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27 lines
876 B
27 lines
876 B
function monkeyPatch(name, parentObj, patches) {
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const injId = Math.random().toString(36).slice(2).toUpperCase()
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const before = (patches["before"] === undefined) ? (...args)=>args : patches["before"];
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const instead = (patches["instead"] === undefined) ? (...args)=>args : patches["instead"];
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const after = (patches["after"] === undefined) ? (args, res)=>res : patches["after"];
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const handler = {
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apply: (target, thisArg, args) => {
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before(args);
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res = (patches["instead"] === undefined) ? target(...args) : instead(...args);
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return after(...args, res);
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}
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};
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const prox = new Proxy(parentObj[name], handler);
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const orig = parentObj[name];
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parentObj[name] = prox;
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const unpatch = () => {
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parentObj[name] = orig;
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}
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parentObj[injId] = {
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name: name,
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orig: orig,
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unpatch: unpatch
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};
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return unpatch;
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}
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module.exports = monkeyPatch
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