunx bun-pr 17886