ionic-framework/core/scripts/api-spec-generator.js

const fs = require('fs');

function apiSpecGenerator(opts) {
  return (docsData) => {
    const content = [];
    docsData.components.forEach(cmp => generateComponent(cmp, content));

    const contentStr = content.join('\n');
    return new Promise(resolve => {
      fs.writeFile(opts.file, contentStr, () => {
        resolve();
      });
    });
  };
}

function generateComponent(component, content) {
  content.push('');
  content.push(component.tag);

  component.props.forEach(prop => {
    content.push(`${component.tag},prop,${prop.name},${prop.type},${prop.default},${prop.required},${prop.reflectToAttr}`);
  });
  component.methods.forEach(prop => {
    content.push(`${component.tag},method,${prop.name},${prop.signature}`);
  });
  component.events.forEach(prop => {
    content.push(`${component.tag},event,${prop.event},${prop.detail},${prop.bubbles}`);
  });
  component.styles.forEach(prop => {
    content.push(`${component.tag},css-prop,${prop.name}`);
  });
}

exports.apiSpecGenerator = apiSpecGenerator;