We want to write a Babel Plugin, which move 'const versionRegex = /(/d+)\.(/d+)\.(/d+)/gi' out of function scope and put it into global scope. Code: function getVersion(versionString) { const versionRegex = /(\d+)\.(\d+)\.(\d+)/gi var x = /foo/.text(…
To write a simple Babel plugin, we can use http://astexplorer.net/ to help us. The plugin we want to write is: var foo = 'o' var bar = 'o' foo === bar function foo(foo, bar) { foo === bar; } We want to trasnform the code which highlighted in foo() fu…
The rule we want to write is show warning if user using console method: // valid foo.console() console() info() console.baz() // invalid console.log() console.info() console.warn() Rule: const disallowedMethods = ["log", "info", "…
What we want to do is checking if user write nested if statements which actually can combine to one: // BAD if (a) { console.log("a"); } else { if (b) { console.log("b"); } } // GOOD if (a) { console.log("a"); } else if (b) {…
For example we have current code: function add(a, b) { console.log(a, b) return a + b } function subtract(a, b) { console.log(a, b) return a - b } add(, ) subtract(, ) console.log('sup dawg') We want to transform the code to: function add(a, b) { con…
