Fix PackageToJS plugin wasm-opt fallback when output file exists#401
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kateinoigakukun merged 1 commit intomainfrom Aug 9, 2025
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Fix PackageToJS plugin wasm-opt fallback when output file exists#401kateinoigakukun merged 1 commit intomainfrom
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When wasm-opt is not installed, DefaultPackagingSystem falls back to copying the input Wasm file directly to output. However, FileManager.copyItem fails if the destination file already exists, while wasm-opt overwrites existing files. Changes: - Remove existing output file before copying in wasm-opt fallback - Make DefaultPackagingSystem injectable for testing with custom which function - Add focused tests for DefaultPackagingSystem fallback behavior - Test both new and existing output file scenarios Fixes issue where builds fail with 'File exists' error when wasm-opt is unavailable and output file already exists from previous builds.
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Fixes a bug where PackageToJS builds fail when wasm-opt is not installed and the output file already exists.
The plugin falls back to copying the input file when wasm-opt is unavailable, but FileManager.copyItem throws an error if the destination exists. This causes "File exists" build failures.
The fix removes any existing output file before copying, matching wasm-opt's overwrite behavior. Also makes DefaultPackagingSystem injectable for cleaner testing.