$ cat test.js
const ffi = require('node:ffi');

const { functions } = ffi.dlopen('libm.so.6', {
  sinf: { parameters: [ffi.types.FLOAT_32], result: ffi.types.FLOAT_32 },
});

console.log(functions.sinf(1.0));

$ ./node --experimental-ffi test.js
node:ffi:75
    throw error;
    ^

TypeError: Unsupported FFI type: float32
    at Object.dlopen (node:ffi:71:91)
    at Object.<anonymous> (/home/moku/Developments/watilde/node/test.js:3:27)
    at Module._compile (node:internal/modules/cjs/loader:1829:14)
    at Object..js (node:internal/modules/cjs/loader:1969:10)
    at Module.load (node:internal/modules/cjs/loader:1552:32)
    at Module._load (node:internal/modules/cjs/loader:1354:12)
    at wrapModuleLoad (node:internal/modules/cjs/loader:255:19)
    at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:154:5)
    at node:internal/main/run_main_module:33:47 {
  code: 'ERR_INVALID_ARG_VALUE'
}

Node.js v26.0.0-pre

$ ./node --experimental-ffi test.js
0.8414709568023682
(node:721215) ExperimentalWarning: FFI is an experimental feature and might change at any time
(Use `node --trace-warnings ...` to show where the warning was created)