# All files / src/emitter preamble.js

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     // @flow
    import { u32 } from "wasm-types";
    import OutputStream from "../utils/output-stream";

    export const VERSION_1 = 0x1;
    export const MAGIC = 0x6d736100;
    export const MAGIC_INDEX = 0;
    export const VERSION_INDEX = 4;

    export default function write(version: number) {
      return new OutputStream()
        .push(u32, MAGIC, "\\0asm")
        .push(u32, version, `version ${version}`);
    }