# All files / src/generator typecast.js

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     // @flow
    //
    import mapSyntax from './map-syntax';
    import mergeBlock from './merge-block';
    import { getTypecastOpcode } from '../emitter/opcode';
    import { TYPE_CAST } from '../semantics/metadata';
    import invariant from 'invariant';
    import type { GeneratorType } from './flow/types';

    const generateTypecast: GeneratorType = (node, parent) => {
      const metaTypecast = node.meta[TYPE_CAST];
      invariant(
        metaTypecast,
        `Cannot generate typecast for node: ${JSON.stringify(node)}`
      );

      const { to, from } = metaTypecast;

      const block = node.params.map(mapSyntax(parent)).reduce(mergeBlock, []);
      return [
        ...block,
        {
          kind: getTypecastOpcode(to, from),
          params: [],
        },
      ];
    };

    export default generateTypecast;