build.mjs reads every binary asset as UTF-8 text before deciding it is not a script #174

Severity: low

Where: build.mjs (spliceAndCopy: const fileText = fs.readFileSync(file, 'utf8'); before the exclude check and the .mjs/.js branch)

What happens

ort-wasm-simd-threaded.wasm, silero_vad_half.onnx, the PNGs and the 3 MB dash.mjs are decoded as UTF-8 into a string that is then discarded, three times per build (three targets in Promise.all). Not a correctness bug (the copy uses copyFileSync), just the single slowest avoidable step of the build.

Suggested fix

Move the readFileSync inside the .mjs/.js branch, after the exclude check.

Confidence: high.

From a line-by-line code review of the tree at 41363fd (2026-10-02). Each claim above was checked against the source before filing; the reproduction steps and line references are as of that commit.

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