/babel-plugin-transform-binary-operator

Primary LanguageJavaScript

babel-plugin-transform-binary-operator

This repo was made strictly for educational purposes

This plugin (see plugin.js) allows you to transform abstract equality comparison (==) to strict eqaulity comparison (===) and vice-versa

Configuration

In your .babelrc add the plugin plugin.js to your array of plugins. This plugin has two options available, twoToThree which will convert all abstract equality comparisons (==) to strict equality comparisons (===) and threeToTwo, which will go in the other direction (strict to abstract). You must specify one of the two options to be true, otherwise nothing happens.

 {
  "plugins": [
    ["./plugin.js", {
      "twoToThree": true,
      "threeToTwo": false
    }]
  ]
}

Examples

You can see what happens when you run babel with this plugin by looking at both the test.js file and the compiled.js file. test.js contains the comparisons prior to transformation and compiled.js has them after. In this case the twoToThree option was turned on.

test.js

// binary expressions with ==
"a" == "a"
"b" == "a"
1 == 2
3 == 3

// binary expressions with ===
"a" === "a"
"b" === "a"
1 === 2
3 === 3

compiled.js

// binary expressions with ==
"a" === "a";
"b" === "a";
1 === 2;
3 === 3;

// binary expressions with ===
"a" === "a";
"b" === "a";
1 === 2;
3 === 3;

As you can see all of the abstract eqaulity operators were replaced by strict equality operators.

Why?

This was made so that I could better understand babel/babel plugins and learn enough to make more useful plugins.