# All files / src/emitter/section types.js

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     // @flow
    import { FUNC, getTypeString } from '../value_type';
    import { varuint32, varint7, varint1 } from '../numbers';
    import OutputStream from '../../utils/output-stream';

    const emitType = (stream, { params, result }, index) => {
      // as of wasm 1.0 spec types are only of from === func
      stream.push(varint7, FUNC, `func type (${index})`);
      stream.push(varuint32, params.length, 'parameter count');
      params.forEach(type => stream.push(varint7, type, 'param'));
      if (result) {
        stream.push(varint1, 1, 'result count');
        stream.push(varint7, result, `result type ${getTypeString(result)}`);
      } else {
        stream.push(varint1, 0, 'result count');
      }
    };

    const emit = (types: any[]) => {
      const stream = new OutputStream();
      stream.push(varuint32, types.length, 'count');

      types.forEach((type, index) => emitType(stream, type, index));

      return stream;
    };

    export default emit;