Pre-bundling questions -- qrcode

[anncwb]

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• Read the docs.
• Use Vite >=2.0. (1.x is no longer supported)

Describe the bug

In beta.36, qrcode works normally

<template>
  <div>
    <canvas ref="elRef"></canvas>
  </div>
</template>

<script lang="ts">
  import { defineComponent, ref, nextTick } from 'vue';
  import { toCanvas } from 'qrcode';
  export default defineComponent({
    name: 'App',
    setup() {
      const elRef = ref(null);

      nextTick(() => {
        toCanvas(elRef.value as any, '111');
      });
      return { elRef };
    },
  });
</script>

In beta.50,Console error

TypeError: Cannot read property 'concat' of undefined
    at ReedSolomonEncoder.encode (reed-solomon-encoder.js:38)
    at createCodewords (qrcode.js:340)
    at createData (qrcode.js:286)
    at createSymbol (qrcode.js:424)
    at Object.create (qrcode.js:498)
    at browser.js:53
    at new Promise (<anonymous>)
    at renderCanvas (browser.js:51)
    at App.vue:16

Is this caused by pre-bundling?

Reproduction

• git clone https://github.com/anncwb/vite-bug
• yarn && yarn serve
• View console error
• Down to beta.36, it works normally

System Info

• vite version: bete.50
• Operating System: mac
• Node version: 12
• Package manager (npm/yarn/pnpm) and version:yarn