Sample type tests

cmd.js

#!/usr/bin/env node

var fs = require('fs'),
    esprima = require('esprima'),
    estraverse = require('estraverse'),
    doctrine = require('doctrine');

function analyze(node) {
    var comment, data, params, missing;

    comment = node.leadingComments[0];
    if (comment.type !== 'Block') {
        return;
    }
    data = doctrine.parse(comment.value, {unwrap: true});

    data.tags.forEach(function (tag) {
        if (tag.title === 'param') {
            node.body.body.forEach(function(_item) {
                if(_item.expression.type === "AssignmentExpression") {
                    if(tag.name === _item.expression.left.name &&
                        typeof _item.expression.right.value !== tag.type.name.toLowerCase()) {
                        console.error(
                            "Type mismatch: " + _item.expression.left.name,
                            "Expected " + tag.type.name.toLowerCase() + " but got " + typeof _item.expression.right.value
                        );
                    }
                }
            });
        }
    });
}

function verify(node) {
    switch (node.type) {
        case esprima.Syntax.FunctionDeclaration:
            if (node.leadingComments.length === 1) {
                analyze(node);
            }
            break;
        default:
            break;
    }
}

function check(filename) {
    var content, tree;
    try {
        content = fs.readFileSync(filename, 'utf-8');
        tree = esprima.parse(content, { attachComment: true, loc: true });
        estraverse.traverse(tree, { enter: verify });
    } catch (e) {
        console.error(e.toString());
        process.exit(1);
    }
}

if (process.argv.length === 2) {
    console.error('Usage: missing file yo');
    process.exit(1);
}
check(process.argv[2]);

test.js

/** 
 * Test Function
 * @param {String} _arg1
 * @param {Boolean} _arg2
 **/
function test(_arg1, _arg2) {
	_arg1 = false;
	_arg2 = "Now it's a string!  Argh.";
}

test("a string", false, 123);