Script used to compare acorn.parse on source vs JSON.parse on existing ASTs

ast-comparison.js

const fs = require('fs');
const glob = require('glob');
const acorn = require('acorn-dynamic-import').default;


const sourceFiles = glob.sync('../location/*.source.json');
const astFiles = glob.sync('../location/*.ast.json');

const filesToParse = sourceFiles.map(fileLocation => {
  return JSON.parse(fs.readFileSync(fileLocation, 'utf8'));
});


console.log('found', filesToParse.length, ' source files to parse');
console.time('parsing all the files');
filesToParse.forEach((thing) => {
  acorn.parse(thing.source, thing.parseOptions);
});
console.timeEnd('parsing all the files');


const astContents = astFiles.map((astFileLocation) => {
  return fs.readFileSync(astFileLocation, 'utf8');
});

console.log('found', astContents.length, ' ast files to parse');
console.time('json parsing asts');
astContents.forEach((astString) => {
  return JSON.parse(astString);
});
console.timeEnd('json parsing asts');