Utilize zokrates-js/node build variant

[dumivo]

Co-authored-by: myronrotter myronrotter01@t-online.de

Description

Usage of the privacy package @baseline-protocol/privacy for Node.js applications fails due to the fact that zokrates-js uses the bundler variant leveraging ES2016 features by default.

Related Issue

#224

Motivation and Context

One acceptance criteria of #224 consists of refactoring the existing the codebase to import and use @baseline-protocol/privacy.
However, importing mentioned package fails with the error

import wrapper from './wrapper.js';
       ^^^^^^^

SyntaxError: Unexpected identifier
    at Module._compile (internal/modules/cjs/loader.js:723:23)
    at Module._compile (/home/minh/baseline/examples/radish34/zkp/node_modules/pirates/lib/index.js:99:24)
    at Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Object.newLoader [as .js] (/home/minh/baseline/examples/radish34/zkp/node_modules/pirates/lib/index.js:104:7)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (internal/modules/cjs/helpers.js:25:18)
    at Object.<anonymous> (/home/minh/baseline/examples/radish34/zkp/node_modules/@baseline-protocol/privacy/src/zkp/zokrates.ts:1:1)

When refactoring the privacy package to use zokrates-js/node instead of zokrates-js, this error gets resolved. This variant uses require instead of import in the entrypoint, making zokrates-js/node a valid CommonJS package. See https://zokrates.github.io/toolbox/zokrates_js.html#importing for more information.

Result

Node.js applications should now be able to use @baseline-protocol/privacy out-of-the-box without adding a transpilation step like Typescript or Babel, including the radish34 demo project.

How Has This Been Tested

The following steps were made:

• passing all tests using npm test in the privacy package
• running npm run build successfully
• importing the privacy package locally in a Node.js project is successful

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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