Port TypeScript#63071: Mark downlevelIteration as removed#2820
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Port TypeScript#63071: Mark downlevelIteration as removed#2820
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Co-authored-by: jakebailey <5341706+jakebailey@users.noreply.github.com>
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[WIP] Add removed diagnostic for downlevelIteration
Port TypeScript#63071: Mark downlevelIteration as removed
Feb 18, 2026
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Ports microsoft/TypeScript#63071. Rather than adding a deprecation diagnostic (TS5101) as in the upstream PR, this adds a "removed" diagnostic consistent with how the Go port handles other removed options.
internal/compiler/program.go: Emit removed-option diagnostic whendownlevelIterationis explicitly set (true or false)internal/testutil/harnessutil/harnessutil.go: Skip submodule tests that setdownlevelIteration💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.