function alias2pkg( alias ) {
	if ( !isString( alias ) ) {
		throw new TypeError( format( 'invalid argument. Must provide a string. Value: `%s`.', alias ) );
	}
	if ( hasOwnProp( ALIAS_TO_PKG, alias ) ) {
		return ALIAS_TO_PKG[ alias ];
	}
	return null;
}
Returns the package name associated with a specified alias.

@param {string} alias - alias
@throws {TypeError} must provide a string
@returns {(string|null)} package name

@example
var v = alias2pkg( 'base.sin' );
// returns '@stdlib/math/base/special/sin'