packages/okam-build/lib/processor/js/polyfill/helper.js
function shouldPolyfill(importName, name, path) {
    let result;
    if (Array.isArray(importName)) {
        result = importName.some(item => (item === name));
    }
    else {
        result = importName === name;
    }

    // ignore global variable, e.g., Array/Number/Promise etc.
    return result && !path.scope.hasBinding(name, true);
}
function shouldPolyfill(importName, name, path) {
    let result;
    if (Array.isArray(importName)) {
        result = importName.some(item => (item === name));
    }
    else {
        result = importName === name;
    }

    // ignore global variable, e.g., Array/Number/Promise etc.
    return result && !path.scope.hasBinding(name, true);
}
Check given the variable name whether need to polyfill

@inner
@param {string} importName the variable name to polyfill
@param {string} name current variable name
@param {Object} path the node path
@return {boolean}