grind-framework/lib/Errors/MissingPackageError.js

An opinionated Node web framework built on Express

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.MissingPackageError = void 0;

function _isnil(val) { return val === null || typeof val === 'undefined'; }

const fs = require('fs');

const path = require('path');

let hasCheckedForYarn = false;
let hasYarn = false;

class MissingPackageError extends Error {
  constructor(pkg, type = null, why = null) {
    if (!hasCheckedForYarn) {
      hasCheckedForYarn = true;

      try {
        // eslint-disable-next-line no-sync
        fs.accessSync(path.join(process.env.BASE_PATH || process.cwd(), 'yarn.lock'), 'R_OK');
        hasYarn = true;
      } catch (err) {
        hasYarn = false;
      }
    }

    let command = null;

    if (hasYarn) {
      if (_isnil(type)) {
        type = '';
      } else {
        type = ` --${type}`;
      }

      command = `yarn add${type} ${pkg}`;
    } else {
      if (_isnil(type)) {
        type = '';
      } else {
        type = `-${type}`;
      }

      command = `npm install --save${type} ${pkg}`;
    }

    let message = `${pkg} missing, please run \`${command}\``;

    if (typeof why === 'string') {
      message += `: ${why}`;
    }

    super(message);
    this.name = this.constructor.name;
  }

}

exports.MissingPackageError = MissingPackageError;
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