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babel-plugin-transform-optional-chaining
Advanced tools
Transform optional chaining operators into a series of nil checks
The Optional Chaining Operator allows you to handle properties of deeply nested objects without worrying about undefined intermediate objects.
const obj = {
foo: {
bar: {
baz: 42,
},
},
};
const baz = obj?.foo?.bar?.baz; // 42
const safe = obj?.qux?.baz; // undefined
// Optional chaining and normal chaining can be intermixed
obj?.foo.bar?.baz; // Only access `foo` if `obj` exists, and `baz` if
// `bar` exists
const obj = {
foo: {
bar: {
baz() {
return 42;
},
},
},
};
const baz = obj?.foo?.bar?.baz(); // 42
const safe = obj?.qux?.baz(); // undefined
const safe2 = obj?.foo.bar.qux?.(); // undefined
const willThrow = obj?.foo.bar.qux(); // Error: not a function
// Top function can be called directly, too.
function test() {
return 42;
}
test?.(); // 42
exists?.(); // undefined
const obj = {
foo: {
bar: {
baz: class {
},
},
},
};
const baz = new obj?.foo?.bar?.baz(); // baz instance
const safe = new obj?.qux?.baz(); // undefined
const safe2 = new obj?.foo.bar.qux?.(); // undefined
const willThrow = new obj?.foo.bar.qux(); // Error: not a constructor
// Top classes can be called directly, too.
class Test {
}
new Test?.(); // test instance
new exists?.(); // undefined
npm install --save-dev babel-plugin-transform-optional-chaining
.babelrc
(Recommended).babelrc
{
"plugins": ["transform-optional-chaining"]
}
babel --plugins transform-optional-chaining script.js
require("babel-core").transform("code", {
plugins: ["transform-optional-chaining"]
});
FAQs
Transform optional chaining operators into a series of nil checks
The npm package babel-plugin-transform-optional-chaining receives a total of 3,871 weekly downloads. As such, babel-plugin-transform-optional-chaining popularity was classified as popular.
We found that babel-plugin-transform-optional-chaining demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 6 open source maintainers collaborating on the project.
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