fix(@angular/build): prevent incorrect catch binding removal in downleveled for-await #32307
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…eveled for-await When `async-await` is disabled (e.g., in Zone.js applications) and the build target is ES2019 or higher, esbuild may incorrectly remove the catch binding of a downleveled `for await...of` loop during minification. This change explicitly disables the `optional-catch-binding` feature in esbuild when `async-await` support is disabled, forcing esbuild to retain the catch binding and avoiding the minification bug. A new integration test has been added to verify that the catch binding is preserved in the optimized output.
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Jan 16, 2026
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When
async-awaitis disabled (e.g., in Zone.js applications) and the build target is ES2019 or higher, esbuild may incorrectly remove the catch binding of a downleveledfor await...ofloop during minification.This change explicitly disables the
optional-catch-bindingfeature in esbuild whenasync-awaitsupport is disabled, forcing esbuild to retain the catch binding and avoiding the minification bug.Closes #32298