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feat(js): add exact u32 conversion #71

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Merged
spiral-ladder merged 1 commit into from
Aug 4, 2026
Merged

feat(js): add exact u32 conversion #71

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17 changes: 17 additions & 0 deletions src/js/number.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,23 @@ pub const Number = struct {
return self.val.getValueUint32();
}

/// Attempts to convert the JavaScript number to a `u32` without coercion.
///
/// Returns `error.InvalidUnsignedInteger` if the number is negative,
/// fractional, non-finite, or greater than `std.math.maxInt(u32)`.
pub fn toU32Exact(self: Number) !u32 {
const max: f64 = @floatFromInt(std.math.maxInt(u32));
const value = try self.toF64();
if (!std.math.isFinite(value) or
value < 0 or
value > max or
@trunc(value) != value)
{
return error.InvalidUnsignedInteger;
}
return @intFromFloat(value);
}

/// Attempts to convert the JavaScript number to a Zig `f64`.
///
/// This conversion is generally lossless for most JS numbers, which are typically `f64`.
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