TypeError: Cannot read property 'join' of undefined

[tnguyen14]

I'm getting the following error when using node-sass programmatically:

/path/to/project/node_modules/node-sass/lib/index.js:177
  return options.includePaths.join(path.delimiter);
                             ^

TypeError: Cannot read property 'join' of undefined
    at buildIncludePaths (/path/to/project/node_modules/node-sass/lib/index.js:177:30)
    at getOptions (/path/to/project/node_modules/node-sass/lib/index.js:195:26)
    at Object.module.exports.render (/path/to/project/node_modules/node-sass/lib/index.js:282:17)

I've created a reduced test case as follow:

var sass = require('node-sass');

sass.render('main.scss', function (err, results) {
	if (err) {
		return console.error(err);
	}
	console.log(results.css);
});

with main.scss just contains

body {
	margin: 0;
}

I tried to add some console log to the buildIncludePaths function, and seeing the following output

/**
 * Build an includePaths string
 * from the options.includePaths array and the SASS_PATH environment variable
 *
 * @param {Object} options
 * @api private
 */

function buildIncludePaths(options) {
  console.log(options.includePaths);
  console.log(options.includePaths || []);
  options.includePaths = options.includePaths || [];
  console.log(options.includePaths);

  if (process.env.hasOwnProperty('SASS_PATH')) {
    options.includePaths = options.includePaths.concat(
      process.env.SASS_PATH.split(path.delimiter)
    );
  }

  return options.includePaths.join(path.delimiter);
}

undefined
[]
undefined
/path/to/project/node_modules/node-sass/lib/index.js:177
  return options.includePaths.join(path.delimiter);
                             ^

When reporting an bug, you must provide this information:

• NPM version (npm -v): 3.10.9
• Node version (node -v): v7.1.0
• Node Process (node -p process.versions):

  node: '7.1.0',
  v8: '5.4.500.36',
  uv: '1.10.0',
  zlib: '1.2.8',
  ares: '1.10.1-DEV',
  modules: '51',
  openssl: '1.0.2j',
  icu: '58.1',
  unicode: '9.0',
  cldr: '30.0.2',
  tz: '2016g' }

• Node Platform (node -p process.platform): darwin
• Node architecture (node -p process.arch): x64
• node-sass version (node -p "require('node-sass').info"):

node-sass       3.13.0  (Wrapper)       [JavaScript]
libsass         3.3.6   (Sass Compiler) [C/C++]

• npm node-sass versions (npm ls node-sass): [email protected]

[tnguyen14]

I realized it was because I used the API incorrectly. My apologies.

[tnguyen14]

FWIW, should there be a check somewhere that if the options is not an object, it should fail earlier?