Couldn't use lodash within interpreter

[mikekotikov]

Hi. Came upon a problem with using lodash within the interpreter. Here is a sample of what I'm trying to do:

const Interpreter = require('js-interpreter');
const lodash = require('lodash');

const func = ' var result = (function() { return _.reverse([1, 2, 3]); })()';
const interpreterInitFunc = function(interpreter, globalObject) {
    const pseudoLodash = interpreter.nativeToPseudo(lodash);

    interpreter.setProperty(globalObject, '_', pseudoLodash);
    interpreter.setProperty(globalObject, 'result', null);
};

const interpreter = new Interpreter(func, interpreterInitFunc);

interpreter.run();

const res = interpreter.getProperty(interpreter.globalObject, 'result');

console.log('res:', res);

And I'm getting this error:

TypeError: undefined is not a function at Interpreter../original-repo/interpreter.js.Interpreter.unwind (/mnt/c/Users/mikhail.kotsikau/Projects/test/js-interpreter-lodash/node_modules/js-interpreter/lib/js-interpreter.js:4839:17) at Interpreter../original-repo/interpreter.js.Interpreter.throwException (/mnt/c/Users/mikhail.kotsikau/Projects/test/js-interpreter-lodash/node_modules/js-interpreter/lib/js-interpreter.js:4771:8) at Interpreter../original-repo/interpreter.js.Interpreter.stepCallExpression (/mnt/c/Users/mikhail.kotsikau/Projects/test/js-interpreter-lodash/node_modules/js-interpreter/lib/js-interpreter.js:5270:12) at Interpreter../original-repo/interpreter.js.Interpreter.step (/mnt/c/Users/mikhail.kotsikau/Projects/test/js-interpreter-lodash/node_modules/js-interpreter/lib/js-interpreter.js:2362:48) at Interpreter../original-repo/interpreter.js.Interpreter.run (/mnt/c/Users/mikhail.kotsikau/Projects/test/js-interpreter-lodash/node_modules/js-interpreter/lib/js-interpreter.js:2392:32) at Object.<anonymous> (/mnt/c/Users/mikhail.kotsikau/Projects/test/js-interpreter-lodash/app.js:18:13) at Module._compile (internal/modules/cjs/loader.js:1138:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1158:10) at Module.load (internal/modules/cjs/loader.js:986:32) at Function.Module._load (internal/modules/cjs/loader.js:879:14)

I also tried calling createNativeFunction on lodash or assigning it to scope using setValueToScope, but still got errors. Am I doing something wrong? If not, is there some workaround for such case?

Thanks in advance!

[Webifi]

To include a library in the interpreter, you'll need append the raw (must be ES5) JS for it. (You could use https://www.npmjs.com/package/raw-loader for that.)

import rawLibraryScript from '!!raw-loader!../path/to/my/library.js'

const interpreter = new Interpreter('')
interpreter.appendCode(rawLibraryScript )
interpreter.run()

That said, lodash may need some things that the interpreter doesn't have out of the box.

[mikekotikov]

@Webifi thanks! Found another solution that worked: casted lodash to object.