@shopify/polaris-icons-audit/src/audits/duplicate-content.js

[](https://www.npmjs.com/package/@shopify/polaris-icons-audit)

const crypto = require('crypto');

const tryRequire = require('try-require');
// We need to have React in scope as it is used when we eval the svgr output
// eslint-disable-next-line no-unused-vars
const React = require('react');
const {renderToStaticMarkup} = require('react-dom/server');
const {default: convert} = require('@svgr/core');

// If @shopify/polaris-icons is available to be required, check them too
const polarisIcons = tryRequire('@shopify/polaris-icons') || {};

function audit({filenames, contentPerFilename}) {
  const polarisIconsComponentsPerFilename = Object.entries(polarisIcons).reduce(
    (memo, [importKey, component]) => {
      memo[`@shopify/polaris-icons/${importKey}.svg`] = component;
      return memo;
    },
    {},
  );
  filenames.unshift(...Object.keys(polarisIconsComponentsPerFilename));

  const contentsPerFilename = filenames.map((filename) => {
    const reactComponent = filename.startsWith('@shopify/polaris-icons')
      ? polarisIconsComponentsPerFilename[filename]
      : componentFromSvgFile(filename, contentPerFilename);
    return renderToStaticMarkup(reactComponent());
  });

  const dependentsByHash = filenames.reduce((memo, filename, i) => {
    const fileContents = contentsPerFilename[i];
    const contentHash = md5String(JSON.stringify(fileContents));

    // eslint-disable-next-line no-prototype-builtins
    if (!memo.hasOwnProperty(contentHash)) {
      memo[contentHash] = [];
    }
    memo[contentHash].push(filename);

    return memo;
  }, {});

  const duplicatedDependentsByHash = Object.entries(dependentsByHash).reduce(
    (memo, [filename, dependents]) => {
      if (dependents.length > 1) {
        memo[filename] = dependents;
      }
      return memo;
    },
    {},
  );

  const duplicatedHashesCount = Object.keys(duplicatedDependentsByHash).length;

  return {
    summary: `Found ${duplicatedHashesCount} content hashes shared by multiple files`,
    status: duplicatedHashesCount > 0 ? 'error' : 'pass',
    info: Object.entries(duplicatedDependentsByHash)
      .map(([hash, duplicatedDependents]) => {
        const count = duplicatedDependents.length;

        const filesStr = duplicatedDependents
          .map((file) => `    ${file}`)
          .join('\n');

        return `  ${hash} matches content used in ${count} files:\n${filesStr}`;
      })
      .join('\n'),
  };
}

function md5String(string) {
  return crypto.createHash('md5').update(string).digest('hex');
}

function componentFromSvgFile(filename, contentPerFilename) {
  const source = contentPerFilename[filename];

  const svgrOutput = convert.sync(
    source,
    {
      plugins: ['@svgr/plugin-svgo', '@svgr/plugin-jsx'],
      svgoConfig: {
        plugins: [{removeTitle: true}, {removeViewBox: false}],
      },
      replaceAttrValues: {
        '#5C5F62': '{undefined}',
        '#5c5f62': '{undefined}',
      },
      template: ({template}, opts, {jsx}) => template.ast`(props) => ${jsx}`,
      jsx: {
        babelConfig: {
          plugins: [['@babel/plugin-transform-react-jsx']],
        },
      },
    },
    {
      filePath: filename,
    },
  );

  // eslint-disable-next-line no-eval
  return eval(svgrOutput);
}

audit.auditName = 'duplicate-content';
module.exports = audit;