hook up logging to wasm, example uses new zig-js package

src/main_wasm.zig

@@ -1,6 +1,17 @@
 // This is the main file for the WASM module. The WASM module has to
 // export a C ABI compatible API.
+const std = @import("std");
+const builtin = @import("builtin");
 
 pub usingnamespace @import("os/wasm.zig");
 pub usingnamespace @import("os/wasm/log.zig");
 pub usingnamespace @import("font/main.zig");
+
+// Set our log level. We try to get as much logging as possible but in
+// ReleaseSmall mode where we're optimizing for space, we elevate the
+// log level.
+pub const log_level: std.log.Level = switch (builtin.mode) {
+    .Debug => .debug,
+    .ReleaseSmall => .warn,
+    else => .info,
+};