const input = ``;

const out = babel.transformSync(input, {
  configFile: false,
  plugins: [
    function() {
      return {
        visitor: {
          Program(path) {
            try {
              path.pushContainer("body", this.addHelper("fooBar"));
            } catch {}
            path.pushContainer("body", this.addHelper("fooBar"));
          },
        },
      };
    },
  ],
});

console.log(out.code);

_fooBar