21 lines
438 B
JavaScript
21 lines
438 B
JavaScript
import { types as t } from "@babel/core";
|
|
|
|
export default function() {
|
|
return {
|
|
visitor: {
|
|
Program(path) {
|
|
const { node } = path;
|
|
|
|
for (const directive of (node.directives: Array<Object>)) {
|
|
if (directive.value.value === "use strict") return;
|
|
}
|
|
|
|
path.unshiftContainer(
|
|
"directives",
|
|
t.directive(t.directiveLiteral("use strict")),
|
|
);
|
|
},
|
|
},
|
|
};
|
|
}
|